Polyurethane direct buried insulation pipe for heating renovation in old residential areas

Slope of polyurethane insulation pipe

When laying polyurethane insulation pipes horizontally, there should be a slope to facilitate air circulation The removal of condensate and the normal operation of the system.

1)The steam polyurethane insulation pipe pipeline with steam and water flowing in the same direction generally has a slope of0. 003Shall not be less than0. 002Slope towards the discharge point;

2)The steam polyurethane insulation pipe pipeline with reverse flow of soda water shall have a slope not less than0.005Slope towards the discharge point;

3)Hot water polyurethane insulation pipes should have0.003The slope must not be too smallF0.002The slope should be conducive to air removal.

The working steel pipe of polyurethane foam insulation pipe is the main transportation medium. In order to increase its compression resistance and corrosion resistance, its raw material is generally made of alloy. After rust removal process, the polyurethane insulation pipe buried deep below can achieve a longer service life. Working steel pipe inside polyurethane foam insulation pipe+Polyurethane foam layer(Or other insulation materials) +Polyethylene outer protective tube(This includes black jacket pipes and yellow jacket pipes, and other protective pipes can also be selected).

The three are closely connected. What is the order of production:Fixed internal working steel pipe;Tie and fix the bracket of the outer protective pipe on the working steel pipe(Wooden brackets, plastic brackets, etc) ;Gradually thread the polyethylene outer protective tube corresponding to the working steel pipe from one end to the reserved ends of the working pipe15-20The centimeter welding part is suitable;Then connect the working steel pipes at both ends to the gap between the outer protective pipes(Gap refers to the thickness of the insulation layer)Fix with pre made welding flanges;After fixing the flanges at both ends, calculate the required amount of polyurethane material and start the polyurethane foaming machine to pour the raw materials(The pouring density is determined based on the actual situation and the pouring amount is determined accordingly,- -In general50- 70kg/m3It is advisable, but it can also be determined according to the engineering design requirements).

After pouring the material, remove the flanges fixed at both ends and wrap the exposed polyurethane foam layer on both ends with polyester film to protect the material from damage caused by external factors, and also facilitate on-site installation and welding in the later stage. After completion, the finished pipe is finished.

The insulation layer of polyurethane insulation pipe refers to the insulation solution injected into its inner side, such as polyurethane solution, which we sometimes call itFoam inside the pipe. The protective layer refers to the use of polyethylene material prefabricated on the insulation pipe wall to prevent it from being damaged by other metals or hard objects. At the same time, by doing so, the insulation pipe also has good anti-corrosion and waterproof functions. The working steel pipe of polyurethane insulation pipe is the protagonist of transportation medium. In order to increase its compressive and corrosion resistance, its raw material is*Generally made of alloy and treated with rust removal technology, polyurethane insulation pipes buried deep underneath can achieve a longer service life.