Hydrotest of Pressure Vessel

[Amit Vishwakarma]

Dear Experts

What will be formula of hydro test pressure for long pressure vessel (length = 30mtr. ID = 1.5mtr and thkness of shell = 16mm) when it is be tested in horizontal condition as drwg speak the test pressure at 10kg/cm2 in vertical condition. And for us it is not possible to test the equipment in vertical condition.

Regards

Amit

[Purav Desai]

For shop hydrotest,

 

Hydrotest pressure shall be as per ASME Sec. VIII Div. 1 UG-99(c) i.e.

 

= 1.3 x MAP + Pressure due to Vertical Static Head - Pressure due to Horizontal Static Head.

 

Vertical static head is required to be added to simulate future hydrotest in vertical condition.

 

 

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Regards;

Purav DESAI

purav...@gmail.com

[Ali Al-Zawamri]

Dear,
As per ASME sec. 8 D.1 the hydrotest pressure= 1.3 x MAWP x stress ratio.

This pressure at the top of the vessel.

Regards,

[sathishkumar R]

Dear Amit, Good day.!

 10 kg/cm2 is the least pressure that the all pressure vessel part to be experienced as per your drawing.

 You should mount the pressure gauge on the top of the vessel. Carry out the test in horizontal position, mount the gauge in the top, pressurize till the gauge shows 10 kg/cm2. ( In my opinino, It's enough )

 For Info : Since your drawing directly says the hydrotest pressure, you no need to calculate Static head and all..

  

 The concept behind the static head is you should consider 0.433 psi per feet. In case of testing at vertical position of your pressure vessel, The pressure @ the top will be 7kg/cm2, whereas the bottom of the vessel will experience 10kg/cm2 due to static head. If you mount the gauge in the bottom and it shows 10 kg, We cannot say that the all parts experienced 10kg. It is a Non Conformance.

[george....@gr.bureauveritas.com]

The "smallest ratio" of all components of the vessel, since all components of the vessel (shell, heads, nozzles) may not have the same "allowable stress value"


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