Unisite Group Ltd.

Double Walled Pipe,Marine Double Walled Pipes,Steel Double Walled Pipes Size


Home > Products > Structural Pipes > Double Wall Pipe > Marine double walled pipes

Marine double walled pipes

Basic Info

Model No.: USA-248

Certificate: BV CCS

Dimension: As Per Drawing/order

Inspection: Material, Construction, Dimension, Welding Seam, N

Standard: AISI, ASTM, BS, DIN, GB, JIS

Surface Treatment: Painted

Type: Butt Welded

Tolerance: High Accuracy(ISO2768, ISO5817), Within 1mm

Outer Diameter: 500 - 2000 Mm

Material: Outer Casing Steel(S335J2G3,DH36,S690Q)+casting Li

Double Walled Pipe: Marine Double Walled Pipes

Additional Info

Packaging: bulk package and bulk vessel transportation

Brand: UniSite

Transportation: Ocean,Land

Place of Origin: china mainland(zhejiang)

Certificate: CCS/ISO/BV

Product Description

A double-walled pipe is a secondary contained piping system. It is a pipe within a pipe, or encased in an outer covering, with an annulus (interstitial space) between the two diameters. The inner pipe is the primary or carrier pipe and the outer pipe is called the secondary or containment pipe. The great majority of double-walled piping applications involve wastewater, groundwater, and process safety.Marine double walled pipes

Double Wall Dredge Pipe Benefits

All double wall dredge pipe pieces are custom made according to the customers' requirements

Double wall dredge pipe pieces are made of different thickness according to the wear pattern

Flanges are cast together with the pipe to provide a stronger connection

All double wall dredge pipe pieces are provided with lifting lugs

All double wall dredge pipes have smooth surface for low frictions Production

All double wall dredge pipe pieces is done at high quality and experienced foundry

The specifications of our Double Wall Pipe

A. General

Outer casing butt welded with flanges, to form high-precision bending, abrasion resistant and long service life and can be used in Dredger.

B. Construction

The construction is to be built according to the drawing with rules of good workmanship.

Outer casing lobster tail shape, CAF molding, assemble on the platform to ensure the dimensions.

High accuracy, in particular to ensure the angle, chord length, concentricity, and flanges.

Inner liner, casting with high demand. They are made of a wear resistant cast iron with

high hardness. The liners have been machined to tolerance of the liner drawing at both ends.


Outer casing produce-weld flange- flange surface machining- inspection (NDT+ dimension)-liner casting- assemble liner and outer casing- inspection- casting the cement-delivery

C. Materials

All fabricated steelwork used in the construction of the bend will be to manufacturing standard of UniSite or other classification society.

All materials proposed will be selected to comply with the latest Health and Safety Rules.

outer casing steel(S335J2G3,DH36,S690Q)+casting liner(like GX260)+ nonshrink cementitious grout

Paint systems for hull protection will be of the highest quality (Hempel, Inter, Sigma, Jotun)

D. Welding

All welding will be performed in accordance with drawing and order and UniSite experience and all welding will be continuous and full penetration.

E. Main particulars



Normal 10°,15°, 22.5°, 30°, 45°, 50°, 60°, 67.5°, 90°or others acc. to order or Straight Pipe


High accuracy(ISO2768, ISO5817), within 1mm


outer casing steel(S335J2G3, DH36,S690Q)+casting liner(like GX260)+ nonshrink cementitious grout


As per drawing/order




Sa2.5 blasted and two or three layers painted with highest quality


as per clients' requirements


material, construction, dimension, welding seam, non defective test, paint inspection


Recyclable, in line with environmental requirements and standards, and reliable

F. Certificates

- Material certificates EN10204 3.1

- Inspection protocol

- NDT reports

- Fixed certificate: ISO9001, BV certificate, CCS certificate

double wall pipe

double wall pipe

double wall pipe

Photos of our Marine double walled pipes

Double Walled Pipe Marine Double Walled Pipes price Marine Double Walled Pipes Steel Double Walled Pipes Size

How to contact us?

Send your Inquiry Details in the Below, Click "Send" Now!

Looking for ideal Double Walled Pipe Manufacturer & supplier ? We have a wide selection at great prices to help you get creative. All the Marine Double Walled Pipes are quality guaranteed. We are China Origin Factory of Steel Double Walled Pipes Size. If you have any question, please feel free to contact us.

Product Categories : Structural Pipes > Double Wall Pipe

Product Images

  • Marine double walled pipes
  • Marine double walled pipes
  • Marine double walled pipes
  • Marine double walled pipes
  • Marine double walled pipes
Email to this supplier
  • *Subject:
  • *Messages:
    Your message must be between 20-8000 characters