Leak Detection and Testing Procedures Flashcards
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Read the first 7 Leak Detection and Testing Procedures flashcards as text
What documentation must a G3 technician complete after performing a pressure test on a new gas installation?
Answer: A written test record including pressure, duration, date, and technician certification number
A written pressure test record documenting test pressure, hold time, date, and technician's certification number is required for code compliance and liability purposes.
During a pressure hold test, the test pressure drops slightly but then stabilizes. What is the MOST likely cause?
Answer: The temperature of the test medium changed, causing pressure variation
Temperature changes cause pressure variations in a sealed gas system; a drop followed by stabilization typically indicates thermal equilibration rather than an active leak.
If a leak is detected at a threaded fitting during testing, what is the correct repair procedure?
Answer: Disassemble the fitting, clean the threads, apply fresh approved sealant, and reassemble
Correct repair requires disassembly, thread cleaning, application of fresh approved thread sealant, and proper reassembly to ensure a reliable gas-tight seal.
What is the standard hold time for a pressure integrity test on a residential gas piping system before the result can be recorded?
Answer: 10 minutes
A minimum hold time of 10 minutes is the standard requirement for residential pressure integrity tests to allow stabilization and detect any pressure drop.
Which condition requires a technician to tag out and NOT restore gas service after completing a leak test?
Answer: A leak is found that cannot be repaired with available tools and materials on site
If a leak cannot be repaired on site, the system must be tagged out and gas service must not be restored until a proper repair is completed by a qualified technician.
A technician discovers a gas odor in a basement but the electronic detector reads zero. What is the MOST likely explanation?
Answer: The detector's sensor may be depleted or the battery is low, requiring a sensor check
A depleted or malfunctioning sensor will read zero even when gas is present; technicians must verify detector operation with a bump test or sensor check before relying on a zero reading.
When a new gas service line is installed and pressure tested, at what point is the test considered complete and acceptable?
Answer: When the system holds the required test pressure with no measurable drop for the full required hold time
A pressure test is only complete and acceptable when the system maintains the required test pressure without any measurable drop throughout the entire required hold time.