jockey pump
jockey pump
(OP)
Greetings,
I am reffering to a typical fire fighting sprinkler piping system acc to NFPA 13 or NFPA 20.
For example, the permanent pressurization of the ff piping system is required in order to prevent the main fire pumps from unnecessary start. This may be done by adding a centrifugal type jockey pump. We can also assume that there is no hydraulic accumulator is the piping system. Knowing the water is an incompressible fluid I can conclude following:
1. In a standby mode, the jockey pump should operate continuously(24hr/day) because if the jockey pump stops the system pressure will drop simultaneously to atmospheric pressure because the water is considered incompressible and none of the hydraulic accumulator fitted in the system.
2. We know that centrifugal pumps should not operate with flow below minimum required i.e. shutt-off valve on discharge should be kept open. So the flow through jockey pump should be led back to the water tank by means of a baypass or orifice valve.
Is above true or I missed something?
Tnx.
I am reffering to a typical fire fighting sprinkler piping system acc to NFPA 13 or NFPA 20.
For example, the permanent pressurization of the ff piping system is required in order to prevent the main fire pumps from unnecessary start. This may be done by adding a centrifugal type jockey pump. We can also assume that there is no hydraulic accumulator is the piping system. Knowing the water is an incompressible fluid I can conclude following:
1. In a standby mode, the jockey pump should operate continuously(24hr/day) because if the jockey pump stops the system pressure will drop simultaneously to atmospheric pressure because the water is considered incompressible and none of the hydraulic accumulator fitted in the system.
2. We know that centrifugal pumps should not operate with flow below minimum required i.e. shutt-off valve on discharge should be kept open. So the flow through jockey pump should be led back to the water tank by means of a baypass or orifice valve.
Is above true or I missed something?
Tnx.





RE: jockey pump
2. Don't really understand the second quetsion.
RE: jockey pump
1. I know that there is a non-return valve in the discharge side if the jockey. But, if we consider following statements:
a.Water is a non compressible fluid,
b.None hydraulic accumulator fitted in the piping system,
c. steel piping considered as a rigid body/non deformable
In that case, I believe it is not possible to maintain the pressure in the piping system without the jockey pump running?
2. Every centrifugal pump should operate with flow above minimum required in order to prevent the overheating of the pump, also it should not operate against closed discharge valve.
RE: jockey pump
I suggest you contact the local NFPA authority and discus this with them.
RE: jockey pump
RE: jockey pump
RE: jockey pump
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RE: jockey pump
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RE: jockey pump
RE: jockey pump
i.e. improper geometrical piping lay-out's inducing air pockets factor
getting in a way dissolved/pressurized into water bulk also eat-up partially the pressure of jockey pupms as occassionally might be witnessed at some high point hydrant's intial flow-out
emitting lot of tiny air bubbles while being released into open atmosphere.
Hope this is helpful/fairly considerable real scenario!
Best Regards
Qalander(Chem)