Digital Welding Systems, Inc.
Digital Welding Systems offers a wide range of orbital welding and pipe cutting tools, supplies and services.
http://www.orbitalwelding.com

Capitol Welders Supply
Welding positioners, pipe rolls, pipe cutting equipment,welding equipment, manipulators, and welding supplies.
http://www.capitolwelders.com

Bise Welding & Fabricating, Inc.
Bise Welding fabricates steel pipe, rolled cylinders and mitered fittings to ASME specifications. Specializes in the fabrication of Large OD Steel Pipe for waterworks and other projects. Provides precision welding services as well as fabrication of rolled and welded used steel pipe, large OD pipe, vertical casings, and mitered fittings.
http://www.bisewelding.com/

Marks Brothers, Inc.
Fabricator of welded ASME pressure vessels, half-pipe coils, dimpled jackets, pipe coils, jacketed vessels. Welding includes MIG, TIG, SAW and machine orbital welding.
http://marks-brothers.com

ProfilePipe Machinery Inc.
Company specializing in corrugated pipe machinery in North America
http://www.profilepipe.com

Adescor Inc.
Manufacture downstream equipment for the plastic pipe extrusion industry specializing in corrugated pipe extrusion machinery. Spin welding machines, pipe cutoffs and fabricated fittings machinery.
http://www.adescor.com

Rinker Materials Corporation.
Rinker Group
http://www.rinkermaterials.com/ProdsServices/ConcretePipe/default.shtml

Perma-Pipe, Inc.
Manufactures pre-insulated pipe and double containment pipe for the oil and gas industry. Also offer leak detection and location, heat traced cathodic protection systems and pipe inspection services.
http://www.permapipe.com/

Clow Water Systems Pipe and Fittings
Clow Water Systems Company has been one of the United States premiere manufacturers of iron pipe and fittings in the waterworks industry.
http://www.clowwatersystems.com

LKL Industrikonsult AB
Wdoc, a new advanced software product. It is designed for piping Contractors and other companies engaged with pipe welding. Main field of application is welding documentation,NDE follow-up and material traceability throughout projects.
http://www.inducon.nu