One relief valve for two diesel twin pumps
One relief valve for two diesel twin pumps
(OP)
Hi everybody.
In an installation of two twin diesel centrifugal split case pumps, one as main and the other as back up. Both take water from the same suction tank and both supply water to the same fire water system.
In case we need a relief valve to protect the system from overpressure. We plan to connect the relief valve to both pumps discharges with tees, and the relief valve discharge pipe is one pipe that goes to the suction tank.
As per NFPA 20. Can I use one relief valve to protect the system for both pumps?.
Is OK to size the relief valve as for one pump only, to protect both?
Thanks in advance for your comments.
In an installation of two twin diesel centrifugal split case pumps, one as main and the other as back up. Both take water from the same suction tank and both supply water to the same fire water system.
In case we need a relief valve to protect the system from overpressure. We plan to connect the relief valve to both pumps discharges with tees, and the relief valve discharge pipe is one pipe that goes to the suction tank.
As per NFPA 20. Can I use one relief valve to protect the system for both pumps?.
Is OK to size the relief valve as for one pump only, to protect both?
Thanks in advance for your comments.





RE: One relief valve for two diesel twin pumps
RE: One relief valve for two diesel twin pumps
RE: One relief valve for two diesel twin pumps
It looks that the check valves would solve the problem, but is there something in the NFPA20 that obligates you to use individual relief valves.
RE: One relief valve for two diesel twin pumps
If it says each or similar wording or specifies where it has to be, looks like you could do it.
Is there a problem if both pumps are running, and hey need relief either the pressure against the check would not allow one to relieve, or the relief is not big enough for both at the same time???
More than likey once you pipe all this and get it set up, buying two will be cheaper
RE: One relief valve for two diesel twin pumps
RE: One relief valve for two diesel twin pumps