What are the most common used pressure safety/relief valve standards in the world?

 Here are the standards for pressure safety/relief valve against the country name.

Widely used standards are highlighted in blue font. 


CountryStandard No.Description
GermanyA. D. Merkblatt A2Pressure Vessel Equipment safety devices against excess pressure - safety valves
TRD 421Technical Equipment for Steam Boilers Safeguards against excessive pressure - safety valves for boilers of groups I, III & IV
TRD 721Technical Equipment for Steam Boilers Safeguards against excessive pressure- safety valves for steam boilers group II
United Kingdom, UKBS 6759Part 1 specification for safety valves for steam and hot water
Part 2 specification for safety valves for compressed air and inert gas
Part 3 specification for safety valves for process fluids
FranceAFNOR NFE-E
29-411 to 416		Safety and relief valves
NFE-E-29-421Safety and relief valves
KoreaKS B 6216Spring loaded safety valves for steam boilers and pressure vessels
JapanJIS B 8210Steam boilers and pressure vessels - spring loaded safety valves
AustraliaSAA AS1271Safety valves, other valves, liquid level gauges and other fittings for boilers and unfired pressure vessels
USAASME IBoiler applications
ASME IIINuclear applications
ASME VIIIUnfired Pressure Vessel Applications
ANSI/ASME PTC 25.3Safety and Relief Valves - performance test codes
API RP 520Sizing selection and installation of pressure relieving devices in refineries, Part 1 Design, Part 2 Installation
API RP 521Guide for pressure relieving and depressurizing systems
API STD 526Flanged steel pressure relief valves
API STD 527Seat tightness of pressure relief valves
EuropeEN ISO 4126Safety devices for protection against excessive pressure
InternationalISO 4126Safety valves - general requirements

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