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Subchapter 7. General Industry Safety Orders
Group 20. Flammable Liquids, Gases and Vapors
Article 146. Piping, Valves and Fittings

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§5606. General.

(a) The design, fabrication, assembly, test and inspection of piping systems containing flammable or combustible liquids shall be suitable for the expected working pressures and structural stresses. Conformity with the applicable sections of ANSI B31 American National Standard Code for Pressure Piping, and the provisions of this chapter, shall be considered prima facie evidence of compliance with the foregoing provisions.


(1) Tubing or casing on any oil or gas wells and any piping connected directly thereto.

(2) Motor vehicle, aircraft, boat or portable or stationary engine.

(3) Piping within the scope of any applicable boiler and pressure vessel Code.

(b) Piping systems consist of pipe, tubing, flanges, bolting, gaskets, valves, fittings, the pressure containing parts of other components such as expansion joints and strainers, and devices which serve such purposes as mixing, separating, snubbing, distributing, metering, or controlling flow.

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