![]() When pipe fittings are drilled and tapped in the field, the operation shall be in accordance with the following:.Acceptable to the Authority Having Jurisdiction.Used within the service conditions anticipated with respect to vibration, fatigue, thermal expansion, or contraction.Used within the fitting manufacturer's pressure-temperature recommendations.Special fittings such as couplings, proprietary-type joints, saddle tees, gland-type compression fittings, and flared, flareless, or compression-type tubing fittings shall be as follows:.Zinc-aluminum alloy fittings shall not be used in systems containing flammable gas-air mixtures.Aluminum alloy fitting threads shall not form the joint seal.Fittings in sizes 6 inches (150 mm) and larger shall not be used unless approved by the Authority Having Jurisdiction.Fittings in sizes 4 inches (100 mm) and larger shall not be used indoors unless approved 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 aluminum alloy.Fittings used with copper or copper alloy pipe shall be copper or copper alloy.Fittings used with steel, stainless steel, or wrought-iron pipe shall be steel, stainless steel, copper alloy, malleable iron, or cast iron. ![]() ![]() Threaded fittings in sizes larger than 4 inches (100 mm) shall not be used.Metallic fittings shall comply with the following:
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