What is the maximum gas pressure allowance for CSST installations, expressed as inches of water column?

What is the maximum gas pressure allowance for CSST installations, expressed as inches of water column?

• A. 28 in wc
• B. 7 in wc
• C. 14 inch water column
• D. 2 psi

Answer: (C)

CSST is intended for low-pressure natural gas distribution, and the code sets a strict upper limit to protect system components and ensure safe operation. The maximum allowed pressure for CSST installations is 14 inches of water column, which is about 0.5 psi. This aligns with typical residential appliance inlet pressures and the testing range CSST is rated for. Values like 7 in wc (0.25 psi), 28 in wc (about 1 psi), or 2 psi exceed the CSST rating and are not permitted.

CSST is intended for low-pressure natural gas distribution, and the code sets a strict upper limit to protect system components and ensure safe operation. The maximum allowed pressure for CSST installations is 14 inches of water column, which is about 0.5 psi. This aligns with typical residential appliance inlet pressures and the testing range CSST is rated for. Values like 7 in wc (0.25 psi), 28 in wc (about 1 psi), or 2 psi exceed the CSST rating and are not permitted.