Plumber Safety & Code Compliance Flashcards
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Read the first 7 Plumber Safety & Code Compliance flashcards as text
Under the UPC, what is the maximum developed length of a trap arm from the trap weir to the inner edge of the vent for a 1.5-inch fixture drain?
Answer: 3 feet 6 inches
The UPC limits 1.5-inch trap arms to a maximum developed length of 3 feet 6 inches to prevent trap siphonage and maintain proper seal.
A gas line pressure test is required before covering in-wall piping. What is the minimum test pressure and duration per most codes for low-pressure natural gas systems?
Answer: 10 psi for 15 minutes
Most codes require low-pressure gas piping to be tested at 10 psi for a minimum of 15 minutes with no pressure drop to ensure leak-free installation.
When installing a pressure-reducing valve (PRV) on a domestic water system, where must a thermal expansion tank be installed?
Answer: On the hot water outlet of the water heater
A thermal expansion tank must be installed on the cold water inlet (supply side of water heater) to absorb pressure from thermal expansion in a closed system created by the PRV.
What is the purpose of a trap primer in a commercial plumbing system?
Answer: To periodically add water to floor drain traps to prevent the seal from evaporating
Trap primers supply small amounts of water to infrequently used floor drain traps to prevent the water seal from evaporating and allowing sewer gases to enter.
Under OSHA regulations, what is the maximum weight a single plumber should manually lift without mechanical assistance according to ergonomic guidelines?
Answer: 51 lbs
NIOSH guidelines and OSHA ergonomic recommendations set 51 lbs as the maximum single-lift weight under ideal conditions before requiring mechanical assistance or team lift.
Which type of pipe joint is required by code when transitioning from cast iron to PVC drain pipe underground?
Answer: Neoprene banded coupling (mission coupling)
A neoprene-gasketed mission coupling (banded transition coupling) is the code-approved method for joining dissimilar pipe materials like cast iron and PVC underground.
What is the purpose of the "one-call" or "811" notification system that plumbers must use before excavating?
Answer: To notify utility companies so underground lines can be marked before digging
Calling 811 before digging notifies utility companies who then mark the location of underground gas, electric, water, and telecom lines to prevent accidental damage.