 |
Oklahoma Administrative Code (Last Updated: March 11, 2021) |
 |
TITLE 252. Department of Environmental Quality |
|
Chapter 626. Public Water Supply Construction Standards |
|
Subchapter 19. Distribution System |
SECTION 252:626-19-3. Water main design for all systems providing fire protection
Latest version.
- (a) Sizing of mains. Size all lines after a hydraulic analysis pursuant to the International Fire Code, published by the International Code Council, Inc., 2003 Edition, Distribution System Requirements for Fire Protection, M 31, published by the AWWA, 3rd Edition or other recommendations of similar organizations for the fire service area. The minimum main size is 6 inches in diameter.(b) Hydrants.(1) Fire hydrants must have a 4-1/2 inch pumper outlet and at least two 2-1/2 inch hose outlets.(2) Fire hydrants shall only be connected to water systems and mains designed to carry fire-flows.(3) Locate and space hydrants pursuant to the International Fire Code, published by the International Code Council, Inc., 2003 Edition, Distribution System Requirements for Fire Protection, M 31, published by the AWWA, 3rd Edition or other recommendations of similar organizations for the fire service area.(4) The minimum hydrant lead size is 6 inches in diameter.(5) Provide a shut-off valve to allow hydrant maintenance or replacement.(6) The lowest outlet shall be installed no less than 18 inches above the surrounding grade and the operating nut higher than 4 feet above grade.(7) Drains from fire hydrant barrels shall not be connected to sanitary sewers or storm drains.(c) Valves. Install valves on all small distribution lines branching from larger mains. Locate positive closing valves for isolating a line so that a single break will:(1) require no more than 500 feet of pipe be removed from service in high-service areas,(2) require no more than 1,320 feet in other sections, and(3) not require shutting down an artery.