Safety Valves Standards

ASME (American Society of Mechanical Engineers)

• Section – VIII Boiler and Pressure Vessel code rules for construction of pressure vessels (Year- 2017)



API (American Petroleum Institute)

• API RP520 Sizing, selection & installation of pressure relieving system in refineries
Part I -Sizing and selection, 9th edition (Year- July 2014)
Part II-Installation 6th edition (Year- March 2015)

• API RP521 Pressure relieving and depressurizing systems. 6th Edition April 2009
• API RP526 Flanged steel safety relief valves. 6th edition Apr. 2009
• API RP527 Seat tightness of pressure relief valves 4th Edition Nov 2014
• API 598 Valve Inspection and Testing (10th edition, October 2016)
• API 2000 Venting Atmospheric and Low-Pressure Storage Tanks (Year-2014)



IEC (International Electro-Technical Commission)

• EN 60529 Degrees of Protection Provided by Enclosures
  (IP Code) - (Year- 2013)



ISA (Instrument Society of America)

• ISA 5.1 Instrument symbols and Identification (Year- 2009)
• ISA 5.3 Graphic Symbols for Distributed Control/Shared Display
• Instrumentation Logic and Computer symbols (Year – 1983)



ISO (International Organization for Standardization)

• ISO 10497 Testing of valves - Fire type-testing requirements



Other Standards

• NEC - National Electric Code
• NEMA - National Electrical Manufacturer’s Association
• NFPA - National Fire Protection Association
• NFPA-496 Purged and pressurized enclosures for electrical equipment (The year 2017)
• OSHA - Occupational Safety and Health Authority
• IBR - Indian Boiler Regulations 1950 (Including Amendments in the year 2017)

ASVIN Safety and Relief Valves are completely governed by codes and regulations.
The two major codes are ASME (USA) and PED (Europe).
The governing standards and recommended practises are API 520 (USA) and EN4126 (Europe).

API 520 incorporates more detail on correction factors (more conservative) for back pressure and viscosity, hence is the most widely used for valve sizing.