Specifications: diameter: 320 to 127 mm thickness: 0.4 to 12.7 mm Length: 6 m above, and, in accordance with customer demand, supply and other specifications of steel pipe

insulation steel pipe


Insulation Steel Pipe: 
Standard/Material:API 5L PSL1,PSL2,Gr.B X42~X80




 SSAW Steel Pipe / Spiral Seam double-side submerged arc welded steel pipe


 NETGMS steel pipe


 API5LGr.B,X42~X80; ASTMA252 Gr.2,Gr.3; ASTMA53 Gr.B

SY/T 5037-2000;SY/T5040-2000;GB/T3091-2008: Q235B,Q345B,20#,16Mn;

GB/T9711.1-1997;GB/T9711.2-1999;GB/T9711.3-2005: L245~L555;

EN10217-1,EN10219-1,EN10224 L235,L275,L355;


DIN 1629 ST37,ST42,ST52 etc.

 Out Diameter


 Wall  Thickness



 5.8m-20m,or as customer’s requirements.

 Place of Origin


 Main Market

 Middle East,Africa,South-east Asia,USA,Canada,South America


 SAW welding


  1. Piling project
  2. heat-supply project

 3.  conveying drinking water,drainage,coal gas,fuel gas,mine slurry and other low & middle pressure fluids

 4.  API5L Petroleum and natural gas pipeline

 5.  Chemistry industry

 6.  Electric power engineering circulating pipe


1.Bundle packing or in bulk,

2. Beveled or plain ends as per buyer's request,

3. Marks: as per customer's request,

4. Surface treatment: with or without varnish/Epoxy resin/3PE/3PP/FBE/

Epoxy Marine Lining or coating,

 5.  Metal or plastic protecting caps at pipe ends

 Delivery Time

about 20days after receipt of irrevocable L/C at sight or 30% deposit


by X-Ray flaw-detecting ,on-line or off-line Ultrasonic flaw detecting; Hydrostatic pressure inspection


Mechanical properties testing,Chemical composition analysis

 Insulation Steel Pipe


Pipe insulation
  Insulation spiral steel pipe generally is spiral steel pipe (SSAW) (longitudinally welded pipes, seamless steel pipe) for the base metal, after processing of insulation technology, to ensure that the work of steel pipe temperature under different working environment and the role of the extracellular medium and the surface temperature to meet the requirements.
Pipe insulation classification
(1) steel sets steel composite pipe insulation
Steel sets steel composite pipe insulation insulation structure based on the sliding mode can be divided into two categories:
 a, within the sliding type
  Insulation structure by the work of steel pipes, aluminum silicate, drag-reducing layer, microporous calcium silicate insulation layer, stainless steel fastening strip, aluminum foil reflective layer, polyurethane insulation jacket steel pipe, external anti-corrosion layer. The inner sliding-type pipe insulation is made of a steel pipe of the conveying medium + complex silicates or porous calcium silicate + rigid polyurethane foam the + jacket pipe + glass steel casing corrosion protection layer structure constitutes. The various fittings node thermal insulation technology is mature, reliable quality.
 b, outside the sliding type
  Insulation structure by the work of steel pipes, glass wool insulation layer, aluminum foil reflective layer, stainless steel fastening the strip, sliding guide bracket, air insulation layer, the outer casing of steel pipe, external coating composition.
(2) polyurethane pipe insulation
Transporting crude oil or heating pipes, small caliber thermal soil heat in order to reduce the pipeline to the outside of the pipe plus insulation composite layer. Commonly used insulation material is a rigid polyurethane foam, a temperature of -185 ~ 120 ℃. The soft texture of this material, to improve its strength, the outside of the insulation layer and deposited a layer of high-density polyethylene layer, forming a composite structure, in order to prevent infiltration of groundwater within the insulation layer. High voltage polyurethane foam equipment to the outer surface of the steel pipe shot blasting treatment and the outer sheath tube surface corona treatment process, improve the adhesive properties of the pipe insulation. Insulation material for the rigid polyurethane foam of density of 60kg/m3 to 80kg/m3, fully fill up the gap between the steel pipe and the casing, and having a certain degree of bonding strength, and the steel pipe, and the jacket pipe and the insulation layer between the three the formation of a solid overall. The polyurethane foam has good mechanical properties and the heat insulating properties can resist temperature up to 120 ° C, under normal circumstances, by modification, or other insulation material combinations can resist temperature up to 180 ° C.
 The a prefabricated polyurethane insulation steel pipe from the inside to the outside three separate structures:
Q235B Insulation Steel Pipe
First layer: work steel pipe layer
Design and customer requirements generally used seamless steel pipe, spiral steel pipe and pipe joints straight. Steel surface after the advanced shot blasting Process, steel pipes rusting grade the Sa2 level up to the standard GB8923-1988 surface roughness up to the standard of GB6060.5-88 R = 12.5 microns.
  Second layer: polyurethane insulation layer:
 The cavity formed between the steel pipe and the outer sheath with a high pressure foaming machine, a one-time injection of the stock solution is made of rigid polyurethane foam, commonly known as "pipe foam tube.
  Third layer: high-density polyethylene protective layer:
 The prefabricated wall thickness black or yellow polyethylene plastic pipe. Polyethylene odorless, non-toxic, feel like wax, with excellent low temperature performance, the lowest temperature up to -70 to -100 ℃, good chemical stability, the ability of most of the acid-base erosion (impatience with oxidizing properties acid), at room temperature, insoluble in common solvents, water absorption, but can slowly dissolve in some organic solvent which is a linear molecule, and does not swell, excellent electrical insulation properties. Its role to protect the polyurethane insulation from mechanical hard object damage, corrosion, waterproofing. The implementation of high-density polyethylene, polyurethane foam pipe insulation the: SY/T114-2000, and SY/T115-2001 standard.

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