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Comprehensive Overview of Pipe Manufacturing Methods: CW, ERW, and Seamless

This document provides a detailed examination of various pipe manufacturing techniques, including Continuous Weld (CW), Electric Resistance Weld (ERW), and Seamless pipes. Each method is analyzed for its production process, applications, advantages, and disadvantages. CW is recognized for its economical and consistent seam but is facing challenges due to limited production and environmental regulations. ERW offers versatility in applications but has certain limitations on seam properties. Seamless pipes are highlighted for their superior quality yet come with higher costs.

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Comprehensive Overview of Pipe Manufacturing Methods: CW, ERW, and Seamless

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  1. Pipe Principles PREPARED FOR

  2. Pipe • Continuous Weld (CW) • “Hot” mill manufacturing method • Heated scalp is pulled through forming rolls and butted together forming a melted seam • Basic, all-around hot water, chilled water, drain, low-med pressure steam applications • Pros • Economical • Consistent seam, ideal for threading • Domestic • Uniform 10’/21’ lengths

  3. Pipe • Continuous Weld (CW) • Old-school, “Hot” mill manufacturing method • Heated scalp is pulled through forming rolls and butted together forming a melted seam • Basic, all-around hot water, chilled water, drain, low-med pressure steam applications • Cons • Scarcity • Only one firm continues to produce, due to EPA regulations and very high mill costs • Inferior bursting pressure • Unsuitable for roll grooving

  4. Pipe • Electric Resistance Weld Grade B(A53B ERW) • Basic, all-around 2-1/2” and larger pipe • Coils of steel are cold formed by rollers and arc-welded electrically, cold-style production • Seam is annealed via either blast furnace or chemically, to reduce martensite in weld • Pros • Wide-variety of applications • Ideal for all welding, grooving • Domestic and Import • Uniform 21’ lengths through 6” • MTR (birth cert) created for every length

  5. Pipe • Electric Resistance Weld Grade B(A53B ERW) • Basic, all-around 2-1/2” and larger pipe • Coils of steel are cold formed by rollers and arc-welded electrically, cold-style production • Seam is annealed via either blast furnace or chemically, to reduce martensite in weld • Cons • Seam is harder than that of CW • Inferior bursting pressure vs Seamless • *not per ANSI B31.1 • Limited to standard wall

  6. Pipe • Seamless(A106) • Superior to A53 and CW in all properties • A solid billet of steel is rotated while a mandrel shapes an interior hole in tube • Pros • Widest-variety of applications • Superior for all welding, grooving • Available in all wall thicknesses • MTR (birth cert) created for every length

  7. Pipe • Seamless(A106) • Superior to A53 and CW in all properties • A solid billet of steel is rotated while a mandrel shapes an interior hole in tube *Not necessarily superior to welded pipe • Cons • Price • Availability of domestic product • 17’-24’ lengths

  8. Conclusion PREPARED FOR

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