Should fire hoses be buried two meters underground?
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The fire water pipes are buried two meters underground; the water does not flow, and the pressure is around 4 kilograms. In the northeast, the lowest temperatures can reach minus 35 degrees. Can pipes freeze and crack under such conditions? I’d like to hear everyone’s opinions
Then you need to check the local depth of permafrost; at -35 degrees, it’s possible that it exists two meters underground as well.
2# is correct; it depends on the local permafrost layer and minimum temperatures. In Baishan, Jilin, the underground pipelines for Sheng methanol seem to be more than 1 meter deep, but it’s hard to say whether they reach 2 meters
Check the local relevant regulations; there are provisions for this.
What was said upstairs is correct; this is related to the depth of the permafrost as well as to the design. If it is necessary to ensure that the piping system remains filled with water at all times, then it must be buried below the permafrost layer. As defined by the term permafrost, even though the surface temperature may be -35 degrees, the temperature below the permafrost layer remains above 0 degrees, so the pipes will not freeze and crack. This is why the design requires the pipes to be buried at a depth of at least 2 meters. However, the design can also take into account the need to fill the entire fire protection piping system with water within a certain time period in case of a fire; in such cases, the pipes can be designed to be drained of water during winter, thereby avoiding the need to bury them below the permafrost layer. It is still necessary, however, to ensure that the fire protection system can respond promptly in case of a fire, that is, to have the pipes filled with water within the specified time frame, and relevant standards set limits for this time period.
In the northeast, the depth of the permafrost is generally below 1.8 meters; fire hoses are buried at a depth of two meters to prevent freezing!