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2 .2 .4. Brine Main All above ground fittings shall be flanged joint. All flanged pipe barrels shall comply with the tphysical and chemical requirements as set forth in the handbook of Ductile Iron Pipe of the Cast Iron Pipe Research Association. Flanges shall be in accordance with ANSI Specifications B16 . 1 for Class 125 flanges . Bolts shall comply with ANSI Specification B 18 . 2 . Before starting fabrication of the cast iron pipe and fittings, complete detailed working drawings shall be submitted by the Contractor for approval by the Engineer. Such drawings shall show the piping layouts and contain schedules of all pipe, fittings, valves, expansion joints, hangers and supports, and other appurtenances. Where special fittings are required, they shall be shown in large detail with all necessary dimensions. The drawings submitted shall show flanged jointed sections placed so as to be removable without disturbance to the main pipe sections. Flanged pipe shall be faced and drilled to the American Standard drilling, unless special drilling is called for or required. Where tap or stud bolts are required, flanges shall be tapped. Flanges shall be accurately faced and drilled smooth and true, at right angles to the pipe axis and shall be covered with zinc dust and tallow or a rust preventive compound immediately after facing and drilling. ' Flanged pipe with screwe&on flanges shall be furnished with long hums and the flanges shall be screwed on the threaded end of the pipe in the shop and the face of the flange and end of pipe refaced together. There shall be no leakage through the pipe threads and the flanges shall be designed to prevent corrosion of the threads from outside. Flanged joints shall be made with stainless steel bolts or stud bolts and nuts. Bolts, stud bolts, and nuts shall conform to American Standard heavy dimensions, semi-finished with square or hexagonal heads and cold punched hexagonal nuts, meeting the requirements of ASTM Designation A-307. Bolt sizes shall be American Standard for the flanges specified, and bolts and nuts shall have good, true threads. All thrust restraint shall withstand the test pressure or the working pressure plus surge allowance, whichever is larger, including adequate factors of safety. ' Vertical and horizontal thrust blocks shall be made of concrete having a compressive strength of not less than 2500 psi after twenty-eight (28) days Concrete thrust backing shall be placed between solid ground and the fitting to be anchored; the area of bearing on the pipe and on the ground in each instance shall be that shown or directed by the Engineer. The backing shall, unless otherwise shown or directed, be so located as to contain the resultant thrust force and in such a way that the pipe and fitting joints will be accessible for repair. 10