What is “Relay Pumping”?
When two or more pumps are arranged in series to receive and relay a supply of water on to another pump.
When is relay pumping typically used?
It is often used when the supply is distant, to overcome friction and/or head loss in the hose.
Name four (4) factors that should be considered before relay pumping.
- The quantity of the water required on the fireground.
- The distance between the fireground and the nearest water supply.
- The number and capacities of available pumps.
- The terrain over which the relay extends.
Name the two (2) types of relay pumping.
- Open circuit.
- Closed circuit.
Describe open circuit relay pumping.
The initial pump delivers water to a holding dam or appliance tank, rather than a collector.
Describe closed circuit relay pumping.
The “base” pump delivers water to a “booster” pump(s) who then delivers water to the “fireground” pump.
What is the maximum number is hose lengths between the base pump and the first booster pump?
Should not exceed 5 lengths.
What is the maximum number of hose lengths between the booster pump and the fireground pump?
Should not exceed 7 lengths.
True or False; Firefighters should use twin hose lines between the base pump and the relay pumps?
True.
