Fittings shall not be used in systems containing flammable gas-air mixtures.Cast-iron fittings shall comply with the following:.Fittings used with aluminum alloy pipe shall be of aluminum alloy.Fittings used with copper or copper alloy pipe shall be copper or copper alloy.Fittings used with steel or wrought-iron pipe shall be steel, copper alloy, malleable iron, or cast-iron.
Threaded fittings in sizes larger than 4 inches (100 mm) shall not be used unless approved by the Authority Having Jurisdiction.Metallic pipe fittings shall comply with the following:
Water heater, domestic, circulating or side-arm TABLE 1208.4.1 APPROXIMATE GAS INPUT FOR TYPICAL APPLIANCES APPLIANCE Fuel gas systems using hydrogen as a fuel.Fuel gas systems on recreational vehicles manufactured in accordance with NFPA 1192.Building design and construction, except as specified herein.Gas piping, meters, gas- pressure regulators, and other appurtenances used by the serving gas supplier in distribution of gas, other than undiluted LP-Gas.Installation of LP-Gas and compressed natural gas (CNG) systems on vehicles.Installation of LP-Gas systems for railroad switch heating.LP- Gas piping for buildings under construction or renovations that is not to become part of the permanent building piping system-that is, temporary fixed piping for building heat.LP-Gas equipment for vaporization, gas mixing, and gas manufacturing.Proprietary items of equipment, apparatus, or instruments such as gas-generating sets, compressors, and calorimeters.Fuel gas piping in electric utility power plants.Liquefied natural gas (LNG) installations.LP-Gas installations at utility gas plants.Large integrated chemical plants or portions of such plants where flammable or combustible liquids or gases are produced by chemical reactions or used in chemical reactions.Petroleum refineries, pipeline compressor or pumping stations, loading terminals, compounding plants, refinery tank farms, and natural gas processing plants.
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