Gas PipingQuestion 265 of 360
Gas piping must pass through a concrete slab. What is the correct approach?
a.Any bare steel pipe may be embedded directly in the concrete
b.Plastic pipe is required inside the slab in all cases
c.The pipe may simply rest in the trench with no protection
d.Protect the piping against corrosion and physical damage, typically sleeving or protective coating per code
Explanation
Where gas piping passes through or under a concrete slab it must be protected from corrosion and physical damage, commonly with an approved coating, wrap, or a sleeve, following the fuel gas code. Bare steel embedded in concrete can corrode over time. The exact method depends on the material and location, so follow the adopted code and manufacturer instructions.
Practice all 360 questions free — no signup required.
Related questions on this topic
- A sizing table (natural gas) shows 1/2-inch pipe carries 92 cfh and 3/4-inch pipe carries 190 cfh at the governing length. A section supplies a 40,000 BTU/hr wall furnace plus a 45,000 BTU/hr water heater. What is the smallest size that works?
- Which installation practice for a flexible appliance connector is correct?
- Why must horizontal and vertical gas piping be supported at the intervals required by code?
- An older flexible connector is found kinked and corroded when a water heater is replaced. What is the correct action?
- When sizing gas piping, why does the code sometimes require adding equivalent lengths for fittings such as elbows and tees?
- A CSST system is being bonded. Which practice reflects correct bonding technique?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-36 Plumbing Trade Examination · How we review