Frost Depth for Static Fire Line
Frost Depth for Static Fire Line
(OP)
Dear all, forgive me for being ignorant in this community, but I am a Structural Engineer and I am in the process of building a building for my buisness. The contractor has found an extremely large vault in the path of my Fire Sprinler Supply that the city does not show in any as builts. The top of the vault is at 36" below the pavement and according to the fire officials in town the pipe has to have 36" of cover so my 4" pipe only has 32" of cover. Frost depth for everything else in my area is 30" but the fire guys say this is a static line that frost depth is deeper. The vault is 12' tall and runs through our entire frontage. The contractor says if he has to go under the vault it will be a mighty change order. Is there any approved way to insulate the pipe at a 32" cover? Also realize that this is under a road so it would have to be some kind of rigid system. Can anyone help me?
akastud
akastud





RE: Frost Depth for Static Fire Line
RE: Frost Depth for Static Fire Line
David S. Merrell, P.E.
TOR Engineering
www.TOREngineering.com
RE: Frost Depth for Static Fire Line
RE: Frost Depth for Static Fire Line
10.4.1* The depth of cover over water pipes shall be determined by the maximum depth of frost penetration in the locality where the pipe is laid.
10.4.2 The top of the pipe shall be buried not less than 1 ft (0.3 m) below the frost line for the locality.
10.4.3 In those locations where frost is not a factor, the depth of cover shall be not less than 2½ ft (0.8 m) to prevent mechanical damage.
10.4.4 Pipe under driveways shall be buried at a minimum depth of 3 ft (0.9 m).
10.4.5 Pipe under railroad tracks shall be buried at a minimum depth of 4 ft (1.2 m).
10.4.6 The depth of cover shall be measured from the top of the pipe to finished grade, and due consideration shall always be given to future or final grade and nature of soil.
10.5 Protection Against Freezing.
10.5.1* Where it is impracticable to bury pipe, pipe shall be permitted to be laid aboveground, provided that the pipe is protected against freezing and mechanical damage.
10.5.2 Pipe shall be buried below the frost line where entering streams and other bodies of water.
10.5.3 Where pipe is laid in water raceways or shallow streams, care shall be taken that there will be sufficient depth of running water between the pipe and the frost line during all seasons of frost; a safer method is to bury the pipe 1 ft (0.3048 m) or more under the bed of the waterway.
10.5.4 Pipe shall be located at a distance from stream banks and embankment walls that prevents danger of freezing through the side of the bank.
kinda looks like you have a problem also t=in that it is suppose to be 36 inches under a driveway
RE: Frost Depth for Static Fire Line
David S. Merrell, P.E.
TOR Engineering
www.TOREngineering.com
RE: Frost Depth for Static Fire Line
David S. Merrell, P.E.
TOR Engineering
www.TOREngineering.com
RE: Frost Depth for Static Fire Line
RE: Frost Depth for Static Fire Line