Welded Tube and Pipe Manufacturing Processes

Steel pipes are made by two different processes. The overall production method for both processes involves three steps.

First, raw steel is converted into a more workable form. Next, the pipe is formed on a continuous or semicontinuous production line. Finally, the pipe is cut and modified to meet the customer’s needs.

Ends of Pipes

For the ends of pipes are 3 standard versions available.

• Plain Ends (PE)
• Threaded Ends (TE)
• Beveled Ends (BE)

The PE pipes will generally be used for the smaller diameters pipe systems and in combination with Slip On flanges and Socket Weld fittings and flanges.

The TE implementation speaks for itself, this performance will generally used for small diameters pipe systems, and the connections will be made with threaded flanges and threaded fittings.

The BE implementation is applied to all diameters of buttweld flanges or buttweld fittings, and will be directly welded (with a small gap 3-4 mm) to each other or to the pipe.

Ends are mostly be beveled to angle 30° (+ 5° / -0°) with a root face of 1.6 mm (± 0.8 mm).

ERW Pipe Manufacturing Process

Our manufacturing process generally involves the following stages in a step by step procedure.

• Electric resistance welding at a glance
• ERW pipe technical requirements
• Pipe cutting, Pipe connection
• RHS/SHS manufacturing Process

LSAW Pipe Manufacturing Process

LSAW (Longitudinally Submerged Arc Welded Steel pipes) in leaflets plate as raw material, the steel plate in the mold or molding machine pressure (volume) into using double-sided submerged arc welding and flaring from production.

• The Process For LSAW Steel Pipe
• The technique process of LSAW steel pipe

UOE Pipe Manufacturing Process

UOE(Uing and Oing forming) is a method used for production of longitudinally welded large diameter pipes.

JCOE Pipe Manufacturing Process

The mill adopts continuous axis contorting J-C-O(J-ing, C-ing and O-ing)process with characteristics of high forming accuracy and efficiency as well as balanced distribution of forming stress.

SSAW Manufacturing Process

Spiral welded pipe production by submerged arc method is based on using tandem welding technique for joining inside and outside coil edges, which have been trimmed and beveled by carbide milling for high quality weld structure.

• Advantage of galvanized spiral pipe welding process
• Galvanized pipe process characteristics

Anti rust process

Finally emphasis on the importance of surface treatment in the production, strictly control the process parameters when anti rust.

• Anti layer structure
• Anti corrosion Pipe Coating Specs
• Anti-corrosion surface treatment process of spiral pipe

Length of Pipes

Piping lengths from the factory not exactly cut to length but are normally delivered as:

• Single random length has a length of around 5-7 meter
• Double random length has a length of around 11-13 meter
• Shorter and longer lengths are available, but for a calculation, it is wise, to use this standard lengths;
• other sizes are probably more expensive.

Packing:

• Packed in wooden crates, wrapped in plastic, and suitably protected for sea-worthly delivery or as requested.
• Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.

Delivery:

Pipes are supplied in hexagonal bundles or round bundles tied with steel strip.
Weight of bundle – up to 5000 kg upon request of customer.
Each bundle is furnished with three tags.