gauge pressure 1

[Thuba]

Good day,
Gauge pressure measures static pressure component of Bernoulli equation. Say l put gauge pressure between point 1 and 2, assuming minor head loss due pipe length, the 2 gauges will read differently due to potential energy difference and also due pipe diameter. See attached. l am asking a booster system requires 8bar of steam. lf l supply it with 8 bar of steam in 3/4inch pipe vs l supply it with 8 bar steam 1/2 inch pipe, l assume mass flowrate will be totally different

 

[Latexman]

All else being equal, yes, the mass flow rate will be different in 3/4” vs. 1/2”.

 

[Thuba]

All else being equal, yes, the mass flow rate will be different in 3/4” vs. 1/2”.

Ok thank you, so just stating that a booster needs 8bars isnt enough information, pipe size from the header is essential too? see attached

 

[Latexman]

You need a pipe sized for the flow, temperature, and pressure of the steam. It is an optimization to minimize the sum of capital cost (pipe size) and operating cost (pressure drop). But at those small pipe sizes, you just don’t want too much pressure drop. Meet your delivery pressure requirements.

 

[Snickster]

Ok thank you, so just stating that a booster needs 8bars isnt enough information, pipe size from the header is essential too? see attached

Say you have a header with pressure at 9 bar. This gives you an allowable pressure drop of 1 bar in the pipe between the header and the steam booster. Now you must design for the 1 bar pressure drop at a design flowrate. What is the design flowrate of the booster is what is also needed to know.

With the upstream pressure and design flowrate of the steam you can determine what pipe diameter is required to produce that 1 bar pressure drop at the design flowrate.

 

[georgeverghese]

A control valve on this steam supply line may most likely be required to modulate this steam booster to keep the primary stream at its control setpoint, so make some allowance for control valve dp also