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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
Manhattan Trading L.L.C