Unisite Group Ltd.
Model No.: USA-248
Certificate: BV CCS
Dimension: As Per Drawing/order
Type: Butt Welded
Tolerance: High Accuracy(ISO2768, ISO5817), Within 1mm
Inspection: Material, Construction, Dimension, Welding Seam, N
Standard: AISI, ASTM, BS, DIN, GB, JIS
Surface Treatment: Painted
Outer Diameter: 500 - 2000 Mm
Material: Outer Casing Steel(S335J2G3,DH36,S690Q)+casting Li
Double Walled Pipe: Marine Double Walled Pipes
Packaging: bulk package and bulk vessel transportation
Place of Origin: china mainland(zhejiang)
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.
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
Outer casing butt welded with flanges, to form high-precision bending, abrasion resistant and long service life and can be used in Dredger.
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
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)
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
- Material certificates EN10204 3.1
- Inspection protocol
- NDT reports
- Fixed certificate: ISO9001, BV certificate, CCS certificate
Photos of our Marine double walled pipes
How to contact us?
Send your Inquiry Details in the Below, Click "Send" Now!