Preventive Maintenance Procedures Flashcards
7 cards from real PC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Preventive Maintenance Procedures flashcards as text
What is the recommended procedure for winterizing an outdoor hose bibb to prevent freeze damage?
Answer: Close the interior shutoff, drain the line, and leave the hose bibb valve open
Shutting the interior valve, draining trapped water, and leaving the hose bibb open allows any residual water to escape, preventing freeze and burst damage.
A commercial kitchen preventive maintenance schedule should include inspection of the grease interceptor vent. Why is this vent critical?
Answer: It allows gases to escape and prevents siphoning of the trap seal
The vent relieves pressure buildup from decomposing grease and prevents negative pressure from siphoning the trap seal, which would allow sewer gases to enter.
When conducting PM on an emergency eyewash station connected to the plumbing system, what is the primary test performed weekly?
Answer: Activate the unit for at least 1 minute to flush stagnant water and verify flow pattern
Weekly activation flushes stagnant, potentially contaminated water from the supply line and confirms the spray heads are unobstructed and functioning.
During PM of a tankless water heater, scale buildup in the heat exchanger is suspected. What maintenance procedure addresses this?
Answer: Descale by circulating a food-grade white vinegar or descaling solution through the unit
Circulating a descaling solution through the heat exchanger dissolves mineral scale, restoring efficiency without replacing the unit.
What does a plumber check when inspecting a sewage ejector pump system during preventive maintenance?
Answer: The pump operation, check valve function, vent pipe clearance, and basin lid seal integrity
A complete ejector pump PM covers the pump, check valve, vent, and lid seal to prevent sewer gas release and ensure reliable operation.
A building's main water shut-off valve has not been operated in several years. During a PM exercise, it will not fully close. What is the safest immediate action?
Answer: Document the condition and schedule replacement before the next PM cycle
Forcing a seized gate valve can break the stem; documenting and scheduling replacement is the safe approach before an emergency forces a shutdown.
Why should a plumber document findings, measurements, and corrective actions after every preventive maintenance visit?
Answer: To establish trend data that predicts future failures and demonstrates due diligence
Documented PM records reveal patterns of deterioration over time, enabling proactive repairs, and demonstrate that the system was properly maintained.