Pre-insulated Pipe

Direct Burial Pre-insulated Steel Pipe

Direct Burial Pre-insulated Steel Pipe
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Product Details

The pre-insulated steel pipe is composed of carrier steel pipe, HDPE Casing pipe and jacketed foaming, which is used for insulation and cooling of indoor and outdoor pipelines, central heating pipelines, central air conditioning pipelines, chemical industry, medicine and long-distance transportation pipelines of petroleum. The directed burial pre-insulated steel pipe is a type of fiberglass jacketed, spray applied polyurethane foam insulated piping system for below ground distribution of liquids from -320°F to 250°F.  The polyurethane system with foaming provides maximum thermal efficiency to optimum performance of cryogenic and very low heat conductivity coefficient.



Standards: ASTM D-1248

ERW/LSAW: Ф25-Ф630mm,length: 6m or as customer's requirement.

SSAW:Ф219mm-Ф3620mm, length:12m or as customer's requirement.

SMLS : 10.3-1020mm * 2mm-40mm(1/4”- 40”)

WT: 1.24mm - 60mm (SCH10-SCH160)

Water volume (l/m): 0.4 - 496.9

Minimum wall thickness of the PE pipe: 3- 15.6mm



Carrier pipe (Inner pipe) can be:

API 5L Gr. B X42 X46 X52 X56 X60.

ASTM A106/53 Gr. A /Gr. B / Gr. C

APL 5CT:J55, K55, N80, L80, C90, T95, P110

DIN 1629: St 37.0, St 44.0, St 52.0

DIN 17175: St35.8, St45.8, 17Mn4, 17Mn5, 15Mn5, 15Mo3, 13CrMo910

EN10240: S235JO, S235JR, S355JR, P265TR1, S355JRH...

EN 10216-2/ EN 10217-2/ EN 10217-5: P235GH

EN 10217-1: P235TR1/TR2

(Other material manufactured by Customer’s Demand)


HDPE Casing pipe can be:

Outside casing pipe is manufactured from high-density Polyurethane with added antioxidants, UV stabilizers and carbon black. Internal surface of PE pipes is processed with Corona treatment in order to achieve better adhesion with PUR foam.


We supply and manufacture direct burial pre-insulated steel pipe in accordance with EN, ASTM, JIS, GB standards, specified delivery conditions and final customer specifications for companies in the machinery, construction, chemical, mining, food, railway and communications, energy and petrochemical, shipbuilding, pharmaceutical, aerospace, plastics and other industries. Special sizes of steel pipes and delivery issues can be further negotiated and we provide a wide range of solutions for purchasing departments to select alternative grades without specifying product specifications.

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