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