Spiral steel pipe (SSAW) is a spiral seam steel pipe made of strip steel coil as raw material, extruded at regular temperature, and welded by automatic double-wire double-sided submerged arc welding process.

There are three kinds of steel pipes commonly used in long-distance pipelines

The high-temperature prefabricated direct-buried thermal insulation pipe is a direct-buried prefabricated thermal insulation pipe with good thermal insulation performance, safety and reliability, and low engineering cost. It effectively solves the problems of thermal insulation, sliding lubrication and waterproofing of exposed pipe ends for prefabricated direct-buried thermal insulation pipes for 130°C-600°C high-temperature heat transfer in urban central heating.

The basic principle of forming adjustment of welded pipe

The drainpipe generally adopts spiral steel pipe (SSAW pipe), and the welding method of the spiral steel pipe is submerged arc welding. Since the welded steel pipe is spiral, the received liquid pressure will be distributed on each side of the steel pipe to increase the strength of the spiral steel pipe.

The base material of 3pe anti-corrosion steel pipe includes seamless steel pipe, spiral steel pipe and straight seam steel pipe. The three-layer polyethylene (3PE) anti-corrosion coating has been widely used in the oil pipeline industry due to its good corrosion resistance, water vapor resistance and mechanical properties.