What is the difference between working,burst and proof test pressure

For a piping component,it will have a working pressure,proof test pressure and burst pressure.What is the difference between these pressure specifications for pipe fittings products?

Forged steel flange hydro pressure test

Forged steel flange hydro pressure test

The working pressure is the working conditions range of the pipe fittings or flanges,normally called pressure range.

Hot induction bend ready for burst proof test in Hebei Haihao

Hot induction bend ready for burst proof test in Hebei Haihao

Proof pressure for the pipe fittings or flanges,proof pressure means over-range pressure,is the maximum pressure that may be applied to the pipe fittings or flanges without changing its quality.After the pressure is released,the pipe fittings will recover to the original if the pressure is under the proof pressure limit.

A860 wphy fittings for-CNPC oil pipeline burst testing

A860 wphy fittings for-CNPC oil pipeline burst testing

Burst pressure is the maximum pressure that maybe applied to the piping component without physical damage.Burst pressure can be defined as the maximum pressure this pipe fitting can withstand before breaking.When the pressure exceeds the burst pressure, the pipe will explode.

Stainless steel pipe fittings after burst proof testing

Stainless steel pipe fittings after burst proof testing

For example the following pressure ranges of a piping component:

Working pressure: less than 5.0 Mpa,

Proof pressure: 3times of working pressure 15.0Mpa,

Burst pressure: 6times of working pressure 30.0Mpa.

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