(A) All ductile iron pipe shall be class 50, 51 or 52 designed in accordance with AWWA Standard C-150. Design shall be done for external and internal pressures separately, using the larger of the two for the next design thickness. An additional allowance shall be made for corrosion and casting tolerances. The thickness design for external and internal pressures shall use the following conditions:
(1) Three feet minimum cover and maximum cover as shown on the plans;
(2) Laying condition - type 1;
(3) A minimum working pressure of 150 psi; and
(4) A surge pressure of an additional 100 psi.
(B) The minimum class thickness shall be class 50.
(C) The ductile iron pipe shall be manufactured in accordance with all applicable requirements of AWWA Standard C-151. The ductile iron pipe shall be supplied in nominal lengths of 18 or 20 feet.
(D) The ductile iron pipe shall be cement-mortar lined with a sealcoat in accordance with AWWA C-104 and bituminous coated in accordance with AWWA C-151.
(E) Pipe joints shall be mechanical or push-on manufactured in accordance with AWWA Standard C-111.
(F) Each joint of ductile iron pipe shall be hydrostatically tested of 500 psi at the point of manufacture before the outside coating and inside lining are applied. Testing may be performed prior to machining bell and spigot.
FAILURE OF DUCTILE IRON PIPE shall be defined as any rupture or leakage of the pipe wall.
(G) All materials used in the production of the pipe are to be tested in accordance with AWWA Standard C-151 for their adequacy within the design of the pipe and certified test results are to be provided to the town upon request. All certified tests, hydrostatic and material, are to be performed by an independent testing laboratory at the expense of the pipe manufacturer.
(H) Push-on and mechanical joint pipe shall be as manufactured by the American Cast Iron Pipe Company, United States Pipe and Foundry Company, Griffin Pipe Products Company, McWane Case Iron Pipe Company.
(I) Restrained joints shall be TR Flex or Lok Tyte as manufactured by U.S. Pipe, Lok-Fast or Lok-Ring as manufactured by American Pipe or Super-Lock as manufactured by Clow. Restrained joints shall be used when the pipe location excludes the use of thrust blocks for proper support.
(Ord. passed 6-21-2011)