Fuel Gas Piping Both Codes Agree On — Coverage and Sizing Basis, Materials and Joints, Installation Above and Below Ground, Supports, Drips and Sediment Traps, Shutoff Valves and Regulators, Appliance Connections, Testing and Purging, Bonding, Combustion Air and Appliance Location (UPC ch. 12 / IFGC ch. 3–4)
Texas adopts the 2018 UPC (whose chapter 12 reprints NFPA 54, the National Fuel Gas Code) and the 2018 IPC together with the 2018 International Fuel Gas Code it incorporates (22 TAC 367.2(a)). Because both fuel-gas chapters descend from NFPA 54, they agree on nearly everything that matters on the job: what pipe is allowed, how it is joined, where it may and may not run, how deep it is buried, how it is supported, where the valves and sediment traps go, how appliances connect, how the system is tested with air and purged, and how CSST is bonded. The important exceptions — the test pressure and
2018 UPC and 2018 IPC · Reviewed 2026-09-20
1. Coverage, demand and sizing basis
- Coverage runs from the point of delivery to the appliance connections — the point of delivery is the outlet of the service meter assembly (or of the service regulator / shutoff where no meter is installed) (UPC 1202.1; IFGC 401.1).
- Adding an appliance: check the existing piping for capacity for all appliances; if inadequate, enlarge it or run separate piping (UPC 1208.1; IFGC 401.4).
- Systems fed by separate meters (separate consumers) are never interconnected on the outlet side of the meters (UPC 1208.3; IFGC 401.6). Standby fuel connects downstream of the meter only through a backflow-preventing device — a three-way valve that shuts off the regular supply while admitting the standby (UPC 1208.3.1; IFGC 414.2).
- Piping is sized to meet the maximum demand and to deliver at each appliance inlet not less than the minimum supply pressure the appliance requires (UPC 1208.4, 1208.4.3; IFGC 402.1).
- Demand = the sum of the maximum input ratings of the appliances served, all assumed to run at full capacity at the same time (established diversity may be used), adjusted for altitude above 2,000 ft (UPC 1208.4.1; IFGC 402.2). Where the input is unknown, the typical-appliance table is used (UPC Table 1208.4.1: 40-gal stor
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