Cautions for Polyurethane Insulation Pipe
1. We must really understand that the direct burial laying of heating pipelines can be divided into two types: compensated direct burial laying and uncompensated direct burial laying, which are planned and constructed. Indeed, we should grasp the operating principles, characteristics and application sites of the two modes so as to make rational selection in planning and safe, reliable and economical construction.
2. Careful inspection after entering the site. Before construction, it is necessary to investigate the manufacturer of prefabricated direct-buried insulating pipes. Refuse to use unqualified heat preservation tubes.
3. Polyurethane insulation pipe welding is a key operation to ensure the quality of the project, which is in the construction of prefabricated directly buried pipelines.
4. The construction quality of various wellbores directly affects the engineering quality and the service life of pipelines, and fixes the brackets. If the waterproofing of the well chamber is not good, the parts will be damaged by immersion. Therefore, careful construction should be carried out to ensure the quality of construction.
5. Under satisfactory suppression conditions, attention must be paid to the suppression of prefabricated directly buried insulation pipelines. Firstly, the water is irrigated to drain the clean air, and then it is done in two steps: no leakage within 10 minutes of voltage stabilization. Strength test: after raising the pressure in the pipeline to 1.5 times of the working pressure; knock the welds around the weld with a 1 kg hammer one by one, tightness test: when the pressure in the pipeline is reduced to the working pressure, 30 minutes without leakage and pressure drop not exceeding 0.2 atmospheric pressure is qualified; pressure test records should be made according to the standard requirements.
6. Because the prefabricated directly buried insulating pipe is buried underground, engineering inspection. Most of them belong to shade works. If the completion inspection is not careful and the completion data are not specific, it will affect the future application.
7. Joint, backfill should be tested in pipeline. Completion survey can only be carried out after cleaning, and must be backfilled with regular thickness sand according to the construction characteristics of polyurethane insulating pipe. No Jerry work or material reduction is allowed.
8. Attention must be paid to it. The field joint insulation of prefabricated directly buried insulating pipe must be carried out after qualified pressure test, and the field joint insulation construction. This content is that the construction quality of prefabricated directly buried insulation pipeline has a direct impact on its service life. There are two ways to construct insulation layer: foaming construction on site and insulation tile construction. No matter which method is chosen, there are no defects such as annular space, cracking and delamination. There are many ways of protecting layer (such as high density polyethylene and fiberglass reinforced plastic protective layer), but the integrity, tightness and waterproof of of joint must be guaranteed. The slow starting speed of polyurethane insulating pipes usually occurs in autumn and winter or in the morning construction, because the temperature suddenly drops or the temperature is low.
This article is provided by Shandong Hipper Pipe Technology Development Co., Ltd. To learn more about polyurethane insulation pipe manufacturers, please pay attention to our website: https://www.sdhpgy.com Thank you!
