Galvanized Welded Rectangle Steel Pipe
Zinc coated welded rectangular section in lengths from 0.3 to 18 M
Specifications
Welded Pipe, Steel Pipe
Large Diameter SSAW Spiral Welded Steel Pipe
Spiral submerged arc welded pipe for large bore water lines piling and construction
SSAW pipe is spiral submerged arc welded steel pipe, formed by coiling strip into a helix and welding the spiral seam from both sides. Water authorities, piling contractors and civil EPC buyers specify it for low pressure transport of water, gas and oil and for construction and piping work where the bore is too large for a longitudinally welded body. Forming from coil rather than plate is what makes diameters up to 3048mm and joint lengths up to 70 M reachable without a plate mill of matching width. The spiral seam is X-ray checked and each length is hydrostatically tested before dispatch.
- Product Name — Spiral Submerged-Arc Welded Steel Pipe
- Manufacturing Method — Spiral submerged arc welding
- Standards — ASTM A252, EN10217-1, EN10217-2, EN10217-5, EN10219-1, BS, JIS, IS
- ASTM Grades — ASTM A252 GR 1, GR 2, GR 3
- BS Grades — BS 4360 Grade 43, Grade 50
Why It Is Specified
Key Benefits of Spiral Submerged-Arc Welded Steel Pipe
Diameter Range Beyond Longitudinal Welded Pipe
Outside diameter runs from 219.1 mm to 3048mm, which covers bores that no electric resistance welded mill can form. Trunk mains and large culverts come from one route.
Joint Lengths up to 70 M
Lengths from 3 to 70 M cut the number of field welds on a long run, which is where lay rate and inspection cost usually sit.
Spiral Seam Checked by X-ray
The submerged arc seam is examined by X-ray test alongside hydrostatic testing, so the weld along the helix is documented rather than assumed.
Piling and Pressure Grades from One Mill
ASTM A252 GR 1, GR 2 and GR 3 for piling sit next to the EN S275 and S355 pressure grades, so a project with foundation piles and water main can be filled together.
Coating Applied to the Route Conditions
Fusion bond epoxy, coal tar epoxy, 3PE, vanish, bitumen or black oil coating is applied to the customer requirement before the pipe reaches the site.
Wall Band Suited to Buried Service
Wall thickness from 4mm to 30mm lets a thin wall carry a gravity water line while a heavier wall takes the driving load on a pile.
Problems It Solves
What This Material Removes From Your Process
Bore Larger Than Any Longitudinal Mill Can Roll
Above the largest longitudinally welded bore a straight seam body is not available. Spiral forming from coil reaches 3048mm without waiting for plate of matching width.
Field Weld Count Driving the Programme
Every joint means a welder, an inspection and a coating repair. Lengths up to 70 M reduce the number of joints across the same route.
Piling and Pipeline Bought Separately
Foundation piles and water main are often split between suppliers. ASTM A252 piling grades and API 5L pressure grades are both covered here.
Spiral Seam Quality Taken on Trust
The helical seam is the natural concern with SSAW. X-ray testing, metallographic examination and a hydrostatic test put the result on the certificate.
Coating Arranged After Delivery
Coating a large diameter pipe on site is slow. The chosen system is applied as per customer requirement before loading.
Application Scenarios
Where It Is Used
Large Bore Water Transmission Mains
Trunk mains carrying water at low pressure where the required bore sits above what longitudinally welded pipe covers economically.
Foundation and Marine Piling
Driven pipe piles ordered to ASTM A252 GR 1, GR 2 and GR 3 for building foundations, jetties and bridge supports.
Gas and Oil Transfer Lines
Low pressure gas and oil runs certified to API 5L PSL1 or PSL2 where a spiral body is accepted for the duty.
Construction and Structural Piping
Columns, caissons and heavy structural tubes on civil works using BS 4360 Grade 43 and Grade 50 or EN S355 grades.
Culverts and Drainage Crossings
Large diameter drainage and culvert sections where lengths toward 70 M reduce the number of joints in the crossing.
Power Plant Circulating Water Lines
Cooling and circulating water runs at plant scale where diameters approach the 3048mm end of the range.
Who It Is For
Buyers Who Specify This Product
- Water authority engineers specifying large bore transmission mains
- Piling contractors buying pipe piles to ASTM A252 GR 1 GR 2 and GR 3
- Civil EPC buyers ordering large diameter pipe for culverts and crossings
- Pipeline project managers sourcing API 5L PSL1 or PSL2 spiral pipe
- Marine and jetty contractors buying driven tubular piles
- Power plant procurement teams ordering circulating water pipework
Technical Data
Specifications and Technical Features
Values below come from the product data published by Shandong Tianyu Metal Products. Confirm the exact grade and size against your order.
| Product Name | Spiral Submerged-Arc Welded Steel Pipe |
|---|---|
| Manufacturing Method | Spiral submerged arc welding |
| Standards | ASTM A252, EN10217-1, EN10217-2, EN10217-5, EN10219-1, BS, JIS, IS |
| ASTM Grades | ASTM A252 GR 1, GR 2, GR 3 |
| BS Grades | BS 4360 Grade 43, Grade 50 |
| EN Grades | S275JR, S275J0H, S275J2H, S355JRH, S355J0H, S355J2H |
| Outside Diameter | 219.1 mm to 3048mm |
| Wall Thickness | 4mm to 30mm |
| Length | 3 to 70 M |
| Surface Treatment | Fusion bond epoxy coating, coal tar epoxy, 3PE, vanish coating, bitumen coating, black oil coating as per customer requirement |
| Certificate | EN10217, EN10219, API 5L PSL1/PSL2, API 5CT |
| Tests | Chemical component analysis, tensile, yield, elongation, metallographic test, bending, Charpy-V impact, X-ray, hydrostatic |
| Place of Origin | China |
Technical Features
- Spiral submerged arc welded body formed from coil
- Outside diameter 219.1 mm to 3048mm
- Wall thickness 4mm to 30mm
- Length 3 to 70 M
- Standards ASTM A252, EN10217-1, EN10217-2, EN10217-5, EN10219-1, BS, JIS and IS
- Grades ASTM A252 GR 1, GR 2 and GR 3, BS 4360 Grade 43 and Grade 50
- EN grades S275JR, S275J0H, S275J2H, S355JRH, S355J0H and S355J2H
- Certificates EN10217, EN10219, API 5L PSL1 and PSL2 and API 5CT
Materials
- Hot rolled coil in ASTM A252 GR 1, GR 2 and GR 3
- BS 4360 Grade 43 and Grade 50
- EN grades S275JR, S275J0H and S275J2H
- EN grades S355JRH, S355J0H and S355J2H
- Coating materials including epoxy, 3PE and bitumen systems
Certification
- ISO9001
- BV
- SGS
- RoHS
- API 5L PSL1 and PSL2
- API 5CT
- EN10217 and EN10219
Manufacturing
How It Is Made and Processed
Coil uncoiling, leveling and edge milling
Helical forming of the strip to the ordered diameter
Submerged arc welding of the spiral seam from inside and outside
X-ray examination of the seam
Hydrostatic testing of the finished length
End facing and beveling for field welding
External coating to the ordered system
Marking, stacking and loading for export
Quality Control
Checks Before It Ships
- Chemical component analysis of the coil against the ordered grade
- Tensile strength, yield strength and elongation testing
- Metallographic examination of the welded seam
- Bending and Charpy-V impact testing
- X-ray test of the spiral weld
- Hydrostatic test on the finished pipe before coating release
Customization
What We Can Change on Your Order
- Diameter selected between 219.1 mm and 3048mm for the hydraulic or pile design
- Wall thickness set between 4mm and 30mm against pressure or driving load
- Joint length from 3 to 70 M to suit the lay method and transport route
- Coating chosen from epoxy, 3PE, bitumen or black oil systems
- Grade selected from the ASTM A252, BS 4360 or EN lists
- End preparation and beveling for the field welding procedure
Comparison
Spiral Submerged-Arc Welded Steel Pipe Against the Alternatives
| ERW longitudinally welded pipe | Spiral forming reaches 3048mm outside diameter where the longitudinal route runs out of bore, and joint lengths run to 70 M. |
|---|---|
| Longitudinal submerged arc welded pipe from plate | Spiral pipe is formed from coil, so diameter is not limited by the width of plate a mill can roll. |
| Reinforced concrete pipe | A steel body can be welded joint to joint into a continuous line and takes driving load when the same section is used as a pile. |
| H section piles | A tubular pile gives the same section modulus in every direction and can be filled with concrete after driving. |
Use Guide
Specifying Handling and Welding Notes
- Fix the required bore first because diameter drives the whole cost on a line between 219.1 mm and 3048mm
- Choose wall thickness from the 4mm to 30mm band against internal pressure for a main and against driving energy for a pile
- Check the transport route and lifting capacity before ordering toward the 70 M length limit
- Specify the end preparation you want so field welding starts without re beveling on site
- Support large diameter pipe on shaped cradles during storage so the section stays round
- Ask for the X-ray and hydrostatic records with the certificate so the seam evidence is on file
Questions Buyers Ask
Spiral Submerged-Arc Welded Steel Pipe FAQ
How large a diameter can you make in spiral pipe?
Outside diameter runs from 219.1 mm up to 3048mm. Confirm the bore and the design pressure and we will come back with the wall thickness.
What length can a single joint be?
Joint length runs from 3 to 70 M. Longer joints cut the number of field welds but check your transport and lifting limits first.
Is the spiral seam X-ray tested?
Yes. X-ray testing is carried out on the seam along with a metallographic test, bending, Charpy-V impact and a hydrostatic test.
Can you supply pipe piles to ASTM A252?
ASTM A252 GR 1, GR 2 and GR 3 are all listed for this pipe. Tell us the pile diameter, wall and driven length required.
Do you have API 5L certification for this pipe?
Certificates cover API 5L PSL1 and PSL2 as well as API 5CT, EN10217 and EN10219. State which one the project specification calls for.
What coatings are available on large diameter pipe?
Fusion bond epoxy, coal tar epoxy, 3PE, vanish coating, bitumen coating and black oil coating are applied as per customer requirement.
How is pipe this size shipped?
Pipe is marked and stacked for loading with the joint length agreed against the vessel and the discharge port. Send the port details and we will plan the stow.
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