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HELICAL TWO STEP TECHNOLOGY
PIPE MANUFACTURING |
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Large diameter
API Grade pipes with a diameter range of 457 mm to 1524
mm, wall thickness upto 25 mm, length upto 18 meter
and upto and including API 5L X – 80 are manufactured
at Helical Two Step Pipe mill, Varsana 2. Annual plant
capacity is around 3,00,000 MT depending upon order
mix. |
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Helical
Two Step Technology Pipe mill consisting of the following
steps |
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First
Step : Pipe Formation Unit : |
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| Coil
opening operation.
Coil flattening operation.
Welding coil to coil butt ends for continuity.
Pipe forming operation.
Continuous tack welding of the formed
pipe.
Pipe end cutting operation. |
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Second
Step : Final Welding |
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Pipe is then discharged
to “Final Welding Station”. Final Welding
Station has 3 numbers Welding lines.
Following operation are undertaken here. |
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Continuous
internal welding.
Continuous external welding.
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The duly welded
pipe is discharged from the welding line for processing
of the pipe ends. |
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| End
beveling station.
Hydro-testing station for testing of
each pipe.
U.T. / Ultrasonic testing station for
NDT weld flaw detection.
End X-ray / continuous radiography.
Finishing station and final inspection
station. |
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