WALMART MAINTENANCE Plumbing and Facilities 5 — Questions and Answers
Question 1: A Walmart restroom expansion tank on a water heater is required when the building has which type of valve on the main supply?
- A gate valve
- A pressure-reducing valve (PRV) creating a closed system (Correct answer)
- A ball valve
- A check valve on a secondary branch only
Correct answer: A pressure-reducing valve (PRV) creating a closed system
A pressure-reducing valve creates a closed system where thermal expansion has nowhere to go, requiring an expansion tank to prevent pressure buildup.
Question 2: During a facility walk, a maintenance technician notices efflorescence (white mineral deposits) on a concrete wall near a buried pipe. This most likely indicates:
- Normal concrete curing
- A slow water leak saturating the surrounding soil and concrete (Correct answer)
- High humidity from the HVAC system
- Recent exterior painting overspray
Correct answer: A slow water leak saturating the surrounding soil and concrete
Efflorescence on concrete walls near buried pipes is a classic sign of water infiltration, indicating a possible underground pipe leak.
Question 3: A Walmart technician needs to join a copper pipe to a CPVC pipe. What is the correct method?
- Use a copper-to-CPVC transition fitting designed for this connection (Correct answer)
- Solder them together directly
- Use standard PVC cement on both materials
- Wrap the joint in Teflon tape only
Correct answer: Use a copper-to-CPVC transition fitting designed for this connection
Copper and CPVC require a manufacturer-approved dielectric or transition fitting because they cannot be directly soldered or cemented together.
Question 4: What is the purpose of a vent stack in a Walmart store's plumbing system?
- To increase water pressure to upper-floor fixtures
- To allow air into the drain system, preventing siphoning of P-traps (Correct answer)
- To provide a secondary water supply line
- To route wastewater to the sanitary sewer
Correct answer: To allow air into the drain system, preventing siphoning of P-traps
Vent stacks allow air to enter the drainage system, maintaining atmospheric pressure so that P-traps are not siphoned dry.
Question 5: A high-traffic Walmart restroom uses flushometer valves instead of tank-type toilets. What is a key maintenance advantage of flushometer valves?
- They require no water pressure to operate
- They reset faster and handle continuous heavy use better than gravity-tank toilets (Correct answer)
- They use significantly more water per flush
- They are easier to repair because no special tools are needed
Correct answer: They reset faster and handle continuous heavy use better than gravity-tank toilets
Flushometer valves flush directly from the supply line and reset in seconds, making them ideal for high-traffic commercial restrooms.
Question 6: A Walmart maintenance tech finds a leaking compression fitting on a copper supply line. The simplest repair without soldering is to:
- Wrap the fitting with pipe thread tape and retighten
- Replace the ferrule and nut with new compression fitting components (Correct answer)
- Clamp a repair sleeve over the fitting
- Apply epoxy putty over the fitting and allow it to cure
Correct answer: Replace the ferrule and nut with new compression fitting components
Compression fittings rely on a ferrule (ring) compressed against the pipe; replacing the ferrule and nut restores a leak-free seal without soldering.
Question 7: When using a pipe locator tool before digging to repair an underground line at a Walmart facility, the technician is following which safety principle?
- Lock-out/tag-out (LOTO)
- Dig safe / call before you dig (Correct answer)
- Personal protective equipment (PPE) standards
- Confined space entry protocol
Correct answer: Dig safe / call before you dig
Locating underground utilities before excavation (call 811 / Dig Safe) is required by law to prevent striking buried gas, electric, water, or communication lines.
WALMART MAINTENANCE Plumbing and Facilities 5
A Walmart restroom expansion tank on a water heater is required when the building has which type of valve on the main supply?