back pressure regulator
back pressure regulator
(OP)
Hi guys,
Can some one expand on how to evaluate back pressure regulator set pressure and capacity requirement in a hot oil system which typically include a heater, expansion tank, system piping and all heat users or loops.
Can some one expand on how to evaluate back pressure regulator set pressure and capacity requirement in a hot oil system which typically include a heater, expansion tank, system piping and all heat users or loops.





RE: back pressure regulator
RE: back pressure regulator
RE: back pressure regulator
Using only the minimum hot oil flow through a hot oil system is an often unrecognized way to improve the efficiency at the heater by as much as a few %. While the heat demand at the process is the same, a fired heater will use less fuel to heat a smaller hot oil flow through a large delta-T than it will when a lot of high temperature hot oil is mixed with the cold stuff returning from the process (large flow through a small delta-T).
Just a thought. -sshep
RE: back pressure regulator
Hence the backpressure regulator is more like a flow controller, in this case. I would size it based on the two criteria:
1) Maximum design flowrate - CV must be large enough to manage this
2) Minimum design flowrate - Don't want to oversize the valve.
Depending upon how wide the gap is between these two design limits, you may have to use multiple valves or bypasses, etc.
Cheers