Steel plate coil pipe, which is rolled and welded from steel plates, is divided into two types of straight seam coil welded steel pipe and spiral seam coil welded steel pipe.
LSAW steel pipe: most of the construction site manufacturing or commissioned processing plant manufacturing, professional steel pipe factory does not produce. Steel plate material Q235A, No. 10, No. 20, 16Mn, 20g, etc., its specifications range from 200 to 3000mm nominal diameter, the largest with 4000mm, wall thickness generally 4 to 16mm. 200 to 900mm nominal diameter of a single tube length of 6.4m; nominal diameter of 1000 to 3000mm for 4.8m. applicable working temperature. Q235A for -15 ~ 300 ℃, No. 10, 20, 16Mn, 20g for -40 ~ 450 ℃, are suitable for low pressure range.
Spiral seam welded steel pipe: produced by the steel pipe manufacturing plant, material Q235A, 16Mn. its specifications range from 200 to 700mm nominal diameter, wall thickness 7 to 10mm, single pipe length 8 to 18m. applicable working temperature: Q235A for -15 to 300 ℃, 16Mn for -40 to 450 ℃, operating pressure: Q235A for 2.5MPa, 16Mn for 4MPa.
Longitudinal roll welded steel pipe and spiral roll welded steel pipe are mostly used for conveying low pressure corrosive medium at room temperature, such as low pressure steam, underground circulating water, gas and oil and gas, etc. Spiral roll-welded steel pipes are longer single pipes and are particularly suitable for long distance transport pipelines.
Dear air separation small air separation units, large air separation units and liquid air separation plants manufacturing pipeline independent production, strict implementation of process specifications requirements, a variety of steel pipe welding can be applied to high-quality small air separation units, large air separation units and liquid air separation plants.
