The main specifications applied to flare sytem design are:
- ASME B16.5 Steel Pipe Flanges and Flange Fittings
- ASME B31.3 Process Piping
- API RP 521 Guide for Pressure Relieving and Depressurising Systems
- API 537 Flare Details for General Refinery and Petrochemical Service
(Note: ISO 2547:2008 is identical to API 537 2nd Ed.)
A number of the large oil and gas operators have their own design specifications that compliment those above.
Other specifications applied include those associated with fabrication (welding, NDE, and materials).