ML20128N836

Performance Test Program for Increased Blowdown on Crosby 4M16 HB-BP-86 Pressurizer Safety Valve

ML20128N836
Person / Time
Site:	Davis Besse
Issue date:	09/30/1982
From:	Downing J, Thibault D, Zahorsky J CROSBY VALVE & GAGE CO.
To:
Shared Package
ML20128N812	List: ML20128N807 ML20128N836
References
3992, TAC-44572, NUDOCS 8507260282
Download: ML20128N836 (24)

Text

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, r CROSBY V A LV E S GAGE CO M PA NY C Fl O S B Y J wRENTHAM, MASS TES"' PHOPir 10. 3992 PEPPDMWEE TEST PPOGFA'4 FOR ItX'RFASED BTD?DOh'!! CI CICSBY 4?(6 HB-BP-86 PRESSURIZER SAFETY VALVE TEST"iG PERFORED FOR T2EDYNE D:GINEEREIG SERVICES O:1 CRDS3Y FICIORY ORDER 10. 25358 SA~. "I VALVES SUPPLIED BY 'IOLEDO EDISO! DNIIS-BESSE DATE OF TEST: Ji2E 18 T!!POUG!! 24, 1982 TELEDYNE ENGMEERING EEEE3 COi!TRCLLED 7' DCCUI,iE;1T TESPROJ.NO-l3EE(5bl ~

DATE 7-A2 -#8 PREPARED BY:

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,lSSOCI?sTE Et!GIh APPIOVED BY: .. d/ [fv cc & -J,o -f,Q D. G. THIBAULT PIGEDP D;3INEER WPIOVED BY: *

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MTE: SEl'rD!BER 29, 1982

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Test Paport !!o. 3992 Page 2 TABIE OF CO!7mTTS Section Descrintion 1 Scoco of Test Progran 2 Introduction 3 Test Progra:n - Standard and !bxinua Blowdown Tests 4 Testing Procedure 5 Test Pesults 6 Sumary of Testing O

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J r CROSBY V A LV E & GAGE CO M P ADY CROSBY J wRENTHAM, W A SS

]I r Test Pecort 16. 3992 Pace 3

1. Socoe 1.1 The objective of this test was:

1.1.1 Evaluate the cacability of the Croshv 4:16 8 pressurizer safety valve 3

to achieve a blo.down in excess of 151. 'The tests were mrformed with a set orensure of accroximatelv 1250 osig utilizing a orarated soring.

The test objective was achieved by perfoming tests with the follming adjus mnts mde to the valve.

1.1.1.1 Changes in the adjusting ring setting.

1.1.1.2 Changes in valve soring (lwer spring rate).

1.1.2 Evaluate effect of backpressure on valve cerformance, blowhm and ring settings. Tests were perfor ed on the Crosby Test Facility with both' miniral system backeressure and the maxirum smcified Toledo Edison backeressure prorated lwer to be procortional to the test set pressure of 1250 psig.

1.2 The safety valve used for the performnce testing was sucolied by Toledo Edison

) Davis-Besse and is shw n on Crosby Drawing No. DS-C-59303.

1.3 The testing was per Teledyne Engineering Services, Purchase Order 16. DE 0696, -

(Crosby Factory Order No. 25358) .-

2. Introduction 2.1 The valve mrformance carameter tenmd as blo.down is defined as the difference between valve opening pressure and valve rescat pressure. Blowdown is expressed as a percentage of the valve ooening pressure as defined by NJSI B95.1. .

2.2 All tests were performed using saturated steam on the Crosby High Fim Test Facility which is illustrated in Crosby Bulletin No. 100 (Attached).

2.3 The in-field set pressure of the test valve is 2500 psig. The High Flw Test Facility, however, has the capability of perfoming operational tests for a valve this size at a set pressure of 1350 psig maximn. Therefore, testing was performed with prorated test springs. m ,,,,. 1 ,, g y , a e, 2.4 The Crosby 4:g6 HB-BP-86 pressurizer safety valve is designed with two (2) rings for con _ rolling valve perfontanx. The nozzle ring is the 1mer ring and is threaded on the nozzle to obtain proper pop action of the valve. The nozzle ring requires verv little adjust:mnt after it is initially set. The nozzle ring was not adiusted during this test program. The adiusting ring, t.hich is the upper ring is the principle blowdown control. During this test program the

) adjusting ring was adjusted over a range of intemittent settings and the resulting blowdowns recorded.

3 f CROSBY V A LV E S GAGE CO M P A NY a

CROSBY J WRENTHAM, MAS $

T Test Peport No. 3992 Page 4

3. Test Procra t - Stadrd and ihxi um almdmn Tests 3.1 The tests for mxinzn blowdwn were rnrforned with two (2) dif ferent prorate sorings. Th3 first spring was a procortional ororate to the in-field (final set pressure) spring. The se:-ond soring, which had a lwer load deflection rate (rmnds ocr inch) of aoproxirnately 20 parcent, was used to detemine exact increases i- blodown at sinilar ring settings.

3.2 Tests were cerforred with minimal test systm dynamic back pressure and a dynanic back pressure of aoproximtely 30 oarcent of the valve onening pressure, over a range of adjusting ring settings using both prorate springs.

4. Procedure 4.1 The test valve was mounted on the 300 cubic foot test drum on the Crosbv High Flow Test Facility with the valve outlet connected to the ten (10) inch discharge ploe. (See Figure 3 for test arrangement) .

4.2 The adjusting ring nosition is deterninM frcm the highest locked pontion as defined in Crosby Instruction Manual I-1105. This is achieved by turning the

)- ring counterclockwise (to the right) until it contacts the disc ring.

4.3 A valve ooerational cycle for each selected ring setting was then perforred in

• the following mnner: .

4.3.1 Steam crossure of approximately 1400 psig was mintained in the 1350 cubic foot accu-ulator. A oressure of aoproxim tely 11.50 osig was inserted into the 300 cubic foot test drum. The pressure in the test drum *.ns then increased with steam from the accumulator that is fed throuch the servo-controlled min fed valve until the safety valvo pop w3. Pressure in the test dnrn is permitted to rise until the desired overpressure is achieved, then decayed until the valve rescated.

4.3.2 An oscillographic recorder mnitors the valve inlet pressure (test drum), valve lift and valve outlet pressure. Frcm this graph recording, thc valve opening yressure, overpressure and rescat pressure is obtained. tFo~otiliefdsta was 'r5~c6rd5d~during this test series.

4.4 Testing was cerforned for nach of two (2) prorate springs over a scan of adjusting ring position. and at a minimum test system dynamic back pressure and a dynamic back pressure of anproximtely 30% of the valve opening pressure.

The valve set pressure and no :le ring postion was not adjusted after the test series was initiated.

)

• J r CROSBY V A LV E 8 GAGE CO M PANY

[

CROSBY] wRENTHAM, MASS Test Panort Ib. 3992 Page 5

5. Test Pasults 5.1 Prorate Sori-n No.1666 (Cmshv Test Sorina with Inad Deflection Pate Prem&_ional to Standard Sormq)

Test mdia: Saturated Stean Back Presnire: Crosbv Test Systen tiinirun (Aporoxirately 50-80 psig)

• tbzzle ring oosition: -18 tioninal Valve set Pressure: 1305 psig

• Adjusting Ring Popping Pressure Pascat Pressure B1mdmn Position (psig) fosia)  %

-181 1302 1257 3.5

-191 1304 1231 5.6

-201 1310 1229 6.2

-211 1312 1233 6.0

-231 1307 1213 7.2

-251 1311 1200 8.5

-271 1300 1182 9.1

• • -291 9.6

) -311

-331 1300 1302 1306 1175 1186 1183 8.9 9.4

-351 Note 1 1305 1175 10.0

-361 tbte 1 1306 1176 10.0 *

-381 tbte 1 1306 1157 11.4

-391 tbte 1 1306 1140 12.7

-411 tbte 1 1315 1087 17.3

• All nozzle and adjusting ring positions set per Crosby Instruction tianual I-1105.

• • 03cillographic ree:rder strip charts are attached for this test.

Note 1: Tests at these ring settings for infonnation only and are not recomended "nomal" field settings.

5.2 Prorate (Croshv Snring th.1666 Test Spring with Inad D'flection Rate Pronortional to Standard Soring)

Test tkriitra: Saturated Steam D/namic Back Pressure 29-321 of valve opening pressure.

tbzzle Ring Position -18 tkrJ.nal Valve Set Pressure: 1305.

• Miusting Ring Popping Pressure Pascat Pressure Dlotalown Ponition (nsic) (nsic)  %

-161 1311 1275 2.8

) -171 1317 1260 '4.3

-101 1320 1243 5.8

-191 1304 1221 6.4

J f CROSBY V A LV E 8 GAGE CO M P ANY CROSBY]

WRENTHAM, MASS T

Test Pcport t:o. 3992 Page 6

5. Test Pasults (Continued) 5.2 Prorate Sori c No.1666 (Crash" Test Sorina with Icad D2flection Rate Pronorcional to Standarci Sorina) (Continued)

• Adjusting Ring Pocping Pressure Rescat Pressure Birmbtn Position (osig) (osic)  %

-211 1306 1191 8.8

-231 1298 , 1169 9.9

-251 1296 1181 8.9

-281 1305 1175 10.0

• • -301 1302 1180 9.4

-341 1313 1137 13.4

• All nozzle and adjusting ring positions set mr Crosby Instruction ibnual I-1105.

• • 0scillographic recorder strio charts are attached for this recort.

5.3 Prorate Crof.P Soring t:o. 4642 (Crochv Test Sorina with 20% Tmor inad Diflection Pro to Procortional Strdard Scring)

Test tbdiun: Saturated Steam Back Pressure: Crosby Test Systen Minimu:n (Approximately 50-80 psig)

• llozzle Rina Positions -18 tiominal Valve Set Pressure: 1250

• Adjusting Ring Popping Pressure Pascat Pressure Blowtbin Position (nsig) (osic)  %

-160 1269 1195 5.8

-170 1263 1180 6.6

-180 1268 1181 6.9

-190 1269 1169 7.9

-200 1266 1159 8.4

-220 1270 1151 9.4

-240 1270 1133 10.8

-280 1273 1098 13.7

-291 1249 1081 13.4

-311 1267 1082 14.2

-331 1262 1081 14.3

-351 1255 1075 14.3

-371 tiota 1 1258 1063 15.5

-391 tioto 1 1255 1031 17.8

-411 tiote 1 1252 988 21.1

-431 tbte 1 1252 933 25.5

• All nozzle and adjusting ring positions cet per Crosby Instruction thnual I-1105.

lote 1: Tests at these ring settings for infomTtion only and are not reccmonded "nomal" ficid settings.

0

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- I CROS8Y V A LV E O GAGE COOPA0Y CROSBY]

' WRENTHAM, MA3$

Test Pcport !!o. 3992 Page 7

5. Test Results (Co.tinued) 5.4 Prorate Scrirn No. 4642 (Croshv Tert Sering with 20% Imer Invol D'flection Rate to Prcuional Standard Spring)

Test t'ediu u Saturated Steam D'/nanic Back Pressure: 29-32% of valve opening pressure

• Nozzle Ring Position: -18 1:cninal Valve Set Pressure: 1250 psig.

• Mjusting Ring Popping Pressure Peseat pressure Blowdsn Position (psig) (psig)  %

-160 1262 1179 6.6

-210 1259 1144 9.2

-260 1252 1090 12.9

-310 1256 1079 14.1

• All nozzle and adjusting ring positions set per Crosby Instruction f tanual I-1105.

3. Su rnty 6.1 The test results are plotted in Figure 1 of this recort.

6.2 Based on the plots in Figure 1 for the specific valve design and set pressure, blowdown is a function of:

6.2.1 The spring load deficction rate. .

6.2.2 Mjusting ring setting.

6.2.3 The valve internal geormtry.

6.3 Prorate Crosby Test spring tio.1666 is desictncd to the present requiremelt of 5% naxinum bicwdwn. The test data illustrates that this spring is sufficient to obtain bicnisns in excess of 15 percent. Hwever, this is accomplich x1 by-adjusting ring settings that are not generally nortul for this valve.

With the 29-32 parcent back pressure, the bisdwn increased approxirutely 1-3 percent over those achieved when back pressures were the mininum which could be obtained on the test system.

6.4 The prorate Crosby Test spring No. 4642 had a lower load deflection rate of aoproxirntely 20% than the soring would nomally have for the test pressure.

The test data illustrates that this spring is cambic of obtaining blowdmns in excess of 15 percent.

6.5 With the dynanic back pressure in the range of 29-32 percent, the blowdown is 1 percent loncer than with minitum system back pressure.' In comparison with prorate Crosby Test rpring !!o.1666, the blowdmn is 3-5 parcent longer with the lover load deflection rate spring.

6.6 The increase in valve blowdwn had no adverse offact on valve performnce and

.) the Code lift was achieved.

9

r CROSBY V A LV E S GAGE CO M PA NY CROSBY j WRENTHAM, MASS

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A?UG E"'S I

Attachnent !10. D2scrintion 1 Figure 1 (A, B, C, & D) - Adjusting Ring Position versus Percent Blarb.in 2 Figure 2 - DS-C-59303 Pavision A, Draaing of 4:(6ID-BP-86 3 Figure 3 - Draaing of Test Arranger _nt 4 Crosby Bulletin No. 100 - Crosby Test Facility 5 Oscillographic Pocorder Strip Charts (Twa (2)

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17. Dyncmic back pressure

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4. CROSBY.IDE silencer 19. Dischcrge line -

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olc i n g e a ve t 7. Servo controlled low feed bypass volve

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1. Boiler 4

2.1350 cubic foot steam 9. Control room accumulator 10. Hydtcuhc power unit e3.300 cubic foot test drum

11. Steam control volve

12. 4 inch meter tube

13. e inch meter tube

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2. Valve being tested High pressure loop ASME. accepted

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3. Water storage tank 10. Triplex pumps. 30 hp. 40 hp 3

4. Bypcss controlvalve 11. Accumulctors 20. 60 hp pump '.,

P. . Meter tube 12. Meter tube 21. Dischcrge line 6.125 hp motor 13. Test drum '

Hydrostatte test loop

7. Controlvc17e 14. Valve being tested

22. Hydrostatte test stands

8. Accumulctors Carbon steel centrifugalloop 23. Hydrostatic test bench

9. Discharge hne (open) 15. Meter tube g

16. Test drum W

17. Valve being tested

18. Bypass valve ,

19. Water storage tank

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9 CROSBY ASME. ACCEPTED TESTING LABORATORY (WATER) i l

For flow testmg on water Crosby has. cs c p::: c!:ts test mplex. : rr-plete water flowlab rc:Or/ c:cepted ry tne Arnencan 5:=et/ :: Me-en=n:::1Engmeets Tnelaccrmerie:nsis:s e:tw:: .nerence '::cw lo ps Tne!:rstis alowpressure10 p.3% ps:; max: mum utd:=n; 30:

i gpmcentnfugalpump cnd c 13D eub::::::: nr. Tne se::nd u a n:g:

pressure loop (3.000 psi):nclud:ng two re=proommg pumps prOv:cm; i

10 and 20 gpn respeenvely. cn g'T c comb ned!iow : 30 g;m to i >/ test sicns. Elad er ripe cetumu-I " 'i: -

} Ict rs pernut mstantaneous flows to 100 gpm

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1 CROSBY INSTRUMENTATION AND EEUIPMENT 9

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Complementing our multi-million dollar fluid test complex is c 00mprenensive in3m

men:ction

! capabihty !ct use in any one ot the three laborc:enes Tne ins:rumen: tion mecsures and re:-

i orcs flow. pressure. temperature.!Orce cnd disp;ccemen* A scmplm; c: ecu:prnen: cycdc-l ble meluces c 32-channel progrcmmable dc'c logger v.!n pn . out. d:g::c. me:ers ::: manl-l 10nng tempercture cnd pressure. xy cnc xyy re:Orcers :Or grcpnic re:Crcm; c: tes: pcic-

meters. cual-trc;e mult1.!unct10n oscilloscope. me ncnica. pressure ...~. .g cr. re

Oram; I gages trcceable to the Nationc! Bureau c Stancarcs. and c m::roprc essor :or rcp;c recu tion j computation ot data dunng testmg.

I Available for analyticcl work is a five-termmci ccmputer (w:th plotter) w:th mo cem cllow-l Ing communication with a larger computer. Pr7 grams used 10r s:ructurci cnclys:s cre ANSYS.

I NASTRAN cnd STARDYNE.

l Also complementmg the test Ocmplex is c steam test l

laborator'/ housmg c 500 cubt:100 ccoumulcior' test i

drum and instrumentatio . :cr equ:pment testmg with i [ pressures to 1.550 psi. Avcper pc xcge-type bouer pro-

[E vides steam ci pressures to 3.000 pst with cpprepncte i cecumulators/ test crums.

l At the cpposite pressure extreme c portable vccuum g test stand prov;ces test flows to 2000 SCFM ct 31nches c i - mercury. A mcss spectrometer (helium leak detector)

I having a sensitivity of 5 x 10 Atm. c:/second is clso l -

w available for component leck testmg. .

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Whatever your service conditions or process pcrc-meters, chances are that Crosby has the instrumentation i

yff to satisfyyour test needs. .

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! Crosby Valve & Gage Company,43 Kendrick Street, 1 P.O. Box 308, Wrentham, MA 02093 U.S.A. (617) 384 3121

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