To calculate a working pressure derated for elevated temperature, multiply the hose working pressure shown in the chart by the appropriate derating factor below.
Note: The working pressure of an assembly at elevated temperatures may be affected by fitting type, material, and method of attachment.
Working Pressure Derating Factor
*T301 is not listed in B31.1, but its tensile and yields are identical to T304 per ASM Metals Reference Book 3rd Ed. Pg 364
**Do not use for temperatures lower than 32°F