"Minimum Pipe Wall Thickness" for ammonia refrigeration systems - Minimum pipe wall thickness shall be based on the properties of the selected pipe material and shall comply with the requirements of ASME B31.5.
EXCEPTIONS:
1. Carbon and stainless-steel threaded pipe shall be minimum Schedule 80 for all sizes.
2. Carbon steel pipe 1-1/2 in. and smaller shall be minimum Schedule 80.
3. Where joined by methods other than threading, stainless pipe 1-1/2 in. and smaller shall be minimum Schedule 40.
Our tip:
Always verify nominal wall thickness of a pipe by using a conversion chart. This should be confirmed anytime when checking out pipe from the parts cage and/or pipe that has been brought on-site from an outside resource. Always confirm the pipe being used has the correct wall thickness and never just assume it does by a quick visual.
Other common pipe schedules are SCH 5, SCH5S. SCH 10, SCH 10S, SCH 20, SCH 30, SCH 40S, SCH 60, SCH 80, SCH 80S, SCH 100, SCH 120, SCH 140, and SCH 160.
IIAR Refrigeration Library 2021
Book 2
13.2.2
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