Pipe Principles

PREPARED FOR

April 22, 2023

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

Cons

•Scarcity• Only one firm continues to produce, due to EPA

regulations and very high mill costs•Inferior bursting pressure•Unsuitable for roll grooving

•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

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

Cons

•Price•Availability of domestic product•17’-24’ lengths

*Not necessarily superior to welded pipe

Conclusion

PREPARED FOR

April 22, 2023