Sewage:

All force mains and other pressure non-treated mains shall have air and vacuum release valves installed as they are indicated on the plans.    The body of these valves shall be conical shaped to maintain maximum air gap with the spring loaded float and seal plug connection combining to ensure no contact between the sewage and the seal.     The valve shall have a double float design with the upper float being enclosed in the upper section of the valve and shall be made of polypropylene. The lower float shall be in the main body of the valve and shall be constructed of stainless steel. The body shall be constructed of non ferrous materials, and shall have a conical shaped lower body to automatically drain sewage back into the system.   All internal metal parts are to be made from corrosion resistant stainless steel, with all operating parts in the upper section to be non-metallic plastic materials.   The hinge for operation for the opening and closing of the seal on the orifice shall be made of EPDM rubber.  The rolling resilient seal shall provide smooth positive opening, closing, and leak free sealing over the fluctuation of pressure differentials.   The working pressure shall be 150 psi and tested to 225 psi.   All hardware shall be of Stainless Steel bolts and nuts with plastic washer under the bolt and the nut.   The connection on all pipelines shall be the following sizing with an isolation valve of the same size:

8-inch and smaller                                    2-inch threaded

10-inch through 16-inch                           3-inch threaded