Steel sleeve steel steam insulation pipe

Polyurethane direct buried insulation pipe is divided into three layers from inside to outside:

First layer: The working steel pipe layer generally uses seamless pipes (GB8163-87) and spiral welded pipes (GB9711-88) according to the design and customer requirements; SY/T5038-92) and straight seam welded pipe (GB3092-93). After the surface of the steel pipe is treated with shot blasting and rust removal technology, the rust removal grade of the steel pipe can reach Sa2 level in GB8923-1988 standard, and the surface roughness can reach R=12.5 microns in GB6060.5-88 standard.

Second layer: the polyurethane insulation layer 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 at one time. It is commonly known as the "pipe in pipe foaming process". Its functions include waterproofing, insulation, and supporting the self weight of the heating network. When the temperature of the conveying medium is -50 ℃ 120 ℃, rigid polyurethane foam is selected as the insulation layer.

Three layers: The high-density polyethylene protective layer is prefabricated into black (yellow) plastic pipes with a certain wall thickness, which serves to protect the polyurethane insulation layer from mechanical hard objects and prevent corrosion and waterproofing.

Steel sleeve steel steam insulation pipeStructural form: Prefabricated buried steam insulation pipe consists of core tube (working steel pipe) rent reduction layer, insulation layer, reflection layer, fastening steel strip, sliding bracket, air layer, outer protective steel pipe, and spray coatingComposed of urethane and wrapped fiberglass.

Steel sleeve steel steam insulation pipeUsing steel pipes as the outer protective layer has high strength. Due to its resistance to damage and ability to withstand large upper loads, anti-corrosion treatment is required for the steel outer casing to achieve a long service life.The rolling support structure is designed reasonably, with low rolling friction and reduced force on the fixed support. Its mechanical analysis principle is simple, and the stability and safety of the pipeline are greatly improved.The vacuum layer eliminates heat conduction and convection in the air layer, greatly reducing heat loss. Compared with the air layer structure, it can be reduced at the same insulation thicknessThe outer wall temperature is 8-13 ° C.

The vacuum pumping device has solved the problem of the inner wall of the outer steel casing being easily corroded by hot and humid air, greatly improving the operating life of directly buried steam pipelines. The product lifespan has been extended to 30 years.The vacuum pumping device * solves the problem of having to install a pair of moisture pipes every 50-60m in the air layer structure, greatly reducing the damage rate of the outer sleeve and making the pipelineThe route is more aesthetically pleasing. At the same time, the increased cost due to the installation of the tidal discharge pipe has been reduced by about 50/m.