Pennsylvania Code
Title 34 - LABOR AND INDUSTRY
Part I - Department of Labor and Industry
Chapter 14a - STORAGE AND USE OF FLAMMABLE AND COMBUSTIBLE LIQUIDS
Subchapter A - GENERAL PROVISIONS
PIPING, VALVES AND FITTINGS
Section 14a.53 - Materials

(a) Material for piping, valves, or fittings shall be of steel or nodular iron except as set forth in subsections (b) and (c). Nodular iron shall conform to ASTM A395-77, Ferritic Ductile Iron Pressure Retaining Castings for Use at Elevated Temperatures.

(b) Materials other than steel or nodular iron may be used underground or if required by the properties of the flammable or combustible liquid handled.

(c) Materials other than steel or nodular iron shall be designed to specifications embodying principles recognized as good engineering design for the material used and shall be approved by the fire marshal.

(d) When low melting point materials such as aluminum and brass, or materials that soften on fire exposure such as plastic, or nonductile materials such as cast iron are necessary, special consideration shall be given to their behavior on fire exposure. If such materials are used in aboveground piping systems or inside buildings, they shall be suitably protected against fire exposure or so located that any spill resulting from the failure of these materials do not unduly expose persons, buildings, or structures, and are readily controlled by remote valves.