ML18047A446
| ML18047A446 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 10/14/1981 |
| From: | COPES-VULCAN, INC. |
| To: | |
| Shared Package | |
| ML18047A442 | List: |
| References | |
| NUDOCS 8207160340 | |
| Download: ML18047A446 (8) | |
Text
P.O. BOX 577 LAKE CITY. PENNSYLVANIA 16423 PHONE 814 I 774-3151 October 14, 1981 Rev. 1 JUSTIFICATION REPORT Power Operated Relief Valves Supplied to PWR Plants Prepared by Q.de....c. ~
Reviewed b~
~ \\~
Approved by TELEX: 91-4414
- 1.
Introduction All power operated relief valves supplied by Copes-Vulcan have been globe style valve bodies (model D-100).
The actuator supplied in all cases is a reverse acting, diaphragm opera.tor (model D-100-160).
Refer to attached Drawing SK-A-13529-L, Rev. o, for a complete listing of valve designs, applicable utilities, a.nd quantities used in domestic PWR pla.nts.
- 2.
Description of the Ba.sic Valve Model The basic valve is a. 3-inch ca.st or forged straight through valve body. All valves have a bolted style body-bonnet joint with a. centering feature having a metal-to-metal shoulder to control gasket deformation.
The spiral wound 304 SS asbestos gaskets a.re completely trapped in the valve body and compressed a precise amount as required by the design.
All PORV's supplied utilize an air-loaded reverse-acting operator.
In a reverse-acting opera.tor a large compression spring provides the seating force to the stem and plug.
Air pressure loading the diaphragm chamber will overcome the spring force, thus stroking the valve.
The most important subassembly of a. control valve is the trim.
The trim supplied for all, PORVYs is unbalanced, single seat, plug throttling.
This trim modulates with a plug that ha.s a contour on its lower end.
The motion of the plug varies the annu1a.r flow clearance between the plug and cage, a.nd hence the flow.
The cage is a cylindrical spool piece surrounding the plug.
It has a number of flow ports, which uniformly distribute the flow a.round the plug a.nd also serve as a massive plug guide.
The ca.ge also carries the sea.t joint. This combination of.,cage,*
ca.ge spacer, and plug provides four principal a~varitages:
A.
Stable throttling at any pressure'drop; B.
Reduction in side load and friction due to the uniform flow distribution through the ports;
- c.
Longer seat life by eliminating chatter at low lifts and by uniform flow distribution through the seat orifices; D.
Ease of maintenance due to quick change design.
Prior to 1971 the valves were constructed using a. 2:i
~ 1500 lb.
ca.st ~ralve body with 3" weJ.d end expanders, after 1971 the valves a.re constructed using a. forged 3-inch class 1500 weld end valve body.
These two designs a.re described en the attached tY?ical Drawings L-143844 a.nd D-176615.
- 3.
Selected Test Valves The 3-inch valve body of the test valve would experience the larger effects of thermal cycles as compared to the smaller 2-inch valve bodies.
It is thoroughly described on the attached drawing D-166075.
The initial testing will be performed with the originally supplied 17-4 PH plug and cage.
A second set of testing will be performed on the 316 SS stellited plug with the 17-4 PH cage.
The thick walled cage spacer will be tested along with the 316 SS, stellited plug.
- 4.
Design Variations Between PWR Plant Valves and Selected Test Va ves There are no design variations between the PWR plant valves and the selected test valves.
Two valve designs were supplied to the industry, thus two valve designs are being supplied for testing.
The two designs have the following:
Dissimilarities - Valves supplied prior to 1971 and tne issuance of the ASME Pump and Valve Code were constructed using a 2-inch/1500 lb. cast valve body with 3-inch weld end expanders (forced) and the valve trim materials consisting of 17-4 PH condition H-900 for plugs and 17-4 PH condition H-1100 for the valve seats.
Subsequent valves were supplied using a 3-inch Class 1500 forged weld end valve body, 316 SS stellited plug and the valve seat remained 17-4 PH condition H-1100.
After May 1981, a design improvement was made by increasing the wall of the cage spacer from 1/4-inch to approximately 3/4-inch. It is believed this thick walled cage spacer will provide greater stability during rapid high temperature transients.
Similarities - All valves supplied have the same:
A.
Valve seat material B.
Valve seat throat diameter.
- c.
Travel D.
Actuator size and style E.
Pressure and temperature rating F.
Flow capacity
- 5.
==
Conclusion:==
The selected test valve along with the two trim combinations represent the Copes-Vulcan valves installed or to be installed in PWR plants and the EPRI test results are fully applicable to the Copes-Vulcan valves installed or to be installed in PWR plants.
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NOTES:
- 1. FOR MINIMUM Cv OF 50, SET VALVE STROKE AT '3/-4 IJICllD.
. z. MAXIMUM TEMPERATURE ~so °F.
- 3. AIR PRESSi:RE IN THE DIAPHRAGM CHAMBER MUST NOT EXCEED 100 P. S. LG. TO Pltl:tEM'i" COMPONENT DAMAGE.
- 4. STUD MAT'L - '!i."ttra\\..
-'"E.TM-~\\ 93 GR B, NDT MAT'L-STE:E\\.. l\\STM-l'\\l':t4 GR ?H
- 5. Cu;AN FINAL ASSEMBLED VALVE IN ACCORDANCE WITH C.
V. PROCEDURE
I. I. ICM.
- 6.
~ '
CLK-'RA..T>l'CE FOli REVERSE ACTION.
?.
g CLEARANCE FOR REMOVAL OF OPERATOR.AND INTERNALS.
- 8. RECOMME.rt'DED SPARE PARTS t.RE MARKED WITH AN ASTEF.!SX (*) ON THE an.I-or lllATl:mAL.
IN ADDITION TO THE ITEMS MARKED (*) A DIAPHRAGlll (CVD PART *
@J::) er'5
) II RECOMMENDED.
- 9. REQUIRED AIR PRESSURE INPUT FOR SHUT OFF OF BACK SEAT= 'e:) P.S.I.G.
- 10. REQUIRED AIR PRESSURE INPUT TO BEGIN LIFT OF PLOO FROM MADf SEAT= C:.f P.S.LG.
- 11. BONNETMATER!AL-<::.RES-A~TM-A~'"!>I
<:.~. C.F8~
BUSHING MATERIAL - STELLITE H 2 _c,92:!.01on1A DE.1 AIL,. f\\
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- REVERSE ACTING.
-IN.
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5°'sCH.160 BUTT WELD ENDS SEE DETAIL 'A' ACTUATOR DETAIL Allt FA.. TER REG.
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PO* DESIGN CY OP IO. HT l'ALYE AT I/I 111, I.
- AZ'llUJll Tl:llPrllA.~u*E ~*-
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&I* PREHU*E '"Tai: Dl&P**AGll c****I* llU8T MOT EJICISD 110 P.a.1.0.
TO P&l:YEJIT COllPOM.ENT DAii.AGE.
.. Jf 1/11 LO, CAD *.,LAT*D I/I
- II UNC ll' 1-1/r LO.
111 - ae. v*c 1/1"' IC*. U PIPI 111 - u owes 1-111 1.CJ.
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1/1 - 11 UJIC JI 1-1/I LO, a1co11*1:*DED IPA~I: PAii.Ti *** llAll&"l:D *IT* **
- OJI *ILL OP MATERIAL.
I.
DOVIRED.ua Plll:Hu*s TO BEGIW LIFT or PLDC P*o* llAllf llAT. II **** 1.0.
- A:zt*v* &lit TO o;i:*ATI....... 1.c.
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WIWl*UW WALL *..,.* IJI.
I.
.&LL Dl*EJl810Jfl ARE IN IHCll'l:S AJfD Alli lllPl:Jll:R'CI: UWLISS OTll'l:RWlll
!IPICIFll:D *Y TOLP.RAJICI:.
DlllEll910Mll IM' (
) ABE JllLLlll"ITEll !'OUIVALIWTI,
- tz. (11 *r*c;* or PACllUNG Ami: TO BE UJIDI* T*I LAMTr** arwo AJllD T****,.,
&*OYI:.
a1oma1:D *** PRE81Ulll: lHPUT TO HUT orr aACllllAT........ 1.0.
Pm STSTl:ll M"t'Glt03Tal1c TtSTI TM( ACTUATOR lf'lll*..
-COtlNElllC. WILL MOUllll 9!: -NMUSTIRllT, SO THAT TtW ltf:QUlllUI AHi F'M:SSUAE llllPUT TO :'UINRAGll CM&adOt "YQ KAI Lin 0# Pl.Uc;; JltOll..... IUT*,., ~SIS. MTU HTDltO nn llCJft *s....... 111..
I STMSS REVIEW
~
c;~::J-ll'ULCAN,lllC.
,,,_on.-~-.**&
- MODEL 0-100-160 ACT
- l9CLASS 155 VALVE ASSEMBLY ASME CODE CLASS-I anislll;
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CL[AltANC[
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REYEJtS[
ACTIOI CL[liUU.NCC FOR REMOVAL OF' OPEftATOR AND INT[JtNALS 3* SCH. 160
!UTT WELD ENDI IEE DITA IL. 'A' 1* CONDUIT O~NINC FD*
WIRING TO [ACM LIMIT SWITCM I
2C~6 NAME PLATE p:co IOUNOIO -WI:
-o;-f :+:*:.:*~.
l-J-V[NT V[NT
~** 0.D. TUISINQ UlltLI FIELD flUN CNYM) NOT VALVE llOUllTED INSTALLATtc>ll SCHEMATIC DETAIL 'A' 11 WUN, r rl--ao 0raf
.005
-4.190° 1~
- I DIA.
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'N' STAMP PLATE IDENTIFICATION PLATE LG.
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- 10 41377 HEX M!) ClP SCREW STEEL COM'L 30 I
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L DIAPHRAGM IU!BER COM'L BUN.ti,..
31 12 41390 HEX,..UT S"!'EEL COW'L
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I 80813
....BASE C STEEL A!S! ICOB-1010 137259 "L
DIAPHRAGM PLATE t;STE'EL AISI 1008*1010 34 80849 s
SPRING GUl~E CSTEEL AISI 1008-1010 vz* SCli 40 P-~l""----l 35 80947 36 137610*C.
s SPACER tSTE i.. ASTM A*IZO PRING ADJUST NUT C.l ON
"'TM*A 48 CL.. 35 37 I
137611 SPRING ADJUST SCA I
137s.81 s
133452 IS\\IDICATOR....
40 4
4373 MEX HO. CAP SC".
42 4
1898 LOCI!: WASHER 43 2
68578 44 I
778*5 45 2
S~71 46 12'!1209*R
- 7 137608*R 4S 139391 I,. 4T CTES:
l FOR NNllUll C. OF 57, SCT VALVE AT 314 llllC1CI.
- z. llAXI..... T[llF[Ra:n.. RE 650 *F.
1
.a.,q PP[SSIJA[
1111 TH[ OIAP'tf'Mall CH~ lllUST NOT EXCEED 100 P$J.G, TO PlllCVENT co.-.oc*T QaMIGI:,
4 5... "'° lllAT'i...
~ lltttOMWEN>ED SPARE PllRTS ARC M1111M1D Wint M A51'£MSIC90 ON BILL Of' NATEfUL
._ "£QUIRED.t.lfll PAESSU1'£ "'fl'UT TO llEGHll Llf'T OF ~U& ntOM M.UI SEAT* itl P.'IJa
- 7. -...x.. uw AIR TO CPE1tATE
- 85 P.SJ.6
&. *lNBllU.. 'A'ALL. 0.591*
- 9..l.-i.. D"NSICNS A.R£ IN INCHES A~ A.lit[ fllCF'EJIEHCE LN..[55 OTHEltWISE SP'EC1F'1CD e"'t' TOl.[fllAllCE.
IQ E~ET, MAT'L. - CS:tES, ASME*S.0.192 G!3. F-316 W¥LE MAT'L.- i/2MSCl'l.BO PIPE,C,.ES,ASME-54312, iY'PE TP*316 s.u:KSt:AT MAT'L.- STELL1TE NO. 6
- 11. S:I (6J RINGS OF PACKING ARE TO!El..WDER THt: LANTEMil RING ANJ THME(3) ABOVE.
12.. P.EQUIAED AIR PRESSURE INPUT TO SHUT OFF MCKSEAT*OSP.SlG.
11 Ot.I RfVERSE ACTING U,..ITS, OIAPH~AGM PLATE !ITEM 33) MUST 1!1£ ATTACHED TO
"'A.Ill[
':TEW 4Sl WITH SCRCWS (ITEM 401 ANO SP4CERS (ITEM 35), OH DIRECT ACTING
- UNITS,
- >'APliR~GM PLATE IS A.TTACliED TO VOICE (ITEM 471 t!IY THE SAME METMOO.
f4. *l'tEN ASSEMBLING ITEMS 58 ANO IT USE CRANE COMPOUND 425A, CVI P4AT NC. 95123,
- 'fli
'!"!otREAOS.
- 15. '!tGliTEN SCREWS, ITEM 4S TO
?O Lt!IS. l='T.
Of TORQUE~
IS EYE BOLTS TO BE 110* APART.
DRY WT.:
~ 3'5 L.t!IS APP"IOI OPEfll MOOE: RE'iERSE ACTING MODEL D*I00-160 OPER.
VALVE ASSEMBLY
83 - CROSBY VALVE AND GAGE COMPANY