Welded Duplex Large Steel Pipe

Usage: Used for low pressure liquid delivery, such as water, gas, and oil. General, Hydraulic System, Constructural, Decorative/Ornamentalssss

Process: 
TIG (DIN 17455; 17457) - tungsten inert gas welding, used for water piping, gas supply pipes and and pipes for the food industry
MIG - metal inert gas welding.
PAW – plasma arc welding.
ERW (Electric Resistance Welded)
HFI (High Frequency Induction)
EFW (Electric Fusion Welded Tube)
LSAW (Longitudinal Submerge-arc Welded)  UO(UOE),RB(RBE),JCO(JCOE)
DSAW (Double Submerged arc welded)
SAW (Spiral Welded)
SSAW (Spiral Submerged-arc Welded)

ERW HFI , EFW, LSAW, DSAW: 
GB/T3091 Welded steel pipe for low pressure liquid delivery
GB/T9711 Petroleum and natural gas industries--Steel pipe for pipelines

Application of Welded Duplex Large Steel Pipe, standards and regulations:

Size:
ERW Electric resistance welding, HFI, EFW:
Outer Diameter: 6mm-610mm (1/16"-24") 
Wall Thickness: 0.3mm-22mm 
Length: 0.5mtr-20mtr

LSAW, DSAW: 
Outer Diameter: 219mm-1820mm 
Wall Thickness: 5.0mm-50mm
Length: 6mtr-18mtr

SAW Submerged arc welding, SSAW:
Outer Diamter: 219.1mm - 4064mm (8" - 160") 
Wall Thickness: 3.2 mm - 40mm 
Length: 6mtr-18mtr

End: square ends (straight cut, saw cut, and torch cut). or beveled for welding, beveled, 

Surface: Lightly oiled, Hot dip galvanized, Electro galvanized, Black, Bare, Varnish coating/Anti rust oil, Protective Coatings (Coal Tar Epoxy,  Fusion Bond Epoxy, 3-layers PE)

Packing: Plastic plugs in both ends, Hexagonal bundles of max. 2,000kg with several steel strips, Two tags on each bundle, Wrapped in waterproof paper, PVC sleessve, and sackcloth with several steel strips, Plastic caps.

Test: Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield 
strength, Elongation), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test.
Mill Test Certificate: EN 10204/3.1B 
Third party inspection: SGS, BV, Lloyds etc.