ML20136H197

Maint Procedure MP 1411.05, Maint & Repair of Limitorque Valve Operators Types SMB-0 Through SMB-4

ML20136H197
Person / Time
Site:	Davis Besse
Issue date:	08/20/1985
From:	Daft C, Quennoz S, Shawn Smith TOLEDO EDISON CO.
To:
Shared Package
ML20136H086	List: ML20136H080 ML20136H095 ML20136H110 ML20136H119 ML20136H128 ML20136H143 ML20136H156 ML20136H177 ML20136H197 ML20136H214 ML20136H237 ML20136H251 ML20136H277 ML20136H283
References
MP-1411.05, NUDOCS 8601090304
Download: ML20136H197 (57)

Text

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MP 1411.05 s t Davis-Besse Nuclear Power Station thit No.1 Maintenance Procedure be 1411.05 Maintenance and aspair of Limitoy. Valve Operstcr Types SM-0 tiroupt SM-4 Record of Aw.wal and Changes i

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1. PURPOSE 1.1 This procedure provides instruction for maintenance to be performed on Limitorque operators models SMB-0 through SMB-4.

1.2 Due to the complexity and various configurations of these operators, this procedure has been divided into phases. This will allow the flexibility to choose the maintenance required ,

for a specific operator. '

1.3 Procedural Phases:

6.1 Disconnect electrical power leads.

6.2 Limitorque valve operator removal from HBC gear box.

6.3 Limitorque valve operator removal from valve flange with l stem nut installed.

6.4 Limitorque valve operator removal from valve flange with stem nut removed.

6.5 Limitorque valve operator removal from valve flange when operator cannot be placed in manual.

6.6 Limitorque valve operator disassembly.

! 6.7 Cleaning, inspection, and repair.

6.3 Limitorque valve opera. tor reassembly.

6.9 Limitorque valve operator subassemblies (disassembly and reassembly).

, 6.9.5 & 6.9.6 Drive sleeve -

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{ 6.9.9 & 6.9.10 Worm / torque spring (spring pack) 6.10 Limitorque valve operator installation on ESC gear box. <

6.11 Limitorque valve operator installation on valve with stem aut installed.

6.12 Limitorque valve operator installation on valve with stem nut removed.

6.13 Lubrication  !

6.14 Limit switch adjustment..

6.15 Torque Switch Setting 6.16 Setting position limit stops 303C through ISBC units.

6.17 Inergisation and check out 'of Limitorque operators follow-ing asiatenance, repair, or new installation.

6.13 Inspection and testing.

1.4 Not all portions of this procedure will be applicable for every maintenance condittoa. Inter the symbol "NA" in the applicable i blanks on the data and sigaoff sheet as required. This is also appropriate when only portions of this procedure are being conducted.

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2. REFERENCES 2.1 Maintenance Procedure MP 1410.32 Testing of Motor Operated Valves using MOVATS 2.2 Limitorque Corporation I Limitorque, Bulletin SMBI-82C, Type SMB Instruction and Mainte-nance Manual Limitorque, Bulletin f!?l, Type SMB Valve Controls '

Limit.arque, Bulletin 15-73, Manual Type HBC Limitorque, Bulletin HBCI-85, Type HBC Instruction and Mainte-nance Manual 2.3 Drawings -

2.3.1 Limitorque Corporation 01-408-0011-4, Parts List Drawing Medcl SMS-0 thrcush SMB-4 .

01-404-0073-4, Parts List Drawing Model SMB-0 through SMB-4 '

01-408-0074-4, Parts List Drawing Model SMB-0 through 1

SMB-4

3. SPECIAL EQUIPHIFF -_- -v -- _i MP 1410.33, Megger Testing of Electrical Equipment MP 1410.63, Electrical Maintenance Guidelines Gasket material - Anchorite #425 or equivalent 3/8" bolt 2 " - 3" long U aut Grease - Ezzon nebula EP-1 l Lubricant - Holykote "G", Neolube or equivalent l Ammeter, clamp on Voltage Tester ,

Wrench, locknut '

Retaining Ring (snap ring) pliers (inside & outside)

Dead aan switch

4. PRECAUTIONS AMD LIMITATIONS i

4.1 Safety Tagging Procedure, AD 1803.00, will be in effect and l followed throughout this procedure.

4.2 TED Safety Procedures will be in effect and followed throughout this procedure.

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3 MP 1411.05.0 4.3 Cleanliness Control Procedure AD 1844.05 will be in effect and followed throughout this procedure.

4.4 Jumper and lifted Wire Control Procedure AD 1823.00 will be in effect and followed throughout this procedure.

I 4.5 Torque switches have different colors. The application in use l depends on the color. They are as follows:

1 White: Nuclear Safety Related or For Use Inside and outside Containment Brown: For Use on All Class IE Equipment.

Red: Nuclear Safety Related NOT for Containment Use 4.6 All leads will be bundled before closing limit switch cover to i

prevent crushing or broken leads.

4.7 Observe proper radiation practices to limit personnel exposure, ALARA.

4.8 The following actions can damage the operator:

Lifting the operator by the handwheel,

( Forcing the operator by the handwheel, Forcing the declutch lever, I Using a cheater (mechanical leverage) on handwheel.

Lifting the operator by or laying the operators weight on the declutch lever.

4.9 AD 1844.06, Control of Lifting and Bandling Equipment, will be used when moving operators.

l 4.10 The Limitorque operator has more than one source of power.

4.11 Do not stop valve stem travel by depressing declutch lever

{ daring motor operation.

I 4.12 Do not jos motor in an effort to obtain a tighter seated valve.

4.13 Do not reset torque switch setting higher than the nazimum that is recommended by the valve manufacturer, without engineering approval.

4.14 Do not attempt to set limit switches without first disconnecting control and power circuits unless insulated tools and extreme caution is used.

4.15 Protect inside of limit switch compartment from exposure to

( water or steam.

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s 4 MP 1411.05.0 4.16 If you must " motor operate" valve without first setting limit switch, a " dead aan" switch and extreme caution must be used.

4.17 Engineering evaluation is required prior to performing the torque switch adjustment if the torque switch settings are not stamped inside the limit switch compartment.

4.18 The limit switch will not deenergize the motor in the valve

" closed" direction on torqued closed valves. Deenergize motor if torque switch failure occurs.

4.19 Do not bypass or render inoperative any of the personnel safety or equipment protection devices.

4.20 Incompatible gresses may cause gresses to solidify, liquify or produce toxic gases. Only the greases specified in this proce-dure are to be used.

4.21 When replacing the covers on the geared limit switch, ensure the contact block is seated correctly on the frame.

4.22 For Environmentally Qualified (EQ) cparators, ensure gaskets are intact, all cover bolts installed, all pipe plugs installed, T-drains installed in motors where required and conduit fittings reassembled.

5. PREREQUISITES 5.1 The equipment or device has been isolated and/or deenergized prior to working on Limitorque unit.

5.2 Safety Red Tags have been issued and hung.

5.3 A Maintenance Work Order has been issued for repairs.

5.4 A REP has been issued if required.

' 5.5 Tags for the lifted wires, mechanical modifications and jumpers have been issued and are ready to be attached.

5.6 Record general information on the data package prior to starting work.

5.7 Match mark operator to valve to ensure proper reinstallation.

6. PROCEDURE 6.1 Disconnect electrical power leads.

6.1.1 Shut off all power to Limitorque unit, and hang Safety l

Red Tags.

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6.1.2 Disconnect computer points and hang tags if applicable.

6.1.3 Remove the limit switch compartment cover.

6.1.4 Disconnect the leads to the terminal block.

6.1.5 Disconnect the motor leads inside of the limit switch compartment.

6.1.6 Pull electrical cable from limit switch compartment and attach jumper and lif ted wire tags. Make sure leads are properly marked for reconnecting to the terminals.

NOTE: These steps are required to provide a reference point to allow setting limit

• switches using information provided by the NOVATS Test Procedure, Ref. 2.1.

6.1.7 Coordinate with operations, and by engaging the manual handwheel, position the valve to either the full open or full closed position. Record the valve position on the data sheet under limit switch data.

(- 6.1.8 Turn the set rod (s) clockwise until it (th y) stop.

DO NOT FORCEI (Refer to Figure (11).

6.1.9 Reinstall the limit switch compartment cover.

NOTE: Review and/or refer to the parts drawing for j

reference as listed in 2.3.1 for this unit

' whenever disassembly is to be made. Be certain to keep all parts clean and free from dirt when disassembly is made.

NOTE: If Limitorque valve operator is installed with a IBC gear box, perform Step 6.2.

Begin at Procedure Step 6.3 or 6.4 if no BBC gear boa is installed, or if the operator is attached to a non-rising stem valve, or a rising stem valve where the valve yoke bushing causes the stem to rise instead of a threaded stem nut in the operator. In this case, remove any locking devices on the end of the stem. These locking devices (usually a nut and washer), lock the stem. to the stem nut. Perform Steps 6.4.11 through

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6.4.12 to remove this operator from its valve.

s. , NOTE: Steps 6.'2, 6.3, or 6.4 (actuator removal) need not be performed if valve operator is

4 6 MP 1411.05.0 to be worked in place. If the operator is to be worked in place, remove the stem nut, Steps 6.4.1 through 6.4.10, then proceed to Step 6.6 or proceed directly to Step 6.6 without removing the stem nut and use the lock nut removal tool to unscrew the drive  ;

sleeve from the stem in Step 6.6.5.4. .

6.2 Limitorque valve operator removal form HBC Gear Box.

CAUTION: Do not use Limitorque valve operator handwheel as a

lifting point.

CAUTION: Prior to proceeding, ensure that the valve is not hard seated, either open or shut. Coordinate with opera-tions and engage the manual handwheel and operate the valve several turns opposite of valve position.

6.2.1 Attach the liftius device to Limitorque valve operator and take up slack.

6.2.2 Remove bolta holding actuator to gear box.

6.2.3 Carefully pull operator away from gear box and off of splined shaft of HBC gear box.

6.2.4 Transpo.et valve operator to designated work area.

NOTE: Performance of Procedure Steps 6.3 and 6.4 requires the Limitorque operator to be placed in manual. If the operator cannot be placed in manual, proceed to Procedure Step 6.5.

NOTE: Procedure Step 6.3 removes the valve opera-tor from the valve flange without removing

, the stem nut from the operator. Procedure Step 6.4 removes the stes nut from the operator prior to removing the operator from the valve flange. Either Step 6.3 or 6.4 may be used.

l 6.3 Limitorque valve operator removal from valve flange with stem nut installed.

6.3.1 Remove flange bolts holding valve mounting flange to 4,

valve operator.

6.3.2 Attach suitable rigging or lifting device to valve operator and take up slack in rigging. l 6.3.3 Depress declutch lever and place operator in manual.

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1 7 MP 1411.05.0 6.3.4 Slowly rotate handwheel in closed direction maintain-ing tension with rigging equipment.

6.3.5 Continue rotating handwheel in closed direction while lifting an operator until is clear of threaded valve stem. .

6.3.6 Transport valve operator to designated work area.

6.4 Limitorque valve operator removal from valve flange with stem nut removed.

6.4.1 Unscrew the stem protector pipe or cap from the handwheel assembly.

NOTE:

If the threads above the lock nut have been staked, follow Steps 6.4.2 through 6.4.7.

If they have not been staked, so to Step 5.

6.4.2 Stuff a rag or paper towel into the lock ni.t opening.

6.4.3 Drill out the staked threads above the lock nut.

6.4.4 Clean out the metal particles.

6.4.5 Use the lock nut removal tool to loosen and remove the lock nut.

6.4.6 Push the declutch lever down and turn the handwheel in the "CLOSE" direction.

6.4.7 Observe that the stem nut is rising out of the housing as the handwheel ,is turned.

6.4.8 Stop turnina the handwheel when the stem nut no longer rises.

6.4.9 Use a scribe or pin to unscrew the remaining length of the stem nut.

6.4.10 Remove the stem nut.

6.4.11 Remove flange bolts holding mounting flange to valve operator.

6.4.12 Attach suitable rigging or lifting device to valve operator and take up slack in rigging.

6.4.13 Carefully lift actuator free of valve and transport to designated work area.

8 MP 1411.05.0 6.5 Limitorque valve operator removal from valve flange when opera-tor cannot be placed in manual.

NOTE: Partial disassembly may allow return to manual opera-tion. However, if manual operation is not possible i

the following steps will provide one method for removal from the valve flange.

6.5.1 Remove the following components using the notad procedure steps.'

Torque switch para. 6.6.1.

Handwheel para. 6.6.6.

Declutch lever para. 6.6.6.

i Motor - para. 6.6.2.

Spring pack / worn assy. para. 6.6.8.

6.5.2 Remove bolts or caps screws from housing cover and remove housing cover.

NOTE: Retain housing gasket for reuse or obtain thickness measurement to obtain proper .

replacement gasket.

6.5.3 Using the lock nut removal tool unscrew the drive sleeve from the valve steam.

6.5.4 Attach lifting device to actuator and remove slack.

CAUTION: Do not use handwheel as lift point.

6.5.5 Unholt operator from valve mounting flange and put bolts in plastic bag.

6.5.6 Lift operator housing from valve stem.

t 6.5.7 Install thread protector on valve stem.

6.6 Limitorque Valve Operator Disassembly 6.6.1 Limit Switch and Torque Switch Removal i

1. Unbolt and remove limit switch compartment cover (if installed).

2. Disconnect and remove geared limit switch assembly.

3. Disconnect and remove torque switch assembly.

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4. Remove the terminal strip (s) and other electrical parts that may be installed in the compartment.

5.

Remove the local mechanical indicator (if installed).

6.6.2 Drive Motor Removal 1.

Ensure that electrical motor leads are disconnected. l

2. Remove bolts and drive motor and pull motor leada from limit switch compartment.

3. Remove gasket.

6.6.3 Motor Pinion Removal (remove only if worn or damaged)

CAUTION: SMB-0 operators have a different pinion i

arrangement than SMB-1 through SMB-4 opera-tors . Ensure the pinion is not installed backwards. (Refer to Figure 2)

1. Cut and remove lock wire.

2. I$osensetscrew.

CAUTION: If on SMB-4 valve operators the motor pinion gear key shows signs of damage or deforma-tion, replace the key with a key made from type 4140 steel.

3. Remove pinion and key.

6.6.4 Clutch Housing Removal

l. Remove retaining ring and split ring retainer.

, 2. Remove split ring by pushing against the worm shaft clutch gear to compress the fork return

, spring allowing the split ring segments to fall from the worm shaft.

3. Remove worm shaft clutch gear. Spacer may come out with the worm shaft clutch gear. (SMB-0 &

SMB-1 Only)

NOTE: Some operators have a declutch shaft extension passing loosely through the clutch housing. This extension should be removed by pulling from the motor and prior to removing the clutch o

10 MP 1411.05.0 housing to ensure it doesn't fall out during removal of the housing and become lost.

4.. Remove capscrews. Remove clutch housing by '

lifting while pulling the housing away from the main housing. .This will allow the clutch fork (part of the clutch housing) to disengage from the worm shaft clutch.

5. Remove spacer (for SMB/SB-0 and 1 only), remove the worm shaft clutch, and the clutch fork return spring from the worn shaft.

6.6.5 ' Trippers Removal, Inspection and Reinstallation (see Figure 3)

1. Remove tripper spring.

NOTE: If off-centered came are installed in the trippers, match mark the came and trippers to allow proper reinstallation.

2. Remove capscrews and trippers. Ensure that off-centered' cams (if installed) do not fall from the fingers during removal. '

3. After inspecting for defects, reinstall the tripper fingers. If off-centered came are installed'use the match marks to install as originally found. Replace tripper fingers in same location as they were prior to removal.

NOTE: The inside land of one finger must be l 1/8" higher than the other by using the i off-centered can or grinding / filing the land higher if off-centered cams are not installed.

6.6.6 Hand Wheel Drive Assembly and Declutch Shaft Assembly Removal (Refer to Figures 4 & 5)

1. Remove any retaining rings that may exist in front of the declutch link, then slide declutch

, link off splined declutch shaft.

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2. Remove any retaining rings that may exist between  !

the declutch link and the housing.

3. Loosen handwheel setscrew and remove handwheel and key.

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11 MP 1411.05.0 l 4.

Loosen declutch lever setscrew and remove declutch lever and key.

5. Remove bolts and the spring cartridge cap.

NOTE: End Cap is rotationally spring loaded. A loud snap might be heard on removal of the end cap. Do not be alarmed, as this is the torsion spring being released.

6. Inspect the spring cartridge cap to ensure the spring pin for the torsion spring is not damaged.

This spring pin should be sticking out of the inside of the end cap in the declutch shaft area.

On SMB-3 and SMB-4, inspect handwheel shaft needle bearings and oil seal.

7. Remove declutch shaft from the lever and of unit.

Remove "0" ring from the declutch shaft.

8. Remove torsion spring from housing. Inspect the torsion spring and hcusing cavity for defects.

9. Remove the elastic stop nut from the handwheel shaft.

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10. Remove spacer and handwheel gear.

11. (On SMB-3 and SMB-4 Operators ONLY) Loosen four capscrews and remove retainer ring from motor and handwheel shaft bearing.

12. Remove handwheel shaft which nay have to be tapped free from bearing.

13. (ON SMB-0 thru 2 only) Remove bearing from '

housias. s 6.6.7 Eandwheel Assembly and Disassembly (SMB-0 thru SMB-2 only) Refer to Figure 4.

1. If bearing must be removed,' remove "0" ring (if  !

installed) and retaining ring from the handwheel '

shaft. If the "0" ring is not on the shaft, look in the housing.

2. Remove retaining ring frw around the 0.D. of bearing and remove bearing.

6.6.8 Worm Shaft and Worm / Spring Pack Assembly Removal (see Figures 6 and 7)

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1. Pull on the spring pack from the handwheel end and remove from the housing. If the spring pack does not move easily, rotate the worm shaft from the motor end. This will unscrew the worn from the worm gear and force the spring pack out of the handwheel end of the housing. If further

, disassembly is required so to Section 6.9.1.

2. Remove four cap screws and bearing cap.

3. Remove worm shaft from the motor end of the case.

6.6.9 Drive Sleeve Assembly Removal

1. Remove bolts or capocrews and remove housing cover.

2. Using eyebolts in the threaded holes'in the end  !

(

of the drive sleeve assembly, lift the drive sleeve assembly from housing.

)

3. If further disassembly is required refer to

Section 6.9.2.

6.7 Cleaning, Inspection and Repair j

CAUTION: Use only approved solvent per MP 1410.63 for electri-

! cal parts and Part Kleen tool degressing solvent for i mechanical parts. Other solvents may be used with Quality Engineering approval.

! 6.7.1 Clean all mechanical parts removed from the actuator.

i 6.7.2 Inspect all parts for damage or ascessive wear. .

6.7.3 Small nicks or ' burrs on drive shafts and gears can be smoothed out with a honing stone or a fine file.

6.7.4 Carefully inspect all bearing assemblies for any defects in inner or outer races or the rollers.

Replace any bearing assemblies showing excessive wear or binding.-

6.7.5 Remove surface corrosion with penetrating oil and fine-grit crocus cloth or emery paper.

6.7.6 If all parts are determined to be satisfactory for l l reuse, proceed to Procedure Step 6 (I.initorque Actua- '

tor Reassembly).

, 6.7.7 If replacement of bearings or other parts is necessary j or it is desired to further disassemble the actuator, l

f 13 MP 1411.05.0 Procedure Section 6.9 provides specific instruction for disassembly and reassembly of each actuator subassembly.

NOTE: Prior to reassembly, verify the applicable sections of the data package have been completed.

6.3 Limitorque Valve Operator Reassembly NOTE: All bearings, worm, splined shafts and other load bearing parts should be greased prior to installation .

, in the operator.

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.6.8.1 Drive Sleeve Assembly Installation

1. Clean gasket surfaces of valve operator housing and housing cover.

2. Coat the entire drive sleeve assembly with grease.

NOIE: If the Limitorque operator was worked in place without the stem nut removed, the drive sleeve will have to be installed by engaging the stem aut threads with the stem i

( '" and rotating the stem nut with the lock nut removal tool until the drive sleeve assembly lower bearing is properly seated in the lower bearing cups.

3. Install the drive sleeve assembly into the case.

4. If the old gasket is still serviceable, place it

, on the mating surface of the case. If it is not i serviceable, replace it with a new gasket of the same thickness.

CAUTICII: The drive sleeve is shimmed to ensure proper tooth alignment of the worn and I

worm gear. The use of gaskets of different thickness may cause binding or improper drive sleeve alignment.

5. Install the housing cover.

6. Tighten the four bolts in a "criss-cross" pattern until sang.

6.4.2 Worm Shaft and Worm (Spring Pack Assembly) Installation

, (Refer to Figures 6 & 7)

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1. Install bearing on worm shaft (two bearings may l be required on type SMB 3 and 4).

2. Install retainer ring for bearing (s).

3. Install wozu shaft bearing cap (handwheel clutch pinion assembly).

4. Install worm shaft from motor end of housing.

Insert until bearing cap seats against the .

operator housing. '

5. Tighten the cap bolts in a criss-cross pattern.

6. Install fork return spring.

! 7. Install worm shaft clutch.

NOTE: Thinner set of lugs face toward handwheel clutch pinion.

8. Install worm shaf t clutch gear with spacer.

NOTE: Spacer installed on SMB-0 and SMB-1 only. I

9. Depress worm shaft clutch gear to compress fork  !

return spring and install split ring and split .

ring retainer. '

I.

10. Install retaining ring.

11. Install the worm (spring . pack assembly) on the I worm shaft. i NOTE: To engage the worn it asy be easier to l

, rotate the worn shaft clutch to engage  ;

the splines on the worn shaft.

12. By rotating the worm shaft in the proper direc-tion engage the worn fully with the drive sleeve.

I 6.8.3 Declutch And Bandwheel Shaft Installation i

1. Check the torsion spring cavity in the actuator

body, remove any foreign material if found.

l l 2. Install the torsion spring in the cavity, rotate the spring until the tang on the motor and goes into a estching hele in the actuator body, insert fully into cavity.

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3. Install the declutch shaft from the handwheel end.

4 CAUTION: Be certain the declutch handle keyway on the declutch straf t is pointing upward and the spilt pin is on the right (clockwise) side of the torsion spring tang on the handwheel end of the spring. .

4. Install retaining ring on motor end of declutch shaft (if required).

5. Install the handwheel shaft from motor end if possible. Install bearing retaining ring spacer and "0" ring. (SMB-0 thru 2 ONI.T)

6. (For SMB-3 and SMB-4 ONI.T) Install handwheel 1

shaft from the motor end. Install bearing retainer ring and tighten capscrews.

7. Be certain the "0" ring for the declutch shaft is in the opening for the declutch shaft in the

] cartridge cap. Replace if required.

( 8. Check the cartridge cap for the condition of the split pin, if it is best, broken or missing, ,

replace it.

9. For SMB-3 and SMB-4 only, install oil seal and needle bearings for handwheel shaft in the l cartridge cap.

10. Install the cartridge cap, use a new gasket if j the old one is damaged.

t

, 11. Start several of the screws which hold the .

cartridge cap in place.

12. Install the declutch lever and key. Tighten i

setscrew in handwheel.

l 13. Slide the cartridge cover to withis \" of tha j housing.

14. Depress the declutch lever and slide the cartridge cover flush with the actuator housing.

, 15. You any release the declutch lever but hold the  !

, cartridge cap cover tight against the housing.

l 16. Tighten the cartridge cap cover mounting screws. ,

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16 MP 1411.05.0

17. Install the declutch link on the declutch shaft.

NOTE: Link must be installed pointing as close to straight down as possible.

The flat side of the link should be toward the limit switch compartment..

13. Install retaining ring on declutch shaft to hold declutch link in place (if required).

6.3.4 Clutch Housing Installation

1. For the clutch housing remove clutch trippers and spring from clutch housing, if installed.

2. Install declutch shaft extension if required.

3. Install gasket and clutch housing using 4 cap screws. Tighten screws.

i NOTE: Declutch fork must fit inside grooves on wora shaf t clutch.

4. Install clutch trippers in same configuration they were in before removal (be sure same side facing outward). If the fingers are the new /

style, using came to achieve the proper height, be certain to match marks on the came and fingers match.

5. Install the capscrews and tighten. Install the tripper spring.

6. Engage the operator in manual and check operation of declutch mechanism.

NOTE: Rotate the worn shaft clutch gear by hand to return operator to motor operated mode.

1 6.8.5 Drive Motor Installation N011: Check to be sure the declutch mechanism works properly before installing drive i

motor.

CAUTION: If on SMB-4, valve operators the actor pinion gear key shows signs of damage or deformation, replace the key with a key made from type 4140 steel. l CAUTION: Ensure motor pinion is not installed backwards. .

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17 MP 1411.05.0

1. Install key and pinion on motor shaft ensuring it is a tight fit on the motor shaf t.

NOTE: Refer to Figure 1. Pinion arrangement is different for SMB-0 operators.

2. Tighten setscrew and install lockwire (if required).

NOTE: Add grease to clutch hausing cavity prior to motor installation.

3. Install motor gasket.

4. Reinstall motor while aligning drive pinion with clutch gear and carefully putting motor 1 eds into limit switch compartment.

5. Install mounting bolta and tighten.

6.g.6 Installation of Electrical Components in Limit Switch Compartment

1. Install terminal block (s) and space heater (if installed).

2. Install the position indicator module if the operator is equipped with one.

3. Install the geared limit switch.

i NOTE:

Do not turn limit switch set rod (s) at this time.

4. Prior to installation of the torque switch, reset the pointers to a setting of one (1) open and one (1) closed. Ensure that the valve'is not torqued and install the torque switet. in such a way that no rotation of the base plate is required to- ,

align the mounting holes. Reinstall the mounting screws and readjust the pointers to the desired setting.

CAUTION: Ensure the torque switch is not in-stalled upside down.

5. Connect all electrical leads according to the operator wiring diagram.

6. Install the limit switch compartment cover using a new gasket if required.  ;

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18 9 1411.05.0

7. Proceed with Section 6.10. 6.11 or 6.12, limitorque valve operator installation. If the valve operator was worked in place, proceed to Section 6.14, limit switch adjustment.

6.9 I.imitorque Valve Operator Subassemblies (disassembly and reassembly) 6.9.1 Spring Pack Disassembly / Assembly (Refer to Figure 7)

] NOTE: The spring pack assembly should not be disassembled unless absolutely necessary.

NOTE: Proper tension of the spring discs is very important. The amount of tension is con-trolled by the nut at the end of the worm shaft. The tension is adjusted by the

. number of turns of the nut.

1. Match mark the stem and elastic stop nut in a way that allows monitoring the marks during removal with a wrench attached.

2. Place assembly in a soft-jawed vice holding on the bearing outer surface.

s

3. Measure the distance from the torque limit sleeve -

and thrust washers b= hind Belleville springs -

record on Data Package.

4. Remove elastic stop nut, counting the exact j

number of turns to remove and record on Data Package.

CAUTION: The Belleville spring discs aust be removed and replaced in the exact same order. Use caution when removing the discs. Place them on the work bench where they will not be disturbed.  !

5. Remove thrust washer and the torque limit sleeve.

I I i

' 6. Remove Belleville spring discs and remaining thrust washer. Place on 3/8" bolt to keep in appropriate order.

7. Count the Belleville washers and measure thick-ness of each. All should be identical. Record on the data package.

8. Remove worm shaft with bearing from bearing l cartridge stem. .,

i

,_s_- -__ e,- _ _ . . .- - . -m _ _____-._,,_____,,m.. , _ _ _ , _ _ , _ - , _ . . . _ _ _ _ , _ - _ , _

19 MP 1411.05.0

.9. I,oosen setscrew and remove bearing locknut.

Remove bearing cartridge cap.

10. Inspect bushing. Remove and replace if worn.

11. Inspect worm. Remove and replace if worn.

12. Reinstall cartridge cap, new bearing and locknut.

Tighten and stake threads of setscrew.

1

13. Pack bearing with Exxon Nebula EP-1 grease.

14. Install worm shaft with bearing into bearing cartridge stem. -

15 . Install thrust washer, torque limit sleeve, Belleville spring discs and thrust washer.

16. Install new elastic stop nut with the same number of turns as Paragraph 4. Record number of turns on Data Package.

17. Measure the distance from the torque limit sleeve to thrust washer behind the Belleville springs.

Should equal the distance previously recorded -

paragraph 3.

3 6.9.2 Drive Sleeve Disassembly / Inspection / Assembly (Refer to Figure 8)

1. Remove lower bearing cone and spacer.

l NOTE: If worm gear requires replacement, the worm should be carefully inspected to ensure the worm has not been damaged.

2. Remove worm gear.

3. Remove upper bearf.ng.

!. 4. Inspect all parts for chips, gouges, burrs, nicks, etc. If any part shows excessive wear, it should be replaced.

5. Clean the upper and lower drive sleeve bearings with solvent and dry them.

6. Clean the upper and lower bearing journals on the drive shaft with solvent and dry them.

k

\

20 MP 1411.05.0

7. Inspect the bearing journals for gouges, nicks, burrs, etc. If such areas are present, dress with a honing stone or a fine file. Be sure to wipe the journals clean when finished.

8. Coat the bearing journals with a light film of ,

gresse. t

9. Reinstall worm gear.

10. Reinstall spacer and lower bearing cone.

I

11. Install upper bearing cone.

NOTE: Stem nut and locknut are to be in-stalled at time of installation, if they were removed during actuator removal from valve.

6.10 Limitorque Valve Operator Installation on HBC Gear Box (or non-rising sten valve) 6.10.1 Using suitable lifting device, position operator in position nex+,to BBC gear box (valve).

6.10.2 Carefully line up splines in operator with splines in gear box (valve) and slide actuator into place. against gear box flange.

6.10.3 Install bolts holding actuator to housing and tighten.

l 6.10.4 Reinstall any stem nut locking devices, if previously installed (usually a nut and washer).

6.10.5 With operator in ===1, rotate handwheel in each direction to ensure no binding of actuator or stem.

6.10.6~ Install protective cap or pipe.

6.11 Limitorque Valve Operator Installation on Valve with Stem Nut l Installed 6.11.1 Using suitable lifting device, position operator in position over valve stem.

6.11.2 With valve operator in ===1, carefully engage stem nut with valve stem threads.

6.11.3 Using care rotate valve operator handwheel in the "Open" direction while lowering operator onto the mounting flange.

~

21 MP 1411.05.0 1

6.11.4 Install and tighten flange bolts holding valve mount-ing flange to valve operator.

CAUTION: While performing this step, ensure valve disc is not jammed into the valve seat.

6.11.5 With operator in manual, rotate handwheel in each direction to ensure no binding of actuator stem.

6.11.6 Install cap or protection pipe.

6.12 Limitorque Valve Operator Installation on Valve with Stem Nut Removed NOTE: Be sure that operator to be installed is the original operator for the valve, or an acceptable replacement.

Use Model No., Serial No., and Order No. if necessary, to trace operator specifications and verify acceptability.

6.12.1 Lubricate valve stem and stem nut with approved lubricant.

6.12.2 Carefully lower valve operator onto valve body flange.

Install attaching bolts.

(- 6.12.3 Insert stem nut into operator; then screw stem nut on valve stem as far as it will go. Align stas nut and drive sleeve splines.

6.12.4 Push declutch lever down and turn handwheel to "0 PEN" direction until it cannot be turned any further. (This action causes stem nut to' fully retract into operator.)

6.12.5 Using special wrench or driftpin, screw locking nut into operator until snug.

6.12.6 Using chisel or punch, stake threads at two places (180* apart) Just above locking nut.

6.12.7 With operator in manual, rotate handwheel in each direction to ensure no binding of actuator or stem. )

1 6.12.8 Install cap or protective pipe.

6.13 Lubrication i

l 6.13.1 The main gear box and the geared limit switch shall be lubricated in accordance with the Lubrication Manual.

6.13.2 Limitorque valve operator motors are factory lubricat-( ed.for life.

l l

t

l 22 MP 1411.05.0 6.13.3 The following should be noted when inspecting the gear l box and geared limit switch lubrication.

i

1. Limit Switch: t

, s. Humble Oil Co. Beacon 325 grease is light .

' gray in color.

b. Mobil Oil Corp. - Mobil 28 is dark red in color.

2. Gear Box:

a. Exxon - Nebula EPI is dark tan in color and used for nuclear containment units.

All of the above gresses should be smooth and creamy, free of lumps and foreista matter.

6.13.4 Lubricant Requirements for the Gear Box:

Ihe approximate qpantities and weights for SMB actua-tors is as follows:

Size Quantity (Gals.) Weight (1bs . ) -

SMB-0 1.0 9.5 SMB-1 1.5 15.0 SMB-2 1.75 17.5 SMB-3 5.5 50.0 SMB-4 8.5 75.0 6.13.5 In the event that lubricact types are changed, the lubricants shall NOT be mixed.

CAUTION: Ensure pipe plugs used are on gear box and are not conduit plugs.

6.13.6 Unscrew two pipe plugs located on lower and upper side of case.

6.13.7 Using grease sun, inject clean fresh grease into lower pipe plus opening until grease reaches level of upper PiPa Plug opening.

6.13.8 Remove pipe plug on motor gear box and fill it with grease.

6.13.9 Inject grease into grease (zerk) fitting on handwheel housing.

. . - - - _ - - - . _ _ . . .. . - . ~ , , ~ - - . .

l 23 IfP 1411.05.0 i i

6.13.10 Reinstall pipe plugs. '

6.14 Limit Switch Adjustment Limit switches are driven directly by the same drive crain that turns the valve stem. They can be set to opera % at any specif-ic number of turns of the gear train. These witcham are normally set to operate at the end of travt:1 of the valve stems, thereby identifying the "OPEN" and " CLOSED" valve positions.

NOTE: Determine the type of valve the Limitorque actuator is operating and note whether it is a gate, globe ball, buttarily plu s, diaphrass, or other. If the valve is a ball or a butterfly type employing H_BC operators, set the limit stops per Section 6.17 before attempting to set limit switches.

6.14.1 Setting the "0 PEN" Limit Switch NOTE: Ensure all electric power is turned off to prevent the electric motor drive from turning on during switch adjustment. This el4=4==*es the potential injury to servicing personnel or damage to the valve.

1. Using the manual handwheel position the valve to the position listed on the data sheet for limit switch data. Then turn the set rod on the limit switch until it stops. DO NOT FORCE! This will engage the limit switch for subsequent steps.

2. Using the manual handwheel, close then fully open the valve noting below the direction of rotation of the intermittent gear shaft (refer to Figure 11).

Count the number of handwheel turns from full closed to full open and enter on data sheet.

D4.:ection of Rotation: Clockwise Counterclockwise

3. With the valve fully open it must be closed slightly to allow for backlash and coast down.

Rotate the handwheel in the closed direction until the valve stem starts to move. Now rotate the handwheel in the closed direction an addi-tional 1 of full stroke handwheel turns (i.e.,

)

if full stroke is 100 turns, rotate the handwheel turn in the closed dirrection beyond the point where stem motion starts).

l

24 MP 1411.05.0 NOTE: Setpoint for open limit switch may also be provided by the MOVATS Test Procedure Ref. 2.1.

NOTE: If difficulty is encountered determining the point of stem motion, match marks or a temporary pointer affixed to the stem or yoke may be used.

4. Turn the set rod clockwise until it stops (Figure 10).

DO NOT force!

5. By observint rotors outer contacts, note the position the limit switch believes the valve is in (refer to Figure 11).

6. If the limit switch indicates the valve is not yet open, turn the intermittent gear shaft in the direction noted in Step 6.14.1, Step 2 until the rotor contacts rotate to the "0 PEN" position (refer to Figure 11).

7. If the limit. switch indicates the valve is "0 PEN" or past "0 PEN", turn the intermittent sear shaft '

in the direction opposite that noted in Step 6.14.1.2 until the rotor contacts rotate (indication of s valve not open). Now reverse direction on the intermittent sear, shaft and turn until the rotor contacts rotate to the "0 PEN" position (refer to Figure 11).

8. Rotate the set rod counterclockwise until it stops. DO NOT FORCEI This re-engages the rotor gearing mechanism for normal operation. You should not be able to move the intermittent sear

shaft with your screwdriver. If you can move it, repeat Sections 6.14.1, Step 4 and 6.14.1, l Step 7.

6.14.2 Setting Closed Limit Switch on Ball, Butterfly, Plug, i

Diaphragm, or Other Non-Wedging Type Valve

1. Ensure all electric power is turned off to prevent the electric motor drive from turning on ,

during switch adjustment. This eliminates the l potential injury to servicing personnel or damage  ;

to the valve.

2. Manually operate the valve in the " CLOSED" J direction. Note the direction of rotation of the

"CICSED" rotor intermittent gear shaft (refer to ,

Figure 11). Record this direction below.

i t , _ _ _ _ _ _ _ _ - - , _ , _ _ _

l 25 IfP 1411.05.0 Direction of Rotation: Clockwise Counterclockwise

3. With the valve fully closed, it must be opened slightly to allow for backlash and coast down. t Rotate the handwheel in the open direction until i the valve stem starts to move.

1 NOTE: If difficulty is encountered determin-ing the point of stes motion, match marks or a temporary pointer affixed to the stem or yoke may be used.

t

4. Turn the set rod clockwise until it stops (Figure 10).

DO NOT FCRCE!

By observing rotors outer contacts, note the position the limit switch believes the valve is in (refer to Figure 11).

5. If the limit switch indicates the valve is not yet closed, turn the intermittent gear shaft in the direction noted in Step 6.14.2, Step 2 until the rotor contacts rotate to the " CLOSED" posi-tion (refer to Figure 11).

' (

6. If the limit switch indicates the valve is "CIOSED" or past " CLOSED", turn the intermittent gest shaft in the direction opposite that noted in Step 6.14.2, Step 2 until the rotor contacts rotate (indication of valve _NOT closed). Now reverse direction on the intermittent sear shaft and turn until the rotor contacts rotate to the "CICSID" position (refer to Figure 11).

7. Rotate the set rod counterclockwise until it stops. DO NOT FOR31 This re-engages the rotor gearing mechanism for normal operation. You should not be able to move the intermittent gear I

shaft with your screwdriver. If you can move it, repeat Sections 6.14.4 and 6.14.7.

6.14.3 Setting Closed Limit Switch on Wedging Type Gate and Globe Valves NOTE: To ensure proper operation of the torque bypass switch during valve unseating the HOVATS Test Procedure, Reference 2.1 will provide the proper " CLOSED" limit switch settings.

g 1. Ensure all electric power is turned off to prevent the electric motor drive from turning on

26 MP 1411.05.0 during switch adjustment. This eliminates the potential injury to servicing personnel or damage to the valve.

2. Manually operate the valve in the " CLOSED" i

direction. Note the direction of rotation of the

" CLOSED" rotor intermittent sear shaft (refer to Figure 11). Record this direction below.

Direction of Rotation: Clockwise Counterclockwise

3. With the valve fully closed and manually eng ged, rotate the handwheel in the "0 PEN" direction the number of turna specified by the MOVATS Test Procedure, Ref. 2.1. t 4 4. Turn the set rod clockwise until it stops (Figure 10) j DO NOT FORCEI By observing rotors outer contacts, note the position the limit switch believes the valve is in (refer to Figure 11). '

5. If the limit switch indicates the valve is not yet closed, turn the intermittent sear shaft in '

the direction noted in Step 6.14.3, Step 2 until /

the rotor contacts rotate to the "CLCSED" posi-1 tion (refer to Figure 11).

' 6. If the limit switch indicates the valve is "CLOSID" or past " CLOSED", turn the intermittent gear shaft in the direction opposite that noted in Step 6.14.3, Step 2 until the rotor contacts rotate (indication of valve NOT closed). Now reverse direction on the intermittent gear shaft

and turn until the rotor contacts rotate to the

" CLOSED" position (refer to Figure 11).

7. Rotate the set rod counterclockwise until it i

stops. D0 NOT FORCEI This re-engages the rotor gearing mechanism for normal operation. You should not be able to move the intermittent gear shaft with your screwdriver. If you can move it, repeat Sections 6.14.3, Step 4 and 6.14.3, Step 7.

6.14.4 Setting Four Trained Geared Limit Switiches l

6.14.1. A four train limit switch is essentially two, two train limit switches installed top to bottom (refer to Figure 10). The upper set of rotors are the "0 PEN" and " CLOSED"

, , , . , , . , . _ , . . . , .._.y -._.._e_y.---- _..,.y.. _ ,_,,,,m..,.,.,,..,,,,,__g ,,,,,,.y.,,,,__,___,o_v.m_ _ .,.. . .

..m.m .. . _ . . , _ _ _ _ _ _ _ _ _ _

27 MP 1411.05.0 rotors and are set per Sections 6.14.1 through 6.14.3.

6.14.2 The lower set of rotors are set in the same manner as the upper and are used for control

, functions. Position settings for these rotors will be supplied by Maintenance i Engineering. I 6.15 Torque Switch Setting (Refer to Figure 9)

NOTE: Terque switch settings will be provided by MOVATS Testing Procedure, Ref. 2.1, or by Engineering.

NOTE: The magnitude of the compression of the torque spring is empirically calibrated in foot pounds and a name-plate is affixed to each switch compartment (refer to Figure 9) denoting the calculated torque output at that setting. The maximum setting allowed by Limitorque for the particular application is also marked on the torque switch calibration tag.

6.15 .1 Torque setting must be made with switch mounted in Limitorque.

, ( 6.15 .2 Make sare all electric power is off.

6.15.3 Manually position the valve at sidstroke.

6.15 .4 Loosen the adjusting screws and move the pointers to the required setting. Tighten the adjusting screws.

6. 15.5 Operate valve electrically in conjunction with the

• MOVATS Test Procedure, Ref. 2.1, to determine if l

torque switch is operating properly. If further adjustment is required, repeat Section 6.15.

i 6.15 .6 Record final torque switch settings on data sheet.

6.16 Setting Position Limit Stops HOBC through E3BC Units

• 6.16.1 Eaz Nut Type Stop (Refer to Figure 12)

1. With valve in full closed position, remove limit stop cover plate.

l 2. You will note two travelling hex nuts, A and B.

If has nut B is near the position shown, run the hem out hand tight against the housing and so that one of the flats of the has nut is on top so as to face the cover plate.

1

,,-.,--g-,, ,----c,-- . _ ,,,-.. . - - -- - -

28 MP 1411.05.0

3. Replace the limit stop cover plate and turn input shaft of H-BC operator to fully open the valve.

4. Remove limit stop cover plate and check position of hex nut A. This nut should be turned until it is flush up against the end of the limit stop housing and one of the flats of the nut is on top facing the limit stop housing cover plate.

5. Bolt limit stop cover plate in position.

6.16.2 Key Nut Type Stop (Refer to Figure 12)

1. With valve in full closed position, remove end cap and limit stop housing.

2. If stop nut is near the-adapter cap (as shown),

i run stop n'at hand tight against the adapter cap face.

3. Slip on the limit stop housing and rotate limit stop housing to line up the nearest set of holes in adapter cap.

If stop aut is nearest extreme end of worm shaft, slip limit stop housing into position and rotate to move stop nut flush with end of limit stop housing.

4. Bolt limit stop housing in position and assemble end cap.

NOTE: The setting of the limit stop for the l

closed position automatically sets the open stop for 90* of travel.

I 6.17 Energization and Checkcut of Limitorque Operators Following Maintenance, Repair, or New Installation NOTE: MOVAT5 test unit may be installed at this time per Ref. 2.1.

6.17.1 Manually place valve in the mid position. Check for i correct polarity by energizing the open circuit for about one second.

NOTE: If valve travels in the open direction polarity is correct. If valve travels in the closed direction, 1) deemergize the circuit immediately, 2) exchange any two (2) phases if AC, or if DC, reverse the As and As connections.

l l

-l 29 MP 1411.05.0 6.17.2 F.nergize the valve in the open direction. After the motor has stopped, turn the actuator handwheel to ascertain whether adequate clearance exists between l the positi'on at which the valve stem comes to rest and l valve back seat.

6.17.3 Energize the valve in the closed direction. After the motor has stopped, turn the actuator handwheel to determine if proper seating has occurred. In the case of wedging type valves difficulty in turning the handwheel in the opea direction should be encountered until the gate or globe clears the seat. For non-wedging valves, tne aandwneel should not turn in the closing direction, but should turn relatively easily in the opening direction.

6.17.4 Operate the valve through two (2) complete cycles of open and close to ensure proper operation.

6.17.5 If during checkout adjustments are necessary, refer to '

the appropriate section of this procedure.

6.17.6 Ensure data sheett is completed to the maximum extent possible.

i

( 6.18 Inspection and Testing 6.18.1 For Type C Containment Isolation Valves (as listed in ST 5061.02, IIRT), a Local Leak Rate Test (LIJtT) will l

l be performed as determined by Maintenance Engineer.

LLRT must be performed if repairs may have affected the valve seating capabilities.

6.18.2 For Containment isolation valves as listed in ST 5064.01, perform cycling test and record isolation time (where applicable) per ST 5064.01.

N.

i 30 MP 1411.05.0 l

DATA PACIAGE FOR MOV.

LIMITORQUE VALVE OPERATOR MODELS SMB/SB-000 THROUGH 00 CORRECTIVE MAINTENANCE A. GENERAL INFORMATION:

Limitorque 6perator Type / Size / Handwheel Turns Serial Number Full Closed to Order Number Full Open MWO Number B. TORQUE SWITCH DATA:

AS FOUND SETTINGS:

Open Close AS LIFT SETTINGS:

Open Close CALIBRATION PLATE DATA:

NORMAL SETTING Number Foot Founds MAXIMUM SETTING:

Number TYPE:

i Conemin-mat Use (Brown / White)

Non-Containment Use (Red)

LIMITER PLATE:

Size 9

- - . ~ , - -

31 MP 1411.05.0 i

C. LIMIT SWITCH DATA:

TYPE:

Valve Position When Switch Disengaged Nuclear (Brown / White)

Non-Nuclear (Red / Black) Open Closed (Check One)

GEAR BCE:

Tour (4) Counter Gears Five (5) Counter Gears SIZE:

Two (2) Train

. Tour (4) Train D. MOTOR DATA:

1 SIZE:

Foot Pounds .

Initial Inrush Current Horse Power Running Current

( VOLTAGE!

AC.

Voltage During Operation DC Amps to Torque Out Stroke Time CURRENT:

Run For DC Notors Locked Rotor Shunt Current Arneture Current Insulation Class Duty Rating speed E. SPRING PACE DATA:

CALIEtATION PLATE DATA:

Part Number Number of Washers Thickness of Washers l

l l

l l

32 MP 1411.05.0 AS FOUND DATA:

Number of Turns on Locknut Orientation of Washers: Sat Unsat Number of Washers Thickness of Washers AS IZFT DATA:

Number of Turns on Locknut Any Changes Made to Washers

F. W . SI M O DATA NUMBER OF TEETH

Motor Pinion Gear WOR Shaft Gear NOTE: The total number of teeth in the motor pinion / worm shaft gear gearset, must be as follows:

SMB-0/1 - 72 teeth SMB-2/3 - 70 teeth SMB-4 - 72 teeth G. STEM NUT DATA:

TYPE:

One (1) Piece Two (2) Piece Threaded .

Non-rising -

H. CateSNTS:

Completed by:

Dates I

i

33 MP 1411.05.0 DATA AND SIGNOFF SHEET

1. Procedures and attachments have been verified with the control copy.

Verified: Date:

2. All notes, cautions, precautions, and limitations have been read and understood.

, Verified: Dater i 3. The following sections of the procedure were performed and verified as complete.

Verified: Date:

Verified: Date:

1 Verified: Date:

Verified

• Date:

4. The data sheets have been reviewed and the valve is ready to be returned to service.

Verified: Date:

5. The Shift Supervisar has been notified that work is complete and the system has been restored as directed by the Shift Supervisor.

Verified: Date:

34 MP 1411.05.0

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Figure 3. Clutch Housing, Trippers & Fork SMB-0 thru SMB-4 DECLUTCH FORK SET SCREW

- NEW STYLE CAP SCREW WITH ECCENTRIC BUSHING AND WASHER a

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OLD STYLE CAP SCREW

( ,9 WITH WASHER 0

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-CLUTCH HOUSING b 8

CLUTCH TRIPPERS

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Figure 4. Handwheel Shaft Components i

SM8 0 thru SMB 4 4

- HANDWHEEL ,

SET SCREW HANDWHEEL SHAFT

^

d

a -

HANDWHEEL GEAR M

/ SPACER 0

<o .

BALL BEARING ELASTIC STOP NUT

' SNAP RING C NOTE: SMB-3 and SMB-4 Have needle bearings located

• o in the cartridge cap for the handwheel end "

SNAP RING

1 Figure 5. Declutch Shaft Components SM8 0 thru SM8 4 SET SCREW SPRING CARTRIDGE CAP COVfR (SM8 0 THRU SMS 2 ONLY)

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SPRING CARTRIDGE CAP O

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IAANUAL DECLUTCH I O 8 DECLUTCH LINK

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DECLUTCH HANDLE DECLUTCH SHAFT f EXIENSION (NOT ON ALL UNIIS)

REY SPRING PIN TORSION SPRING

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5

/StiAP RING LOCATED HERE E-

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Figure 6. Worm Shaft Components SMB-0 thru SM8-4 I

WORM SHAFT i SNAP RING MOTOR END BALL SEARING C

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3 .

SPLIT RING I SPLIT RING RETAINER '

RETAINING O

Il FORK RETURN WORM SHAFT i

CLUTCH g SPACER HANDWHEEL CLUTCH E (SMS-0 & SMS 1 ONLY) PINION ASSEMBLY l

WORM SHAFT E CLUTCH GEAR S,

W G

Oguf* y,Sp0"E Pack /

s#-0 h s#4gssembW Co*P"g0015 i

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- Figure 8. Drive sleeve Components -

SMB 0 thru SMB 4 g 14t1.05. 0 000 0000006 w ROLLER BEARING t

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42 MP 1411.05.0 i

r TORCUE SWITCM CAUSMATION (SMS-00 "

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43 MP 1411.05.0

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Figure 12 .

r END

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DBAB I

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SECTION 1 Pmoctoums NUM88R. RevistoN Nuusan AND TITLE W/W W O MT h PA>D OA L mife&*n'& YA L Vu" ONh 4TnGL1; **V.:4~ <.w ,2 0 - si IMMEot ATE luPLaugNTArtom ygg g No O O wooieicArioN ro sur* oar 'ca i' v =>.irie + .

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t 30 MP 1411.05.0 /

f,9 g ' ~7 DATA PACEAGE FOR MOV.

LIMITORQUE VALVE OPERATOR MODELS SMB -0 THRU 4 CORRECTIVE MAINTENANCE A. GENERAL INFORMATION:

Limitorque Operator Type / Size / Handwheel Turns Serial Number Full Closed to Order Number Full Open NWO Number B. TORQUE SWITCN DATA:

AS FOUND SETTINGS:

Open Close AS LEFT SETTINGS:

Open Close-CALIBRATION PLATE DATA:

NORMAL SETTING Number Foot Founds MAEIMIM SETTING:

Number TYPE:

s ,, Containment Use (Brown / White)

Non-Costata===t Use (Red)

LIMITER PLAII:

Size l

l l

--w

4

. - . . 32 MP 1411.05.0 I - ,2 ;

l

AS FOUND DATA:

Number of Turns on Locknut Orientation of Washers: Sat Unsat Number of Washers Thickness of Washer Distance Sleeve to Washer AS LEFT DATA:

Distance Sleeve to Washer  ;

Number of Turns on Locknut  ;

Any Changes Made to Washers . , ,

p. , .#

F. CEAR SIZING DATA:

NUMBER OF TEETH:

Motor Pinion Gear WOR Shaft Gear NOTE: The total number of teeth in the motor pinion / worm shaft gear gearset, must be as follows:

-SMB-0/1 - 72 teeth SMB-2/3 - 70 teeti SMB-4 - 72 teeth G. STEN NUT DATA:

TYPE:

One (1) Piece Two (2) Piece Threaded Non-rising H. ColeGNTS:

i Completed by:

Date:

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DBAB e

CISTRIBUTION DAVIS BESSE NUCLEAR POWER STATION UNIT 1 orisia.i. R.sooaimi. S.ction M..d Action TEMPORARY MODIFICATION REQUEST E O 8926-1

(( ,_,,, ,;i. C,oy, M , r ue J

SECTION 1 PROCEDURE NUMBER, REvtSION NUMBER AND TITLE A$hlfll O$ kf.) O AfdrorY. w e?? Aer t O b $1MrWO=!d YO "- fB WI O ~

IMMEDI ATE IMPLEME NTATION ygg Q NO O O MooiriCATioN To Surroaf aCR ie v.. aitrieur cop >..io 1 Sh6ft Supe'vi.or 1 Working Copy

@ PROCEDURAL COMMITMENT 1 Control Roorn ' _ Control Room fil.

1 Cp.e.tions Eng. d Y / C-in _

RE ASON FOR CHANGE

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& K $13 / / ** j b f/

OETAILEO CH ANGES C lt * *rg e. (p. Jfo 3 Yo /2ted : /HQstea d y o /* Olte.f to t a f.lf f ect l

Y W- d Cr $,.60 f,,, I% On let $tt*/+t9k & R T 4. FOS i lN* b focK 12e $ 'Joo 0 . r e

15 PROCEDURE REVISION REQUIRED Ves No if no, thl. modification is veild until PREP AAR w-SY

/, DATE ep.ver

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" " m 4 d. ._ ,, s /zz /ets-SUBMITTED BY (S.ction Heed, dAV '

DATE DATE f/fUY RECOMMENDED B_ r a BY /1 (SRS _ Chairman)2 m AUG 281985

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DBABt e - usTR\euTION i

DAVIS SESSE NUCLEAR POWER STATION . UNIT 1 Orisiad. r'essene.ie Seitsen wees Aetron TEhrORARY MOOlFICATION REQUEST '

_ PueCoev.Masereno E o essS 1 /

SECTION 1 PROCEcuRE NuMeER. MsvielON NUMSEP: AND TITLE V' hN, 5. %Ak & _\WP YNS 4%

~

l tMMEDI TE IMPLEMENT A ION YES NO O l O MOOiFiCATiON Tc SuPPOa7 aCa iv ves eieirie ie seeiseio: ,

1 Shift Supervisor 1 Wortlag Ceey O saOCEDURAL COMMITMENT 1 Comi Re _ Cowel Reeen PHe iOes, n.En _  ;

1 esoe Q C I" REASON POR CMANCE t

hi. b wW (Wil k 'be b*) N. M E.b DETAtLEO CMANGES ML h bM3"14wua.Q s W.t s h wtwc w,es .

%Y b leo .

IS PROCEDURE REVISION REQUIRED PREPAREDSY .

\g DATE APPROVED gY \ ' DATE

- lO ' $ $~ Y APPROVED gY DATE SUSMITTED BY (Section Mess) DATE

. RECOMMENDED SY (SRS Chairmee( g DATE OCT 2.51988 B . tA a i A -- -

QA APPROv50 SY (QuelMy Aenerense i OATE C. , C MM ,W s , T- '

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(a) Sissie Thread (b) Doucle Thread (c) Tngle Tbroad l

1. Determine the number of thread starts.

Note: A convenient method is to wrap a string around the stem following one thread. If there are no gaps between the string, it is a single thread; 1 gap = double thread; 2 gaps = triple thread.

2. Count the number of lands in 1 inch = threads per inch (TPI).

3. Pitch will be determined by determining the threads per inch then picking the pitch from T;il: I n ;;;hed, Tgbl.

4. To determine thread lea'd multiply pitch X number of starts.

g %. s w. 0 A u c%+.. h%,+6 0h W nhwM ewvwoks%

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1320 ACME SCRIW TEREADS Table r.

Aroerican Standard General Purpose Acme Screw Thread Form -

Basas Dimenssoas* (ASA Br.31932) .

Width of Plat g [,g Thelt. Heizht of

• N.- Pitch. Thrend Crest of Inen Thrend Thickness . I (Basse). Thead. (Basic). Internal mg Thrend (Basic). e.37 cyp -

s p/2 8- H

1. = t/s p/2 silowancer p/2 o.259 X

• ti c.37o77 silowanset 2 or:25s o.c3t:5 o 0362 14 o c7t43 c.c3125 0.o232 0.02o6 82 o.03571 c.osof o.03371 0.oe313 0.04867 0.0265 o.o239 to o.goooo 0.0467 c. ca ttr7. o.ojog o.oScos o como o.e5000 o.0283 3 c.t Sco 0.0371 o.o625o c.o723 0.o6250 o.0319 3 6 o.itdri o.o8333 o.og33 o.c4333 0.o463 o.oast 3 a.2como o.tonom 0.o6 5 o.oS66 4 o.Itoo 'o.tocco c.o74 a.2 sono o.12wo a.13so o.125ao o.c689 3 o U333 c.16667 o.coc1 o.os73 2% c.1767 c.16667 o.1236 o 4 coco 0.2 coco 0.21oo 0.20o00 c.1 84 2 o Socco 0.1483 o.25com o.26co c.1432 i

th o e,o667 o.25o00 0.1853 c.18o2 t' t i

a.33333 o.3433 c.33333 t : 73 coo o.37500 ~ o.2471 o.2419

I t socoo 0-3850 0 37300 0.2780 o socco o stee 0.2728 o.scono a.37o7 o.3653

• ut ihw.at a. ins are in inches.

' \llo....n.

thrnds. is o.omo inch for to threads per inch and coarser, and o.oto inch for door 9

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. DBAB

.. TaseuTion l DAVIS 8 ESSE NUCLEAR POWER STATION . UNIT 1 od*"d "***"*'"* seeisen H s A.isen TEMPORARY MOOlFICATION REQUEST

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d ,,,_ Pii. coey. u===r Pu SECTION 1 Paocuouns Nuusam. navisioN NuMSER ANo TITLE HP 1411.05 MAINTENANCE AND REPAIR OF LIMTTOROUE VALVE OprWATOU TYPP OfR-O TWDif M . A ._ )

iuuso Ate vueLaue=TArio" O wooiascATroa To suraca7 Pea i' v=. ei.=ria = = i== => vis R wo O )

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im DcG- _

na AsoN PoM CHANGE Clarify existing and add additional instructions oETAILEo cMAesGEs

1. Under Section 1.3 change "6.9.5 & 6.9.6" to read "6.9.2" also change 6.9.9 & 6.9.10 to read "6.9.1'.'

2. Add note prior to 6.13.1 NOTE: If operator has been disassembled,.

lubricant inay be added at any convenient point during the reassembly process, rather than using pipe plugs after assembly is complete.

i See attached pages.

is rnocsouns asvision maousano PREPAReo SY oATE

/. oats APPnoveosy i- /M su W / oATE 9/s/f>-

APPRoveo s[_ 1. O, - - -

9 /e//sr oats t '

sueueTTao ev (s een nW$(/ .

MEcoMuGNoEo SY (sms chasFment 3 oats

?/fff 3_ o . LL QA APPMovEo SV {Quailty A SEP 111985 M oATE V 8 A,..ov.o ., iP, O.T u  :

mO SEP 111985 v OAT:

SEP 111985 v

e

- -- - - ,. <e, -

D2tsiled chang:s cont: '

c' . L .# , /

3. Add'the tellowing PP to section 6.8.3.. / >72

. 6.8.3.19 LOOSEN the cartridge cap c5ver plate and check for a gap between the locknut in the cartridge cap and the thrust washer on the spring pack. (If necessary remove the Declutch Lever) If a gap exists, Loosen the set screw in the lock-nut and turn the locknut until it just touches the spring pack thrust washer. DO NOT TIGHTEN, as this will put addi-tional preload on the spring pack! TIGHTEN the set screw to captivate the locknut in place. Replace the cartridge cap cover and declutch lever if removed.

i

4. Add following PP 6.6.9.3 NOTE: The upper and lower quad rings are '

now available for inspection and  !

replacement if required.

5. Add ~ note prior to PP- 6.10, 6.11 and 6.12 NOTE: Ensure the valve stem nut and valve stem are cleaned; In-spected and lubricated prior to operator installation.

6. Add the following new paragraphs following PP 6.13.10.

6.13.11 Lubrication and Inspection of limit switch and torque switch.

NOTE: Do not use abrasive cloth or paper to clean silver contacts of geared limit switch and torque switch. Contacts should be burnished, using the appropriate solvent and a lint-free c2sth.

1. Withthe[limitswitchremovedfromtheactuator,re-move tha screws and lockwashers and lift the finger ,

base off the rotor. Be careful not to apply a bend-ing force to the rotor, it could causa cracking it the groove pin area. This is the proper time to in-spect the ntor for cracks and the rotors and finger- ,

plate contacta for condition. t

2. Remove the two geared limit switch gear box covers by removing the machine screws and place in a plastic bag.

CAUTION: Care is required to prevent intermediate gear shafts from falling out during the cleaning operation.

3. Clean the gears inside the geared limit housing with l

a brush and proper solvent.

4. Clean the two covers.

5. Install one of the two covers.

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6. Pack the gear cavity with the proper grease, do not-pack solid. I. eave a small volume open for expansion.

Use Exxon Beacon 325 or Mobil 28 grease.

7. Replace the remaining cover.

8. Replace the finger base on the rotors. Replace the screws and lockwashers. Be extremely careful not to apply a bending force on the rotors.

9. The limit switch is ready for re-installation.

10. Inspect the torque switch contacts and clean if necessary. Inspect 'O' Ring and replace if required.

Carefully check general condition of switch and free-dom of operation.

7. Add the following senter.ce to the end of paragraph 6.14.3.3.

".......MOVATS test procedure Ref. 2.1.. If setting information is not available from Raf. 2.1, rotate the handwheel in the "0 PEN" direction the number of turns equal to 30% of full stroke handwheel turn as measured from the point of stem movement.

8. Add additional note prior to PP 6.9.1.1.

NOTE: Some operators have a locknut with set screw instead of an-elasti.; stop nut.

D e

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_ ._ _ _ _ . _ _ _ . ._. .. _