![]() Aluminum alloy fitting threads shall not form the joint seal.Larger shall not be used unless approved by Fittings in sizes 6 inches (150 mm) and.Fittings in sizes 4 inches (100 mm) andĪpproved by the Authority Having Jurisdiction.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-armįor SI units: 1000 British thermal units per hour = 0.293 kW Įxception: Sizing shall be permitted to be based upon established load diversity factors. 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.Gas piping, meters, gas- pressure regulators, and otherĪppurtenances used by the serving gas supplier in distribution of gas, other than undiluted LP-Gas.Installation of LP-Gas and compressed natural gas.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.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.Plants where flammable or combustible liquids or gasesĪre produced by chemical reactions or used in chemical Large integrated chemical plants or portions of such.Stations, loading terminals, compounding plants, refinery tank farms, and natural gas processing plants. Petroleum refineries, pipeline compressor or pumping.Industrial gas applications using such gases as acetyleneĪnd acetylenic compounds, hydrogen, ammonia, carbon monoxide, oxygen, and nitrogen.Oxygen- fuel gas cutting and welding systems.Raw material (feedstock) applications except for piping.Installation of appliances such as brooders, dehydrators,ĭryers, and irrigation equipment used for agricultural.That are not connected to a fixed fuel piping system. Portable LP-Gas appliances and equipment of all types.This code shall not apply to the following items (reference standards for some of which appear in Chapter 17):
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