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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