SECTION 252:626-19-1. General

(a)   Pressure Requirements. Design the distribution system to provide a minimum of 25 psi throughout the distribution system under normal operating conditions including peak demand and fire flows where fire protection is provided.

(b)   Hydraulic analysis. Submit a hydraulic analysis of the system that demonstrates:

(1)   a minimum of 25 psi shall be maintained throughout the distribution system during peak demand, and

(2)   that flows are calculated at not less than one (1) gallon per minute per service connection.

(c)   Standards. All materials, including piping, fittings, valves, fire hydrants, gaskets, packing and other joint materials shall meet the latest specifications issued by the AWWA, ASTM, ANSI, NSF, or the federal government.

(d)   Dead ends. Minimize dead ends by looping of all mains whenever practical. Where dead end mains occur, provide an approved flushing hydrant or blow-off for flushing purposes. Do not connect flushing devices directly to any sewer. A fire hydrant is an approved flushing device.

(e)   Air relief and blow-off valves. Locate air relief valves at high points in lines where air can accumulate. Do not use automatic air-relief valves where flooding of the valve exhaust may occur. Locate sufficiently sized blow-offs at low points of large mains to effectively remove accumulated sediments. Extend the open end of the exhaust line from automatic valves to at least 1 foot above grade and terminate with a screened, downward-facing elbow. Do not connect air reliefs or blow-offs directly to any sewer.

(f)   Enclosure drainage. Do not connect chambers, pits or manholes containing valves, blow-offs, meters or other appurtenances to a distribution system directly to any storm drain or sanitary sewer. Drain chambers or pits to the surface of the ground where they are not subject to flooding by surface water, or to underground absorption pits.

[Source: Added at 18 Ok Reg 1612, eff 6-1-01; Amended at 25 Ok Reg 2304, eff 7-11-08]