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(3) Must incorporate all recommended practices for single-walled <br /> tanks listed in a, b, or c above for corresponding material(s) of <br /> construction. <br /> (a) , Cathodically protected steel . <br /> 1 . Standard inner tank. <br /> 2. Outer tank - minimum 10 gauge fiberglass clad steel . <br /> 2. PIPE, FITTINGS AND PUMPING SYSTEMS. <br /> a. Pipe Materials. <br /> (1 ) Cathodically protected galvanized or coated steel . <br /> (a) Galvanic or impressed current. <br /> (b) Monitored and designed as in I-2b and c. <br /> (2) Fiberglass Reinforced Plastic. <br /> (a) Requires fully compacted bedding and extra caution in <br /> handling and installation. <br /> (b) UL listed as approved for underground petroleum products <br /> services. <br /> (3) Stainless Steel . <br /> (a) Schedule 10, Type 304 if joints are welded. <br /> (b)( Schedule 40 for screwed fittings. <br /> (4) Double-Walled. <br /> (a) Piping of choice for situations involving very hazardous or <br /> toxic liquids or in instances of severe environmental sensitivity. <br /> (b) Interstitial space is slightly pressurized and monitored <br /> for pressure drop. <br /> (c) Manufacturer's recommendations on corrosion protection must <br /> be closely followed. <br /> b. Fittings. <br /> (1 ) Swing joints (in addition to ,usual elbows and couplings) should <br /> be used at all changes in direction (required for fiberglass reinforced <br /> plastic pipe only for short pipe runs or sharp turns); expansion joints are <br /> not acceptable underground. <br /> (2) Manufacturer's specifications should be consulted for joining <br /> methods of double-walled pipe. <br /> 3 <br />