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Spiral pipes are manufactured continuously from hot rolled steel coils & hence length of pipes can be maintained as per the customer’s requirement from 6 to 13 meters or more. However, fabricated pipes are 2 to 2.5 meters in length. Thus resulting into higher number of joints per kilometer of pipeline which results in higher lead time for laying the pipeline.
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Higher laying cost due to increased number of joints.
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Higher probability of leakages at joints.
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Higher maintenance cost.
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Dimensional accuracy i.e. Thickness Uniformity, Ovality, Straightness & diameter control is excellent in case of spiral pipes rather than manually bent & fabricated pipes at site.
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Spiral pipes has uniform round periphery as against peaks at weld joints in case of site fabricated pipes.
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Bursting pressure acts at a right angle to the axis of the pipe. Since, welds of spiral pipes are at an angle, these weld joints withstand higher bursting pressure as against longitudinal welds of the site fabricated pipes; hence spiral pipes can handle water hammer effect smoothly.
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Spiral SAW pipe shows better weld strength than the basic raw material as against site fabricated pipes.
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Spiral pipe manufacturing has automatic weld gap control arrangement; hence it gives better control of weld parameters & quality.
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In case of pipeline bursting due to material failure, the spiral weld seam acts as a crack propagation arrester.
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Delivery of spiral pipes is much faster than site fabricated pipes.
