3 replies to this topic

[kumarss]

Dear all,

 

Good Morning,

 

We are planning to conduct hydro test for the Piping system. Our pump Capacity is 2lpm positive displacement pump. And we need to fill volume of 100m3 at the pressure of 700bar. 

 

How much time is required to fill the entire piping system and to maintain 700bar in the system with the provided pump capacity of 2litres/minue.

 

Note: I dnt have any other data. As I am helping my friend for the same.

 

Thanks to all my friends for your valuable feedback on the above.

[shan]

A positive displacement pump discharge rate is constant at all pressure levels.  If you assume the test fluid is ideal liquid (compressibility=0) and piping material is ideal solid (elasticity=0), the filling time should be fill volume/pump capacity.

[Art Montemayor]

In order to run a hydrostatic test of a piping installation, a practical engineer would never attempt to "fill" the entire piping system with a positive displacement pump meant to raise the pressure in the piping.

 

What an engineer would do would be to fill all of the piping system to be tested (presumably the stated 100 cm³) with a conventional, low pressure discharge centrifugal pump - which can carry out the filling operation quickly and efficiently.  Once the piping system is filled with NO COMPRESSIBLE AIR OR GAS POCKETS, then - and only then - is the positive displacement, piston pump used to raise the pressure in the system from 0 barg to the desired 700 barg.  The time required to raise the hydrostatic pressure is minimal and should not be a concern.   It is common sense that a relatively small capacity piston pump is not the proper type of pump to fill a hydrostatic system for the purpose of a pressure test.  A hydrostatic test involves only hydraulic pressure and, as such, only involves the pressure imposed on a liquid-filled system - in a slow, deliberate manner.

 

What should be a concern here is the technical and engineering understanding of what is going to take place as well as all the required safety procedures that should be prepared before hand and carefully reviewed and hazoped.

[rdcrags]

What Admin said.