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Spiral Submerged- Arc Welded Steel Pipe


Usage: Used for low pressure liquid delivery, such as water, gas, and oil; construction and piling Standard: API 5L, API 5CT, ASTM A252, ASTM 53, EN10217, EN10219, BS 5950, ASTM A572 , JIS, IS, Certificate: EN10217, EN10219, API 5L PSL1/ PSL2, API 5CT Out Diameter: 219.1mm –3048mm Wall Thickness: 5.0mm-30mm Length: Up to 70m Steel Grade: API 5L: GR A, GR B, X42,X46, X56, X60,X65,X70 , ASTM A252 GR 1, GR 2, GR 3 , ASTM A53: GR A, GR B, GR C, GR D , BS 4360: Grade 43, Grade 50 , EN: S275, S275JR, S355JRH, S355J2H Surface: Fusion bond Epoxy coating, Coal Tar Epoxy, 3PE, Vanish Coating, Bitumen Coating, Black Oil coating as per customer’s requirement 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.

Manufacturing Process:

1. Coil Probe: steel coil into the production line, the first full board Ultrasonic Inspection 2. Leveling Milling: through anvil plate leveling machine so that the original curl, and then pass the two edges of steel-sided milling machine milling, so that up to the requirements of the plate width, plate edge parallel groove shape 3. Cut Type: steel production line along the outer edge of the coiled-coil tube 4. welding and cutting: the use of advanced technology for pre double submerged arc welding cutting inside from the foot of the welding specification welded steel pipe welded outside use, etc. 5. Visual inspection: some basic parameters by a professional technician check 6. ultrasonic flaw: the inner and outer sides of the base metal and weld seam 100% inspection 7. X-ray detection: internal and external welds 100% X-ray television industry checks, the use of image processing system ensures detection sensitivity 8. Pressure test: hydrostatic testing machine by-root test steel pipe up to the standard requirements to ensure that the test pressure 9. Chamfer level: steel pipe inspection pipe end processing, up to the requirements of the pipe end beveling size 10. Check: X-rays and then subjected to ultrasonic testing and magnetic particle inspection conducted pipe end, check whether the deposit welding problems and defects in the pipe ends. 11. Oiled Marking: Qualified oiled steel pipe corrosion and in accordance with user requirements for marking.


Double submerged arc welded pipe (DSAW) derives its name from the welding process wherein the welding arc is submerged in flux while the welding takes place. Both inside and outside welds are required and are usually accomplished in separate processes, hence the word "double." These separate welds consume a portion of the other resulting in a single high quality weld DSAW pipe is produced in sizes from 18" through 72" 00 and wall thicknesses from .250" through 1.5". Two different processes are used to manufacture DSAW pipe; the pyramid rolls method, and the U-O-E method. The difference in the processes is found only in the method of forming the cylinder. In the pyramid rolls process the cylinder is formed between 3 rolls arranged in a pyramidal fashion. As the name implies; the U-O-E method uses a "U" press, and "0" press for forming. Other parts of the process such as finishing and inspection are similar. Both processes use flat steel plate as the raw material. DSAW pipe mayor may not be cold expanded. Cold expansion is a process where the pipe is expanded (up to 1_5%) to obtain its final 00 dimension. In the process, a gain of yield strength results. Expansion is most often utilized in a U-O-E mill due to the need to recover the yield strength lost during forming in the "0 press, DSAW pipe is available in the following grades: ASTM A134, A139, A252, A671, A672, A690, A691, CSA (Canadian) - Z245.1 and custom specifications. API 2B, 5LB, 5LX-42 thru 5LX-80 DSAW pipe is normally produced in double random lengths with square ends or beveled for welding. It is usually furnished bare but varnish is also offered. A wide range of external coatings and internal linings are available with DSAW pipe. These include fushion bond epoxy (FBE) coatings and thin film epoxy linings. DSAW pipe is used in high pressure gas and oil transmission lines (both onshore and offshore), structural members and pipe piles. Major purchasers include liquid and gas transmission companies, hammer companies, construction contractors, platform fabricators, government agencies and pipe distributors.


Spiral Weld Pipe, as the name implies, is a steel pipe which has a seam running its entire length in a spiral form. In the past, due to the method of manufacture, Spiral Welded pipe was relegated to low pressure and structural applications. With the development of the Submerged Arc Welding process, the production of large hot rolled coils of sufficient width and the development of dependable non-destructive testing methods, it is now possible to produce Spiral Weld pipe for high pressure service. Present Spiral Weld mills consist of a de-coiling device (in the case of strip base material) or a plate preparation table (where the base material is in plate form) a strip connecting welder, straightening rollers, edge preparation tools (shearing and trimming), prebending devices, a three roller bending and cage forming system, an internal welder, an external welder (both Submerged Arc), ultrasonic testing apparatus and cutting devices. The material passes through all these production stages continuously. The angle between the flat strip being I fed into the machine and the finished pipe leaving the machine controls the pipe diameter in ratio to strip width and the angle of the weld in the pipe. Because of the method of manufacture, a wide variety of diameters can be produced. The diameter tolerance is small, particularly with regard to ovality; and the pipe, due to its axial symmetry, has an inherent straightness. The length range is infinite and is controlled only by the economics of transportation. Spiral Weld Pipe is used for dredging, slurry, water and other pipelines, as well as piling and structural applications. Spiral Weld Pipe is produced in accordance with the dimensional and tolerance requirements of various ASTM, AWWA, and API Specifications.
SSAW Steel Pipe
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