Issuing body
CGA
Latest edition
2014
Region
USA, Global
Equipment items
1
Scope
Storage and handling of anhydrous ammonia in the US — tanks, piping, valves, transfer.
Key requirements (6)
- Compressed Gas Association standard for ammonia (NH3).
- Storage classifications: high-pressure (Type I), low-pressure refrigerated (Type II), refrigerated semi-pressurized (Type III).
- Refrigerated NH3 storage: typically –33 °C atmospheric, double or full containment per API 625.
- Material: low-temperature carbon steel (ASTM A516 Gr 60/70 with stress relief) for refrigerated; A106/A53 for piping.
- Avoids copper, brass, zinc and aluminum due to corrosion / SCC.
- Stress-corrosion cracking risk on un-stress-relieved CS in NH3 with O2 contamination — PWHT mandatory.
Related standards (3)
Applied to 1 equipment item
Cryogenic & Refrigerated Storage