operating philosophy of fire pump

[ifran31]

Hello,

Please, I need your comment about the operating philosophy of a group of fire pump:

Setting the pressostat:

The pressostat connected to the jockey pump (1) should be set to:
- A starting pressure of 9.5 bara
- A shut-off pressure of 11 bara

The pressostat connected to the pump jockey (2) must be set to:
- A starting pressure of 9.0 bars
- A shut-off pressure 11 bar.

The pressostat connected to the principal electrical pump set at:
- A starting pressure of 8.5 bars
- Manual Stop

The pressostat connected to the diesel pump set to:
- A starting pressure of 8.00 bars
- Manual Stop

Are there any requirements in the NFPA code?

Thanks in advance and have a nice day

R.B (Mechanical Engineer)

(Note: sorry for my english)

 

[LCREP]

From NFPA 20, 2013 ed
A.14.2.6

Examples of fire pump settings follow (for SI units, 1 psi = 0.0689 bar):
i. Pump: 1000 gpm, 100 psi pump with churn pressure of 115 psi
ii. Suction supply: 50 psi from city — minimum static; 60 psi from city — maximum static
iii. Jockey pump stop = 115 psi + 50 psi = 165 psi
iv. Jockey pump start = 165 psi − 10 psi = 155 psi
v. Firepumpstop=115psi+50psi=165psi
vi. Firepumpstart=155psi−5psi=150psi
vii. Fire pump maximum churn = 115 psi + 60 psi = 175 psi
Where minimum-run timers are provided, the pumps will continue to operate at churn pressure beyond the stop setting. The final pressures should not exceed the pressure rating of the system components.
•

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[ifran31]

Good morning LCREP,

Thank you sir for your good collaboration,

for information, my case is a network of firefighting of a Cannery boxes of sardines
plant,

thank you in advance and good luck to all intevenant,

R.B (Mechanical Engineer)

(Note: sorry for my english)