Orange County NC Website
Browse       Search
9/2/2020 <br /> <br />33 41 00 STORM UTILITY DRAINAGE <br />PIPING <br />Page 2 of 3 <br />3.2 PIPING INSTALLATION <br />A. General Locations and Arrangements: Drawing plans and details indicate general location and <br />arrangement of underground storm drainage piping. Location and arrangement of piping layout <br />take into account design considerations. Install piping as indicated, to extent practical. Where <br />specific installation is not indicated, follow piping manufacturer's written instructions. <br />B. Install piping beginning at low point, true to grades and alignment indicated with unbroken <br />continuity of invert. Place bell ends of piping facing upstream. Install gaskets, seals, sleeves, and <br />couplings according to manufacturer's written instructions for use of lubricants, cements, and <br />other installation requirements. <br />C. Install manholes for changes in direction unless fittings are indicated. Use fittings for branch <br />connections unless direct tap into existing sewer is indicated. <br />D. Install proper size increasers, reducers, and couplings where different sizes or materials of pipes <br />and fittings are connected. Reducing size of piping in direction of flow is prohibited. <br />E. When installing pipe under streets or other obstructions that cannot be disturbed, use pipe-jacking <br />process of microtunneling. <br />F. Install gravity-flow, nonpressure drainage piping according to the following: <br />1. Install piping pitched down in direction of flow. <br />2. Install piping to invert inverts shown on Drawings. <br />3. Install piping per local, state and manufacturer recommendations. <br />3.3 STORM DRAINAGE STRUCTURES <br />A. General: Install junction boxes, catch basins and drop inlets according to local, state and <br />manufacturer recommendations. <br />B. Install precast concrete manhole sections with sealants according to ASTM C 891. <br />C. Where specific manhole construction is not indicated, follow manhole manufacturer's written <br />instructions. <br />D. Set tops of frames and covers flush with finished surface of manholes that occur in pavements. <br />Set tops 3 inches above finished surface elsewhere unless otherwise indicated. <br />E. Where drop inlets are called for along the edge of proposed pavements, the drop inlet casting shall <br />be set parallel and immediately adjacent to the edge of the pavement, so as to result in a neat <br />finished appearance. <br />F. Storm structure inverts shall be constructed as shown in the Drawings. <br />G. Riser structure shall be placed at exact elevation shown in the Drawings. <br />H. Cleanout structures shall be constructed at the exact location shown in the Drawings. <br />DocuSign Envelope ID: 7D9ACD4F-8F6C-42B6-9ADB-C60032DB6D03