Underground Direct Buried Pre Insulated Foam and HDPE Casing Steel Pipe

• Customization: Available
• Type: Welded
• Technique: ERW
• Model NO.: DH-Thermal Insulation-BWGG
• Material: Carbon Steel
• Surface Treatment: Black
• Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
• Section Shape: Round
• Filling Density: 60-90 Kg/M3
• Foam Core Density: 68.9 Kg/M3
• Thermal Conductivity: 0.029 W/(M.K)
• Radial Compressive Strength: 0.42 MPa
• Water Absorption: 5.9 %
• Obturator Ratio: 95%
• Shear Strength: 149-195 Kpa , 170ºC, 1450h
• Transport Package: by Truck, by Train, by Sea
• Trademark: DHPI
• Origin: Shandong, China
• HS Code: 3917390000
• Production Capacity: 500000 Kilometers /Year

Product Description

Product Description

Polyurethane-foam tubing is most often used to insulate central heating and domestic-water pipelines. This material is resistant in the temperature range -50°C to 135°C, and has a low heat-transfer coefficient. Such a thermal insulator is rigid, and perfectly protects pipes from damage. Tubing made of polyurethane foam is distinguished by its high level of resistance to chemicals. It comes in a soft, hard, and super-hard versions.We have different production processes.
 

1.One-step method.
Rigid polyurethane spray polyethylene wrapped prefabricated direct-buried insulation pipe adopts advanced polyurethane spray polyethylene winding online forming technology, which improves the uniformity of foam density and consistency of insulation layer thickness, saves materials, reduces labor costs, and is suitable for Transport hot water with a temperature not higher than 140°C.

2.The two-step method.
Using a no bracket foaming patform.Compared with the traditional two-step method of insulation pipe,to avoid the emergence of the "bracket thermal brige" prolem,the axis eccentricity is small,to ensure the long-term temperature resistance of the insulation pipe.

Product Parameters

Working Steel Pipe Diameter mm	Outer Sheath Diameter mm	Minimum thickness of outer sheath mm	Insulation layer thickness mm
426	494-554	4.0	30-60
478	547-607	4.5	30-60
529	598-658	4.5	30-60
630	700-760	5.0	30-60
720	790-850	5.0	30-60
820	891-951	5.5	30-60
920	992-1052	6.0	30-60
1020	1093-1153	6.5	30-60
1120	1194-1254	7.0	30-60
1220	1316-1436	8.0	40-100
1420	1538-1678	9.0	50-120
1620	1760-1880	10.0	60-120
1820	1960-2080	10.0	60-120
Note: can be customized as customer's needs.

Connection Method

Appliation Cases

Our Advantages

1. There is no need for support, less heat loss, and the phenomenon of "support thermal bridge" completely disappears;
2. High strength, good toughness, easy welding, convenient construction;
3. Low thermal conductivity, with strong waterproof and corrosion resistance, can be directly buried in the ground or water;
4. Easy connection, can be used flange, quick joint connection;
5. Long service life, can be used in -20ºC ~ 120ºC environment for more than 30 years.

Company Profile

Shandong Donghong Pipe Industry Co., Ltd. (referred to as: Donghong Co., Ltd., stock code: 603856) is headquartered in Qufu, China, the hometown of Confucius.Is an engineering pipeline manufacturer, pipeline engineering service provider and pipeline engineering general contractor with the main business of four categories of functional and customized pipelines: special pipelines for rainwater and sewage diversion, special pipelines for municipal areas, special pipelines for industrial and mining areas, and special pipelines for national key engineering projects. The company has built up an industrial ecosystem with the participation of design institutes, financial institutions,  port logistics, construction units, upstream and downstream enterprises, etc. The company is committed to becoming a global leading pipeline system comprehensive solution provider by making intelligent pipelines change human life and constant safety of pipeline transportation.

 

Donghong has more than 200 R&D personnel and more than 100 patents. Relying on national enterprise technology  center, national CNAS laboratory, academician expert workstation, post-doctoral workstation and other national technology R&D platforms, Donghong deepens the research on digitalization, informatization and intelligentization of pipeline engineering and leads the development of engineering pipeline industry.
 

 

Certifications

FAQ

1. Is your product meets the international standard ?
Our products have pass CE, BV, ISO and wars certificate, and all figures indicates higher than standard, you can feel free to let us know which national standard you required, we will check or test it for you.

2. What kind of service do you offer ?
As a manufacture fatory, we provide pipe products, pipe fittings, package and shipping; as a professional consulation company we provide project consulting advise, pipe system solutions and design suggestions; as an engineering focused enterprise , we also provide pipeline contractor service and pipe repair service, also can give free maintance guidance.

3. Do you support OEM/ODM service?
Yes, we offer customization in material, specification, logo, package , connection methods andothers. Meanwhile, our professional team can offer solution suggestion for your specified projects, we have successfull cases of that service.

4. What's your terms of payment?
T/T or L/C at sight.

5. How can you gurantee the goods you offered is qualified?
We warmly welcome all customers arrange the visit to our company and see our goods in sight, we can also provide strict test as per customer required before order. Meanwhile, before the bulk production, we can dispatch samples for customer to do their own tests to qualify the products.