Wednesday, July 22, 2009

[MW:2750] Re: hydrostatic pressure for piping

I would like to add: Check you hoop stress as designed, if I am not wrong if the design is below 20% of hoop stress, API does not ask for pipe pressure
Luis Albanes

--- El lun 20-jul-09, Ramprasad Chari <ramprasad.chari@gmail.com> escribió:

De:: Ramprasad Chari <ramprasad.chari@gmail.com>
Asunto: [MW:2739] Re: hydrostatic pressure for piping
A: materials-welding@googlegroups.com
Fecha: lunes 20 de julio de 2009, 22:57

As per B31.8 considering worst situation of Zone 3 & 4 the min pressure at which Hydro is to be done is 1.4XMOP(max operating pressure) and max at which the hydro can be done is either at a design pressure or at a pressure more than the design pressure.For example if DP is 92 and MOP is 45 then min hydro pressure is 1.4X45=63 but if you carry out Hydro at 150 then your max ALLOWABLE operating pressure becomes 150/1.4=107 but since it is more than DP i.e.92 MAWP shall be only 92 and not 107.
Regards
Aarpee

On Mon, Jul 20, 2009 at 12:34 PM, peyman khazraei <pkhazraei@gmail.com> wrote:
Dear all
 can any body help me for:
 
as construction code for  gas compressor station ASME  B31.8  ,whats the pressure of  hydrostatic test of piping with equipment like air gas cooler as system .
by to ASME Bb31.3 the pressure test  must be according to the vessel or equipment design but i can't ind answer of my question in B31.8 (gas transmission piping......)
 
 thnks
peyman





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