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self actuated pressure regulators

self actuated pressure regulators

self actuated pressure regulators

we are having two self actuated pressure regulators on LPG Line to plant having inlet pressure of 270psig and set pressure of 14.7 psig.
the capacity of each regulator is 230kg/hr of lpg.however it was learnt that the capacity should have been 315kg/hr of LPG for each regulator.
these regulaors have been procured and installed at site.
now question is how to ensure that these regulators provide 315 kg/hr of LPG in place of 230kg/hr?
or a third regulator in pararllel is the only answer?

RE: self actuated pressure regulators

You've got to review the sizing calcs for this regulator and re run them to see if there is sufficient headroom to go from 230kg/hr to 315kg/hr at say no more than 95% of the wide open Cv at the higher flow. The regulator vendor could rerun these calcs for you in 5minutes flat. Am assuming that at 95% of max Cv, set point droop on this PCV is minimal - the supplier would know best. If you're in luck, the supplier would give you a larger size replacement trim off the shelf otherwise.

RE: self actuated pressure regulators

You call it a self acting regulator, I interpret that as a simple spring and diaphragm, this type of regulator has significant droop (pressure loss with flow)
You want to increase the flow by 37% I expect that would cause a significant drop in pressure, only the designer of vendor can tell you if it's possible without more detail.

Regulators with a pilot regulator (small regulator controlling a larger valve) tend to have better flow characteristics because it acts similar to a pressure amplifier

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