Pipe Principles PREPARED FOR November 22, 2018

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

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

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

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

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

Pipe *Not necessarily superior to welded 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

Conclusion PREPARED FOR November 22, 2018