Chapter 13 Determining Pump Discharge Pressure

Question 1

All nozzles are designed for optimal operation at a particular nozzle discharge pressure, 
 solid stream handline nozzles:
 solid stream master stream nozzles:
 low-pressure fog nozzles:
 standard  fog nozzles:

Answer 1

solid stream handline nozzle: 50 psi
solid stream master stream nozzle: 80 psi
low-pressure fog nozzle: 75 psi
standard fog nozzle: 100 psi

Question 2

what are the two reasons that supplying an aerial master stream is among the pump operators most critical functions

Answer 2

1. different area master stream is needed, the fire is large
2. pump operator needs to know the operational limits of the aerial master stream nozzle and water supply system in order to avoid supplying too much pressure. Excess pressure could result in failure of the water supply equipment or excessive force on the aerial device

Question 3

what is NPDP

Answer 3

that pump discharge pressure takes into account all factors that contribute to the amount of work the pump must do to produce a fire stream

Question 4

how does the net pump discharge pressure and the net pump discharge pressure relate when drafting?

Answer 4

net pump discharge pressure is more than the pump discharge pressure due to the work of lifting the water into the engine

Question 5

populating the required pump discharge pressure for simple hose lays requires two steps

Answer 5

step 1. determine total amount of pressure loss in the lay
step2. identify required nozzle pressure
add the two figures

Question 6

Define pump discharge pressure

Answer 6

pressure at which a fire pump must be set to overcome total pressure loss in a hoseline and suppy the correct nozzle pressure for operation