PIPELINE PROBLEM
PIPELINE PROBLEM
(OP)
Hi,
I am currectly designing a pipeline for a diesel powered fire pump and we are having some technicalities with the client.
The initital design had a straight suction which was perfect for the application.
However the client was denied permission to extent their boundary fence. Hence we are now forced to have a bend on the suction line.
My questions is how best can we put a dn200 90 degree elbow on the suction line without causing much harm to the pump.
Talk To Other Members
RE: PIPELINE PROBLEM
--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."
RE: PIPELINE PROBLEM
Suction from what?
Pressures? flow rates, velocities all make a difference as to what is acceptable and what isn't / any issues.
But yes, max distance from the bend if you can or make it DN 300?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: PIPELINE PROBLEM
Please note that i have added a sketch on the origional post.
To answer a your questions
1. The suction line is connected to an already existing manifold that is used by the client.
RE: PIPELINE PROBLEM
If you really really want to do something then you could stick in a flow straightener in that inlet/suction leg, but >20D of straight pipe should be good enough to avoid any swirl.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: PIPELINE PROBLEM
--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."
RE: PIPELINE PROBLEM
I will consider a flow straightener if we are not getting desirable discharge.
RE: PIPELINE PROBLEM
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: PIPELINE PROBLEM
Usually the suction piping is one size larger and there is a flat-side-up eccentric reducer at the pump..
But you have not given us enough information .... Where is your PID ?... Where is your pump datasheet/catalog cut ?
Do you have an isolation valve and check valve on the pump discharge ?..... Who knows...
....This is your very first piping layout, Isn't it ?
We can see everything but this on your CD cad model
MJCronin
Sr. Process Engineer
RE: PIPELINE PROBLEM
Its an 8" inlet and 6" outlet.
The reducer I can't see fair enough.
Looks like a NRV on the outlet and the isolation valve is a bit further down the system.
Think you're just being a bit grumpy today....
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: PIPELINE PROBLEM
@MJCronin
Please note that i decided to share an isometric view because i find it easier to comprehend and explain sice its a picture.
The suction pipe is dn200 and the pump inlet is dn150 and there is an eccentirc reducer connected to an expansion joint that is connecte to the pump flange.
I have attached another isometric drawing of the initial design before we faced some technicalities with the client.
Everything was calculated and approved. There is a non return valve and a gate valve on the discharge pipeline.
RE: PIPELINE PROBLEM
Which standard did you implement: CEN/TR 13932, ANSI/HI 9.6+9.8, API 686? Note than most companies in oil&gas industry use API&ANSI/HI.