VKS-Techno

Centering coupling influence (furtherCC) to the technological process
of anticorrosive insulation coating.

   Pipescoatedinsideby anticorrosive insulation haveuncolored areasat edges. Uncoloredareacoverspipe circle and has width from 30 till 50 mm from pipe end. Itisnecessaryforweldingworksduringpipelines assembly. Pipe is coated from external side after it coating from inner side. Process of external anticorrosive coating requires continuous pipes arrival to an extruder. In order to provide continuous pipe arrival it is necessary to eliminate the gap between moving in a flow pipe ends. Pipeshaveaxial curvature andtransportline adjustmentoriginally makes it impossible to synchronizeangular rotational velocities of coating pipes. It leads to pipe ends impact.  Jam of end chamfer occurs because of pipe ends impact and it is inadmissible according to regulations. This way of anticorrosiveinsulation coating leads to coating of pipes chamfer. It adversely affects the duration of welding during pipe fitting. Thistechnologyleadsto air binding under insulation layer in connection with moving of pipe ends relative each other. If a pipe has this defect it rejects as defective.

The source of its defects is axial shift of pipe ends. There is a special method for elimination of this technological problem:

Pipe ends are coiled from external side by preventivetape which can easily be removed. Then centering couplingis set in the internal side of pipe end and is fixed by special equipment. In the reverse side of its coupling rollers are set for pipe catching and centering of joints of two consecutive in a line pipes.

VKS-Techno centering coupling has weight 90 kg(Ф1420 мм.).Centering coupling has not only centering elements of pipe ends and it also has end props which are used for pipe ends protection from mechanical defects. Centeringcouplingisdesignedspecifically. Itdoesn’tneedto be changedtoother wall thicknesses. There are no defects (scratches, dents, risks, point defects, etc.) on a pipe body during disassembling of centering coupling. The rest of grit in a pipe doesn’t lead to scratches inside pipe in the end area. It reaches because of special rollers construction. Hard construction of centering coupling allows to producestrong and reliable end pipe centering during the whole technological cycle. Centering coupling produced by VKS-Techno has minimum number of elements and low coefficient of aerodynamic coefficient. Itmakespossibletouseitin coating technology with air suction cleaning inside a pipe to remove grit and pour off water.

Size range of our centering couplings:

-          for internal pipe coating diameters from Ф530 mm till Ф1420 mm are used;

-          without internal coating diameters from Ф110 mmtillФ 1420 mm are used.