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Pipe Principles

Pipe Principles. PREPARED FOR. 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

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Pipe Principles

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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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