Pre-Insulated Underground Pipe for Underground Hydronic Piping and Underground Steam Piping

• Customization: Available
• Application: Agricultural Irrigation, Chemical Transport, Industrial Processing, Oil and Gas Distribution, Wastewater Management, Water Supply, Industrial&Municipal
• certification: CE, ISO9001, ISO4427
• Model NO.: DH-The thermal insulation-BWGG
• Connection Type: Welding/Socket/Flange, Welding
• Diameter: 400mm-1800mm, Upon Your Request
• Material: HDPE and Ppu, Carbon Steel
• Temperature Range: -20℃ to 80℃
• 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
• Temperature Classification: High Temperature Piping
• MPa Classfication: Ultra High Pressure Piping
• Standard: API, En
• Cross-Section Shape: Round
• Medium: Steam
• Transport Package: Standard Package
• Trademark: DHPI
• Origin: China
• HS Code: 3917330000
• Production Capacity: 500000 Kilometers /Year

Product Description

Hot Selling Pipes
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Product Description

Steel-jacketed steam insulated steel pipe
Steel-jacketed steam insulated steel pipe is composed of an outer protective steel pipe, a steel pipe anti-corrosion and insulation layer, and an inner working steel pipe.
Steel-jacketed steam insulated steel pipe is suitable for conveying steam or other media below 2.5MPa and 350 degrees Celsius. The steel-jacketed steam insulated steel pipe uses a steel pipe as an outer protective layer, which has the advantages of high strength, not easy to damage, simple construction and maintenance, and long service life.

Application: Widely used in liquid and gas transmission pipelines, chemical pipeline insulation projects, petroleum, chemical industry, centralized heating network, central air conditioning ventilation ducts, municipal engineering, etc.

Advantages:
1. Waterproof, leakproof, impermeable, and pressure-resistant, with good sealing performance and high mechanical strength;
2. High temperature and high pressure resistance, good stability;
3. Good thermal insulation performance and low heat consumption
4. Strong anti-corrosion ability, high strength of anti-corrosion layer, not easy to damage, safe and reliable,
5. Long service life, up to more than 30 years
6. Low project cost
 

 

Product Features

1. Working steel pipe: ensure the normal flow of conveying medium.
2. Barrier, reflection layer: to ensure that the organic foam material does not enter the inorganic rigid high-temperature layer; reflection of high-temperature layer part of the heat.
3. Barrier layer: ensure the free movement of the working steel pipe for thermal expansion and contraction.
4. Thermal insulation layer: ensure the temperature of the medium, ensure the surface of the outer tube to maintain room temperature.
5. Inorganic rigid insulation layer: high temperature resistance, to ensure that the interface temperature between the organic insulation layer, to ensure that the foam is not carbonised.
6. outer steel pipe: protect the insulation layer from groundwater erosion, support the working pipe and can withstand a certain amount of external load, to ensure that the working pipe normal work.
7. Anti-corrosion layer: protect the outer steel pipe to avoid corrosive substances from corroding the steel pipe and prolong the service life of the steel pipe.

Composition structure:
Steel jacket steam insulation steel pipe insulation structure according to the sliding mode is divided into: internal sliding type and external sliding type
1.internal sliding type: the thermal insulation structure by the working steel pipe, aluminium silicate, damping layer, microporous calcium silicate, heat insulation layer, stainless steel fastening steel belt, aluminium foil reflective layer, polyurethane insulation layer, the jacket steel pipe, the outer corrosion layer.
2.Outside sliding type: the heat preservation structure consists of working steel pipe, glass wool heat preservation and insulation layer, aluminium foil reflective layer, stainless steel fastening belt, sliding guide bracket, air insulation layer, outer steel pipe, external anti-corrosion layer.

Product Parameters

  Working steel pipe

Material	Vapour temperature	Thickness of steel plate	Suitable for use
Q235B	≤300ºC	≤20mm	Working steel pipe/ outer steel pipe
20.16MN.Q345B	≤350ºC	/	Working steel pipe

 

Connection Method

 

Overhead insulation pipe

Buried insulation pipe

 

The outer protection pipe is butt-welded, and the interface welding is bottomed by argon arc welding with 100% ultrasonic flaw detection inspection. When the outer protection pipe is welded, protective measures should be taken for the completed working pipe insulation to prevent welding burns.

 

 

Appliation Cases

Zoucheng City Economic Development Zone Industrial Steam Supply Project

The project adopts the calibre 350mm overhead type high temperature steam insulation pipe, which is economical and safe, with high transport efficiency, saves construction cost for the customer and effectively solves the thermal bridge problem in the pipe network.

 

Certifications

 

Company Profile

Shandong Donghong Pipe Industry Co., Ltd.

Shandong Donghong Pipe Industry Co., Ltd. (referred to as: Donghong Co., Ltd., stock code: 603856) is a leading engineering pipeline manufacturer based in Qufu, China, the hometown of Confucius. Specializing in functional and customized pipelines, our main business includes special pipelines for rainwater and sewage diversion, municipal areas, industrial and mining areas, and national key engineering projects. We have established an industrial ecosystem involving design institutes, financial institutions, port logistics, construction units, and other key partners. Our goal is to revolutionize pipeline systems globally, ensuring the safety and efficiency of pipeline transportation.

 

Shandong Donghong Pipe Industry Co., Ltd. boasts a team of over 200 R&D experts and holds more than 100 patents. Leveraging national technology R&D platforms like the National Enterprise Technology Center and the National CNAS Laboratory, Donghong is at the forefront of digitalizing, informatizing, and making pipelines intelligent. This leadership in pipeline engineering drives the industry forward and supports critical national projects such as the South-to-North Water Diversion and the Beijing-New Zealand Expressway. With a focus on innovation and quality, Donghong is dedicated to serving key strategic and livelihood projects, ensuring a reliable and efficient pipeline infrastructure.

FAQ

 

1. Are your products compliant with international standards?

Our products have passed CE, BV, ISO, and Wars certificates, exceeding standard requirements. Feel free to specify any national standard you need, and we will ensure compliance through testing.


2. What services do you offer?

As a manufacturing factory, we provide pipe products, fittings, packaging, and shipping. Additionally, as a consultancy firm, we offer project advice, pipe system solutions, and design recommendations. We also provide pipeline contracting, repair services, and maintenance guidance.


3. Do you support OEM/ODM services?

Yes, we offer customization in materials, specifications, logos, packaging, and connection methods. Our expert team can provide tailored solutions for your projects, backed by successful case studies.


4. What are your payment terms?

We accept T/T or L/C at sight.


5. How do you ensure the quality of your products?

We welcome customers to visit our company and inspect our goods. Additionally, we conduct rigorous testing as per customer requirements before orders. Prior to bulk production, we provide samples for customers to conduct their own tests for product validation.