To simplify this, the Maximum Allowable Working Pressure (MAWP) is the maximum pressure at which the hose can operate routinely. Although, I strongly suggest the “operating ranges” be far less than the MAWP. However, achieving the MAWP does NOT mean the hose will necessarily fail. Where the hose will fail is called the “Burst Pressure.” Usually, the safety factor between the MAWP and the Burst Pressure will be 4:1; however, some RAGAGEPs may specify a 5:1 safety factor…
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CGA 2.1, 2023 5.7.3 Hose subject to container pressure shall be designed for a minimum working pressure of 350 psi (2410 kPa) and a minimum burst pressure of 1750 psi (12 070 kPa). Hose assemblies, when made up, shall be capable of withstanding a test pressure of 525 psi (3620 kPa). |
Take note that the CGA 2.1 standard has a 5:1 safety factor.
Hose assemblies must be pressure tested at 1.5X’s the MAWP.
It is the user’s responsibility to ensure these safety factors are met BEFORE using the hose! Remember, most chemical hoses come with a standard 4:1 safety factor; anyhrous ammonia hoses require a 5:1 safety factor.