Journeyman Plumber ExamFixtures, Faucets, and Other AppliancesMedium
A client is replacing an existing electric water heater. The new water heater has a capacity of 50 gallons. According to common plumbing practices and code, what is the maximum length allowed for the temperature and pressure (T&P) relief valve discharge pipe?
- A10 feet
- B5 feet
- C15 feet
- DNo specific maximum length, as long as it's pitched correctly.
Show answer & explanationAnswer & explanation
Correct answer: D. No specific maximum length, as long as it's pitched correctly.
Plumbing codes, such as the IPC and UPC, do not specify a maximum length for the T&P relief valve discharge pipe. The critical requirements are that it must be properly sized, pitched for drainage, terminate in a safe location, and not be trapped or have any valves.
Why the other options are wrong
- A. 10 feet is not a code-specified maximum length for a T&P discharge pipe.
- B. 5 feet is not a code-specified maximum length for a T&P discharge pipe.
- C. 15 feet is not a code-specified maximum length for a T&P discharge pipe.
T&P Discharge Pipe Length
The length of the discharge pipe from a T&P relief valve is not typically restricted by a maximum numerical value in plumbing codes.
- Must be full size of valve outlet.
- Must terminate in a safe, visible location.
- Must be continuously downward sloping.
- No valves or obstructions allowed.
Memory trick: Safety first, length second, flow always.