How you calculate the temperature scaling factor?

Used to obtain the corresponding pressure at ambient temperature. Example when testing Proof or burst pressure to a given value at 300°F, but you will test with corresponding pressure (higher) to ambient temperature.

Example. Proof Supply Pressure @ 300°F = 1161 psig Proof Supply Pressure @ AMBIENT = 1161 X Temperature Scaling Factor = 1161 X 1.15 = 1335 psig

     Burst Supply pressure @ 300°F = 1251 psig
Burst Supply pressure @ AMBIENT = 1251 X Temperature Scaling Factor
= 1251 X 1.24
= 1551 psig


Please note different values for TSF for Proof and Burst pressures. Are these values obtained from the material the part is made off? Is there is a calculation, what it is?

• This could be a straightforward application of the ideal gas law or somehting else entirely. Can you tell us more about the problem and possibly the relevant codes etc. you work with? The question was migrated to a site where not everyone is an aerospace person!
– mart
Aug 12 '20 at 8:53
• Material properties depend on temperature. The proof strength and ultimate tensile strength of the material at room temperature will be higher than at 300F, but they probably don't scale in the same proportion. I don't think this has anything to do with gas laws. We don't know the material specification so there is no way to tell how the 15% and 24% factors were derived. Aug 12 '20 at 12:28