Large Diameter Spiral Steel Pipe SSAW SAWH
What is the large diameter spiral steel pipe?
Large diameter spiral steel pipe generally refers to spiral steel pipe with diameter greater than 1 meter.
As a spiral steel pipe professional manufacturer, Cangzhou spiral steel pipe company produce best submerged arc welding large diameter spiral SSAW SAWH steel pipe range from 1000mm to 3500mm for the clients all over the world. The produced large diameter spiral steel pipes are in accordance with international standards including API 5L, ASTM, DNV, ISO, DIN, EN, BS, CE, CSA, etc. All these large diameter spiral steel pipes are used for long distance transmission of gas, oil, chemicals, water, liquid natural gas, steam, heat supply, offshore dredging, etc.
We are capable of producing all kinds of coating steel pipe including single/double layer fusion-bond epoxy (FBE), two layers polyethylene/polypropylene (2LPE/2LPP), three layers polyethylene/polypropylene (3LPE/3LPP), polyurethane, concrete weight coating (CWC), insulation and bitumen external coating steel pipe and liquid epoxy, FBE, bitumen and cement internal coating steel pipe as per international standards.
Technical Data
- Outside Diameter (OD): Φ1000mm – Φ3500mm
- Wall Thickness: 6.4 – 25.4mm (1/4″-1″)
- Applicable Standards: API, DNV, ISO, DEP, EN, ASTM, DIN, BS, JIS, GB, CSA, etc.
- Length: 6-130m
- Steel Grade: Q235A, Q235B, Q345B, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, Q345, L245, L290, X42, X46, X70, X80, etc.
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 sleeve, and sackcloth with several steel strips, Plastic caps.
Large-diameter spiral steel pipe is made by bending steel strip and then welding. Experiments such as water pressure, bending and flattening are required. Usually, the delivery length is 12m, and it can also be delivered according to the customer’s requirements.
Double-sided submerged arc welding technology is used in large diameter spiral steel pipe, which has the advantages of stable welding quality, high welding productivity, no arc light and little smoke.
- Forming process: front swing intermittent production;
- Unit speed: 0.5-3m/min;
- Welding speed: 0.5-3m/min.
The unit consists of uncoiler, straightener, centering device, hydraulic shears, milling and welding machine, disc shears, edge milling machine, panel cleaning equipment, delivery machine, edge pre-bending equipment, forming machine, internal welding, external welding, flash, pulling out, slag pouring, repair welding, flat chamfering, water pressure inspection, finished product inspection and oil removal collection.
Large diameter spiral steel pipe is mainly used in tap water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction and other occasions.
