Welded Seam Piling Pipe
Welded Seam Piling Pipe Product Introduction. Welded seam piling pipe contains ERW pipe pile, LSAW pipe pile and Spiral weld pipe piling (SSAW). Specification: Description: Electric Resistance Weld Pipe (ERW) is normally produced in sizes from 2 3/8 inch OD to 24...Send Inquiry
Welded seam piling pipe contains ERW pipe pile, LSAW pipe pile and Spiralweld pipe piling (SSAW).
Minimum Yield Strength ReH
API 5L, PSL1
Minimum Yield Strength ReH
PSL: Product specification level , T: Thickness, Depends on tensile test piece cross-sectional area
Electric Resistance Weld pipe is normally produced in sizes from 2 3/8 inch OD to 24 inch OD.
ERW is produced from individual sheets or continuously from rolls of skelp. There are two important differences in the production of ERW pipe as versus CW pipe. ERW pipe is cold formed into a cylindrical shape rather than hot formed. An electric current rather than a flame is used to heat the edges of the strip for the fusion weld. Revolving copper discs serve as electrodes and raise the temperature to about 2600°F for effective welding. As in CW pipe, no extraneous metal is added; in fact, due to the extreme pressure of the rolls, steel is extruded on both the inside and outside of the pipe at the point of the weld. This is called flash and is removed on the O.D. by stationary cutters while still white-hot for A252 grades, and both the I.D. and O.D. for other grades. As in CW production, ERW pipe is subject to numerous finishing operations. ERW pipe is primarily used as API Line pipe for the transmission of gas and oil. It is also used for the transmission of water, under AWWA specifications, as piling and slurry pipe and in mechanical applications.
LSAW 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 nugget.
LSAW pipe is produced in sizes from 18" through 66" OD and wall thicknesses from 0.25" through 2". Two different processes are used to manufacture LSAW pipe; the pyramid rolls method, and the U-0-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-0-E method uses a "U" press, and "O" 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 may or may not be cold expanded. Cold expansion is a process where the pipe is expanded (up to 1.5%) to obtain its final OD 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 "O" press.
LSAW pipe is normally produced in double random lengths with square ends or beveled for welding.
DSAW pipe is used in high-pressure gas and oil transmission lines (both onshore and offshore), structural members and pipe piles.
Spiral Weld Pipe, as the name implies, is a steel pipe that has a seam running its entire length in a spiral form.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 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.
Edit by Mr. Will Fan of KRM/BSW
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