Above Ground Pre-Insulated Steel Pipe


  • EN/DIN 253
  • EN 448
  • EN 489
  • ASTM D-1248

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 above-ground steel pipe is a type of fiberglass jacketed, spray-applied polyurethane foam insulated piping system for above ground for centralized district heating or 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.


HDPE Casing

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


Pipe Specifications

Size ERW/LSAW: Ф25-Ф630mm


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

WT: 26.9mm – 323.9mm (SCH10-SCH160)

Water volume (l/m): 0.4 – 9.0

Length: 6m/12m

Inner pipe Material 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

Coating Thickness The outer 2.0-4.0 mm, and the inner 0.35-0.5 mm


As one of the leading suppliers and manufacturers of coating carbon steel pipe in China, WLD steel supply and manufacture above ground 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. With the partnership of the major steel mills in China, comprehensive advanced coating measures are provided for your pipe needs.