EVT EVT Fire Pump Systems & Water Delivery

Question 1

What is the rated capacity of a fire pump used to classify it under NFPA 1901 standards?

Accepted Answer

Flow at rated pressure from draft

Answer

Under NFPA 1901, fire pump rated capacity is the flow in GPM the pump can deliver from draft at rated net pump pressure.

Question 2

During a fire pump annual service test, what percentage of rated capacity must the pump deliver at 150% of rated pressure?

Accepted Answer

70%

Answer

NFPA 1911 requires the pump to deliver 70% of rated capacity at 150% of rated pressure during the annual service test.

Question 3

What component prevents backflow from the tank into the pump intake when the pump is operating from a hydrant?

Accepted Answer

Tank-to-pump valve check valve

Answer

A check valve on the tank-to-pump line prevents water from back-flowing into the tank when the pump is supplied by an external source.

Question 4

What is the minimum net pump pressure required for NFPA 1901 acceptance testing of a 1,000 GPM rated fire pump?

Accepted Answer

150 PSI

Answer

NFPA 1901 requires 1,000 GPM rated pumps to deliver full capacity at a minimum of 150 PSI net pump pressure during acceptance testing.

Question 5

What does a drop in fire pump discharge pressure combined with an increase in engine RPM indicate?

Accepted Answer

Cavitation or loss of prime

Answer

Rising RPM with falling pressure indicates cavitation or loss of prime, meaning the pump is not moving water effectively and may be starved of supply.

EVT - Certified Emergency Vehicle Technician Practice Test

EVT - Certified Emergency Vehicle Technician Practice Test

EVT EVT Fire Pump Systems & Water Delivery