Laserfiche WebLink
r <br /> 9 . 10 FLEXIBLE COUPLINGS <br /> A. Flexible couplings shall be either the split type or the sleeve type. <br /> 1 . Split type coupling shall be used with all interior piping and <br /> with exterior piping as noted . The couplings shall be <br /> mechanical type for radius groove piping . The couplings <br /> shall mechanically engage and lock grooved pipe ends in a <br /> positive couple and allow for angular deflection and <br /> ., contraction and expansion . <br /> 2 . Couplings shall consist of ductile iron , ASTM Specification <br /> A47, Grade 32510 housing clamps in two or more parts, a <br /> single chlorinated butyl composition sealing gasket with a <br /> "C" shaped cross-section and internal sealing lips <br /> projecting diagonally inward , and two or more oval track <br /> head type bolts with hexagonal heavy nuts conforming to <br /> ASTM Specification A183 and A194 to assemble the <br /> housing clamps . Bolts and nuts shall be stainless steel . <br /> 3. Sleeve type couplings shall be used with all buried piping . <br /> The couplings shall be of ductile iron and shall be per the <br /> .. Approved Manufacturer's Product List. The coupling shall <br /> be provided with stainless steel bolts and nuts , unless <br /> indicated otherwise . <br /> i <br /> 4. All couplings shall be furnished with the pipe stop <br /> removed . <br /> 5 . Couplings shall be provided with gaskets of a composition <br /> suitable for exposure to the liquid within the pipe . <br /> 6 . Ductile iron followers and middle rings conform to ASTM A- <br /> 536 , Grade 65-45- 12, NSF-61 fusion bonded powder <br /> epoxy coating , Testing per AWWA C-219 (ANSI A21 - 11 ) , <br /> Rating 200 psi working pressure per AWWA C-219 , <br /> Compounded gaskets conform to compression test ASTM <br /> D-395 Method A & B , approved for water application . <br /> 9 . 11 STEEL CASING PIPE <br /> A. Steel casings shall conform to the requirements of ASTM <br /> Designation A139 Grade "B" and shall be coated inside and <br /> outside by a black bituminous coating , minimum 5 mils thick. The <br /> casing pipes shall have the minimum nominal diameter and wall <br /> thickness as indicated below. <br /> 9 - 5 <br /> r <br />