5500

2

The Company

About Nacional-BS&B.One of the most expansive markets to be found in the world today revolves around protecting industrial processes from the dangers of overpressure. Within this industry dedicated to preserving life and property from catastrophic damages, you’ll find Nacional-BS&B, the world leading supplier of overpressure relief devices including safety valves, buckling pin valves, and rupture disk devices.

Nacional-BS&B reigns as the only supplier of a “total solution approach” for overpressure relief needs. Nacional-BS&B is the only manufacturing group that produces every overpressure relief devices known to mankind. If it exists, we manufacture it. If it doesn’t exist, we’re equipped to build it, using a customized engineering products group dedicated to this process.

Both Nacional and BS&B are established companies with decades of overpressure protection experience. Nacional has been designing and producing safety valves according to most recognized international standards for over four decades. BS&B has proven itself as the leading manufacturer with a comprehensive portfolio of products and services that meet and exceed rigorous industry standards for quality and reliability. With a history that spans greater than eight decades, BS&S’s integrated solutions have been time tested and fine-tuned to deliver maximum value and greater efficiencies to individual engineering processes.

Strategic Alliance.As part of a new strategic agreement established in 2017, BS&B offers spring-loaded pressure relief valves manufactured by Nacional under the combined Nacional-BS&B branded name. Nacional will also distribute a portfolio of overpressure relief devices manufactured by BS&B including rupture disk devices, explosion vents, flame arresters and breather vents. Both manufacturers bring unique technological and operational expertise to the table, which through collaboration, allows both BS&B and Nacional to offer the most advanced overpressure relief products to the market on a global basis.

About BS&B Pressure Safety Management.BS&B Pressure Safety Management is a safety company dedicated to protecting industrial plants and personnel from the dangers of overpressure, explosion and fire propagation. The company’s rich history spans more than 125 years with the BS&B name being well known for its innovative solutions for personal and property protection against dangerous over pressurizations and explosions within industrial settings. BS&B offers a comprehensive portfolio of products and services that meet and exceed rigorous industry standards for quality and reliability. Our integrated solutions have been time tested and fine-tuned to deliver maximum value and greater efficiencies to individual engineering processes.

About Válvulas Nacional.VALVULAS NACIONAL, S.A. was established in Spain in 1976. The main target was to provide safety relief valves to the petrochemical and chemical industries emerging in Spain at that time.VALVULAS NACIONAL, S.A., has been designing and producing safety valves according to most recognized international standards and certifications: API 526 & 527, ASME B16.34 & ASME VIII DIV. 1, NB “UV” Stamps, ASTM and the European Directives 2014/68/EU (PED), PED Module B+D, 24/34 EU (ATEX), TR – CU, GOST U, and GOST TDS.. The production process is accredited by an ISO 9001-2008 certification.

Strategic Alliances Worldwide

3

• GENERAL FEATURES 4

• CODIFICATION SYSTEM 5

• PART LIST 6

• BILL OF MATERIALS 7

• ACCESSORIES 8

• GENERAL DIMENSIONS 9

• SAFETY VALVE MAIN COMPONENTS 10

• TECHNICAL INFORMATION 10

OPERATING CHARACTERISTICS TABLE 10

GASES DISCHARGE FLOW 11

STEAM DISCHARGE FLOW 12

LIQUIDS DISCHARGE FLOW 13

• DEFINITIONS (EN ISO 4126-1) 14

Index

4

CODES AND STANDARDSValves have been designed and manufactured in compliance with the following directives, codes and standards:

SIZES AND RATINGSStandard sizes and ratings:

NAMEPLATE EN ISO 4126-1

European Directive: 97/23/CE (PED)

European Directive: 94/9/CE (ATEX)

Design: EN ISO 4126-1/ASME VIII DIV.1 / AD 2000-Merkblatt A2

Certifications: PED MODULE B+D / AD 2000-Merkblatt A2

Pressure and Temperature Limits: EN 1092-1 & ASME B16.34

Tests: API-527 & ASME B16.34

Quality system: EN ISO 9001:2008

Materials: EN & ASTM/ASME

ASME:

Sizes: ¾”x1¼” up to 6”x10”

Rating: 150# up to 300#

EN/ISO:

Sizes: DN-20xDN-32 up to DN-150xDN-250

Rating: PN-16 up to PN-40

General featuresThe model 5500, is an angular type safety valve at 90º between the inlet and the outlet connections, with flanged connections, semi nozzle, direct action and spring loaded. It is designed with the same trims to work with gases and vapours or liquids.

DESIGN• Valve body is angular type at 90º between inlet and outlet flanges.• Simplicity of construction, resulting in a valve with high reliability and easy maintenance.• Self-aligning disc system with guide separated from the valve body, resulting an excellent tightness after valve opening.• Springs are designed using a tested and highly reliable calculation software and manufactured with the ideal material qualities for the

process conditions, ensuring elasticity and accurate repetition of valve opening.

• This catalogue reflects standard valves. Upon request, our technical department can design special applications.

• The safety valve is an automatic direct acting accessory whose function is to relieve excessive overpressures for the applications and installations it protects. Its main characteristics, allow sudden fluid discharge with complete and fast opening (pop).

• Automatic valve opening is produced by of the additional lift provided by the overpressure of the fluid itself helping to overcome spring resistance. Once the installation has recovered its normal service condition, the valve closes again.

INSTALLATIONCleanliness in installation is essential for a successful valve operation. Remove all foreign materials and if possible blow away pipelines and connections on the inlet side of the valve.

Mount the valve in a vertical upright position and keep inlet and discharge piping as short as possible. No stop valves may be located between the vessel protected and its pressure relief device, and the inlet piping shall have at least the passage area of the safety valve.

The discharge pipe size will never be less than valve outlet, and a drain should be provided to avoid condensate accumulation.

Prevent strain on valve body and outlet flange by supporting the discharge piping.

5

1st DIGIT: Valve model

2nd DIGIT: Inlet nominal size

A: DN 20 G: DN 80

B: DN 25 H: DN 100

C: DN 32 I: DN 125

D: DN 40 J: DN 150

E: DN 50 K: DN 200

F: DN 65 L: DN 250

3rd DIGIT: Outlet nominal size

(Same 2nd Digit)

4th DIGIT: Inlet rating

1: PN 16

2: PN 25

3: PN 40

4: 150 #

5: 300 #

X: OTHERS

5th DIGIT: Outlet rating

(Same 4th Digit)

6th DIGIT: Material

7th DIGIT: Standards accessories

X0 Packed Lever

X1 Test Gag

X2 Packed lever + Test Gag

X3 Open Bonnet

X4 Open Bonnet + Test Gag

X5 Open Bonnet + Test Gag + Packed Lever

Y4 Plain Lever

Y5 Plain Lever + Test Gag

Z4 Inconel X-750 Spring

W1 Open bonnet + Packed lever

W4 Nozzle with "Stellite"

W5 Disc with "Stellite"

Codification system

55 A B 1 1 A -1st 2nd 3rd 4th 5th 6th 7th

6

Part listCONVENTIONAL VALVE PLAIN LEVER

PACKED LEVER

12

30

14

2

4

6

17

5

8

24

23

10

15

11

3

7

18

29

9

13

25

28

1

71

70

72

42

56

57

60

61

51

54

30

5952

55

53

7

Bill of materials

CLASS A B E U

ITEM DENOMINATION -20 to 450 ºF 451 to 752 ºF -450 to 472 ºF -20 to 649 ºF

1 BODY 1.0619 1.0619 1.4408 0.7043

2 BONNET 1.0619 1.0619 1.4408 0.7043

2a OPEN BONNET 1.0619 1.0619 --- 0.7043

3 CAP 1.0619 1.0619 1.4408 0.7043

4 NOZZLE 1.4006 (3) 1.4006 (3) 1.4401 1.4006 (3)

5 DISC 1.4006 (4) 1.4006 (4) 1.4401 1.4006 (4)

6 DISC HOLDER 1.4006 Annealed 1.4006 Annealed 1.4401 1.4006 Annealed

7 ELASTIC RING 1.4401 1.4401 1.4401 1.4401

8 GUIDE 1.4401 (8) 1.4401 (8) 1.4401 1.4401 (8)

9 STEM 1.4021 (5) 1.4021 (5) 1.4401 1.4021 (5)

10 SPRING 50CRV4 C.S. H21 T.S. 1.4401 (1) 50CRV4 C.S. (9)

11 ADJUSTING SCREW 1.4021 (4) 1.4021 (4) 1.4401 Nitrided 1.4021 (4)

12 ADJUSTING SCREW NUT 1.4401 1.4401 1.4401 1.4401

13 SPHERE 1.4021 (6) 1.4021 (6) 1.4401 (2) 1.4021 (6)

14 FRICTION WASHER 1.4401 1.4300 1.4401 1.4401

15 SPRING BUTTON C.S. Zincate C.S. Zincate 1.4401 C.S. Zincate

17 LOCKING RING 1.4401 1.4401 1.4401 1.4401

18 RING 1.4401 1.4401 1.4401 1.4401

23 STUD 1.7225 1.7225 1.4307 1.7225

24 NUT 1.1181 1.1181 1.4307 1.1181

25 PLUG C.S. Zincate C.S. Zincate 1.4305 C.S. Zincate

28 PLUG GASKET Compressed Fibers Graphite Compressed Fibers (7) Compressed Fibers

29 GUIDE GASKET Compressed Fibers Graphite Compressed Fibers (7) Compressed Fibers

30 CAP GASKET Compressed Fibers Graphite Compressed Fibers (7) Compressed Fibers

43 PIN C.S. C.S. C.S. C.S.

51 LEVER CAP 1.0619 1.0619 1.4408 0.7043

52 LEVER STEM 1.4021 (5) 1.4021 (5) 1.4401 1.4021 (5)

53 NUT C.S. Zincate C.S. Zincate 1.4401 C.S. Zincate

54 NUT 1.4401 1.4401 1.4401 1.4401

55 CAM 1.4404 1.4404 1.4404 1.4404

56 LEVER SHAFT 1.4021 (3) 1.4021 (3) 1.4401 1.4021 (3)

57 PACKING BRAID GRAPHITE

59 LEVER C.S. Zincate C.S. Zincate C.S. Zincate C.S. Zincate

60 NUT C.S. - DIN 934 C.S. - DIN 934 1.4301 C.S. - DIN 934

61 PACKING GLAND C.S. Zincate C.S. Zincate 1.4401 C.S. Zincate

70 OPEN LEVER CAP 0.6025 0.6025 - 0.7043

71 OPEN CAP LEVER C.S. Zincate C.S. Zincate - C.S. Zincate

72 OPEN CAP SHAFT 1.4021 (5) 1.4021 (5) - 1.4021 (5)

(1) Inconel X-750 material for T>572ºF(2) Nitriding surface treatment(3) Quenched and Tempered HB 220 ÷ 280(4) Quenched and Tempered HB 350 ÷ 400(5) Quenched and Tempered HB 240 ÷ 300

(6) Quenched and Tempered HRC>50(7) Graphite material for T>450ºF and T450ºF

8

PACKED LEVER

TEST-GAG

HEATING JACKET

Accesories

9

General DimensionsOrifice

(ø inch) Rating Inlet OutletFlow Area

(in2)General Dimensions (in) Standard Lever

A B C E F Weight - (lb)0.71

0.7043 (D.I.) PN16÷25÷40x

PN16DN20 DN32 0.394 3.35 3.74 11.57 3.54 13.35 16.1 17.61.0619 (C.S.)

1.4408 (S.S.)0.91

0.7043 (D.I.) PN16÷25÷40x

PN16DN25 DN40 0.643 4.13 3.94 13.54 3.54 15.31 22.9 24.51.0619 (C.S.)

1.4408 (S.S.)1.14

0.7043 (D.I.) PN16÷25÷40x

PN16DN32 DN50 1.025 4.53 4.33 15.59 3.54 17.56 29.1 30.91.0619 (C.S.)

1.4408 (S.S.)1.46

0.7043 (D.I.) PN16÷25÷40x

PN16DN40 DN65 1.666 5.51 4.53 18.86 3.54 20.83 39.5 41.01.0619 (C.S.)

1.4408 (S.S.)1.85

0.7043 (D.I.) PN16÷25÷40x

PN16DN50 DN80 2.689 5.91 4.72 22.09 3.94 24.06 54.7 56.91.0619 (C.S.)

1.4408 (S.S.)2.36

0.7043 (D.I.) PN16÷25÷40x

PN16DN65 DN100 4.382 6.69 5.51 26.85 4.72 28.82 89.3 91.91.0619 (C.S.)

1.4408 (S.S.)2.95

0.7043 (D.I.) PN16÷25÷40x

PN16DN80 DN125 6.848 7.68 6.30 28.82 4.72 31.18 96.6 99.61.0619 (C.S.)

1.4408 (S.S.)3.74

0.7043 (D.I.) PN16÷25÷40x

PN16DN100 DN150 10.986 8.66 7.09 35.28 5.91 37.64 213.2 217.81.0619 (C.S.)

1.4408 (S.S.)4.17

0.7043 (D.I.) PN16÷25÷40x

PN16DN125 DN200 13.679 9.84 7.87 39.21 5.91 41.97 274.5 280.61.0619 (C.S.)

1.4408 (S.S.)4.92

0.7043 (D.I.) PN16÷25÷40x

PN16DN150 DN250 19.022 11.22 8.86 45.63 5.91 48.39 342.8 352.31.0619 (C.S.)

1.4408 (S.S.)

(D.I.) Ductile Iron (C.S.) Carbon Steel (S.S.) Stainless Steel

EC

A

B

F

10

Safety valve main components

Technical Information / Operating technical characteristics tableSAFETY VALVE MODEL 5500

SERVICE GAS LIQUID DISCHARGE COEFFICIENT(at 10% of overpressure) (1) (2) Kd 0.90 0.70

BLOWDOWN MAX. -10% (4) -20% (5)

MIN. -5% -10%

SUPERIMPOSED BACK PRESSURE (3) MAX. 10%

BUILT-UP BACKPRESSURE (3) MAX. 15%

SET PRESSURE TOLERANCE (6) ± 3%

MINIMUM SET PRESSUREASME VIII Div.1 (psi) 14.538

EN ISO 4126-1 (psi) 7.25189

(1) or 1.45 psi, whichever is greater(2) Coefficient certificated at the Laboratorio Politecnico di Milano(3) Maximum allowable backpressure without overpressure exceeds 10%(4) or 2.90 psi, whichever is greater(5) or 8.70 psi, whichever is greater(6) or ± 2.18 psi, whichever is greater

ADJUSTING SCREWCAP

NUT

SPRING BUTTON

STEM

SPRING

GUIDE

BONNET

STUDS

NUTS

BODY

DISCDISC HOLDER

NOZZLE

11

Technical information / Gases discharge flow / Capacity chart - Air

Values used in formulas

Flow SCFH Temperature 59º F

Overpressure 10% (*) Atmospheric Barckpressure Orificies Area in2 ø0.71 ø0.91 ø1.14 ø1.46 ø1.85 ø2.36 ø2.95 ø3.74 ø4.17 ø4.92

psig 0.39 0.64 1.02 1.67 2.69 4.38 6.85 10.99 13.68 19.02

7.11 8228 13444 21436 34856 56186 91642 143166 229722 286014 397749

14.22 10594 17340 27581 44885 72360 117986 184378 295866 368367 512239

21.33 12960 21189 33761 54914 88534 144366 225555 361975 450686 626694

28.45 15327 25073 39906 64908 104743 170746 266767 428084 533004 741184

35.56 17940 29276 46651 75891 122401 199528 311758 500303 622880 866198

42.67 20518 33549 53431 86909 140199 228557 357067 573016 713427 992095

49.78 23131 37822 60212 97928 157963 257550 402411 645729 804009 1118027

56.89 25744 42060 66992 108981 175761 286543 447719 718477 894556 1243959

64.00 28358 46333 73772 119999 193560 315572 493063 791190 985103 1369856

71.12 30971 50571 80553 131017 211358 344565 538372 863938 1075650 1495788

85.34 36162 59117 94149 153089 246920 402587 629025 1009399 1256743 1747652

99.56 41389 67628 107710 175161 282517 460609 719678 1154860 1437872 1999481

113.79 46580 76138 121271 197197 318115 518631 810295 1300321 1618966 2251310

128.01 51807 84649 134831 219269 353676 576618 900948 1445783 1800059 2503174

142.23 57033 93160 148392 241340 389274 634640 991601 1591244 1981188 2755003

156.46 62224 101671 161953 263377 424871 692662 1082253 1736670 2162282 3006868

170.68 67451 110182 175514 285448 460433 750684 1172871 1882131 2343376 3258696

184.90 72642 118728 189075 307520 496030 808706 1263524 2027592 2524504 3510561

199.13 77869 127239 202636 329592 531627 866728 1354176 2173053 2705598 3762390

213.35 83095 135750 216232 351628 567189 924715 1444829 2318514 2886692 4014219

227.57 88287 144260 229793 373700 602786 982737 1535482 2463975 3067821 4266083

241.80 93513 152771 243353 395772 638383 1040759 1626099 2609436 3248914 4517912

256.02 98740 161282 256914 417808 673945 1098781 1716752 2754897 3430008 4769776

270.24 103931 169828 270475 439880 709542 1156803 1807405 2900359 3611137 5021605

284.47 109158 178339 284036 461951 745140 1214789 1898058 3045820 3792231 5273469

355.58 135220 220929 351875 572239 923055 1504864 2351286 3773125 4697769 6532684

426.70 161282 263483 419680 682562 1100970 1794939 2804515 4500396 5603273 7791899

497.82 187344 306072 487519 792850 1278885 2085049 3257708 5227701 6508812 9051115

568.93 213407 348662 555323 903173 1456836 2375123 3710936 5955007 7414350 10310330

640.05 239469 391251 623163 1013460 1634751 2665198 4164165 6682277 8319854 11569545

711.17 265531 433841 691002 1123783 1812667 2955273 4617393 7409583 9225393 12828760

𝐴𝐴𝐴𝐴 = 𝑊𝑊𝑊𝑊

𝐶𝐶𝐶𝐶 ∙ 𝑃𝑃𝑃𝑃 ∙ 𝐾𝐾𝐾𝐾 ∙ 𝐾𝐾𝐾𝐾1 ∙ 𝐾𝐾𝐾𝐾2∙ �𝑍𝑍𝑍𝑍 ∙ 𝑇𝑇𝑇𝑇𝑀𝑀𝑀𝑀

𝐴𝐴𝐴𝐴 = 𝑊𝑊𝑊𝑊

0.2883 ∙ 𝐶𝐶𝐶𝐶 ∙ 𝐾𝐾𝐾𝐾 ∙ 𝐾𝐾𝐾𝐾1 ∙ 𝐾𝐾𝐾𝐾2∙ �𝑉𝑉𝑉𝑉1𝑃𝑃𝑃𝑃

𝐴𝐴𝐴𝐴 = 𝑊𝑊𝑊𝑊

38 ∙ 𝐾𝐾𝐾𝐾 ∙ 𝐾𝐾𝐾𝐾3 ∙ 𝐾𝐾𝐾𝐾𝑣𝑣𝑣𝑣∙

𝐸𝐸𝐸𝐸�(𝑃𝑃𝑃𝑃 − 𝑃𝑃𝑃𝑃𝑏𝑏𝑏𝑏)

(*) Minimum overpressure 2.90 psigDifferent temperature to 59º F, multiply by Ktk values different to k=1.41, multiply by KcFor other fluids or working conditions use the formulas.

12

Values used in formulas

Flow lb/hr

Overpressure 10% (*)

Orificies Area in2 ø0.71 ø0.91 ø1.14 ø1.46 ø1.85 ø2.36 ø2.95 ø3.74 ø4.17 ø4.92

psig 0.39 0.64 1.02 1.67 2.69 4.38 6.85 10.99 13.68 19.02

7.11 445 728 1160 1885 3040 4956 7743 12423 15468 21510

14.22 571 930 1484 2412 3891 6345 9914 15909 19806 27545

21.33 692 1131 1801 2930 4727 7705 12037 19317 24052 33446

28.45 816 1332 2121 3450 5564 9074 14176 22749 28325 39388

35.56 955 1561 2487 4043 6521 10633 16612 26658 33193 46156

42.67 1071 1750 2789 4535 7317 11927 18638 29906 37236 51780

49.78 1210 1980 3153 5128 8270 13483 21067 33806 42091 58530

56.89 1362 2227 3545 5767 9301 15166 23693 38021 47340 65830

64.00 1490 2434 3876 6305 10170 16581 25906 41573 51760 71976

71.12 1616 2641 4206 6843 11036 17994 28116 45115 56172 78112

85.34 1865 3047 4855 7895 12734 20759 32434 52049 64805 90116

99.56 2116 3459 5509 8960 14453 23563 36817 59079 73557 102288

113.79 2368 3869 6164 10024 16171 26363 41191 66101 82298 114444

128.01 2619 4279 6817 11085 17882 29152 45550 73092 91005 126552

142.23 2930 4786 7624 12399 20000 32606 50947 81754 101787 141545

156.46 3172 5183 8256 13426 21656 35307 55164 88522 110216 153265

170.68 3422 5591 8907 14484 23362 38089 59512 95500 118904 165347

184.90 3671 5999 9555 15538 25064 40863 63846 102453 127559 177384

199.13 3922 6407 10205 16599 26773 43649 68200 109440 136259 189480

213.35 4173 6817 10858 17659 28484 46438 72558 116435 144967 201590

227.57 4422 7227 11508 18717 30192 49223 76906 123412 153655 213672

241.80 4672 7632 12156 19771 31890 51992 81231 130355 162300 225691

256.02 5042 8236 13120 21339 34419 56114 87673 140692 175170 243591

270.24 5293 8647 13774 22401 36132 58907 92038 147696 183890 255716

284.47 5545 9057 14427 23462 37847 61701 96404 154700 192611 267846

355.58 6784 11085 17655 28711 46312 75504 117971 189309 235700 327765

426.70 8047 13146 20939 34055 54930 89554 139921 224532 279557 388752

497.82 9290 15181 24180 39324 63429 103410 161572 259277 322816 448907

568.93 10695 17474 27833 45265 73015 119038 185991 298461 371604 516750

640.05 14950 24425 38903 63268 102054 166383 259960 417160 519391 722262

711.17 16577 27084 43138 70155 113161 184491 288254 462565 575922 800872

Technical information / Gases discharge flow / Capacity chart - Air

(*) Minimum overpressure 2.90 psig Saturated steam values For superheated steam, multiply by ks For other fluids or working conditions use the formulas.

𝐴𝐴𝐴𝐴 = 𝑊𝑊𝑊𝑊

𝐶𝐶𝐶𝐶 ∙ 𝑃𝑃𝑃𝑃 ∙ 𝐾𝐾𝐾𝐾 ∙ 𝐾𝐾𝐾𝐾1 ∙ 𝐾𝐾𝐾𝐾2∙ �𝑍𝑍𝑍𝑍 ∙ 𝑇𝑇𝑇𝑇𝑀𝑀𝑀𝑀

𝐴𝐴𝐴𝐴 = 𝑊𝑊𝑊𝑊

0.2883 ∙ 𝐶𝐶𝐶𝐶 ∙ 𝐾𝐾𝐾𝐾 ∙ 𝐾𝐾𝐾𝐾1 ∙ 𝐾𝐾𝐾𝐾2∙ �𝑉𝑉𝑉𝑉1𝑃𝑃𝑃𝑃

𝐴𝐴𝐴𝐴 = 𝑊𝑊𝑊𝑊

38 ∙ 𝐾𝐾𝐾𝐾 ∙ 𝐾𝐾𝐾𝐾3 ∙ 𝐾𝐾𝐾𝐾𝑣𝑣𝑣𝑣∙

𝐸𝐸𝐸𝐸�(𝑃𝑃𝑃𝑃 − 𝑃𝑃𝑃𝑃𝑏𝑏𝑏𝑏)

13

Technical information / Liquids discharge flow / Capacity chart - liquids

Values used in formulas

Flow SCFH

Overpressure 10% (*) Orificies Area in2 ø0.71 ø0.91 ø1.14 ø1.46 ø1.85 ø2.36 ø2.95 ø3.74 ø4.17 ø4.92

psig 0.39 0.64 1.02 1.67 2.69 4.38 6.85 10.99 13.68 19.02

14.22 298 487 775 1260 2033 3314 5178 8309 10345 14386

28.45 403 658 1048 1705 2750 4484 7006 11242 13997 19464

42.67 493 806 1283 2086 3365 5486 8572 13756 17127 23817

56.89 569 930 1481 2409 3886 6335 9898 15884 19777 27501

71.12 636 1040 1656 2693 4344 7083 11067 17759 22111 30747

85.34 697 1139 1814 2951 4759 7759 12123 19454 24221 33682

99.56 753 1230 1960 3187 5140 8381 13094 21013 26162 36380

113.79 805 1315 2095 3407 5495 8959 13998 22463 27968 38892

128.01 854 1395 2222 3613 5829 9503 14848 23826 29665 41252

142.23 900 1471 2342 3809 6144 10017 15651 25115 31269 43483

156.46 944 1542 2456 3995 6444 10506 16415 26341 32796 45605

170.68 986 1611 2566 4172 6731 10973 17145 27512 34254 47633

184.90 1026 1677 2670 4343 7005 11421 17845 28635 35653 49578

199.13 1065 1740 2771 4507 7270 11852 18518 29716 36998 51450

213.35 1102 1801 2869 4665 7525 12268 19168 30759 38297 53256

227.57 1139 1860 2963 4818 7772 12671 19797 31768 39553 55002

241.80 1174 1917 3054 4966 8011 13060 20406 32746 40770 56695

256.02 1207 1973 3142 5110 8243 13439 20998 33695 41952 58339

270.24 1241 2027 3228 5250 8469 13807 21573 34618 43102 59937

284.47 1273 2080 3312 5387 8689 14166 22133 35518 44222 61494

298.69 1304 2131 3394 5520 8904 14516 22680 36395 45314 63013

312.91 1335 2181 3474 5650 9113 14857 23214 37251 46380 64496

327.14 1365 2230 3552 5777 9318 15191 23735 38088 47422 65946

341.36 1394 2278 3628 5901 9518 15518 24246 38908 48443 67364

355.58 1423 2325 3703 6023 9715 15838 24746 39710 49441 68753

369.81 1451 2371 3777 6142 9907 16152 25236 40496 50421 70114

384.03 1479 2416 3849 6259 10096 16459 25717 41268 51381 71450

398.25 1506 2461 3919 6374 10281 16761 26189 42025 52324 72761

412.48 1533 2504 3988 6487 10463 17058 26652 42769 53250 74049

426.70 1559 2547 4057 6597 10642 17350 27108 43500 54160 75315

440.92 1585 2589 4124 6707 10818 17636 27556 44219 55056 76560

455.15 1610 2631 4190 6814 10991 17919 27997 44927 55937 77785

469.37 1635 2671 4255 6920 11161 18197 28431 45623 56804 78991

483.59 1659 2711 4319 7023 11329 18470 28858 46309 57658 80179

497.82 1684 2751 4382 7126 11495 18740 29280 46985 58500 81349

512.04 1707 2790 4444 7227 11657 19006 29695 47652 59330 82504

526.26 1731 2828 4505 7327 11818 19268 30105 48309 60148 83641

540.49 1754 2866 4565 7425 11977 19527 30509 48958 60955 84764

554.71 1777 2904 4625 7522 12133 19782 30908 49598 61752 85872

568.93 1800 2941 4684 7618 12288 20034 31302 50229 62539 86966

554.71 1777 2904 4625 7522 12133 19782 30908 49598 61752 85872

568.93 1800 2941 4684 7618 12288 20034 31302 50229 62539 86966

(*) Minimum overpressure 2.90 psigThe results shown correspond to calculations for water at 68ºFFor different relative densities of water to 1, multiply by lbFor other fluids or working conditions use formulas.

𝐴𝐴𝐴𝐴 = 𝑊𝑊𝑊𝑊

𝐶𝐶𝐶𝐶 ∙ 𝑃𝑃𝑃𝑃 ∙ 𝐾𝐾𝐾𝐾 ∙ 𝐾𝐾𝐾𝐾1 ∙ 𝐾𝐾𝐾𝐾2∙ �𝑍𝑍𝑍𝑍 ∙ 𝑇𝑇𝑇𝑇𝑀𝑀𝑀𝑀

𝐴𝐴𝐴𝐴 = 𝑊𝑊𝑊𝑊

0.2883 ∙ 𝐶𝐶𝐶𝐶 ∙ 𝐾𝐾𝐾𝐾 ∙ 𝐾𝐾𝐾𝐾1 ∙ 𝐾𝐾𝐾𝐾2∙ �𝑉𝑉𝑉𝑉1𝑃𝑃𝑃𝑃

𝐴𝐴𝐴𝐴 = 𝑊𝑊𝑊𝑊

38 ∙ 𝐾𝐾𝐾𝐾 ∙ 𝐾𝐾𝐾𝐾3 ∙ 𝐾𝐾𝐾𝐾𝑣𝑣𝑣𝑣∙

𝐸𝐸𝐸𝐸�(𝑃𝑃𝑃𝑃 − 𝑃𝑃𝑃𝑃𝑏𝑏𝑏𝑏)

14

Definitions (EN ISO 4126-1)

Blowdown: The difference between the set and re-seating pressures, normally stated as a percentage on the set pressure of a safety valve except for pressures of less than 3 bar when it is expressed to operate.

Built-up back pressure: The pressure existing at the outlet of the safety valve caused by flow through the valve and the discharge system

Coefficient of discharge: The value of actual flowing capacity (from tests).

Cold differential test pressure: The inlet static pressure at which a safety valve is set to initiate to open on the test bench. This test pressure includes corrections for service conditions, as back pressure and/or temperature.

Flow area: The minimum cross-sectional flow area (but not the curtain area) between inlet and nozzle which is used to calculate the theoretical flow to discharge.

Flow diameter: The diameter corresponding to the flow area.

Lift: The actual travel of the valve disc starting from the closed position.

Maximum allowable pressure: The maximum pressure for which the equipment is designed as specified by the manufacturer.

Overpressure: A pressure increase over the set pressure, at which the safety valve achieves the lift specified by the manufacturer, usually expressed as a percentage of the set pressure.

Pressure: The pressure unit used in this standard is the bar (1 bar = 105 Pa). It is quoted as gauge (relative to atmospheric pressure) or absolute as appropriate.

Relieving pressure: The pressure used for the sizing of the safety valve which is greater than or equal to the set pressure plus the overpressure.

Re-seating pressure: The value of the inlet static pressure at which the disc re-establishes contact with the seat or at which the lift becomes zero.

Safety valve: Valve which automatically, without the assistance of any energy other than that of the fluid concerned, discharges a quantity of the fluid so as to prevent a predetermined safe pressure being exceeded and which is designed to re-close and prevent further flow or fluid after nominal pressure conditions of service have been restored.

Set pressure: The predetermined pressure at which a safety valve under operating conditions initiates to open.

Superimposed back pressure: The pressure existing at the outlet of the safety valve at the time when the device is required to operate.

15

VALVE 5500Safety valve specially designed to work with gases, vapor or liquids

for industrial applications.

Products, specifications and all data in this literature are subject to change without notice. Questions regarding product selection and specifications for specific applications should be directed to BS&B. All sales are subject to the BS&B companies’ standard terms and conditions of sale. Nothing herein should be construed as a warranty of merchantability or fitness for a particular purpose.Hastelloy® is a trademark of Haynes International Inc. Monel® and Inconel® are trademarks of Special Metals Corporation.

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