ERW STEEL PIPES
ERW pipes are extensively used in agriculture, industry and construction activities like scaffolding and casing and borewells. They are used for conveying water, gas, crude oil and chemicals at various pressures and densities over long distances. Considering the challenging and varied applications, the pipes are produced to meet very high standards of specifications both national and international including that of API (American Petroleum Institute).
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Product Specification
15mm NB (1/2 inch) to 400 NB (16 inch) Diameter Galvanised and Black Pipes
for Oil, Gas, Water and Slung transportation,
conforming to American Petroleum Institute (API) and other international
specifications including Impact testing and Ultra Sonic Testing.
Manufacturing
Process
ERW pipes are produced from Hot rolled slitted strip by way of progressive
forming through rollers/forming die flat to open seam round. Than this
open seam pipe is welded using high frequency induction/resistance welding
technology in auto mode. The process utilizes the latest technology in
auto mode. The process also utilizes the latest technology and modern
equipment for producing high quality ERW pipes.
Sequences details as given below:
| SLITTING | To predetermined widths | |
| FORMING | Forming into U shape and then into a cylindrical shape with open edges using a series of forming rolls. | |
| WELDING | Welding by heating to forging temperature through high frequency low voltage high current and press welded by forge rolls making perfect and strong butt without filler materials. | |
| DEBEADING | Debeading weld flash on top and inside (if needed) through carbide tools. | |
| SEAM ANNEALING | Welding poriton and heat affected zone with medium frequency normaliser and then cooled down in air cooling bed. | |
| SIZING | To desired round circumference as per specifications. | |
| CUTTING | Cutting to desired lengths by flying cut off disc/saw cutter. | |
| FACING AND BEVELLING | Edge preparation. |
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