ML20136H156
| ML20136H156 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 10/04/1985 |
| From: | Briden D, Daft C TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML20136H086 | List: |
| References | |
| MP-1410.32, NUDOCS 8601090287 | |
| Download: ML20136H156 (34) | |
Text
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?!P 1410.32 Davis-Bassa Nuclear Power Station i Unit '4o.1 i
MAINTENANCE PROCEDURE MP 1410.32 ;
Testing of N Operated Valves Using 30 VATS J
- \ , a 4
Record of Approval and Changes i
Prepared by Thomas P. Baeler _
10/23/78 Submitted by " -
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Q 1 MP 1410.32.4
- 1. PURPOSE 1.1 The purpose of this procedure is to provide the guidelines for periodic maintenance of Limitorques to ensure reliable operation ;
of motor operated valves utilizing the Motor Operated Valve J Analysis and Test System (MOVATS). This procedure shall be l performed on each Limitorque in accordance with the preventative i maintenance schedule, or as needed for corrective maintenance. i 1.2 Not all portions of this procedure will be applicable to all motor operated valves.
. 2. REFERENCES 2.1 MOVATS Technical Manual 2.2 Limitorque Type SMB Instruction and Maintenance Bulletin, SMBI-82 (latest revision),
i 2.3 Limitorque type SMC-00 thru SMC-2 Instruction and Maintenance Manual, Bulletin SMCI-00 thru 2-85.
- 3. SPECIAL EQUIPMENT REQUIRED 3.1 The test requires specific elements of the MOVATS Series 2000 System.
- 4. PRECAITfIONS AND LIMITATIONS 4.1 Position an operator at the Motor Control Center (MCC) as necessary to operate the bresker for personnel safety / equipment protection.
4.2 Safety Tagging Procedure AD 1803.00 and TED Safety procedures will be in effect and followed throughout this procedure.
4.3 The procedure does not cover every circumstance or possibility.
When a problem or nonconformance is noted, work shall stop if the testing is detrimental to the operation of valve or system.
The testing electrician is responsible for notifying supervision to nasure that all deficiencies are resolved before a valve is returned to service. All deficiencies noted shall be listed on the Maintenance Work Order.
4,4 If slide-links must be repositioned, jumpers installed or wires lifted to cycle valve, the Jumper / Lifted Wire Data Sheet, Attachment 1, Page 3 of 3 aust be completed.
- 5. PREREQUISITES 5.1 The Shift Supervisor has given his permission to cycle the valve.
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2 MP 1410.32.4 5.2 A Radiation Exposure Permit must be completed for all work required in radiation areas.
5.3 Closing thrust values shall be given on MWO (if applicable).
5.4 Verify all test equipeent is calibrated. Inter calibration data on Section I of Attachment 1.
5.5 Appendix A any be referenced for additional information to operate the MOVATS 2000 Mainframe.
5.6 Only individuals that have completed the MOVATS Qualification Program or individuals under the direct supervision of qualified personnel may operate the MOVATS 2000 Mainframe.
5.7 Enter the symbol "NA" in the applicable blanks as necessary.
This is also appropriate when only portions of this procedure are being conducted as may occur during operability testing,- ,
etc.
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- 6. PROCEDURE NOTE 1: The installation of the test equipment on the operator may be performed in parallel or as directed by the test leader.
The sequence of testing any be varied at the discretion of r
the test leader.
- NOTE 2
- The valve may be cycled electrically prior to testing and where manual operation is called out at the test leaders discretion.
6.1 Complete Section I of Attachment 1 - NOVATS Test Data Sheet.
6.2 Check and set the open limit switch per MP 1411.04 for SMB 000 and SMB 00 or MP 1411.05 for SMB 0 through SMB 4. Record the
' number of handwheel turns required to fully cycle the valve in one direction on the NWO.
6.3 Check to see if the Spring Cartridge Cap (SCC) Adaptor is required. If required, proceed to Step 6.4.
6.3.1 Position the valve either electrically or manually such that the spring pack is in a relaxed state.
6.3.2 Remove the handwheel, declutch lever and the spring cartridge cap cover if required.
6.3.3 Clean both the handwheel shaft and the declutch lever shaft with emery cloth and/or a fine file to remove any burrs and rust before removing the SCC cover, if required.
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1 3 MP 1410.32.4 6.3.4 Reinstall necessary hardeare to hold spring pack in place, if required.
6.3.5 Proceed to Step 6.5.
6.4 MOVATS SCC Installation - (6.4.1 - 6.4.12 to be completed only if required.)
6.4.1 Position the valve either electrically or manually such that the spring pack is in a relaxed state.
6.4.2 Remove the handwheel and declutch lever if required.
6.4.3 Clean both the handwheel shaft and the declutch lever shaft with enory cloth and/or a file to remove any burrs and rust before removing the spring Cartridge Cover, if required.
NOTE: On those units equipped with handwheel gear reducers, it will be necessary to dismount the gear reducer from the SCC prior to removing the SCC.
6.4.4 Remove all but two allen screws in the SCC.
6.4.5 Bs.ch out the remaining screws approximately 1/8 inch '
while holding the declutch shaft in.
6.4.6 Loosen end cap.
CAUTION: Declutch lever shaft shall be held in position and not allowed to be pulled out when removing the end cap. A loud snap will be heard on removal of this end cap which is the torsion spring being released.
Do not be alarmed.
NOTE: Later models have the declutch lever shaft held in place by a snap ring located behind the declutch link which prevents the loud l snap mentioned above.
l 6.4.7 Remove the two remaining screws.
6.4.8 Remove the test unit's SCC.
6.4.9 Measure the depth of the test unit's SCC shoulder.
6.4.10 Adjust the depth of the MOVATS SCC shoulder so that it is the same as that of the test unit, if required.
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l 4 MP 1410.32.4 l
6.4.11 Ensure that the gasket is reinstallel on the MOVATS SCC.
6.4.12 Slide the MOVATS SCC on to the housing.
6.4.13 Replace all SCC bolts (SMB 0 through 2 require washers behind bolts).
6.5 ftB Installation NOTE: Ensure sprink pack is in its relaxed state.
6.5.1 Measure the distance between the outer flange of the SCC and the spring pack locknut, if required.
6.5.2 Install the appropriate TMD extension such that the i TMD is in the approximate center of its travel, if required.
6.5.3 Mount the TMD using one of the existing bolt holes in the SCC.
6.6 Switch Monitoring Device Installation ~
i CAUTION: Prior to performing this installation, ensure that all components within the electrical compartment have been de-energized, with the exception of DC power to the plant computer which may be de-energized to the extent necessary to perform the work safely.
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NOTE: The voltage sensing circuit switch monitoring will be used unless otherwise directed by the electrical maintenance engineering staff.
6.6.1 Voltage Sensing Circuit Connect alligator clips to the appropriate terminals, using the guidelines of Attachment 3.
6.6.2 Current Sensing Circuit.
After review of the control circuit, lift the appropriate terminal leads and install the M0 VATS monitoring circuit, per Attachment 4. List wires lifted on Attachment 1.
6.6.3 Connect dead man switches as necessary to protect the open and close circuits.
6.6.4 Connect a clamp on ammeter to monitor motor current.
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l 5 MP 1410.32.4 l 6.7 Current Measuring Device Installation NOTE: The current signature may be taken either at the valve or at the MCC, using either a Fluke or a Simpson Ammeter.
6.7.1 Clamp the amp probe on the appropriate motor lead.
NOTE: Appendix G may be referenced for additional information.
6.8 Torque Switch Balancing NOTE: Check the installed torque switch to determine if it has balancing provisions. If so, balance the switch as specified in this section. If torque switch balancing is not required, Steps 6.2.11 through 6.8.12 i vill not apply.
6.8.1 Position the valve either electrically or manually so that the bypass switch for the open torque switch is open.
! NOTE: Ensure that the open torque switch is neither bypassed or removed from circuit.
6.8.2 Remove the upper bearing housing bolts one at a time and replace with load cell support rods.
6.8.3 If the valve stem does not raise above the operator when the valve is completely open, insert the appropriate extension rod.
6.8.4 Continue to install the STCD as shown in Attachment 2.
6.8.5. Adjust the torque switch to a setting of 1.0 in both ,
the open and closed direction (or aa close to 1.0 as practical) or at an equal setting as determined by the electrical maintenance engineering staff.
6.8.6 Electrically open the valve monitoring TMD and switch output.
6.8.7 Record the displacement of the spring pack (DSP) at torque switch trip (TST) on Attachment 1,Section II.
NOTE: Appendix B may be referenced for additional information.
6.8.8 Electrically close the valve monitoring TMD and switch output.
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6 MP 1410.32.4 6.8.9 Record the DSP at TST on Attachment 1,Section II.
NOTE: Appendix B may be referenced for additional information.
6.8.10 If the difference of the millivolts movement in the open direction and the millivolts movement in the closed direction is less than 100 av, then the torque switch will be considered balanced. If so, proc ed to 6.9.
6.8.11 To balance the torque switch, change the positim of the adjusting arm on the torque switch.
NOTE: On torque switches with top mounted adjusting screws, turn desired screw out to increase setting. On torque switches with bottoa mounted adjusting screws, turn desired screw in to increase setting.
6.8.12 Repeat steps 6.8.6 through 6.8.11 and record final displacements of the spring pack at torque switch trip for both the open and close direction on Attachment 1,Section II.
6.9 Spring Pack Calibratics 6.9.1 Zero scope and. ensure load cell in calibrated.
NOTE: Appendix C may be referenced for additional information.
6.9.2 Reset the torque switch to 1 2.0.in both the open and close-direction or at equal settings as directed by the electrical maintenance engineering staff.
6.9.3 Run the valve open into the load cell monitoring TMD and load cell output. Store and record the data on Attachment 1,Section VI.
6.9.4 Record preload on Attachment 1,Section III.
NOTE: Appendix D may be referenced for additional information.
6.9.5 Determine the spring pack constant (K-Factor) and record on-Attachment 1,Section III.
NOTE: Appendix E may be- referenced for additional information.
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7 MP 1410.32.4 6.9.6- Position valve so the stem or stem extension rod is not against the load cell and the spring pack is in a relaxed state.
CAUTION: Do NOT disconnect load cell cable with mainframe energized.
6.9.7 Remove the load cell and stem extension rod if used.
6.10 TMD and Control Switches Signature Acquisition NOTE 1: Actual thrust = TMD displacement x E-factor + preload.
NOTE 2: Appendix F may be referenced for additional information.
6.10.1 Reset the torque switch per EISA as referenced on the MWO unless target thrust valves are directed by engineering.
NOTE: Maximum thrust should not exceed these values:
SMB-000 8,000 lbs.
SMB-00 14,000 lbs.
SMB-0 24,000 lbs.
SMB-1 45,000 lbs.
SMB-2 70,000 lbs.
SMB-3 -140,000 lbs.
SMB-4 250,000 lbs.
6.10.2 Record target value on Attachment 1,Section IV (if applicable).
NOTE: Steps 6.10.3 through 6.10.7 may be repeated if control switches are not setup properly.
Only the "As I, eft" data is to be stored.
6.10.3' Operate the valve closed monitoring THD and switch ,
output. Store electrically and record the storage data in Section VI on Attachment 1.
6.10.4 Determine open to closed cycle time and record on Attachment 1,Section V.
i 6.10.5 Operate the valve open monitoring TMD and switches
! output. Store electrically and record the storage data in Section VI on Attachment 1.
l l 6.10.6 Determine closed to open cycle time and record'on l Attachment 1,Section V.
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8 MP 1410.32.4 NOTE: The bypass on e' 4 and globe type operators shall be set t .t will open at twenty (20) percent minus to (0) plus five (5) percent of the stroke .me starting from the point that the valve disc starts to move.
6.10.7 Based on the analysis of the control switch setup, determine if all switches are set up properly. If not, record deviation on Attachment 1,Section V, and reset and retest as required.
NOTE: When storing signatures for a detailed final analysis, store only corresponding closing and opening signatures.
6.11 Motor Current Signature Acquisition NOTE: Appendix G may be referenced for additional information.
6.11.1 With the valve initially in the open position, electrically operate the valve to the close position while monitoring switches and motor current. Store electrically and record the storage data on Section VI on Attachment 1.
6.11.2 Operate the valve in the open direction, again, monitoring motor current and switches output. Store electrically and record the storage data in Section VI on Attachment 1.
6.11.3 Remove the TMD, switch monitoring device and the ammeter as applicable.
6.11.4 Remove the MOVATS SCC and replace with the SCC or SCC cover of the test unit as applicable.
CAITIION: Declutch lever shaft must be held in position and not allowed to be pulled out when removing the end cap. Later models have the declutch lever shaft held in place by a snap ring located behind the declutch link.
6.11.5 Ensure that the SCC' gasket is reinstalled.
l 6.11.6 Remount the handwheel gear reducer and handwheel, as applicable.
6.12 Comments 6.12.1 Record any comments on the Data Sheet.
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9 ffP 1410.32.4 6.13 Final Testing NOTE: Position personnel at the valve, !!CC, and control room. Establish communications so that proper operation can ba observed.
6.13.1 Electrically operate the valve to the close position.
6.13.2 Verify that the valve has sested in the close direction.
This may be done by engaging the handwheel and moving it in the close direction. There should be some take up of the linkage of the gear-train in the operator and essentially no movement of the stem to further close the valve. Sign Verified By, Attachment 1, Page 1, Step 3.
6.13.3 Electrically operate the valve two complete cycles, once locally and once from the Control Room, if applicable, to verify proper valve and operator operation.
6.13.4 The valve should be placed back in its as found position or as directed by the shift supervisor.
- 7. ACCEPTANCE CRITERIA 7.1 The results of the testing have been reviewed by the electrical maintenance staff and have determined that the operator is adjusted and operating correctly.
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10 MP 1410.32.4
!!WO #
VALVE #
DATA AND SIGNOFF SEET
- 1. Procedure and attachments have been verified with the controlled copy.
Verified Date
- 2. All notes, cautions, precautions and limitations have been reviewed and understood.
Verified Date
- 3. The valve has seated when electrically operated close.
Verified Date
- 4. Testing is completed and all test equipment has been removed from the operator.
Verifiad Date
- 5. The Shift Supervisor has been notified that work is completed and the system has been restored as directed by the shift supervisor.
Verified Date
- 6. The data has been reviewed by the maintenance staff.
Verified Date
- 7. Comments:
F Attachment 1 Page 1 of 3
MOVATS TEST DATA SHEET
.WO # :
. SECTION I Record Operator Informatlos Recore Valve Information Type: I.D. #:
Size: . Type:
Serial No.: Size: l Order Number: Valve Body Orientation:
Stes Orientation:
Record Motor Information '
1 Volts: Control Circuit Volts: '
q Rated Amps: AC or DC Control Circuit: AC/ DC ,
i Speed: Open Control: LIM / TOR :
5 Borsepower: Closed Control: LIM / TOR AC or DC AC/ DC Breaker f:
Orientation: Top / Side / Bot (for Switch Sensing Circuit: VOL / Ct2 _,
boria.
stem)~ ~
I Record System Information Record Torque Switch Information j System: Open Torque Switch Setting:
1 Flow: Closed Torque Switch Setting:
I-Temp: Limiter Plate Size:
Press: TS Balancing Capability:
Record Test Equipment Numbers and Calibration Due Dates
! Mainfrase: / / Initial Position of Valve: 0 / C j Load Cell: / / Final Position of Valve: 0 / C j TMD: / / Safety Related: Yes No Amp Probe: / /
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TORQUE SWITCN BALANCING 4
SECTION II:
i As Found DSP at TST OPEN TSS Final DSP at TST OPEN As Found DSP at TST CLOSED _/_ Final DSP at TST CLOSED l
l i SPRING PACE CALIBRATION
- SECTION III
Spring Pack Constaat f/V Preload:
. SECTION IV:
! Record Target Thrust Value ~ Record Actual Thrust Values (Optional) OPEN Volts DSP = # at TSS CIDSED __
CLOSED Volts DSP s # at TSS Target Value 2101 3,
SECTION V: BYPASS SETTING TORQUE SWITCN AS LEFT CYCII TIPE OPEN CLOSED OPEN TO CLOSE:
! CLOSE TO OPEN: As Fe.and Mia Mas As Left
! l SECTION VI: FULL STROR ACQUISITION
! CYCT.E ID BUBBLE /8 LOCK SUBBLE/ BLOCK RANGE / RATE / RANGE TL - CAL / 5 -/ 5 10v/ eS/ 4v
- TS - OC / 1 / 2 10v/ eS/ v TS - CO / 3 / 4 10v/ eS/ v CS - OC / 1 / 2 v/ eS/ v CS - CO / 3 / 4 v/ as/ v i 1
l Attachment 1 !
PaSe 2 of 3 l
11 MP 1410.32.4 210 VATS TEST DATA SHEET ffWO #:
Attachment 1 Page 2 of 3
12 MP 1410.32.4 JQfPERS/ LIFTED WIRE DATA SHEET JUMPERS INSTALLED ORG
? FROM TO VERIFIED BY VERIFIED BY LITIED WIRES WIRE L121w LI Au VERIFIED RESTORID VERIFIED NUMBER FROM BY BY BY BY f
SLIDE-LINES REPOSITIONED
, TERMINAL POSITION OF REPOSITIONED VERIFIED RESTORED VERIFIf.D NUMBER SLIDE-LINK BY BY BY BY l
l Attachment 1 Page 3 of 3
13 W 1410.33.4 LOAD CELL SUPPORT PLATE DIAGRAM l
I E E
+
I I IN I N
% LOAD CELL kJ ,Q )
I SUPPORT PLATE T 4 T A T T T A I i i ! I N NBS CERTIFIED EXTENSION i {
LOAD CELL l
ROD i g (optional) 2 -
+
~
h\ SUPPORT
+
T l l f -
RODS T l ^
l 2 ,
I i z tir- l 1 I
=
~
Z l l T
UPPER THRUST <
BEARING HOUSI. I l l b Ibl iI I l iI l l t
/ u 1 i tj I
l I
VALVE STEM i
NOTE: Each load cell support place is identified as to what size of operator it is to be used on.
, Attachment 2 Page 1 of 1
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14 MP 1410.32.6 .
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VOLTAGE SENSING CIRCUIT l
NOTE: The switch monitorina device may be connected at the valve operator, as shown, or at another location that is electrically equivalent.
RED OPEN LIMIT SWITCH OPEN BYPA!S SWITG iLS-4; '
LS-5
(. I i <>
l OPEN TORQUE SWITCH L J BLUE CLOSED LIMIT SWITCH CLOSED BYPASS SWITCH
- LS-8 ;
LS-1 i i , <>
CLOSED TORQUE SWITCH L J LS-(
/ \.
ORANGE LS-2 I
o
, OPEN
\
POSITIVE Connect white to ground on AC and to the negative side on DC 4
0 0 Attachment 3 Page 1 of 1
15 - IfP 1410.32.4 CURRENT SENSING CIRCUIT -
?
NOTE: The switch monitoring device say be connected at the valve operator, as shown, or at another location that is electrically equivalent.
GREEN OPEN LIMIT SWITG OPEN BYPASS SWITCH U47 g !!0 VATS y LS-5 1
PENTHOUSE P0ieT.R TO GREEN AND BLUE (ORANGE & RED / BLACK) g s OPEN TO.%UE SVITCH BLUE OPEN STROKE WHITE CLOSED LIMIT SWITCH CLOSED BYPASS SWITCH
,, 78 g 110 VATS y ,
PENTHOUSE LS-1 POWER TO BLACK AND WHITE (RED & WHITI/BMcK)
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CLOSED TORQUE SWITCH BM CLOSED STROKE Attachment 4 l Page 1 of 1 i l
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i 16 MP 1410.32.4 APPENDIX A GUIDELINES FOR USE OF MOVATS 2000 MAINFRAME
- 1. The following information will apply to the acquisition of data using the MOVATS 2000 Mainframe.
- 2. The following controls are laid out from right to left on the mainframe front panel.
- 3. Trigger control must be in auto mode, the auto button must be in.
- 4. Time per point may be set on 1 as, but will be adjusted depending on data being acquired.
- 5. Channel A & Channel B Controls
- a. Channel mode switch: ON
- b. Volts full scale switch: WILL BE ADJUSTED depending on signature and conditions.
- c. Input BNC switches: (-)GND (+)DC NOTE: Ensure that the load cell or switch signature is always in the upper half of the screen and the TMD or current signature is always in the lower half.
- 6. Expansion Controls
- a. Vertical expansion switch: OFF
- b. Horizontal expansion switch: OFF
- c. Auto center switch: ON
- d. Display switch: ROLL CAITIION: The MOVATS 2000 Mainframe must be de-energized prior connecting and disconnecting load cell cable.
- 7. Connected cable input leads to corresponding terminals on back of MOVATS penthouse. Preliminary scope adjustments are complete.
- 8. To store a set of signatures depress the " Red Store" button before
- they leave the screen.
CAUTION: Ensure MOVATS 2000 Mainframe is energized before inserting bubble memory module.
Appendix A Page 1 of 2 l
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1 17 MP 1410.32.4 APPENDIX A (Cont.)
- 9. Plug the memory module into the back of the test unit (after moving the " record" switch on the bubble in the direction of the arrow.)
- dAmmuG: Never touch pin contacts of memory bubble.
- 10. Depress the "indes" button until the appropriate block # appears at the top of the screen.
- 11. Press the " auto center" switch to the " select" position to choose the signature you wish stored on this bubble block. Note the " channel identifier" at the middle bottoe of the screen.
, 12. Press the " write" buttons on the Nicolet Unit (under the screen)
. and on the Input Unit simultaneously.
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- 13. Press the " auto center" switch downward to select other channel.
14 Press the "index" button to change " blocks" or insert another bubble and "indez" to the appropriate block.
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i Appendix A Page 2 of 2
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18 MP 1410.32.4 APPENDIX B .
GUIDELINES FOR TORQUE SWITCH BALANCING
- 1. Adjust the torque switch to a setting of 1.0 in both the open and closed direction (er as close to 1.0 a: practical) er at an equal setting as deterunned by the electrical maintenance engineering staff. To determine if the torque switch is tripping with an equal amount of thrust in both the open and closed direction, you must set up to monitor spring pack deflection (TMD) and switch trip sensing.
- 2. Set MOVATS penthouse Channel A to switches, and set Channel B to TMD. Direction of switch monitoring is set to correspond to direction valve is stroked. Set mainframe Channel A to 4 v volts full scale j setting and Channel B to 10 v volts full scale setting. Sampling rate should be set at las time per point.
- 3. While monitoring TMD and switches, operate valve in open direction until torque switch trip. When valve opens and signal is acquired on screen, use cursor to determine last data point when torque switch trips. Using that point in time, cursor vertically to THD curve and determine the spring pack displacement in volts. Record the volts 1 displacement on Attachment 1 Section II.
CAITTION: Bypass switch for open torque switch must be open to allow valve to de-energize when stas contacts load cell.
! 4. While still monitoring TMD and switches operate valve in close direction until valve seats.
- 5. Once torque switch trips, deflection of spring pack at torque switch trip may be determined in same manner as was used in open stroke.
Record displacement on Attachment 1,Section II. A voltage difference any greater than 100 av between the open and closed torque switch i shall be considered out of balance.
- 6. To balance the torque switch, change the position of the adjusting are on the torque switch.
- 7. Repeat Steps 3 through 6 and record final displacements of spring pack at torque switch trip for both the open and close direction on Attachment 1,Section II.
i Appendix B Page 1 of 1
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19 MP 1410.32.4 APPENDIX C LOAD CELL CALIBRATION GUIDELLNES
- 1. Adjust MOVATS penthouse Channel A to load and Channel B to TMD.
- 2. Set Channel A input BNC switches to the ground position.
- 3. Push reset numerics switch until RN identifier display is not visable on screen.
- 4. Adjust the Channel A "DC offset" control to zero (110 mV).
- 5. Reset Channel A (+) input BNC switch to DC position: If numerics reads other than zero, adjustment is made on back of scope turning ,
LOAD ZERO, adjusting screws; Rechack after adjustment to ensure proper zero (t 10 mV).
- 6. When scope is zeroed, push calibration button on front of penthouse and compare numerics on scope to load cell calibration number supplied with each load cell.
- 7. Adjustment may be made using load span adjusting screw on back of scope.
- 8. Once load cell is calibrated (t 10 eV), to acquire signature set Channel B to 10 volts full scale and Channel A to appropriate setting in Table A. Set time per point to 1 as.
TABLE A VOLTS FULL LOAD CELL EXPECTED THRUST SCALE SETTING SOE 0 - 25,000# 4 50E 25,000 - 50,0004 10 200E 50,000 - 200,000# 4 l
Appendiz C t Page 1 of 1 l
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20 MP 1410.32.4 APPENDIX D GUIDELINES TO DETERMINE PRELOAD
- 1. Measure the apparent preload of the springpack by positioning the vertical cursor on the last data point of the TMD signature before springpack displacement.
1
- 2. Move the cursor to the corresponding point in time on the load cell
- signature. Reset numerics to 0.
- 3. Nove cursor back in time to an average point before A load was applied. Multiply the millivolt displacement by 10,000 if 50K load cell is used or 100,000 if 200K load cell is used. Record Preload i ~on Attachment 1,Section III.
NOTE: If preload is 0, Preload is less than running load.
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l Appendix D Page 1 of 1
21 MP 1410.32.4 APPENDIX E GUIDELLNES FOR CALCULATING K-FACTOR
- 1. Position the cursor 'on an average data point of the TMD signature before spring yack displacement.. Reset numerics to G.
- 2. Move cursor to a point equal to approximately a quarter of spring pack displacement. Note value.
- 3. Move cursor to the corresponding point in time on the load cell signature. Reset numerics to 0.
- 4. Move cursor back in time to an average point before load cell displace-ment. Note sullivolt displacement of load cell and subtract the millivolt displacement of preload. Divide this number by the TMD displacement noted in Step 2.
NOTE: K-FACTOR (lbs/V) = LOAD CELL DISPLACEMENT-PRELOAD DISPLACEMENT TMD DISPLACEMENT
- 5. Repeat Steps 1 through 4 at approximately one-half and approximately three quarters of total spring pack displacement. Average the three values and multiply by 10,000 if the 50K load cell is used, or 100,000 if the 200K load cell is used.
- 6. To . check the linearity of the K-Factor select a random TMD displacement, multiply it by the K-factor then add the preload, note this calculated value. Move the cursor to the corresponding point in time on the load cell. Reset numerics to 0 and measure back to 0 load. Multiply millivolt displacement by 10,000 if 50K load cell is used or 100,000 if 200K load cell is used. Each calculated value must be within 10%
of actual load cell value to be considered linear.
NOTE: If K-Factor is not linear, ensure that the maximus TMD displacement against the load call is equal to the maximus TMD Displacement of the closing stroke.
Appendia E Page 1 of 1
22 MP 1410.32.4 APPENDIX F GUIDELINES FOR ACQUIRING TMD ~ AND CONTROL SWITCHES SIGNATURES l l
- 1. When obtaining TMD and control switches signatures ensure the entire l signatures are obtained.
- 2. Operste the valve closed monitoring TMD, with Channel B, and switch output, with Channel A. Store electrically and record the storage data on Attachment 1,Section VI.
- 3. Determine the open to closed cycle time by moving cursor to the last point in time before spring pack relaxation on the TMD signature.
Reset numerics to 0. Move cvrsor vertically to the switch signature.
. Move cursor to last point in time before torque switch trip and j record time on Attachment 1,Section V.
- 4. Operate the valve open monitoring TMD, with Channel B, and switch output, with Channel A. Store electrically and record the storage data on Attachment 1,Section VI.
- 5. Determine the closed to open cycle time by moving cursor to the last point in time before spring pack relaxation on the TMD signature.
Reset numerics to 0. Move cursor vertically to switch signature.
Move cursor to last point in time before limit switch trip and record time on Attachment 1,Section V.
- 6. To set open bypass switch perform the following steps:
- a. Move cursor to point where disc starts to move on TMD signature.
- b. Reset numerics to 0.
- e. Move cursor to switch signature.
}
- d. Nove cursor to last point in time before limit switch trip and note time.
- e. Bypass is to trip at 20% (-0%, +5%) of the noted time.
- f. Move cursor to far right of screen (time equals zero).
, 3 Move cursor left until time determined in Step d, plus time from beginning of cycle to disc novement, appears on the screen.
f
- h. Operate valve closed. *
- i. Operate valve open until TMD signature reaches the cursor.
l I j. Stop valve.
Appendix F Page 1 of 2
23 MP 1410.32.4 APPENDIX F (Cont.)
- k. Set bypass switch.
- i. Check bypass to ensure switch is made for the first 20% (-0%,
+51) of disc travel.
- s. Repeat steps a through 1 as necessary.
i 4
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s Appendiz T Psse 2 of 2
I 24 MP 1410.32.4 l l
APPENDII G l l
GUIDELINES FOR ACQUIRING MOTOR CURRENT SIGNATURES
- 1. Motor current may be acquired with the use of a Simpson Ammeter or fluke ammeter for AC valves or a Fluke AMP meter for DC values.
Output on the mainframe for the Simpson will be 10. asps / volt. Output ,
of the fluke will be 10 amps / volt on the 20 amp scale and 100 amps / volt on the 200 AMP scale. NOVATS scopes equipped with an AC/DC current switch on the back of the penthouse must be properly set at this time. The Fluke AMP probe must be zeroed with the scope to achieve proper AMP reading.
- 2. To zero the fluke with the scope perform the following steps.
- a. AC/DC switch to the voltage of valve being tested.
- b. Current to "th anel B".
- c. Channel B ENC switch to "GND".
- d. Autocenter "0FF".
- e. Reset numerics "0FF".
- f. Find "0V"with cursor.
3 Nove DC current trace to cursor and "0V' level with DC offset adjustment.
- h. Channel B BNC switch to "DC".
- 1. Clamp fluke current probe on de-enernized actor lead.
- j. De-magnetize head by turning probe off then on.
- k. Zero output of fluke with thumbwheel.
- 1. Autocenter "0N".
- 4. When monitoring current on the DC actor, connect fluke AMP probe between series field / shunt field and ground side of DC system with positive side of AMP probe r.a motor side. The current in both the shunt field and the series field must be monitored for total current.
This current monitoring only applies to compound wound DC actor. All others will have to be addressed on an individual basis.
NOTE: It will be necessary to turn the Fluka off and then back on between strokes of the valve to ensure the removal of any residual flux in the assnetic core of the Fluke.
- 5. Set the channel full volts scale on the scope to the desired value, set per Table B.
. Appendiz G
. Page 1 of 2 l
l 1
9 25 MP 1410.32.4 APPENDIX G (Cont.)
TABLE B AC VALVE FLA RATED AMPS SIMPSON RANGE' FULL VOLTS SCALE Less than 1 amp 20 .4V use than 4 amp 20 IV Less than 8 amp 200 2V Less than 16 amp 200 4V Getr.than 16 amp 200 10V DC VALVE FLA RATED AMPS FiliEE RANGE FULL VOLTS SCALE Less-than 1 amp 20A .4V Less than 4 amp 20A IV Less than 8 a'ap 200A 4V Less than 16 amp 200A IV Getc.than 16 amp 200A IV l
l l
Appendix G ElfD Page 2 of 2 I
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, 6.14 Licit Switch Adjustment (Figure 4) i
[..*,7, Limit switches are driven directly by the same drive train that turns the valve stem. They can be set to operate at any specific number of turns of the gear train. These switches are normally set to operate at the end of travel of the valve stems, thereby identifying the "0 PEN" and
{ " CLOSED
- valve positions. q NOTE: !
Determine the type of valve the Liinitorque actuator is operating and n i
, butterfly plug,ote whether or diaphragm, it is a gate, globe ball, other. i
, I NOTE: There are four adjustable rotors used with this limit
! switch. The procedures below are for setting the close '
3 and open mtors which have the motor contacts and torque t i
switch by-pass contacts on thms. The Int. I and Int. 2 rotors with the indicating lights on them will be set at l
the same position as the close (Int. 2) and open (Int.1)
{ mun.
1 i
6.14.1 Setting the '0 PEN" Limit Switch 4
i NOTE: Ensure all electric power is turned off to
! prevent the electric motor drive from l turn 4ne on durine switc1 ad.fustment. This eTiminites the pdtential injury to servicing personnel or damage to the valve.
- 1. Using the manual handwheel position the valve to the 4
position chr ec: red b4 t w -te s r 4. a =
- W
, Then turn the set rod on the limit switch counter clockwise until it stops. DO NOT FORCE!
- 2. Using the manual handwheel, close then fully open the valve noting below the direction of rotation of the intermittent gear shafts during the open cycle.
j Count to full the open number of handwheel and enter on Wo.turns from full closed i
Direction of Rotation During Open Cycle of Valve. ;
- Clockwise t Counterclockwise .
! 3. After fully opening the valve you must then close it i
slightly to allow for backlash and coast down. Actate i
the handwheel in the closed direction until the valve stem starts to move. New rotate the handwheel j in the closed direction an additional 55 of full stroke i handuheel turns (i.e., if full stroke is 100 turns, rotate the handwheel 5 turns in the closed direction
~ beyond the point dere stas motion starts).
! NOTE: If difficulty is encountered determining the point of stas motion, match marts or a temporary pointer -
I affixed to the sta or yoke soy be used.
l i
4
- '-g e
- 4. Turn the ht rod clockwise until it stops. 00 NOT FORCE!
[ f .-
- 5. By observing the inner retor contacts (the ones next to the ,
gear box), note if these contacts are closed or open. l 1
- 6. If the contacts are closed, turn the intamittent gear !
shaft in the direction noted in Step 6.14.1.2 until
, the rotor contacts open.
i '
- 7. If the contacts are open, turn the intermittent gear shaft in the direction opposite that noted in Step :
6.14.1.2 until the rotor contacts close. Now reverse direction on the intamittent gear shaft and turn until j the rotor contacts open.
- 8. The Int.1 rotor is set at this' time by repeating j
Section 6.14.1 Steps 6 and 7 for Int. I rotor.
- 9. Rotate the set rod counterclockwise until it stops.
00 NOT FORCE! This re-engages the rotor gearing mechanism for nomal operation. Turn or check the intamittent gear to ensure engagement of these gears. ,
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 M0 VATS Test Procedure, N'*a 3 S- will provide the proper " CLOSED" limit j switch settings, j
- 1. Ensure all electric power is turned off to prevent the electric motor drive frae turning on during switch il adjustment. This eliminates the potential injury to servicing personnel or damage to the valve. l
- 2. Manually operate the valve in the ' CLOSED
- 4. action. i Note the direction of rotation of the intamittee. gear i shafts. Record this direction below. l Direction of Rotation: Clockwise Counterclockwise
- 3. With the valve fully closed and manually engaged, rotata the handwheel in the "OPEN" direction the number of turns specified by the MOVAT3 Test Procedure, /MPiv/0 33 l 4. Turn the set rod clockwise until it stops DO NOT FOACEI Sy observing the inner rotor contacts (the ones next to the
- gear box), note if these contacts are open or closed.
i
, 5. If the contacts are closed, turn the intermittent gear i
shaft in the direction noted in Step 6.14.3.2
{ until the rotor contacts open.
i
- 6. If the contacts are open, turn the intemittent gear
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4 shaft in the direction opposito that noted in Step /
6.14.3.2 until the rotor contacts close. Now i reverse direction on the intamittent gear snaft and turn until the rotor contacts open.
7.
The Int. 2 rotor is to be set at this time by repeating Section 6.14.3 steps 5 and 6 for Int. 2 rot.or.
8.
htste the set rod counterclockwise until it stops.
00 NOT FORCE! This re-engages the rotor gearing mechanism for nomal operation. Turn or check the interurittent gear to ensure engagement of these gears.
6.15 Setting Torque Switch NOTE:
Torque switch settings will be provided by MOVATS Testing Procedure, m9,wo.3;L, or by Engineering.
j NOTE:
The magnitude of the compression of the torque spring is empirically calibrated in foot pounds and a nameplate is
- affixed to each switch compartment denoting the calculated torque output at that setting. The maxima setting all' wed o j by Limitorque for the particular application is also .
marked on the torque switch calibration nameplate.
6.15.1 Torque sahing must be made with switch mounted in j
the operator.
I 6.15.2 Make sure all electric power is off. Shift the valve j to manual operation. ,
6.15.3 Loosen the adjusting screws and move the pointers to
(
I the required setting. Ttghten the adjusting screws.
6.15.4 operate valve electrically in conjunction with the l
MOVATS Test Procedure, wiv,e,72., to determine if l
torque switch is operating properly. If further l
adjustment is required, repeat Section 6.15.
! 6.16 4
Energization and Checkout of Limitoree Operators Following Maintenance, Repair, or New Installation l NOTE:
MOVATS test unit may be installed at this time per Ref. 2.1
! 6.16.1 Manually place valve in the mid position. Check for
- correct polarit l about i second.y by energizing the open circuit for '
NOTE:
If valve travels in the open direction polarity is correct. If valve travels in the closed direction,
- 1) de-energize the circuit famediately, 2) exchange any two (2) phases if AC, or if DC, reverse the i At and At connections.
i) ,.4 6.16.2 Energize the valve in the open direction. After the '/ ~ ,,; l '
motor has stopped, turn the operator handwheel to ascertain whether adequate clearance exists between the position at which the valve stas comes to rest and valve back seat.
6.16.3 Energize the valve in the closed direction. After ,
'the motor has stopped, turn the operator handwheel '
to detemine if proper seating has occurred. In
- the case of wedging' type valves, difficulty in turning the handwheel in the open direction should be encountered until the disc clears the seat.
For non wedging valves, the handwheel should not turn in the closing direction, but should turn relatively easily in the opening direction.
6.16.4 Operate the valve through two (2) complete cycles of open and close to ensure proper operation.
6.16.5 If during checkout adjustments ,are necessary, refer u~ ron aus. Typs s ,. c - a a r8 ~ sm . ,._ -
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