North Brunswick Water Distribution Specifications

WATER DISTRIBUTION SYSTEM

1. SIZING MAINS:

Major transmission mains shall be sized in accordance with NBSD master plan or as directed by NBSD. Six (6) inch mains may be used only when interconnections at 600 foot intervals are provided. The total maximum length of six (6) inch or eight (8) inch lines, without connecting to a larger main, is one-thousand-two-hundred (1200) feet and two-thousand (2000) feet, respectively. Four (4) inch water mains are permitted on residential cul de sacs less than four-hundred (400) feet long. Where needed, lines shall be upsized to provide adequate fire flow as directed by NBSD.

2. RELATION TO SANITARY SEWERS AND STORM WATER PIPES:

Water lines shall be located at least ten (10) feet horizontally from any existing and/or proposed sanitary sewer and/or storm water lines. When local conditions prevent a ten (10) foot lateral separation, the water line shall be laid at eighteen (18) inches above the top of the sewer line or eighteen (18) inches below the bottom of the sewer line. Sanitary sewer lines (or storm water lines) that cross under (or over) water mains shall be installed with eighteen (18) inches vertical separation below the bottom (or top) of the water main. If this vertical separation is not possible, then the sanitary sewer line shall be installed using ductile iron pipe for a minimum distance of ten (10) feet each side of water main and the water main reconstructed with ductile iron pipe for a distance of ten (10) feet from the sanitary sewer line. When a water line must cross under a sanitary sewer line, both the water line and sanitary sewer line shall be constructed of ductile iron pipe with joints equivalent to water line standards, while the storm water line shall be constructed of reinforced concrete pipe, both for a minimum distance of ten (10) feet on each side of the point of crossing. Water mains should cross sanitary sewer mains at an approximate ninety (90) degree angle. Water mains and storm water mains shall have a minimum vertical separation of twelve (12) inches when horizontal separation is less than three (3) feet, unless approved by NBSD.

3. WATER MAINS:

A. Distribution system piping shall be ductile iron (DIP), polyvinyl chloride (PVC) plastic, or polyethylene (PE) pipe. All water system piping sixteen (16) inches in diameter and larger shall be ductile iron pipe. All water system piping less than sixteen (16) inches in diameter shall be PVC
plastic (conforming to AWWA C900) (DR-18) or ductile iron or polyethylene pipe. SDR21 PVC pipe will be acceptable.

B. Ductile iron pipe (DIP) shall be cement-mortar lined and enamel lined ductile iron pipe, in accordance with AWWA C104. Joints shall be push on or mechanical joint type conforming to AWWA C111 and ANSI A21.11, latest edition. Fittings shall be cast or ductile iron conforming to ANSI A21.10. All pipe which must be field cut to install fittings and other appurtenances shall be "gauged full length" to assure a uniform circular cross section. Machining, jacking, or other modifications will not be allowed in the field. When using ductile iron pipe, soil shall be tested for corrosivity as prescribed by the Engineer or by NBSD. If soil is found to be corrosive, the pipe shall be wrapped in polyethylene sheeting as required. Ductile Iron Pipe shall be designed and manufactured in accordance with AWWA C150 and C151(thickness class 50) for a laying condition Type 2 and a working pressure as follows:

C. Polyvinyl chloride (PVC) pipe shall be two-hundred (200) psi PVC pipe conforming to ASTM D2241 or C900, NSF approved. Pipe material shall be PVC 1120. Joints shall be rubber ring type conforming to ASTM D3139. Bells shall be formed integrally with the pipe, or may be made using cylindrical PVC couplings with two rubber rings. Fittings shall be molded PVC with joints similar to the pipe. Fabricated fittings using solvent welded joints will not be acceptable. Fittings may be ductile iron specially designed for use with PVC pipe.

D. Polyethylene (PE) pipe shall be high density polyethylene pipe conforming to AWWA C906. Pipe material shall be PE 3408. Joints shall be heat fused. Pipe shall be two-hundred (200) psi, DR 9.0.