PRV in trapped piping
PRV in trapped piping
(OP)
Could anyone inform me, if is necessary to install PRV´s in trapped isolated piping, with lenght normally above 100 ft??
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RE: PRV in trapped piping
RE: PRV in trapped piping
RE: PRV in trapped piping
Liquids: Well expansion is expansion and solar heating could in many cases cause the pressure to increase significantly if its a blocked in volume. In this case i think that a thermal relief valve would be recommended in any case.
Best regards
Morten
RE: PRV in trapped piping
My situation comprises a trapped liquid piping, with lenght above 100ft between inventory valves, which will be closed in case of fire, for example.
The fluid is cracked naphta with low boiling point.
Does anyone had a similar situation??
RE: PRV in trapped piping
Best regards
Morten
RE: PRV in trapped piping
As Morten mentioned, it's really not a function of line length; rather, it's the potential risk involved with an overpressure in the line (contents, hazard, expansion coefficients, etc.).
RE: PRV in trapped piping
You don't need much 'flow' to protect against overpressure in this case but if your isolation valves are truly 'bubble tight', the increase in pressure can be up to 100 psi per deg F. Naphtha won't be that high but a relatively small temperature rise can still result in a lot of pressure.