ML18010A834
| ML18010A834 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 10/09/1992 |
| From: | CAROLINA POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML18010A832 | List: |
| References | |
| CS-0022, CS-0022-R02, CS-22, CS-22-R2, GL-89-10, NUDOCS 9210280065 | |
| Download: ML18010A834 (30) | |
Text
~2~0280065 9ggp09 PDR ADQCK 0500pgpp PDR Carolina Power & Light Company PO Box 1551 Raleigh, North Carolina 27602 Shearon Harris Nuclear Power Plant Unit 1 Mechanical Analysis and Calculations for 1CS-752 Charging Pump C to Refueling Water Storage Tank Isolation Valve N( Ill:IIICNQili(t)ILIB Generic Letter 89-10 Applicable:~Yes No Valve Classification: Nuclear-Safety Related Calculation Number *CS-0022 Revision Prepared By/Date Verified By/Date Project Engineer/Date Prin. or Res. Eng./Date Signatures on file Signatures on file Reason incorporation of Electrical Calculation E5-DD1, Revision 1 Reason incorporation of PCR-6547, Revision 1 Reason
Prepared By:. Calo. ID *CS 0022 Checked By: Revision: 2 List of Effective Pa es pacae Revision 1
2 3
4 5
6 7
8 9
10 11 12 13 14 15 16 17 18 19 Attachment A Telecon w/Velan Inc.
Attachment B Fax from of Velan Attachment C Flow Isolation/Seating Thrust Attachment D Average Closing Packing Load Attachment E Final Thrust Due to Inertia Attachment F Thrust at Torque Switch Trip Attachment G Design Verification Record 1CS-752 Page No: 1
Prepared By: Calc. ID! *CS-0022 Checked By: ~
Revision: 2 TABLE OP CONTENTS Section Descri tion pacae 1.0 Purpose 2.0 References 3.0 Bases and Assumptions 3.1 Analyzed Configuration 3 ' Valve Function and Control Configuration 3.3 Assumptions 4.0 Calculations 4.1 Generic Letter 89-10 Applicability 4.2 Design Differential Pressure Evaluation 4.3 Valve Thrust 4 ' Recommended Minimum Torque Switch Setting 11 4.5 Motor Capacity Limits 4.6 Allowable Operating Ranges 12 4.7 Stall Evaluation 14 4.8 Required Limit Switch Settings 15 4.9 Nominal Operating Time 17 5.0 Results, Conclusions and Recommendations 19 Attachment A Telecon w/Velan Inc. 1 page Attachment B Fax from of Velan 3 pages Attachment C Flow Isolation/Seating Thrust 1 page Attachment D Average Closing Packing Load 1 page Attachment E Final Thrust Due to Inertia 1 page Attachment F Thrust at Torque Switch Trip 1 page Attachment G Design Verification Record 2 pages 1CS-752 Page No: 2
Prepared Calc. ID: *CS-0022 By.
By'heeked Revision: 2 CI 1~0 PURPOSE
- 1. 1 Pu ose of this Re ort The purpose of this report is to document various parameters pertaining to the subject motor-operated valve. This report:
reviews the design differential pressure against which the valve may have to operate calculates the MOV thrust/torque requirements evaluates the limitations of the actuator, motor, and valve (evaluation includes effects of a motor stall) evaluates the actuator limit switch settings 1.2 Reason for Revision PCR-6547, Revision 1, removed the Alternate Mini-flow Relief Valves and installed restricting orifices upstream of motor-operated valves 1CS-746 and 1CS-752. The control logic for these motor-operated valve will be modified such that they will automatically open upon high RCS pressure (2300 psig) coincident with an "S" signal and will automatically close at the reset pressure of 1750 psig. The reason for this revision, is to incorporate the changes made by PCR-6547, Revision 1.
2 ' RERERENCES F 1 NED Design Guide DG-I.11, "Q-List Motor-Operated Valve Mechanical Evaluations", Revision 4.
2 ' NED Scope Document Q9-M0-002, Revision 2.
2 ' "Analysis of Overload Protection and Motor Torque Output for AC Motor Operated Valves" E5-001, Sub-Calculation CPL-MOV-053, Revision 2.
2.4 Control Wiring Diagram CAR 2166-B-401 Sheet 319, Revision 5.
2.5 Corrective Maintenance Procedure CM-I0002, Revision 4.
2.6 Valve Vendor Print 1364-53850, Revision 1.
2 ' Technical Manual ISP, Volume 2, Revision 18.
1CS-752 Page No: 3
Prepared Bys Calo. ZD: *CS-0022 Checked By: Revision: 2
2.0 REFERENCES
Continued 2.8 Chemical & Volume Control Piping, Reactor Auxiliary Building, Plans, CAR-2165-G-140, Revision 23.
2.9 Chemica l and Vo lume Control System Description SD 1 07g g Revision 2.
- 2. 10 Crane Technical Paper No. 410, Nineteenth Printing 1980.
- 2. 11 Technical Memorandum "Performance and Properties of Limitorque Components", Number TM-G-XXXX-001, Rev. 0.
2 ~ 12 Piping Line List, CAR-1364-B-0070, Revision 44.
- 2. 13 Westinghouse E-Spec. No. G-678852, Revision 2.
2 ~ 14 Design Basis Document DBD-104, Revision 0.
2.15 RAB Tank Area Sections, CAR-2165-G-251, Revision 18.
2.16 Piping Isometric 1-CS-650, Revision 7.
2.17 Limitorque Order Sheet 377628-G 2.18 PCR-6547, Revision 1, "Alternate Mini-Flow Re-Design" 3 ' BASES AND ASSUMPTIONS 3.1 'Anal zed Confi ration The configuration assumed when performing this analysis is as follows:
Actuator Data Limitorque Order Number: 377628-G Actuator Size & Type: SMB-00 Overall Unit Ratio: 94.0:1 Handwheel Ratio: 4.38:1 Handwheel Efficiency: '54 Worm Set/Gear Ratio:
Worm Set Efficiency: 364 Applications Factor: 0.9 Installed Spring Pack: 60-600-0022-1 Pullout Efficiency: 4 04'0%
Run Efficiency:
Stall Efficiency: 504 1CS-752 Page No: 4
Prepared By: Calc. ZD: 4CS-0022 Checked By: Revision: 2 3.1 Anal sed Confi ration Continued Motor Data Foot-Pounds: 10 RPM: 1700 Volts: 460 AC Valve Data Manufacturer: Velan Valve Size & Type: 2-inch, globe Valve Pressure Class: 1500 psig Mean Contact Seat Diameter: 1.875 Stem Configuration: 1 '25D-1/3P-2/3L Stroke Length: 1.5 inches 1 Walkdown Data "Motor-Operated-Valve Data Form" 2 NED Design Guide I.11 (Reference 2.1) 3 Limitorque Order Sheet (Reference 2.17) 4 Emdrac Print (Reference 2.7) 3~1~1 oss-reference Numhe s The Ebasco (construction identification) tag number for this valve is 2CS-V759SB-1.
The Westinghouse Identification Number and Location are 2TM78FNM and 8489B respectively.
3.2 Valve Function and Contro Conii ration 3.2.1 Valve Function The alternate mini-flow line is for dead head protection of the CSIP's during safety injection (specifically the injection phase of the SIS operation). Valves 1CS-746 and 1CS-752 are designed to open automatically upon high RCS pressure (2300 psig) coincident with an "S" signal and will automatically close at the reset pressure of 1750 psig (Reference 2.18). These valves are located in parallel on the two alternate mini-flow lines which relieve to the RWST.
1CS-752 Page No: 5
Prepared By! Calc. ID: *CS-0022 Checked By: Revision: 2 3.2.2 Control Confi ration The following statements are derived from references 2.4, 2.5 and 2.18.
This MOV automatically opens upon high RCS pressure (2300 psig) coincident with an "S" signal and will close at the reset pressure of 1750 psig.
Under normal conditions this MOV can only open 1RH-63 and either 1CS-165, 1CS-166 or 1CS-753 if valves 1RH-25, are closed.
This MOV trips out via the torque switch in the closing direction and is electrically de-energized by the open limit switch, in the opening direction.
The open torque switch and thermal overloads are automatically bypassed on loss of 'offsite power or a safety injection actuation.
- 1) The minimum torque delivered by the actuator motor is assumed to be 5.9 ft-lbs per reference 2.3.
- 2) The maximum torque delivered by the actuator motor is assumed to be 11.2 ft-lbs per reference 2.3.
- 3) The Stem Factor for a coefficient of friction of 0.15 is 0.0156 and a coefficient of friction of 0.2 is 0.0179 (reference 2.1).
- 4) The flow limiting component in the alternate mini-flow line is the fixed orifice. The flow capacity of this orifice is 60 gpm nominally (reference 2.18).
- 5) The maximum operating temperature and design temperature for line number 2CS2-786SN-1 is 130 F and 200 F respectively (reference 2.12).
- 6) Piping frictional losses are ignored when calculating differential pressure at the valve.
- 7) The 0.433 psig/ft conversion factor used in this calculation is based on water at 60 F (reference 2.10).
1CS-752 Page No: 6
Prepared By: Calc. ZD! *CS-0022 Checked Bys Revision: 2 4 ' CALCULATIONS 4.1 Generic Letter 89-10 A licabilit Valve 1CS-752 is located in the CSIP alternate mini-flow line and is designed to open automatically upon high RCS pressure coincident with an "S" signal and automatically close at the reset pressure (Reference 2.18). The alternate mini-flow line is for dead head protection of the CSIP's during safety injection (specifically the injection phase of the SIS operation)..
Based on the preceding paragraph and the guidance provided in reference 2.2, the requirements of Generic Letter 89-10 are a licable to this MOV.
4.2 Desi n Differential Pressure Evaluation 4~2 ~1 S stem Inlet Pressure Upstream pressure will be assumed to be equal to the shutoff head of the CSIPs plus the static head of the RWST at its maximum level.
CSIP s uto head:
6200 feet (ref. 2.7)
- 0.433 psig/foot = 2, 684 psig Static Head:
RWST Maximum Level = 301 ft. (ref. 2.15)
Valve Elevation = 249 ft. (ref. 2.16)
(301 ft. 249 ft. )
- 0. 433 psig/ft 23 s1 Upstream Pressure is equal to: 2,707 psig 4.2.2 Differential Pressure The maximum differential pressure (dP) occurs when maximizing the upstream and minimizing the downstream pressure. To maximize dP, it is assumed that
~ ~
the downstream pressure is 0 psig.
Therefore, the maximum differential pressure is 2,707 psid.
1CS-752 Page No: 7
Prepared By: Calo. ZD: *CS-0022 Checked By:. Revision: 2 4.2.2 Differential Pressure Continued Note: The subject MOV is a pressure under the seat globe valve.
The most conservative opening differential pressure assumption is to assume 0 psid since any line pressure would assist the valve in opening. For this reason opening upstream pressure and differential pressure are not calculated.
i.3 Valve Thrust 4.3.1 Valve Thrust Re ired at Maximum dP The maximum thrust requirements for the operation of this pressure under the seat globe valve may be determined by the following equations, which are provided by reference 2.1.
CLOSING THRUST = (dp
- A
- FV) + SBL + [SA*(P-dP)]
OPENING THRUST = SBL (dP
- A) [SA*(P-dP)]
where:
THRUST The required stem thrust, in pounds-force.
dp The differential pressure across the valve.
A The seat area of the valve, which is 2.76 square inches based on contact seat diameter (Section
- 3. 1) ~
An empirical valve factor,, which is 1.1 per reference 2.1.
SBL The stuffing box load, or packing drag, expressed in pounds-force. This is 1500 pounds per reference 2.1.
SA The area of the stem, in square inches. For the stem diameter given in section 3.1, this area is 0.99 square inches.
The inlet system pressure.
1CS-752 Page No: 8
Prepared By: Calo'D: *CS-0022 Checked By: Revision: 2 4.3.1 Va ve Thrust e i ed t M um dP cont.
From the information given above, the closing thrust may be calculated.
CLOSING THRUST (2 i 707*2 ~ 76*1 ~ 1) + 1 i 500 + [0 ~ 99*(2 (707 2 i 707]
8I218 + li500 + 0
= 9,718 pounds The value of 9,718 pounds includes a conservatism of approximately 10% due to the assumed valve factor of 1.1, and an additional conservatism of approximately 500 to 1,000 pounds due to the assumed packing load of 1,500 pounds (see attachment D).
In addition, normal CP&L practice is to multiply the calculated closing thrust by 1.15 in order to account for possible VOTES measurement errors and torque switch repeatability. Thus, the theoretical calculated closing thrust is 11,176 pounds.
NOTE Liberty Technologies issued a 10CFR21 notification on 10/2/92 which documents potential thrust measurement inaccuracies due to torsional effects on small stems.
A review of the design of 1CS-752 has confirmed that the anti-rotation device is located in the yoke flange, above that portion of the stem where the VOTES calibrator was installed. Thus, the subject 10CFR21 notification does not apply to this valve.
The calculated minimum allowable closing thrust of 11,176 pounds is within the thrust capabilities and ratings of the valve and actuator, which are 14,432 and 14,000 pounds, respectively.
However, there is a concern that inertial effects may cause the final thrust to exceed the continuous ratings of the actuator and valve. A review of differential pressure test data for 1CS-752, which was tested at approximately 2,730 psid, indicates that thrust at torque switch trip was 11,131 pounds (attachment F).
Final seating thrust due to inertia was 13,432 pounds (attachment E), which represents a thrust increase of 214. Since the assumed VOTES measurement error is +104, the actual final thrust may exceed the continuous thrust ratings of the actuator and valve.
Thus, it is desirable, if possible, to adjust the torque switch to trip at a lower value of thrust.
1CS-752 Page No: 9
Prepared By- Calc. ZD: *CS-0022 Checked By- Revision: 2 4.3.1 Valve Thrust Re ired at Maximum dP cont.
Test data for 1CS-752 indicates that flow isolation was achieved at 7,804 pounds (attachment C) of thrust at an indicated test dP of 2730 psid. This test was performed with a spool piece installed in lieu of the relief valve. The proposed configuration of multiple orifices installed upstream of the MOVs will reduce upstream pressure at the valve, thereby making the results of this previous test conservative. The average closing packing load during the RF03 test was 456 pounds (attachment D).
This packing load is included in the 7,804 pounds of thrust at flow isolation; therefore, the thrust required to overcome differential pressure is equal to 7,348 pounds. In order to allow for future packing adjustments, a packing load of 1500 pounds will be assumed.
From the information given above, the expected closing thrust may be calculated.
CLOSING THRUST 7 i 348 + 1 i 500 + [0 99*(2 i 707
~ 2 i 707]
7i348 + li500 + 0
= 8,848 pounds A differential pressure and line pressure of zero is assumed to provide for the most conservative opening thrust. From the information given above, the closing thrusts may be calculated.
OPENING THRUST = 1,500 (0*2.76) [0.99*(0-0)]
1,500 0 0
= 1,500 pounds.
4~3 ' Minimum Allowed D a ostic Thrust The minimum allowable closing/opening thrust at torque switch trip shall be 1.15 times the calculated required thrust when actuator torque is ) 50 foot-pounds and 1.20 when actuator torque is ( 50 foot-pounds, in order to account for possible measurement errors and torque switch repeatability. Thus, MINIMUM CLOSING DIAGNOSTIC THRUST = REQUIRED THRUST
- 1.15 8)848
- 1 15 10,175 pounds ICS-752 Page No: 10
Prepared By: Calc. ZD: *CS-0022 Checked By: Revision: 2 4 ' ' Minimum Allowed Dia ostic Thrust Continued MINIMUM OPENING DIAGNOSTIC THRUST = REQUIRED THRUST
- 1.20 1,500
- 1.20 1,800 pounds 4.4 Recommended Minimum Tor e Switch Settin s The input torque (actuator torque) required to produce the thrust values calculated in section 4.3, may be calculated using the following equation (reference 2.1).
ACTUATOR TORQUE = THRUST
- STEM FACTOR Based on the stem factors given in section 3.3, Assumption 3, the actuator torque for the normal opening and closing conditions may be calculated as follows:
MINIMUM CLOSING TORQUE = 10,175
- 0.0179
= 182 ft-lbs MINIMUM OPENING TORQUE = 1,800
- 0.0179 32 ft-lbs 4.5 Motor Ca acit Limits The available motor torque at degraded-voltage conditions limits the available actuator torque. If a torque switch is set above the minimum available torque, there is a possibility of stalling the motor before the torque switch can actuate. In order to prevent this situation, the maximum torque switch setting value shall not exceed the minimum available torque provided by the motor at degraded-voltage conditions.
1CS 752 Page No: 11
Prepared By: Calo. ID: *CS-0022 Checked By: Revision: 2 4.5.1 Closin Actuator Tor e as Limited b Motor Ca acit According to reference 2.1, the closing actuator torque that will be developed by the minimum available motor torque (reference 2.3) is calculated as follows.
ACTUATOR TORQUE = MOTOR TORQUE
- UNIT RATIO *, RUNNING EFF.
- 0.9 5.9
- 94.0
- 0.50
- 0.9 250 foot-pounds 4.5.2 0 enin Actuator Tor e as Limited b Motor Ca acit According to reference 2.1, the opening actuator torque that will be developed by the minimum available motor torque (reference 2.3) is calculated by:
ACTUATOR TORQUE = MOTOR TORQUE
- UNIT RATIO
- PULLOUT EFF.
APPLICATION FACTOR 5.9
- 94.0
- 0.4
- 0.9 200 foot-pounds 4.6 Allowable 0 eratin Ran es 4.6.1 Maximum Thrust and Tor e Limits Thrust Limits The allowable thrust limits of the actuator and valve are shown below. The limiting components in the opening and closing directions define the maximum allowable continuous thrust setting.
COMPONENT LIMIT POUNDS SOURCE ACTUATOR *12 600 REF. 2 ~ 1 VALVE CLOSING **12 989 Attachment B VALVE OPENING **12,989 Attachment B This limit is 90% of the Limitorque qualified continuous rating.
These limits represent 904 of the Velan continuous duty ratings as provided in attachment B.
1CS-752 Page No: 12
Prepared By: Calc. ID: *CS-0022 Checked By: Revision: 2 4~6~1 aximum Thrust and Tor e im ts Co t ued Tor e Limits The allowable torque limits of the actuator and valve are shown below. The limiting component defines the maximum allowable continuous torque setting.
COMPONENT LIMIT FOOT-POUNDS SOURCE MOTOR CLOSING 250 SECTION 4.5 MOTOR OPENING 200 SECTION 4.5 ACTUATOR *225 REF. 2.1 SPRINGSET PACK 250 REF. 2.11
- This limit is 904 of the Limitorque qualified continuous rating. ~
4.6.2
~ E ivalent Normshaft Tor e From reference 2.1, the wormshaft torque that must be applied to
~
achieve a required output torque may be calculated by:
~
WORMSHAFT TORQUE = RE UIRED OU PUT TOR UE WS RATIO
- WS EFFICIENCY 4.6.2.1 Closin Wormshaft Tor e The equivalent wormshaft torque is provided for the purpose of verifying the closed torque switch setting with a torque wrench.
MINIMUM WORMSHAFT TORQUE 182 11 23 FOOT-POUNDS 45
- 0.36 135 INCH-POUNDS MAXIMUM WORMSHAFT TORQUE 13.89 FOOT-POUNDS 45
- 0.36 167 INCH-POUNDS 1CS-752 Page No: 13
Prepared By: Calc. ID: *CS-0022 Checked By: Revision: 2 4.6.2.2 O enin %ormshaft Tor e For this valve the recommended minimum opening torque setting is 32 foot-pounds, and the maximum allowable open torque setting is 200 foot-pounds. However, it is not pxactical to set the opening torque switch with a toxque wrench because this would cause the stem to be forced against the backseat. Therefore, the open torque switch shall be adjusted to a setting of "1" to "2" (Reference 2.11).
4.7 Stall Evaluation According to electrical analysis (refexence 2.3) performed for this valve, the maximum available motor torque at the most favorable conditions is 11.2 foot-pounds.
According to reference 2.1, the stall torque of the operator may be calculated by:
ACTUATOR STALL TORQUE MAXIMUM MOTOR TORQUE
- UNIT RATIO
- STALL EFFICIENCY 11.2
- 94.0
- 50~ = 526 FOOT-POUNDS The corresponding stall thrust may be calculated as follows (reference 2.1):
Note: The stem factor for a coefficient of friction of 0.15 is used for conservatism (see section 3.3).
STEM FACTOR
~5 6 = 33,718 POUNDS 0.0156 The one-time limits of the valve and actuator are as follows:
COMPONENT LIMIT SOURCE ACTUATOR TORQUE 500 FOOT-POUNDS REF. 2.1 ACTUATOR THRUST 35 000 POUNDS REF. F 1 VALVE CLOSING 35 616 POUNDS ATTACHMENT B VALVE OPENING 35 616 POUNDS ATTACHMENT B 1CS-752 Page No: 14
Prepared By: Calc. ZD: *CS-0022 Checked By: Revision: 2 i.7 Stall Evaluation Continued The calculated stall forces for this Motor Operated Valve (MOV) indicate that the potential does exist for damage to the actuator if a stall should occur.
This does not indicate that an operability concern exist. A stall condition is not a normal mode of operation for a MOV, and is the result of a prior equipment failure.
A stall condition is created by the failure of a limit switch or torque switch to stop valve motion when desired. This causes the operator to continue to drive the valve until a mechanical limit/
either the seat or backseat, is reached, at which time the motor is forced to stop or "stall". Zf this failure is assumed to occur during an accident, it constitutes the "single active failure", and the. stall condition is a continuation of this failure. The stall will not render the MOV inoperable, because the switch failure will have already done so.
i.8 Re ired Limit Switch Settin s As shown in reference 2.4, the actuator is equipped with a four train limit switch assembly, arranged in the following manner:
4.8.1 Bases of Limit Switch Set oint Re irements Rotor 1 Rotor g1 acts as the open limit switch, in order to stop the motor after the valve has traveled to the full open position. Zt provides position indication (it turns off the green indicator lamps when the valve is full open). Zn addition, rotor g1 provides a bypass around the closing torque switch as the valve starts closed.
The practice at SHNPP has been to set the open limit switches to ~
actuate when the disc is at 964 of full open position unless otherwise specified on the control wiring diagram (reference 2.5). Operating experience has shown that this setting provides for proper flow rate, however, RF03 testing of a sister valve identified that the valve stem was coasting into the backseat.
Thus, a setpoint of 964 may not be adequate and therefore, a setpoint of 90% is recommended (see Attachment A for justification).
1CS-752 Page No: 15
Prepared By: Calc. ZD: *CS-0022 Checked By: Revision: 2 i.8.1 Bases of Limit Switch Set oint Re irements Cont.
Rotor 2 When the valve is given a signal to close, the motor runs in the closing direction until the torque switch is actuated, which stops the motor.
Rotor N2 is wired to provide a bypass around the open torque switch until the valve is unwedged. In addition, rotor 42 provides valve position indication (it turns off the red indicator lamps when the valve is fully closed).
In order to assure proper position indication in the close direction, the close limit switch should be adjusted to valve indicate a closed condition only after the disc has covered the seat. The practice at SHNPP has been to set the close limit switches to actuate when the disc is at the 44 position unless otherwise specified on the control wiring diagram (reference 2.5). Operating experience indicates that 44 from fully closed is adequate to meet the setpoint requirements retained. for rotor N2.
Thus, 4% is an acceptable setting, and can be Rotor 3 Rotor g3 is not used.
Rotor i Rotor g4 provides position indication to the main termination board.
to open It also provides a permissive which allows provided valve 1CS-746 is closed and other valve 1RH-25 conditions are met.
In order to assure proper position indication in the close direction, the close limit switch should be adjustedtheto valve indicate a closed condition only after the disc has covered seat. The practice at SHNPP has been to set the close limit switches to actuate when the disc is at the 44 position unless otherwise specified on the control wiring diagram (reference 2.5). Operating experience indicates that 44 fromrotor fully closed is adequate to meet the setpoint requirements for 44.
Thus, 44 is an acceptable setting, and can be retained.
1CS-752 Page No: 16
Prepared By: Calc. ZD: *CS-0022 Checked Bys Revision: 2 4 '.2 Limit Switch Settin Re irements Limit Switch Rotor 8ettin s In this case, the various limit switch rotors are required to be set as follows:
ROTOR g1: 90% of full open ROTOR 42: 44 of full open ROTOR N3: NA ROTOR g4: 44 of full open The preferred method for setting limit switches is to determine the number of handwheel turns needed for a full stroke, and then to set the switches at the required percentages based upon that.
The total number of handwheel turns needed to stroke the valve may be determined if the stroke length, thread lead, and handwheel ratio are all known.
The total handwheel(HW) turns to fully stroke the valve is calculated as follows:
TURNS~ = VALVE STROKE / THREAD LEAD
- HANDWHEEL RATIO 1.5 inches / .667 inches
- 4.38 9.85 handwheel turns 44 of 9.85 handwheel turns is equal to 3/8 handwheel turn.
104 of 9.85 handwheel turns is equal to 1 handwheel turn.
1CS-752 Page No: 17
Prepared By- Calc. ZD: *CB-0022 Checked By: Revision: 2 4.9 Nomin 1 0 eratin Time o
o erat n ti e is rov de o info atio o s ctual motor RPMs can va with a lied load. With the information provided in section 3.1, the stem nut revolutions per valve stroke and the stem nut revolutions per minute can be determined as follows:
STEM NUT REVOLUTIONS/VALVE STROKE = VALVE STROKE LEAD 1.5 0.667 2.25 STEM NUT REVOLUTIONS/MINUTE 0 OR PM OVERALL UNIT RATIO 1700 94.0 18.09 With these calculated values the nominal expected operating time of this valve can be calculated using the following equation:
STROKE TIME = STEM NUT REVOLUTIONS VALVE STROKE STEM NUT REVOLUTIONS/MINUTE 2.25 18.09 0 '2 MINUTES/VALVE STROKE 7.5 SECONDS/VALVE STROKE This valve has no specific stroke time requirements other than the generic 10 second maximum stroke time required by reference 2.13
'CS-752 Page No: 18
Prepared By:. Calc. ID: *CS-0022 Checked By: Revision: 2 5 ' RESULTS CONCLUSIONS AND RECOMMENDATIONS 5.1 Results and Conclusions
- 1) The actuator torque switch and limit switch ranges shall be established as shown in table 5.1.
TABLE 5.1 BASIC DATA AND SETUP RE UIREMENTS CLOSING THRUST RANGE (POUNDS) OPENING THRUST RANGE (POUNDS)
MINIMUM MAXIMUM MINIMUM MAXIMUM 10,175 12,600 1 800 12 600 RECOMMENDED RECOMMENDED CLOSE TORQUE SWITCH SETTINGS OPEN TORQUE SWITCH SETTINGS MINIMUM MAXIMUM MINIMUM MAXIMUM 182 FT-LBS 225 FT-LBS 32 FT-LBS 200 FT-LBS EQUIVALENT EQUIVALENT CLOSE WORMSHAFT TORQUE OPEN TORQUE SWITCH DIAL SETTING MINIMUM MAXIMUM MINIMUM MAXIMUM 135 IN-LBS 167 IN-LBS LIMIT SWITCH SETTINGS ROTOR ¹1 ROTOR ¹2 ROTOR ¹3 ROTOR ¹4 90% 4% N/A 4%
1 HW TURN 3/8 HW TURN 3/8 HW TURN FROM FULL FROM FULL FROM FULL OPEN CLOSED CLOSED 5.2 Recommendations I
It is recommended that this valve be achievable differential pressure and retested at maximum flow upon completion of PCR-6547. The test results will be evaluated to confirm the setup ranges established in this calculation are acceptable.
1CS-752 Page No: 19
Attachment A Calc. No. 'CS4022 Revision 2 TZLECOM Valve No. 1CS-752 BETWEEN: Page 1 of 1 MECHANICAL ENGINEER CAROLINA POWER 6 LIGHT AND:
MANAGER OF ENGINEERING VELAN INC.
DATE: JANUARY 6, 1992 TIME: 2 35PM SUMECT'" AND SMALLER VELAN GLOBE VALVES MR. STATED THAT 904 OF FULL OPEN STROKE WOULD ALLOW FULL DESIGN FLOW.
Attachment B Calc. No. 'CS4022 Revision 2 Valve No. 1CS-752 Page 1 of 3 V(A FAX Number of pages Including this page: ~~
Please reply by FAX to: Message No.: <'8~8 To,'
Q Head Office and Plant No. 1 (514) 748-8635 Date: I '5 Q Marketing (514) 748-7592 Q Plant No. 2 (514) 341-3032 From: Attention:
Q Spare Parts (514) 342-2311 Q Plant No. 3 (802) 862-4014 Copies to:
Q Plant No. 4 (514) 378-6865 Subject I
Reference:
Attachment B GLOBE VALVE - 2 in Calc. No. 'CS4022 Revision 2 STEM ANALYSIS Valve No. 1CS-752 Page 2 of 3 UT1LITY: CAROLINA POWER AND LIGHT Order no. P9-W.I D.4:
~ 2TM78FNM VALVE DWG: E73-62S Design Temp. 125 deg F STEM DWG. 7913-22 Pressure Class 1500 lb STEM THRD. 1 1/8 - 3 ACME douhle lead STEM MAT. SS 630 A-564 sa = 45950 Psi Code Case N-62-4 STEM DATA dj 0-792 in. root dia of thread 0-917 in. dim. at sec. d2 0 '25 in. dim. at sec. k 0.396 in. rad. d/2 0.016 ft.lb./lb thread. factor al 0.492 in."2 root area of thread a2 0 660 in 2 area of sec. d2 a3 1.224 in."2 area at d2 in shear 0.039 in. 4 polar moment of iner-vS.a at mam zaraaa 0 in. eff. length of stem 0 in. torque arm radius 0.019 in- 4 Moment of Inertia Kr2'd TTE2 2>E PTS 2d Sloyd 32UdS NU lych 9I:ST 26r 88 130
Attachment B Calc. No. 'CS4022 GLOBE VALVE - 2 in Revision 2 Valve No. 1CS-752 Page 3 of 3 STEM ANALYSIS UTILITY: CAROLINA POWER AND LIGHT Order no. P9-M.I.D. 2TM78FNM VALVE DHG: E73-62S Design Temp. 125 deg F STEM DNG: 7913-22 'ressure Class 1500 lb STEM THRD. 1 1/8 - 3 ACME double lead STEM MAT. SS 630 A 564 Sp' 11339'6 Psi Coda Case N-62-4 STEM CALCULATION At Section dl Max Tr 14432 lbs. from Eq. (19)
At Section d2 Max Tr 30347 lbs. from Eq. (20)
At Section k Max Tr 33756 lbs. from Eq. (21)
MAX Thrust/Torque CLOSING OPENING Tr./lbs. Tor./lb-ft Tr./lbs. Tor./sb-xc CONTINUOUS DUTY 14432 224 14432 224 ONE TIME 35616 554 35616 554 ErE'd TTBZ ROE 0'75 Zd SLY 3$ 9dS NU33h ZI:ST 26'8 130
ATI'ACHMENTC
'CS4022, Rev. 2 Page 1 of 1 Test' Tag: iC3-752 3(23/3i 22'49'ii 5000 VOTES SENBOR
-20000 orce = -7884
< Ibs> -<5000
.20000 52997 53097 5%997 55997 55997 57097 SMITCH B SWITCH C SWITCH D 52997 53$ 97 5%997 SSS97 55997 57S97 TiNe in Seconds 55.397 Y-EIIlPND ON 1CS-752: Flow Isolation/Seating Thrust 2730 PSID
ATI'ACHMENTD
'CS4022, Rev. 2 Page 1 of 1 Test: 1 Tag'(3-752 3(23/3i 22'25'4S
.%50 VOTER SENSOR
-%60 orce =
(lbs)
.%80 25209 25309 25%09 25509 25C09 25709 OLS 25209 25309 25%09 25509 25C09 25709 Tiae in Seconds 25.453 Y-NPS ON 1CS-752: Average Closing Packing Load, Static Conditions
ATl'ACHMENTE
'CSEE%2, Rev.2 Page 1 of 1 Test: 4 Tag'(3-752 3(23]9i 22'49'ii l0000 VOVES BENROR Dree = -13432
-25000
( Ib )
-20000 SB0% 55%0% 5550% 556 SP0% 5540%
SWITCH B SWITCH C SWITCH D 55)0% 55'%0% 5550% 556 5570% 5500%
Tin: in Seconds 55.6BB Y-OPS ON 1CS-752, Final Thrust Due to Inertia
ATI'ACHMENTF
'CS-0022, Rev.2 Page 1 of 1 Test' Tag'C8-?52 3/23/3i 22'8'ii
-20000 VOTES SENSOR orce = -iii3i (15s)
.20000 5530't 55%0% 550'f 55601 5570% 5580%
SWITCH A SMITCH B SWITCH C SMITCH D 5530't 55%0% 550% 5560% 5570% 5580'I Time in Secands 55.488 'It'-EXPti ON 1CS-752, Thrust At Torque Switch Trip
Attach)tteai Q Calc. No. eCS~l22 Revision 2
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Attachmeat G Cate. No. 'CS4022 Revision 2
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