Steel Pipe Fittings

Direct Burial Pre-insulated Reducing Nipple

Direct Burial Pre-insulated Reducing Nipple
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Product Details

The Direct burial pre-insulated reducing nipple 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 pipe tees 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 

DN1 – Nominal diameter: 20-400mm

DN2 – Reduced nominal diameter:20-350mm

d1 – Steel pipe outside diameter: 26.0-406.4mm

d2 – Reduced steel pipe outside diameter:26.0-355.6 mm

D1 – Casing PE pipe outside diameter: 90-560mm

D2 - Reduced casing PE pipe outside diameter: 90-500mm


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)


Protective pipe:

HDPE Casing pipe/ Fiberglass pipe

We supply and manufacture direct burial pre-insulated reducing nipple 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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