JOCKEY PUMP J003
A small pump used to keep a pressure on a fire main. The jockey pump keeps a high positive pressure on the discharge side of fire pumps.
If you put packing in the stuffing box of fire pumps the pump will run almost continually to compensate for the packing leakage.
Most fire pumps equipped with a mechanical seal run a lot less frequently. Split seals have become the seal of choice for most of these fire pump applications.