Jockey Pumps in Combined System

[Saber Elkassas]

I working on designing a combined raw/ fire water system. The installed jockey shall be used for raw water supply and system pressure maintenance. The jockey pumps are supplied by a storage tank with 60% fire water reserve.

How to arrange the suction piping and controls to keep the 60% fire water reserve capacity and the system is always pressurized?

 

[Msradell]

I guess I'm missing what the issue is, you just plumb it up like you would any pump with the suction pulling from the storage tank and the discharge tying into the fire loop. Next acupuncture have its own controller to cycle it as needed to maintain system pressure. For she will need a check valve on the discharge side as well as a check valve on the discharge side of the fire pump(s) that also supplied the system but that's pretty normal procedure.

 

[Saber Elkassas]

The main issue here is the case when all the raw water is consumed and only the 60% fire water capacity is remaining, if the jockey pump is kept in operation the users shall consume the fire water reserve as well and if the jockey pump is stopped, the fire water system will not pressurized any more.

So, how to control the jockey to keep the 60% fire water reserve capacity and the system is always pressurized?

 

[cda]

The main issue here is the case when all the raw water is consumed and only the 60% fire water capacity is remaining, if the jockey pump is kept in operation the users shall consume the fire water reserve as well and if the jockey pump is stopped, the fire water system will not pressurized any more.

So, how to control the jockey to keep the 60% fire water reserve capacity and the system is always pressurized?

You have a few to many variables

Hire a fire protection engineer.

Normally the set up you want is normally not allowed in the USA.

 

[north star]

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You will need float controls in the fire reserve tank
to keep the water flowing in as it is being used....If
you run out of all of the 60% fire water reserve
with no more water being supplied to the tank,
...your Jockey Pump or Pumps will need control
wiring connected to the floats to shut them down
when the water stops being supplied to them or
if the water reduces to a "less than normal
operating pressure".

We burned up one Jockey Pump, the whole engine
assembly and the controls, because we did not
have the wiring installed correctly.

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