327 IAC 3-6-13 Force main requirements

Sec. 13. In addition to the force main requirements specified throughout this rule, the following apply: (1) Force mains must be sized to provide a cleansing velocity of at least two (2) feet per second throughout the length of the sewer at the design pumping rate. (2) Force main pipe and joint materials must be equivalent to water main strength at design conditions. (3) Air relief valves or other air relief devices must be installed at every intermediate apex point where air may accumulate in the force main. (4) Each air relief valve that exhausts above ground must be equipped with an exhaust pipe extending to a downward facing elbow covered with a corrosion-resistant, twenty-four (24) mesh screened opening at an elevation of eighteen (18) inches above ground level. (5) Air relief valves must be selected in accordance with the following: (A) Automatic air relief valves must not be used in areas: (i) within the one hundred (100) year flood plain; or (ii) where flooding may occur, such as in: (AA) a pit; (BB) a chamber; or (CC) a manhole; unless the automatic air relief valve is equipped with a downward facing exhaust pipe covered with a corrosion-resistant, twenty-four (24) mesh screened opening at an elevation of eighteen (18) inches above the ground surface and above the one hundred (100) year flood elevation. (B) Manually operated air relief valves must be used in areas: (i) within the one hundred (100) year flood plain; and (ii) where flooding may occur, such as in: (AA) a pit; (BB) a chamber; or (CC) a manhole. (6) The following reaction devices installed to prevent movement in pipes and fittings, of any material type, must be designed in conformance with Section 3.8 of AWWA Standard C600-93*, AWWA Standard for Installation of Ductile-Iron Water Mains and Their Appurtenances: (A) Blocking. (B) Tie rods. (C) Joints. *This document is incorporated by reference. Copies may be obtained from American Water Works Association, 6666 W. Quincy Ave., Denver, CO 80235, www.awwa.org, or are available for review at the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North, 100 North Senate Avenue, Thirteenth Floor, Indianapolis, Indiana 46204.