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Multiple PSV's on a boiler feedwater tank, different set pressures

Multiple PSV's on a boiler feedwater tank, different set pressures

Multiple PSV's on a boiler feedwater tank, different set pressures

(OP)
Hello Gents,

I have run across an intriguing situation involving a boiler feed water tank.  The control valve on the tank has a Cv value of around 160 and supplies steam at 110psig to the feed water tank.  There are a total of four PSVs on the tank, three of which have set pressures of 50psig.  One of the PSVs is half the size of the other three and is set a 20psig.  The maximum flow capacity of all four PSVs equals approximately 14000 lb/hr.  However, according to my calculations, 110psig steam through a 2" control valve with a Cv value of 160 has a maximum flow capacity of around 50,000 lb/hr.  My immediate thought was to obviously spec out a control valve with a much smaller Cv in order for the PSVs to be sized correctly.  could I be overlooking something here?  I dont see how this control valve or PSVs could have been sized this far off.  Further more, why are there three PSVs at 50 psi and one at 20 psi?? I cant rationalize it.
Thanks.

RE: Multiple PSV's on a boiler feedwater tank, different set pressures

I suspect the steam CV may not be the only contingency.
Have you considered overfilling from the condensate CV?

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