Pump types and theory . Types of pumps. There are three main types that will be covered; Rotary gear Rotary vane Centrifucal Centrifucal pumps are the most common type of pump found today, we will go into its use in depth. Rotary Gear Pumps.
Throttle controls the rotation speed of the impellor. More throttle = more pressure
Intake from steamers and 2 ½
Water being supplied to steamer intake into pump, flowing discharges and filling tank at the same time
Relief Valves are
Used to sharp increases in pressure from going all the way through the attack lines and harming the nozzle crew
Excess pressure is dumped into the intake side of the pump