Pipeline failure and maintenance-5

Release time:

2024-04-18

How to repair the water supply pipeline?

2) When the water supply pipe on the ground leaks, if it is found that there is no leakage at the joint, there must be cracks or holes in the pipe body. At this time, it is necessary to find the defect and take repair measures according to the severity of the defect. If the defect is serious and it is difficult to repair, water shall be cut off to replace the pipe section; if the defect is not serious, it can be repaired by means of plugging with adhesive or punching clips.

3) When the underground water supply pipeline leaks, if it is not too serious, it can be blocked with waterproof cement glue; when the pipeline leaks seriously and cannot be blocked with waterproof cement glue, it is necessary to stop the water and replace the damaged pipe section, or repair it with mechanical method. The repairing methods include repair welding, clip making and sleeve connecting.

How to freeze the water supply pipeline?

A: in cold areas, when the water supply pipeline is laid above the soil freezing line, the water in the pipe will freeze and freeze, which will cause the pipe to crack. The main way to prevent water pipe from freezing is to strengthen the heat preservation. After the buried pipeline is covered with appropriate thickness of slag, expanded perlite powder and other thermal insulation materials on the top of the pipe, it will be backfilled, and the thermal insulation effect is relatively significant.

The exposed pipes, valves, fire hydrants, etc. shall be insulated with appropriate insulation materials. If necessary, control valve and drain valve shall be set at the lowest point of the pipeline. After use, the water storage in the pipeline and equipment shall be discharged to the outdoor tap water in cold area. Antifreeze water hydrant shall be used. In temporary water use places such as construction site, underground valve can be set near the water consumption point for control. After closing, the water storage in the riser shall be discharged by the drainage tee in the well.

How to clean the water supply pipeline?

Answer: due to the influence of water supply quality, medium flow rate in the pipe and pipe network laying form and other factors, soft or hard sediments of different degrees are often produced on the inner wall of the water pipe, so as to increase the resistance of the pipe, reduce the water delivery capacity and sometimes affect the water quality. Therefore, the water pipe must be cleaned regularly.

The method to remove the sediment in the water supply pipe is generally determined according to the nature of the sediment. For soft sediment, it can be washed with high speed water. The flow rate of flushing water shall be 3-5 times higher than the maximum flow rate during operation, but the pressure shall not exceed the allowable pressure. The length of each cleaning section is 100-200m. Cleaning should be carried out frequently, otherwise the sediment will become hard shell due to hydrolysis, friction and other effects.

When flushing the pipeline, close the valve on each pipeline connected with the flushing pipe section first, and water will enter from one end, and the waste water will be discharged from the discharge outlet, valve shell, temporarily installed riser or by fire hydrant. If compressed air is used to assist in cleaning, the flow rate in the pipe can be increased, and the effect will be better.