Flange rating 4

[johngladstone]

Dears folks ,
Pump design pressure is 150 psi pumping 400 GPM for fluid temperature 200 F

How much flange​ rating will be suitable ?

Is iclass according ASMI / ANSI ,
150 #​ CS is​ Ohk ?

Best regards
John gladstone

 

[LittleInch]

Each system has it's own issues so what works for one won't work for another.

Elevation, if that's what you're talking about, is subjective. As system designed for 10 psi of a liquid will be affected by a small change in elevation. One designed for 500 psi of a gas won't.

So it's just somehting which you need to consider when trying to find the worst case pressure location or set of circumstances to make your design safe. In the example given by alchemon that's what he or she has done. In normal operation the pressure might only be 230 psig or lower if you flow more than 40GPM (in the example), but when you have no flow and shut in head then the pressure can increase. Your design needs to allow for the reasonable worst case.

If say your pipe from the pump then went down by say 10m this would add about 15psi to the design pressure of the pipe.Something like 30m (45 psi) starts to become significant so would need to be added also.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[johngladstone]

Hi littlench

I need clarify for this point
Regarding point 100 psi which estimate by
alchemon mention this point :-
Static pressure at inlet pump.
Static pressure at inlet at no flow
Is it difference in terminology
Is he mean ststic pressure which calculate by any text book ?
Or I missing some thing ?

From practical. Point of view you advice
Flange rating at discharge be reflect also at auction point and use same rating ?class 300 ?

Regarding gasket class can I use class 300
Or class 300/600 ?

Warm regards
John

 

[LittleInch]

It's the pressure which exists at the inlet to the pump when there is no flow.

An example might be that the inlet is connected to a tank. If the tank is full then that's what you use to calculate the inlet pressure depending on the elevation of your pump as your Croxton losses are now zero.

There is no such thing as gasket class. There are gaskets which are valid for class 300 flanges based on size of the raised face.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[johngladstone]

It mean at auction line get type of calculation when there is flow and there is no flow

If there is elevated tank
Static suction pressure will be traditional method available in any textbook am I right ?

If there is sucking fluid from well
We must calculate static suction pressure
Where is no flow ?
From where get this method of calculation
?

 

[LittleInch]

John - we can't list all possible combinations - you just need to work it out.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[johngladstone]

Ohk
Noted