EVT EVT Fire Pump Systems & Water Delivery 1 — Questions and Answers
Question 1: What is the rated capacity of a fire pump used to classify it under NFPA 1901 standards?
- Maximum pressure at 0 GPM
- Flow at 150 PSI net pump pressure
- Flow at rated pressure from draft (Correct answer)
- Suction lift capacity in feet
Correct answer: Flow at rated pressure from draft
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?
- 100%
- 70% (Correct answer)
- 50%
- 25%
Correct answer: 70%
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?
- Pressure relief valve
- Tank-to-pump valve check valve (Correct answer)
- Primer pump
- Discharge gate valve
Correct answer: Tank-to-pump valve check valve
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?
- 100 PSI
- 150 PSI (Correct answer)
- 165 PSI
- 200 PSI
Correct answer: 150 PSI
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?
- Cavitation or loss of prime (Correct answer)
- Relief valve opening
- Correct pump operation
- Discharge valve partially closed
Correct answer: Cavitation or loss of prime
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.
Question 6: Which NFPA standard governs the in-service inspection, testing, and maintenance of fire department apparatus including pump tests?
- NFPA 1901
- NFPA 1911 (Correct answer)
- NFPA 1710
- NFPA 13
Correct answer: NFPA 1911
NFPA 1911 covers the in-service inspection, testing, maintenance, and retirement of in-service automotive fire apparatus, including annual pump tests.
EVT EVT Fire Pump Systems & Water Delivery 1
What is the rated capacity of a fire pump used to classify it under NFPA 1901 standards?