Tie-in lines

[alimazhar]

to piping experts: hi... our project to build pump station Oil& kerosene
Tie- in lines from storage tanks and after branching put gate valve.before Booster pump in entrance of pump station put MOV and check valves.( pdf file attached)
my Question is whether between Gate valve and Mov valves is certain amount of distance? Does anyone know the relevant standard that will be used? Is the process of pollution in this distance important? Thanks

 

[Gator]

First question: did anyone do an NPSH calculation for this proposed pump installation?

I don't know what "process of pollution" means.

 

[alimazhar]

thanks Gator for your attention....
Yes NPSH calculation done. and NPSHA is greater than NPSHR for booster pump.
in our project distance between Gate valve and Mov is 170 meter( Oil & kerosene lines are 170 meter ).oil and kerosene lines after Mov and check valve, manifold and go to booster pump suction.if Mov and Check valve move to nearby Gate vale ( for example distance between gate valve and Mov with check valve is 5 meter) the length of manifold line is 165 meter, before booster pump suction.
in this situation when fluid that will be pumped is change, the distance of manifold line ( 165 meter,before booster pump suction)included previous fluid that means "Process pollution"