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DM_20250915102256_001
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DM_20250915102256_001

Directly buried insulation pipe

Our company strictly supplies according to relevant domestic and international standards and owner requirements, with multiple production bases to ensure the construction period.

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Polyurethane pre-insulated direct-buried insulation pipe is closely combined with the steel pipe (or PE pipe) for conveying medium, polyurethane rigid foam insulation layer, and high-density polyethylene outer casing. It is mainly used for thermal insulation projects for conveying fluid media. This product is mainly used in urban central heating pipe networks, chemical and petroleum transportation pipelines, water pipelines in extremely cold areas, industrial pipeline engineering in factory areas, and central air conditioning supply and return water. It has characteristics such as efficient insulation, waterproof and anti-corrosion, simple construction, and low heat loss, with a service life of up to 30 years or more.

Implementation standards
Inner pipe material   Seamless steel pipe, spiral welded pipe, PE pipe, etc.
Design pressure   P≤1.6MPa
Conveying medium   Hot water, cold water, air conditioning supply and return water, etc.
Design temperature    T≤140℃
Standards    EN253、GB/T29047-2021
Polyurethane density    ≥60kg/m3
Service life    Greater than or equal to 30 years
Outer casing density    ＞940 kg/m3 and ≤960 kg/m3

Product advantages

(1) It is closely combined into a trinity by the inner working steel pipe, rigid polyurethane foam insulation layer, and high-density polyethylene outer protective pipe.

(2) Good insulation performance, low heat loss, long-term operation can save a lot of energy, and the effect of energy saving and emission reduction is significant.

(3) The company has production bases in Hebei, Inner Mongolia, Tianjin, and Liaoning, with complete production facilities and quality assurance systems.

(4) Strictly supply according to relevant domestic and foreign standards and owner requirements, with an annual supply of insulation pipelines reaching 5000km.

(5) Long-term cooperation with nearly a hundred logistics companies to ensure timely and effective transportation of insulation pipes to the project site, ensuring the construction period.

(6) Optional installation of warning lines, equipped with an alarm system to promptly detect pipeline network operation problems, improving the safety and stability of pipeline network operation.

(7) Equipped with a production line for electric fusion sleeves for joint repair, using the same batch of raw materials as the finished pipes, ensuring a high degree of fusion between the finished pipes and joint repair materials.

(8) Adopt direct burial method for laying, no need for additional pipe trenches, convenient and fast construction, effectively reducing the overall project cost, with a normal operation service life of up to 30 years or more.

 

Product specifications
Steel pipe

outer diameter
（φ,mm）

 Steel pipe

wall thickness
(mm)

 Outer casing

outer diameter
(φ,mm)

 Outer casing

wall thickness
（mm）

 Insulation layer

thickness
（mm）

 Single meter weight

of insulation pipe
（kg）
32 3 100 2.2 31.8 3.2
42 3 110 2.5 31.5 4.2
48 3 120 2.5 33.5 4.8
57 3.5 125 3 31 6.3
76 4 140 3 29 9.0
89 4 160 3 32.5 10.6
108 4 180 3 33 12.8
133 4 200 3.2 30.3 15.6
133 4.5 225 3.5 42.5 18.1
159 4.5 225 3.5 29.5 21
159 4.5 250 3.9 41.6 22
219 6 315 4.9 43.1 38
273 6 365 5.6 40.4 49
325 7 420 7 40.5 67
377 7 500 7.8 53.7 81
377 8 500 7.8 53.7 90
426 7 525 8 41.5 90
426 8 550 8.8 53.2 103
478 7 580 8.8 42.2 102
478 8 600 8.8 52.2 116
529 7 630 9.8 40.7 115
529 8 655 9.8 53.2 130
630 8 760 11.1 53.9 158
630 9 760 11.5 53.5 173
720 8 850 12 53 182
720 9 850 12 53 199
820 9 960 13 57 230
820 10 960 14 56 253
920 10 1055 14 53.5 283
920 12 1055 14 53.5 328
1020 10 1155 14 53.5 314
1020 12 1155 14 53.5 363
1120 12 1256 14 54 398
1220 12 1370 16 59 444
1220 12 1380 16 64 447
1220 14 1370 16 59 503
1220 14 1380 16 64 506
1420 14 1580 16 64 588
1420 14 1600 18 72 602
1420 16 1580 16 64 656
1420 16 1600 18 72 670
1620 14 1780 16 64 670
1620 16 1800 18 72 764

● Custom production can be carried out according to user requirements; optional leakage warning system, automatic detection of pipeline network leakage faults, automatic alarm, high safety and stability.

● The design and calculation of product specifications need to consider specific application conditions, involving many parameters, please contact Yuanfeng Company.

Product aliases: polyurethane foam insulation pipe, polyethylene insulation pipe, pre-fabricated buried insulation pipe, insulation pipeline, insulation steel pipe, hot water insulation pipe, plastic-coated steel insulation pipe, heating pipeline, black jacket insulation pipe, buried insulation pipe, thermal pipe network, etc.

Shipment pictures

Product List

Contact Us

  • Hebei Yuanfeng Pipeline Engineering Co., Ltd.
    • +86 4000-789-889 service@cnyufe.com
  • Building 34, Wanhe Mingzhu, Luquan District, Shijiazhuang City, 1-501.

    • Request Inquery

    Hebei Yuanfeng Pipeline Engineering Co., Ltd. was established in 2013 with a registered capital of 22.18 million yuan. It is a comprehensive R&D service enterprise focused on the production of steel jacketed steel direct-buried steam pipes, polyurethane direct-buried insulation pipes, spray-wound insulation pipes, galvanised iron overhead insulation pipes, PERT-II type insulation pipes, insulation pipe fittings, and joint installation. The company has strong production capabilities. Currently, it owns five production lines for polyurethane spray polyethylene wound prefabricated direct-buried insulation pipes, with an annual production of over 3,000 km of DN500mm-DN1600mm polyurethane spray polyethylene wound prefabricated direct-buried insulation pipes; 20 automatic winding machines for steel jacketed steel direct-buried steam insulation pipes, 8 sets of fully automatic pipe threading machines, 3 CNC intersecting line cutting machines, 2 pipeline fitting welding machines, 2 CNC plasma cutting machines, 10 external clamp cutting beveling machines, and 12 argon arc welders. It has 10 high-density polyethylene outer protective pipe production lines, with extrusion diameters reaching φ2000mm. The outer protective pipe production lines adopt advanced processes such as single-screw extrusion, vacuum sizing, corona treatment, spray cooling, and automatic cutting, capable of producing 30,000 tonnes of various types of high-density polyethylene outer protective pipes each year with diameters ranging from φ90-φ2000mm; 6 polyurethane prefabricated direct-buried insulation pipe production lines, 3 PU600 high-pressure foaming machines, capable of producing 5,000 km of DN20~DN1600mm insulation pipes; and 3 prefabricated overhead type polyurethane insulation pipe production lines, with an annual production of 2,000 km of DN25-DN1400mm prefabricated overhead type polyurethane insulation pipes. The company has production bases in Hebei, Inner Mongolia, Tianjin, and Liaoning, covering a total area of over 500 acres. The company's products cover China and more than 20 other countries and regions, including Mongolia, Russia, the Middle East, and South Africa. The products are mainly used for high-temperature steam transportation, central heating, and central cooling. Relying on advanced production technology, complete supporting equipment, and supply service systems, the company provides high-standard pipeline products to a wide range of customers, ensuring the safe operation of long-distance pipeline networks.

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    Contact Us

  • Hebei Yuanfeng Pipeline Engineering Co., Ltd.
    • +86 4000-789-889 service@cnyufe.com
  • Building 34, Wanhe Mingzhu, Luquan District, Shijiazhuang City, 1-501.

    • Copyright © 2025 Yuanfeng All Rights Reserved.

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    Request Inquery