Large Size Welded Pipe

Out diameter usually from 323mm to 1420mm. When the outer diameter is above 914.4mm it's allowed two straight welded seams.

Usage: Long distance transportation for oil, gas, liquid, coal gas, etc. inshore and offshore, also used as construction pipes, offshore platform, power station, petrochemical and civil construction, etc.

Outer Diameter: 219mm-1820mm (8'' ~70'')

Wall Thickness: 5.0mm-50mm

Length: 5.8mtr-18mtr

End: square ends (straight cut, saw cut, and torch cut). or beveled for welding, beveled,

Surface: Lightly oiled, Black, Bare, Varnish coating/Anti rust oil, Protective Coatings

MATERIAL: CS, LTCS Q235, Q345, ASTM A25, API 5L GR.B, X42, X46, X52, X60, X70, etc.

STANDARD: API 5L, ASTM A252, ASTM A672, ISO3183, GB/T3091, GB/T9711, etc.

【Product Features】

High-strength Annular Structure
The large size welded pipe adopts an annular butt weld structure. By optimizing the circumferential stress distribution of the pipe body, the radial pressure bearing capacity of the welded pipe is increased by 30%. The pipe adopts a spiral reinforcement design in the longitudinal direction. In the specifications with a pipe diameter of more than 1.2 meters, the annular tensile strength can reach more than 550MPa, which is 25% higher than the traditional straight seam welded pipe, ensuring that it is not easy to deform under heavy load conditions.

High-toughness Alloy Steel Material
The large size welded pipe uses Q355B low-alloy high-strength steel as the base material, adding trace elements such as niobium (Nb) and vanadium (V) to stabilize the yield strength of the steel at more than 355MPa and the elongation reaches 22%. This material can still maintain an impact absorption energy of more than 27J at a low temperature of -20℃, which is 40% higher than the brittle fracture resistance of ordinary carbon steel.

【Product Application】

Oil And Gas Transportation Field
In the oil and gas transportation industry, large size welded pipe is mainly used to build long-distance transportation pipelines.

Urban Water Supply And Drainage Engineering
In urban water supply and drainage engineering, large size welded pipe plays the role of main water supply pipelines and drainage mains.

Bridge Construction Engineering
In the field of bridge construction, large size welded pipe is used to make bridge support structures and steel tube concrete components.

Large Building Structures
In large building structures, large size welded pipe is used as the main load-bearing component, such as columns and beams of steel structure buildings.

Marine Engineering Field
In marine engineering, large size welded pipe is used to build pile foundations and conductor frames for offshore platforms.

Thermal Transmission System
In the thermal transmission system, large size welded pipe is responsible for transporting high-temperature steam or hot water.

【Frequently Asked Questions】

What are the main production processes of large size welded pipe?
Common production processes of large size welded pipe include straight seam submerged arc welding (LSAW), spiral submerged arc welding (SSAW) and high frequency resistance welding (ERW).

What are the common materials of large size welded pipe?
Common materials of large size welded pipe include carbon structural steels such as Q235 and Q345, as well as X series pipeline steel.

What are the main application areas of large size welded pipe?
Large size welded pipe is widely used in oil and natural gas transportation, urban water supply and heating, bridge construction, marine engineering and other fields.

What are the methods for anti-corrosion treatment of large size welded pipe?
Common anti-corrosion methods of large size welded pipe include external coating anti-corrosion (such as polyethylene coating, epoxy coal tar coating), internal coating anti-corrosion (cement mortar lining) and cathodic protection.

What should be paid attention to during the transportation of large size welded pipe?
When transporting large size welded pipe, it is necessary to prevent the pipe body from collision and scratching, and use special brackets and fixing devices to avoid rolling and displacement.

What are the technical requirements for large size welded pipe during installation?
When installing large size welded pipe, it is necessary to ensure that the centerline deviation of the pipeline meets the specifications, and the welded joint must reach the design strength; pay attention to the pipeline slope and drainage to prevent medium accumulation; perform pressure test after installation to ensure sealing and safety.

What are the types of welded joints for large size welded pipe?
Common joints for large size welded pipe include butt joints, T-joints, corner joints, etc.

What are the maintenance measures for large size welded pipe?
Regularly check the integrity of the anti-corrosion layer of large size welded pipe and repair the damaged parts in time; monitor the pipeline pressure and flow to prevent abnormal operation; clean the impurities inside the pipeline to avoid corrosion and blockage; perform non-destructive testing on key parts to ensure safe operation.

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