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Mechanical Engineering
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Dhukka Junaid

Hydraulic and Pneumatic Test of Mechanical Equipment

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Dear All,

If a Mechanical equipment e.g. Centrifugal Pump or vessels  is subjected to a Hydraulic Pressure Test at 63 kg/cm2 for 30 minutes. Equipment successfully passes hydraulic test. 

If the same equipment is subjected to pneumatic Test at 63 kg/cm2. Should equipment sustain pneumatic Test?

Thanks for your valuable thoughts. 

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It depends to some degree on what constitutes failure. Gases will leak through smaller openings than liquids, so the pneumatic test will be more severe.

Also, the pneumatic test is more dangerous to conduct because of the compressibility of the gas. The compressed gas stores a large amount of energy which is released suddenly if the vessel explodes. Conversely, the hydro test, using essentially incompressible water, releases very little energy if the vessel ruptures.

DrD

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34 minutes ago, DrD said:

It depends to some degree on what constitutes failure. Gases will leak through smaller openings than liquids, so the pneumatic test will be more severe.

Also, the pneumatic test is more dangerous to conduct because of the compressibility of the gas. The compressed gas stores a large amount of energy which is released suddenly if the vessel explodes. Conversely, the hydro test, using essentially incompressible water, releases very little energy if the vessel ruptures.

DrD

Thank you for your response.

From your opinion two things concluded...

1. As air will remove from small openings hence we can test vessels even at low pneumatic pressure. 

2. If there’s no leakage found at 63 kg/cm2 hydraulic pressure then  Vessel can sustain 63 kg/ cm2 pneumatic pressure also but it’s dangerous. 

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That's not what I would conclude, so please do not say that I said those things.

DrD

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