Based on NFPA 24 maximum leakage per 100 joints is 2 quatz per hour or 0.5 gallon per hour. The standard requires the water and the pressure to be replenished within ten minutes or 1 gpm whichever is larger
Usually, a good practice in industry for new underground systems or systems under the maximum allowable underground leakage (and NFPA 20 Handbook recommendation, 2013 Edition) is that Jockey Pump will supply 1% of the main pump rated capacity (gallons) and add 10 psi to the pressure rating of the fire pump.
A centrifugal fire pump rated 1000 gpm@100 psi requires a 10 gpm @ 110 psi rated capacity Jockey Pump.
Also, remember that the election of the Jockey depends of the longitude, size, type and leaks of the underground piping. If the underground piping leaks excessively, Jockey pump sizing must be increased to the maximum permitted.
In addition, if the Jockey serves an automatic sprinkler system it must be sized to flow a quantity of water less than or equal to that required by a single sprinkler head.
Jockey Pump must make up the allowable leakage rate in 10 minutes or 1 gpm. (3.8L/m) whichever is larger.
Please, verify this information with the AHJ.
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