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58.14 TUSTRIAL RELATIONS TITLE 8 ti (Rey later IAo. 13--a-29-75) All piping shall be tested after assembly and proved free of leaks at a pressure of not less than its normal operating pressure or 150 psi, whichever is greater. Flammable material shall not be used for the installation acceptance pressure test. All welded piping shall be fabricated and tested in accordance with the ANS Standards Code for Pressure Piping, Section 3, Petroleum Refinery Piping B-31.3, 1966 Edition or equivalent. All refrigerated piping shall :conform to the Refrigeration Piping Code, American National Standards Institute, B-31.5-1966 with addenda B-31.1a-1968 as it applies to ammonia. Hose shall not be used in lieu of piping between the tank and loading and/or unloading connection, except that a section of metallic hose, not to exceed 24 inches in length may be used in each pipeline to provide flexibility and except as provided in Section 504 (j). The manufacturer's identification required in Section 510 (b) shall be retained on each section. (b) All piping shall run as directly as practical, with suitable provi- sion for expansion, contraction,jarring, vibrations, and settling. Piping may be either buried or installed aboveground, and shall be well sup- ported and protected against physical damage. All underground piping shall be buried not less than 18 inches below the surface of the ground unless otherwise protected, and shall be adequately coated or otherwise protected against corrosion. Pipe coated as follows will be considered acceptable: C' (1) Clean and prime. (2) Coat with asphalt enamel (3) Wrap with forty-pound felt. (4) Coat with asphalt enamel. (5) Wrap with forty-pound felt. (6) Coat with asphalt enamel. (7) Wrap with Kraft paper. Equivalent wrapping will be accepted at the discretion of the Divi- sion. (c) All steel fittings used with Schedule 80 pipe shall be Schedule 80 if butt welded, 3,000 pound WOG if socket welded, and 2,000 pound - WOG forged steel if threaded. All other steel fittings shall have a rating of at least Schedule 40 if butt welded and 2,000 pound WOG if socket welded or threaded. Threaded connections shall not be seal welded. Joint compounds shall be resistant to ammonia. All other valves and fittings shall be of a type suitable for use with anhydrous ammonia and shall have a pressure rating of at least 400 psi WOG. Valve seat material, packing, gaskets, etc., shall be suitable for anhydrous ammonia service.