Direct Burial Pre-Insulated Steel Pipe

Product Description

Insulation steel pipes are widely used in liquid and gas transmission pipe networks, chemical pipe insulation projects in petroleum, chemical, central heating and heating networks, central air-conditioning ventilation pipes, and municipal engineering. High-temperature prefabricated direct-buried thermal Insulation steel pipe is a direct-buried prefabricated thermal Insulation steel pipe with good thermal insulation performance, safety and reliability, and low construction cost.

Specification
1. The pre-insulated steel pipe coated with high density polyurethane foam can resistant the temperature up to 140°c 
2. With the corrosion resistant HDPE jacket pipe can make the pipe directly buried underground without trench.
3. Different size pipe and pipe fittings can service for different heating and cooling project.
4. The polyurethane foam thickness can be designed from 26.5-83mm or more.

Applications-Pre-insulated pipe system are used by the chemical, pharmaceutical, petro-chemical and food industries for the transport of:

1. District heating networks
2. District cooling networks
3. Chilled water, Drinking water, Waste water, Cooling water, Hot water
4. Steam & condensate lines
5. Process fluids
6. Refrigerants
7. Chemicals
8. Oil

A pre-insulated pipe normally consists of three parts

Part 1:  Carrier pipe (Inside): Stainless steel or Carbon steel
Part 2:  Insulating layer (Medium): Polyurethane foam (PUR Form) (High insulation qualities compared to mass and volume)
Part 3:  Protective jacket (Outside casing): Plastic or steel (Polyethylene (PEH), High Density Polyethylene (HDPE), Galvanized, Aluminum etc)

Pos: The choice of carrier pipe, foam type and foam thickness, as well as the material for the jacket, is made by the customer, who can also choose to supply carrier pipes for the project.

Advantages: impact-proof, watertight, resistant to salt and chemicals, hygienic and non-corrosive

Materials
Item	Material	Notes
Service pipe/Carrier pipe	Steel Pipe	API 5L PSL-1: GR.B X42, X46, X52, X60, X70 API 5L PLS-2: ISO3183-L245, L290, L320, L360, L415, L485
Insulation	Polyurethane foam (PUR)  Nominal Density of 60¹+15-15 kg/m³	Compressive Strength: ≥ 0.300 Mpa
		Thermal Conductivity: ≤ 0.029 W/m·K@50ºC
		Closed Cell Content: ≥90%
		Water Absorption: <5%
Insulation Jacket	High-density polyethylene (HDPE)	As technical parameter

Description	polyurethane thermal insulation steel pipe
Wall thickness	0.5mm-16mm
Length	1m-12m or customized
Outer Diameter	0.405-80 inch or 10.3mm - 2032mm
Insulation	PUR Foam
Operating temperature	Up to 140ºC
Standard & Grades	API 5L PSL1/ PSL2, ASTM A53,ASTM A252,GB/T9711.1,GB/T3091,SY/T 5037-2012,DIN1626,EN10219,EN10217
Ends	30~35°
Quality control	100% X-Ray inspection/ 100%X 100% Hydraulic Pressure test/ 100% 100% Ultrasonic inspection / 100%
Lining	Epoxy , cement motar,  and according to customers requirement
Operating pressure	<1.6Mpa  (Equivalent to PN 25? 25bar to be confirmed)
Laid way	Buried, overhead, trench
Insulation material	Fluoride-Free water foamed rigid polyurethane foam material  (foam density: 60kg/m3-80kg/m³)
Inner surface tension of the  high density polyethylene pipe	≥50dy/cm

   

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