Gas PipingQuestion 93 of 120
A new residential gas piping system will operate at a working pressure of 7 in w.c. (about 1/4 psi). What is the minimum test pressure required for the pressure test?
a.0.375 psi, which is 1.5 times the working pressure
b.3 psi
c.10 psi
d.1.5 in w.c.
Explanation
The test pressure must be at least 1.5 times the proposed maximum working pressure but never less than 3 psi, and 1.5 times 1/4 psi is far below that floor, so 3 psi governs. The 0.375 psi and 1.5 in w.c. answers apply the multiplier while ignoring the 3 psi minimum; 10 psi exceeds what the code requires for this system.
Law Reference: IFGC §406.4Practice all 120 questions free — no signup required.
Related questions on this topic
- A gas furnace sits in a basement mechanical room. Its manual shutoff valve is installed in an adjacent storage room 9 ft away, behind a closed door. Why does this installation fail inspection?
- On which of the following appliances does the IFGC NOT require a sediment trap ahead of the appliance control valve?
- A corrugated stainless steel tubing (CSST) gas system is installed in a two-story house. What is the minimum size of the copper bonding jumper used to bond the CSST system to the electrical service grounding electrode system?
- The same 3 psi test is applied to the piping with a mechanical gauge. What is the minimum time the pressure must be held without any loss?
- Which practice is correct when pressure testing a fuel gas piping system?
- A gas range is connected with a listed appliance connector that runs 4 ft from the shutoff valve to the range. Which statement about this installation is correct?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against Journeyman Plumber Licensing Exam (UPC/IPC-based) · How we review