City of Frisco Engineering Standards

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Engineering Standards Version 6/19/12 3. Isolation valves shall not be over 500’ apart in all other non-residential areas on lines 12” and smaller. For lines 16” and larger, valves shall not be over 1000’ apart. 4. Two isolation valves shall be placed such that only one fire hydrant/fire fighting apparatus and one fire sprinkler private service system is shut down at a time. No more than three isolations valves shall be used to shut down the combined fire hydrant/fire fighting apparatus and fire sprinkler system private service main. 5. Water mains supplying an automatic fire sprinkler system shall include isolation valves on the private fire service main. 6. Isolation valves shall not be located in parking spaces. 7. In undeveloped areas, main line isolation valves shall be spaced every 1,200’ and adjacent to fire hydrants. B. Air Release Valves 1. The Engineer shall be responsible for locating and sizing air release valves in accordance with AWWA Manual M51: Air-Release, Air/Vacuum & Combination Air Valve. 2. Air release valves shall be installed on water mains larger than 12”. Vent pipes shall discharge air above grade and above 100-year floodplain elevation if applicable. 3. Air valves are not required on water distribution mains smaller than 12” where fire hydrants and service connections provide a means for venting trapped air. 4. Air valve manholes shall not be located in parking spaces. C. Blowoff Valves 1. Blowoff valves shall be provided on water mains 16” and larger, at low points and at isolation valves where the water main slopes toward the valve. 2. Blowoff valves shall discharge to a drainage channel, creek, storm sewer or culvert. 5.1.9 Fire Hydrants Fire hydrants shall be provided as recommended by the “GUIDE FOR DETERMINATION OF REQUIRED FIRE FLOW” published by the Insurance Service Office. The following minimum guidelines shall be met: A. Fire hydrants shall be installed at a minimum of 10’ from the curb return on Thoroughfare Types A, B, and C. B. Fire hydrants shall be installed at a minimum of 2’ and a maximum of 6’ from the edge of pavement on Thoroughfare Types D, E, and F and fire lanes. C. Fire hydrants shall be located at all main entrances and intersecting streets and fire lanes. D. Fire hydrants shall be spaced every 1200’ along undeveloped roadways. E. Fire hydrant leads exceeding 100’ shall be looped with a minimum 8” line. Section 5 – Water & Wastewater Design Requirements May 2012 Page 5-6
Engineering Standards Version 6/19/12 F. Fire hydrants shall be provided every 500’ within residential developments as measured along the route that a fire hose is laid by a fire apparatus. G. The fire hydrant shall not be located in the sidewalk. H. Fire hydrant valves shall be positioned to one side of the fire hydrant pumper nozzle. I. Fire hydrants required to supplement water supply for automatic fire protection systems shall be located within 100’ of the Fire Department connection for such system. J. Additional requirements for fire hydrant installation adjacent to, and along fire lanes is as follows: 1. Multi-family a. Fire hydrants shall be located every 300’ as measured along the route that a fire hose is laid by a fire apparatus. b. Fire hydrants shall be located outside the radius of the fire lane and at least 35’ from all buildings. c. A minimum of two fire hydrants shall be located within 500’ of the front of any building as measured along the route that a fire hose is laid by a fire apparatus. 2. Commercial a. Fire hydrants shall be located within 150’ of the main entrance. b. Fire hydrants shall be located outside the radius of the fire lane and at least 35’ from all buildings. c. A minimum of two fire hydrants shall be located within 300’ from the front of any building as measured along the route that a fire hose is laid by a fire apparatus. K. 6 inch water mains shall be installed such that not more than one hydrant will be between intersecting lines. L. 8” water mains shall be installed such that not more than two fire hydrants will be between intersecting lines. M. Fire hydrants on private property shall be located within easements and protected by curb stops or bollards, the maintenance of which shall be the responsibility of the property owner. The property owner is responsible for keeping the curb stops or bollards in place. N. Fire hydrants on private property shall be accessible to the Fire Department at all times. O. Fire hydrants location is subject to approval of Fire Department. 5.1.10 Connections to Existing Water Mains A. Connections to 12” water mains and larger shall be made with a pipe a minimum of one size smaller than the line being tapped. Section 5 – Water & Wastewater Design Requirements May 2012 Page 5-7
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City of Frisco Engineering Standards

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