DOUBLE JOINTING OF STEEL PIPES
TURNKEY SOLUTIONS FOR DJ
Solutions for double jointing
In a pipe-laying project, prefabrication of double pipes can be a good choice to speed up the progress of the pipe-laying and improve the quality of the weld seams at the same time.
Our prefabrication stations for double pipes are designed for the production of 2×6,000 mm and 2×12,000 mm pipes.
HAANE welding systems supplies DJ stations from a pipe diameter of 10″ for the submerged arc welding process inside and outside.
HAANE welding systems supplies complete DJ systems, consisting of
Mechanically or metallurgically clad pipes perfectly combine two properties: corrosion resistance and very good mechanical properties with a cost advantage over solid/pure CRA pipe materials.
In the case of mechanical LINED and metallurgical CLAD pipes, the circumferential weld on the double joint must have the same good anti-corrosion properties as the material inside the pipe.
Electroslag strip welding (ESW) is a good process to fulfill this task. It can be used for pipes up to 12″ in size and 2 x 12,000 mm in length. Typical strip widths are 15/20/30×0.5 mm and typical alloys type 625, 825, 316.
Deposition rates of 6 – 12 – 24 kg/hour can be achieved and often only one layer is sufficient to meet the requirements.
HAANE welding systems supplies the entire system required, consisting of:
- Height-adjustable inner rail
- Pipe trolley with pipe positioner
- Welding/cladding equipment
- Belt unwinding and feeding system, also from large containers
- Welding flux circulation system
- Welding control unit, including welding parameter setting and control, camera monitoring system, data documentation for each individual clad pipe with transfer to a higher-level MES plant management level
