The outer wall of large-diameter foam insulated spiral steel pipe adopts polyurethane foam insulation, and the working steel pipe adopts spiral steel pipe.

The materials of large-diameter foam insulated spiral steel pipes include Q235A，Q235B、10#、20#、Q345（16Mn）、L245(B)、L290（X42）、L320（X46）、L360（X52）、L390(X56)、L415(X60)、L450(X65)、L485(X70)、L555(X80)L290NB/MB（X42N/M）、L360NB/MB（X52N/M）、L390NB/MB(X56N/M)、L415NB/MB(X60N/M)、L450MB(X65)、L485MB(X70)、L555MB(X80)。

Polyurethane foam insulationSpiral steel pipeThe main implementation standard is 5037, but there are some projects with strict quality requirements that require the 9711 standard.

The most common specifications for large-diameter foam insulated spiral steel pipes are 219mm-3020mm, with a wall thickness ranging from 6mm to 18mm.

Polyurethane foam insulated spiral steel pipes are applied in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, and urban construction, and are one of the twenty key products developed in China. Used for liquid transportation: water supply and drainage. Used for gas transportation: coal gas, steam, liquefied petroleum gas. Used for structural purposes: as pile driving pipes, as bridges; Pipes for docks, roads, building structures, etc.

Full name of thermal insulation spiral steel pipe: high-density polyethylene plastic outer polyurethane foam prefabricated directly buried thermal insulation pipe, which is composed of working steel pipe, polyurethane insulation layer and polyethylene plastic outer protective pipe for conveying medium, and is combined outward through equipment in turn.

High density polyethylene plastic protected polyurethane foam prefabricated directly buried insulation pipe is very popular because of its excellent performance, convenient construction and long service life (30-50 years). Its structure is composed of three parts: external protection layer, insulation layer and anti leakage layer. The external protection layer is made of polyethylene jacket pipe or glass fiber reinforced plastic or other materials. There are three types of laying methods: direct burial, overhead, and trench laying.

Specification of large-diameter foam insulated spiral steel pipe:

Outer diameter mm 285

Wall thickness mm 4.4

Weight Kg 3.724

Allowable deviation mm ± 0.32

Corresponding to steel pipe outer diameter mm 219, etc ....

Corresponding insulation layer thickness mm 30

Corresponding sleeve mm 290

Characteristics of large-diameter foam insulated spiral steel pipe:

1. Reduce project costs.

2. Low heat loss, energy-saving.

3. Anti corrosion, good insulation performance, and long service life.

4. Less land occupation, faster construction, and favorable environmental protection.

5. Safe.