It's snowing in the north, you must pay attention to pipeline construction in winter!

一、Floor heating pipe

For the construction of low-temperature hot water floor radiation heating projects, the ambient temperature should not be lower than 3°C. When PE-RT pipes are used as heating pipes, the ambient temperature should not be lower than 0°C. When constructing in an environment below 0°C, a heat source should be used to increase the ambient temperature on site.

For floor heating pipes, such as PE-RT, PB, and oxygen barrier pipes, after the pressure test, a small air compressor should be used to blow off and dry the water in the pipes in time.

二、Precautions for PPR Winter Construction

Winter is a frequent season for pipeline construction accidents. Due to the material properties of PPR itself, when the temperature is low in winter, it is prone to rupture and fracture of pipes and fittings in different degrees during a series of processes such as construction, loading and unloading, and transportation. In this environment, it not only has a greater impact on pipeline construction, but also increases the difficulty of construction. In order to ensure the safety of user pipeline construction and effectively prevent the trouble and unnecessary loss caused by water leakage in winter pipeline construction, Weixing PPR is now The precautions for pipe construction in winter are summarized as follows, and users are expected to pay attention to strict implementation.

1. The properties of PPR material show low temperature brittleness at low temperature. Under the action of external force, when the external force is greater than its bearing limit, it is very likely to cause rupture and other phenomena. The national "Technical Specification for Building Water Supply Polypropylene Pipeline Engineering" GB-T53046-2005 has a detailed description of this, so in winter construction should pay attention to the cold brittleness of PPR.

The main manifestation: different parts of the force produce different ruptures. The pipe rupture is mainly caused by strong external force impact during transportation or construction. Generally, the appearance is not easy to detect, and it often appears at the joints of pipe fittings, which is mistaken for welding quality problems and trachoma. Due to the external force, the cracks are tightly stretched outside and inside. Generally, they can withstand the water supply pressure of 2-4KG, and mistakenly believe that there is a problem with the welding quality. Sometimes users do not find the leaking line in a short period of time after the pipeline is filled with water, and the water leaks after a period of time. Before connecting the pipe, the damaged part should be removed from the end, and the water pressure test of the pipe should be done in time after installation.

2.Pipe handling. PPR pipes are very brittle at low temperatures. Therefore, they must be handled with care during transportation, handling, and handling. Throwing, dropping, dragging, rolling, etc. are strictly prohibited. At this time, the pipes and fittings rupture and hidden injuries are not easy to find, and the problems can only be found through the hydraulic test.

3.PPR welding temperature is 260±10 ℃. Welding at excessively high temperature is strictly prohibited, because high temperature will carbonize the welded joint and deteriorate the polymer material, and it is difficult to find water leakage even at the hydraulic test interface. There will be water leaks in the near future or three months or even three years. Therefore, the welding temperature is the key to the quality of pipeline welding. When the temperature is lower than 5℃, protective measures should be taken to adjust the welding heat absorption time. Generally the heat absorption time is extended by 50%.

4.hydrostatictest. After the pipeline is installed, do a water pressure test in time. The cold water pipe pressure test is 1.5 times the working pressure, but not less than 0.9MPA, and the hot water pipe pressure test is 2 times the working pressure, but not less than 1.2MPA. The voltage stabilization time is 30 minutes, and the water in the pipeline should be discharged in time after the water pressure test in winter. If there is no reliable thermal insulation measures in winter when no water is used for a long time, the water in the pipeline should be drained to prevent freezing and cracking of the pipeline.