Relay Ops Flashcards
Relay pumper min and max psi where adjustment are needed
10 and 100
Minimum hose diameter for relay
2.5. But multiple lines should be used
Most common hose diameter for relay
4in and 5in
Intake pressure relief
Two types and different name
Relay relief valve
Manufacturers and attached later
Pressure relief set at relay pumper.
10 over incoming psi
Max distance relay method
Uses preset tables to determine distance and pressure with each size and length of hose
Equations based of pressures of 200 psi (3in) 185 psi (4-5in)
Constant pressure relay
Set pressure on 175 at each pumper. Discharges are used to regulate pressure as needed 750 feet between relay can be achieved Advantages No coms needed Set hose lengths are pre determined
Attack pumper intake pressure
40- 70 psi
Relay pumper Intake relief Max pressure
50 psi
Ideal intake pressure in relay system
20-30 psi
Best indication of pump cavitation.
Pump pressure will not increase when rpm is increased.
Source pumper minimum intake pressure
20 psi
