NFPA NFPA 25 Water-Based Fire Protection Inspection 2 — Questions and Answers
Question 1: Under NFPA 25, what is the required inspection frequency for internal inspection of steel dry pipe and preaction system piping?
- Every 3 years
- Every 5 years (Correct answer)
- Every 10 years
- Every 15 years
Correct answer: Every 5 years
NFPA 25 requires an internal inspection of dry pipe and preaction system piping every 5 years to check for obstructions.
Question 2: According to NFPA 25, what condition requires replacement of a sprinkler head without testing?
- Sprinkler is more than 25 years old
- Sprinkler is a fast-response type
- Sprinkler has a painted finish from factory
- Sprinkler is more than 50 years old in a wet system (Correct answer)
Correct answer: Sprinkler is more than 50 years old in a wet system
NFPA 25 requires that sprinklers 50 years or older in wet systems be replaced or sample-tested; replacement is required if they fail testing.
Question 3: Under NFPA 25, which condition during a hydrostatic test would require the system to fail?
- Pressure drops more than 10 psi in 2 hours (Correct answer)
- Any pressure drop during the test period
- Pressure drops more than 5 psi in 15 minutes
- Pressure drops more than 20 psi in 24 hours
Correct answer: Pressure drops more than 10 psi in 2 hours
NFPA 25 specifies that a hydrostatic test fails if pressure drops more than 10 psi during the 2-hour test period.
Question 4: According to NFPA 25, what must be done after any sprinkler system work that requires draining the system?
- Submit a written report to the AHJ
- Perform a main drain test and restore the system to service (Correct answer)
- Wait 24 hours before restoring service
- Replace all sprinkler heads
Correct answer: Perform a main drain test and restore the system to service
NFPA 25 requires that after any system maintenance requiring draining, a main drain test be performed and the system fully restored to service.
Question 5: Under NFPA 25, how often must the internal condition of wet pipe system piping be inspected in areas with a history of microbiologically influenced corrosion (MIC)?
- Annually (Correct answer)
- Every 3 years
- Every 5 years
- Only after an obstruction event
Correct answer: Annually
NFPA 25 requires annual internal inspections of wet pipe systems in environments with a history of MIC contamination.
Question 6: According to NFPA 25, which valve must be tested by partially closing it and verifying the waterflow alarm activates?
- OS&Y gate valve
- Control valve tamper switch (Correct answer)
- Check valve
- Butterfly valve
Correct answer: Control valve tamper switch
NFPA 25 requires the control valve supervisory (tamper) switch to be tested by partially closing the valve and verifying the supervisory alarm is received.
NFPA NFPA 25 Water-Based Fire Protection Inspection 2
Under NFPA 25, what is the required inspection frequency for internal inspection of steel dry pipe and preaction system piping?