Longitudinally Submerged Arc Welded Steel pipes. – Longitudinal edges of steel plates as raw material, are first beveled using carbide milling equipment; Beveled plates are then formed into a U shape using a U-press and subsequently
into an O shape using an O-press.UOE is the name of the method used for production of longitudinally welded large
diameter pipes.
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Longitudinal edges of the plates are then tack welded followed by internal and external welds, using double-sided
submerged arc welding and flaring from production.

The coherence of cutter head and plate clamping system guarantees the invariable parameters during the entire
milling process; accordingly, it ensures the milling quality and lays a good foundation for the success of subsequent

Pipes manufactured by this process are subjected to expanding operation to relieve internal stresses and obtain a
perfect dimensional tolerance.

After the pipes are conveyed to cold expansion, hydrostatic testing and NDT inspection, the pipes will be subject to
final inspection for the compliance to customer requirements.

Standard Manufacturing

– ASTM 53
– API Spec 5L
– ASTM A252-89, EN10217, EN10219

ERW pipe is a high-speed production product, that can be made in continuous lengths up to 115’(35m). It produces
uniform wall thicknesses and outside dimensions and is made in a wide range of specifications.
It does, however, require minimum tonnage to set up on a specific size and sometimes has long lead times.

Steel grades

– 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