Restriction Orifice.
Restriction Orifice.
(OP)
During depressuring a portion of pipes more than 1h and half is taken. A Restriction Orifice (RO) is used to depressurize the system to avoid reaching -46 deg-C (pipe design temp.)The RO pressure drop was designed for 300 bars.
In fact the pressure drop is about 200 bars, how can we determine the new orifice diameter (should be enlarged)to allow a short depressuring time (30 minutes for example) and avoiding to reach the pipe design temperature ?
Best Regards.
In fact the pressure drop is about 200 bars, how can we determine the new orifice diameter (should be enlarged)to allow a short depressuring time (30 minutes for example) and avoiding to reach the pipe design temperature ?
Best Regards.





RE: Restriction Orifice.
piece of cake, the flow is proportional to the orifice area.
simple ratio exercise...
RE: Restriction Orifice.
RE: Restriction Orifice.
krsmani77, I am talking about downstream pipe temperature.
The fluid depressurized thru a piping system then flare system.
Thanks again for your help with my best regards.
RE: Restriction Orifice.
RE: Restriction Orifice.
Otherwise, develop correlation for enthalpy each side of orifice to calculate temperature drop of fluid and % flash (if a liquid). The harder part is to set up an equation for the heat loss to atmosphere. Once done, then set these equations up in an EXCEL spreadsheet and examine smaller time intervals (100 intervals?) to get a good apporximation. Of for a quick estimate average calculations done at initial conditions and at final or equilibrium conditions.
The more you learn, the less you are certain of.
RE: Restriction Orifice.
RE: Restriction Orifice.
Mechanical Engineers Area - Piping & fluid mechanics engineering Forum
cbuck (Mechanical) 11/11/02 (posted 09/10/02) 44 replies
"Time required to exhaust air though an oriface "