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402.6 Gas Distribution Pressures
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No gas distribution piping containing gas at a pressure in excess of 1/2 psig (3.5 kPa gauge) shall be run within a building.
Exceptions:
Exceptions:
- Pressure not exceeding 5 psig (34.5 kPa gauge) is permitted for: commercial and industrial occupancies where fuel requirements for appliances exceed 4,000 cubic feet per hour (113.2 m3/h) and such large volume use is supplied through separate gas distribution piping.
- Gas pressure not exceeding 15 psig (100 kPa gauge) is permitted for appliances in excess of 100,000 cubic feet per hour (2830 m3/h) provided the gas distribution piping is installed as provided for in Section 404. The use of pressure in excess of 15 psig (100 kPa gauge) shall be permitted for distribution piping provided all of the requirements of Section 406 and Appendix G are met.
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