Polyurethane foam insulation pipe

 Polyurethane foam insulation pipe 

The polyurethane insulation pipe has a three-layer structure:

First Layer: Working steel pipe layer:

According to the technical requirements of the conveying medium, welded steel pipes, seamless steel pipes, and double-sided submerged arc spiral welded steel pipes ,LSAW steel Pipe are used.

After the surface of the steel pipe is treated with advanced shot blasting and rust removal technology, the rust removal level of the steel pipe can reach Sa2.5 level in the GB/T8923-1988 standard, and the surface roughness can reach 40um-90um in the GB6060.5-88 standard.

Second layer: Polyurethane insulation layer:

It is made by injecting the original liquid of rigid polyurethane foam into the cavity formed between the steel pipe and the outer protective layer with a high-pressure foaming machine, which is commonly known as "pipe in pipe foaming".

Third layer: high-density polyethylene protective layer:

Prefabricated black or yellow polyethylene plastic pipes with a certain wall thickness. Polyethylene is odorless, non-toxic, and feels like wax. It has excellent low-temperature resistance, with a low usage temperature of -70~-100 ℃. It has good chemical stability and can withstand most acids and alkalis (not resistant to oxidizing acids). It is insoluble in general solvents at room temperature and has low water absorption. However, due to its linear nature, it can slowly dissolve in certain organic solvents without swelling, resulting in excellent electrical insulation performance. Its function is to protect the polyurethane insulation layer from mechanical damage, and to prevent corrosion and waterproofing. High density polyethylene polyurethane foam insulation steel pipes shall comply with the GB/T29047-2012 standard.