While the piping codes (B31.1, 31.3) allows piping pressure to exceed design pressure for short periods the flange codes do not. Is this correct or does the piping codes allow over pressure for flanges because flanges are part of the piping?
Seems clear in B31.1 that you can not exceed the flange rating.
"..variations in pressure and temperature
inevitably occur, and therefore the piping system,
except as limited by component standards.."
Table 126.1-1 lists flange code B16.5 as a component standard.
B16.5 says "Pressure–temperature ratings are maximum allowable
working gage pressures.."
Interesting flanges and piping are hydrotested at the same (over) pressure.
Seems clear in B31.1 that you can not exceed the flange rating.
"..variations in pressure and temperature
inevitably occur, and therefore the piping system,
except as limited by component standards.."
Table 126.1-1 lists flange code B16.5 as a component standard.
B16.5 says "Pressure–temperature ratings are maximum allowable
working gage pressures.."
Interesting flanges and piping are hydrotested at the same (over) pressure.