Relief system piping
Relief system piping
(OP)
I have space constrain on a relief platform which has a lenght of 6000mm,i want to carry out piping layout of the relief system which has an 8" 900#RJ ristriction orifice which is placed inbetween a 10" ball valve and an 8" ball valve.I have to considered the straight run reqiurement of 7930mm upstream and 1270mm downstream of the risriction orifice.What do you recommend





RE: Relief system piping
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David Baird
mrbaird@hotmail.com
Sr Controls Designer
EET degree.
Journeyman Electrician.
RE: Relief system piping
RE: Relief system piping
The ristriction orifice is a flow measuring instrument installed on the process line and my job notes stipulates a pipe striaght run before and after the orifice should have a distance of 7930mm and 1270mm.This arrangement is part of a relief system ,that was why i posted it with that title.
Hope this will help to clerify the quetion.
RE: Relief system piping
It's just not done - especially if you're describing an 8" plate with a much smaller orifice in it.
Do I have it wrong?
RE: Relief system piping
The straight run length should depend on the beta ratio of your orifice.
If you really require the more run length, you should arrange the piping.
RE: Relief system piping
I assume you mean Orifice Plate Meter when you refer to the RO? If so are you metering gas? If so is it indicative or is it fiscal metering?
Maybe I'm barking up the wrong tree but if it is fiscal gas metering you should look in your project nominated standards, if it mentions ISO 5167 then there are tables for minimum lengths of straight pipe based on factors such as the number of bends in the pipe prior to the meter run, and the orientation of the bends. Using a flow conditioner, either a tube bundle as mentioned by David Baird, or a flow conditioning plate, will allow you to reduce straight lengths.
Check your design/project standards to see what you need to comply to.
Justin.