Issuing body
ISO
Latest edition
Various, 2013–2018
Region
Global
Equipment items
2
Scope
Multi-part standard on safety valves, bursting discs, pilot-operated relief, and combinations.
Key requirements (6)
- Safety devices for protection against excessive pressure (international counterpart of API 520/526).
- Parts: 1 (safety valves), 2 (rupture discs), 3 (CSPRS), 4 (pilot-operated), 5 (CSPRS), 6 (rupture disc selection), 7 (general data).
- Set pressure: ≤ PS (PED design pressure).
- Pop tolerance: ±3% set (typical) for spring valves.
- Certified discharge coefficient by manufacturer testing.
- Used as harmonized PED standard in Europe.