Can the same PSV be used in water and nitrogen
Can the same PSV be used in water and nitrogen
(OP)
Hello,
I received a request to verify if a Farris valve (27DA23-M20), which is currently used in water service can be used in nitrogen service. Would this be possible?
Thank you
I received a request to verify if a Farris valve (27DA23-M20), which is currently used in water service can be used in nitrogen service. Would this be possible?
Thank you





RE: Can the same PSV be used in water and nitrogen
Some valves are not designed for both services, and you have to de-rate the discharge coefficient using Figure 38 in API 520 Part 1. The trims are designed differently for vapor and liquid service.
RE: Can the same PSV be used in water and nitrogen
Dejan IVANOVIC
Process Engineer, MSChE
RE: Can the same PSV be used in water and nitrogen
The valve will most likely react differently on air and on water. So they are not interchangeable between the services because they will react differently on each service and the ASME nameplate will reflect the set and service the valve is being used on. Good to know.
Thank You both! Greatly appreciated.
RE: Can the same PSV be used in water and nitrogen
"A single design handles air, steam, vapor and liquid services."
Hope this helps!
RE: Can the same PSV be used in water and nitrogen
RE: Can the same PSV be used in water and nitrogen
You should be able to obtain the liquid service stamp from the supplier, without the need to change the valve. There are no reasons for changing the valve, if meets the required liquid relief capacity.
Dejan IVANOVIC
Process Engineer, MSChE
RE: Can the same PSV be used in water and nitrogen
RE: Can the same PSV be used in water and nitrogen
JAC
RE: Can the same PSV be used in water and nitrogen
Much appreciated.
RE: Can the same PSV be used in water and nitrogen
I think your statement might should be corrected as follows:
"Therefore, if you place a the
AirLiquid Service PRV directly intoLiquidAir Service at 100 psi, the Spring is 4 ranges too heavy. Your Overpressure Protection will not provide adequate capacity. On the other hand, placing a 100 psiLiquidAir Service 27DA23 directly intoAirLiquid Service will give you an Air PRV with a weak spring that does not even show up on the OEM Air/Gas Chart."Am I wrong?