Crosby Engineering HandbookTechnical Publication No. TP-V300

Chapter 4

Codes and StandardsAmerican Petroleum Institute (API)

ANSI/API Recommended Practice 520 Part I, Sizingand Selection. This API design manual is widely usedfor sizing of relief valves on both liquid and gas filledvessels: (a) liquid vessels - paragraphs 5 and 6, and (b)gas filled vessels - Appendix D-3. This RP covers onlyvessels above 15 psig.

ANSI/API Recommended Practice 520 Part II, In-stallation. This includes: (a) recommended piping prac-tices, (b) calculation formula for reactive force on valve(2.4), and (c) precautions on preinstallation handling anddirt.

ANSI/API Recommended Practice 521, Guide forPressure Relief and Depressuring Systems. An ex-cellent document on everything from causes of overpres-sure through flare stacks.

ANSI/API Recommended Practice 526, FlangedSteel Relief Valves. Gives industry standards as todimensions, pressure-temperature ratings, maximum setpressures, body materials.

ANSI/API Recommended Practice 527, Seat Tight-ness of Pressure Relief Valves. Permissible leakagerate of conventional and bellows valves and testingprocedure.

API Guide for Inspection of Refinery Equipment,Chapter XVI Pressure Relieving Devices. Gives: (a)guide for inspection and record keeping, and (b) fre-quency of inspection, Paragraph 1602.03.

American Society of Mechanical Engineers(ASME)ASME B31.1. Power Piping - Code 1995 Edition

Reference sections:

Chapter II, Part 3, Paragraph 107.8 Safety and reliefvalves including general information, safety and relief

4 - 1

valves on boiler external piping, safety relief valves onnon boiler external piping,and non mandatory appendi-ces on valve installations.

Chapter II, Part 6, Paragraph 122.6 - Pressure Relief Piping

American National Standards Institute (ANSI)ASME/ANSI B16.5. Pipe flanges and flanged fit-

tings. This standard provides allowable materials, pres-sure temperature limits and flange dimensions for stan-dard ANSI flanges.

ASME/ANSI B16.34. Valves - Flanged, Threadedand Welding End. Standard covers pressure, tempera-ture ratings, dimensions, tolerances, materials, nonde-structive examination requirements, testing and markingfor cast, forged and manufactured flanged, threaded andwelding end valves. (End connection dimensions andtolerances are applicable only.)

ANSI B31.8. Gas Transmission and DistributionSystems. Portions of this large document pertain topressure relief and its limitations.

Manufacturers Standardizations SocietyStandard Practices (MSS-SP)

SP-25. (Not applicable to pressure relief valves.)Standard marking system for valves, fittings, flanges andunions. Refer to UG-129 of ASME Section VIII formarking information for pressure relief valves.

SP-55. Quality standards for steel castings for valves,flanges and fittings and other piping components.

SP-61. (Not applicable to pressure relief valves.)Pressure testing of steel valves (refer to API Recom-mended Practice 527 for commercial seat tightnesstests).Other Standards to be considered:

See pages 4-2 and 4-3.

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Crosby Engineering HandbookChapter 4

Codes andStandards

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Codes and StandardsRegulatory Body Codes and Standards

Allami Energerhkai esEnergiabiztonsagtechnikai Felugyelet (AEEF)(State Authority for Energy, Management and Safety)Budapest VIIIKoztarsasag ter 7, Hungary

American National Standards Institute1430 BroadwayNew York, NY 10018

American Petroleum Institute2101 L Street NorthwestWashington, DC 20037

The American Society of Mechanical EngineersUnited Engineering Center345 East 47th StreetNew York, NY 10017

Association Francaise de NormalisationTour EuropeCedex 7F-92049 Paris La Defence, France

Australian Standards AssociationNo. 1 The Crescent HomebushNew South Wales 2140, Australia

British Standards Institute389 Chiswick High RoadLondon W4 4AL, England

Canadian Standards Association178 Rexdale BoulevardToronto, Ontario M9W 1R3

Chlorine Institute Inc.2001 L Street, NWWashington, DC 20036

CC NASTHOLShenogina Street123007 Moscow, Russia

Safety Valves 22/1969/VI.12 (mod) 29/1960/VI.7 (orig)

B16.34 Steel Valves, Flanged and Buttwelded EndsB16.5 Steel Pipe Flanges and Flanged FittingsB31.1 Power PipingB31.3 Chemical Plant and Petroleum Refinery PipingB31.4 Liquid Petroleum Transportation Piping SystemsB95.1 Terminology for Pressure Relief DevicesANSI/ASME PTC 25.3 Performance Test Code, Safety

and Relief Valves

API RP 510 Pressure Vessel Inspection CodeAPI RP 520 Recommended Practice for the Design and

Installation of Pressure Relieving Systems inRefineries: Part 1 - Design; Part II - Installation

API RP 521 Guide for Pressure Relief and DepressuringSystems

API Standard 526 Flanged Steel Safety Relief ValvesAPI Standard 527 Commercial Seat Tightness of Safety

Relief Valves with Metal to Metal SeatsAPI Standard 2000 Venting Atmospheric and Low

Pressure StorageTanksAPI Guide for Inspection of Refinery Equipment

Chapter XVI - Pressure Relieving Devices

Boiler and Pressure Vessel CodeSection I - Power BoilersSection II - MaterialsSection IV - Heating BoilersSection VII - Care of Power BoilersSection VIII - Pressure VesselsSection IX - Welding and Brazing Qualifications

NFE 29-410 to 420

AS1271 Safety Valves, Other Valves, Liquid Level Gagesand Other Fittings for Boilers and UnfiredPressure Vessels 1990 Edition

AS1210 Unfired Pressure Vessels (EAA UnfiredPressure Vessel Code) 1989 Edition

AS1200 Pressure Equipment 1994 Edition

BS6759 Parts 1, 2 and 3 Safety Valves

CSA Z299.2.85 (R1991) - Quality Assurance Program -Category 1

CSA Z299.3.85 (R1991) - Quality Assurance Program -Category 3

CSA Z299.4.85 (R1991) - Quality Assurance Program -Category 4

Pamphlet 39 Type 1-1/2" JQPamphlet 41 Type 4" JQ

GOST R Certification System

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Chapter 4Codes andStandards

Codes and Standards (Cont.)Codes and StandardsRegulatory Body

DIN 50049 Materials Testing Certificates

CEN Standards for Safety ValvesPressure Equipment Directive

HEI Standards for Closed Feedwater Heaters

ISO-9000 Quality SystemISO-4126 Safety Valves - General Requirements

Romanian Pressure Vessel Standard

JIS B8210 Spring Loaded Safety Valvesfor Steam Boilers and Pressure Vessels.

SP-6 Finishes of Contact Faces of Connecting EndFlanges

SP-9 MSS Spot Facing StandardSP-55 Quality Standard for Steel Castings

Stoomwezen Specification A1301

NACE MR0175

NB-25 National Board Inspectors CodeNB-65 National Board Authorization to Repair ASME

and National Board Stamped Safety Valvesand Relief Valves

NFPA 30 Flammable and Combustible Liquids Code

Specifications 602 - Safety Valves for Boilers andPressure Vessels

TBK General Rules for Pressure Vessels

TRD 421 AD-Merkblatt A2

Deutsche Institut Fur NormungBurggrafenstrasse 6D-10787 Berlin, Germany

Comite Europeen de Normalisation(Europeon Committee for Standardisation)rue de Stassart 36B-1050 Brussels, Belgium

Heat Exchange Institute, Inc.1300 Sumner AvenueCleveland, OH 44115

International Organisation for StandardisationCase Postale 56CH-1211Geneve 20, Switzerland

I.S.C.I.R. CentralBucurestiFrumoasa nr. 26, Romania

Japanese Industrial Standard CommitteeJapanese Standards Association1-24, Akasaka 4-chome, Minato-kuTokyo 107 Japan

Manufacturers' Standardization Society of the Valveand Fitting Industry1815 North Fort Myer DriveArlington, VA 22209

Ministerie Van Sociale Zaken En WerkgelegenheidDirectoraat Generaal Van De ArbeidDienst Voor Het Stoomwezen2517 KL Gravenhage - Eisenhowerlaan 102 Holland

National Association of Corrosion EngineersP.O. Box 1499Houston, TX 77001

National Board of Boiler and Pressure Vessel inspectors1055 Crupper AvenueColumbus, OH 43229

National Fire Protection AssociationBatterymarch ParkQuincy, MA 02269

Schweizerisher Verein furDruckbehalteruberwachung (SVDB)Postfach 358030 Zurich, Switzerland

Den Norske Trykkbeholderkomite (TBK)Norsk Verkstedsindustris StandardiseringssentralOscarsgate 20, Oslo, Norway

Verband der TechnischenUberwachungs-Vereine e. V (TUV)Kurfurstenstrafe 564300 Essen 1, Germany

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