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2 .2. 5 . Fittings <br /> Description Cont'd) <br /> ' i e fittings have been manufacturedrttin <br /> The manufacturer shall furnish a sworn statement that the p p g <br /> in accordance with AWWA C110 or AWWA C153 and that the fittings fiunished have been <br /> inspected, tested and that all tests required by AWWA C110 or AWWA C153 have been made <br /> and the results thereof comply with the requirements of the standard. All fittings shall be clean <br /> and sound without defects . Repairing of defects by welding or other methods shall not be <br /> permitted. Fittings and accessories not in compliance with AWWA C110 or AWWA C153 shall <br /> not be accepted by the Contractor and shall be replaced by the manufacturer. <br /> All gray iron or ductile iron pipe fittings furnished under this Contract shall be externally coated <br /> with a bituminous coating approximately 1 mil . thick. <br /> The coating shall be applied to the outside of all pipe unless otherwise specified. The finished <br /> external coating shall be continuous, smooth, neither brittle when cold nor sticky when exposed <br /> to the sun and shall be strongly adherent to the pipe. <br /> Each fitting furnished shall have distinctly cast upon them the manufacturer's identification, <br /> pressure rating, nominal diameters of openings and the number of degrees of fraction of the circle <br /> on all bends. Ductile iron fittings shall have the letters "DI" or "Ductile" cast on them. All <br /> required markings shall be clear and legible. Any fitting not marked as specified shall be rejected <br /> and removed from the site. Push-on joint rubber gaskets, mechanical joint rubber gaskets, <br /> ductile iron glands or gray iron glands, bolts and nubs shall be in accordance with ANSI A21 . 11 <br /> (AWWA C111 ) American National Standard for Rubber-Gasket Joints for Ductile Iron and Gray <br /> Iron Pressure Pipe and Fittings . <br /> All plugs, caps, tees and bends, unless otherwise specified, shall be provided with suitable <br /> restrained joints, as shown on the plans or specified by the Engineer. <br /> All thrust restraint shall withstand the test pressure or the working pressure plus surge allowance, <br /> whichever is larger, including adequate factors of safety. <br /> Vertical and horizontal thrust blocks shall be made of concrete having a compressive strength of <br /> not less than 3000 psi after 28 days. Concrete thrust backing shall be placed between solid <br /> ground and the fitting to be anchored; the area of bearing on the pipe and on the ground in each <br /> instance shall be that shown or directed by the Engineer. The backing shall, unless otherwise <br /> shown or directed, be so located as to contain the resultant thrust force and in such a way that the <br /> pipe and fitting joints will be accessible for repair. <br /> Restraining mechanisms for push-on or mechanical joints shall be used in conjunction with <br /> concrete backing if so indicated in the plans and specifications. Clamps or other components of <br /> dissimilar metal shall be protected against corrosion by hand application of a suitable coating. All <br /> tie rods shall be 3/4 " diameter, all thread stainless steel rods. <br /> 17 <br />