Pandjiris MM-60/30-T Turning Roll 60 Ton

Constant-centre power roll for heavy tanks and vessels

The Pandjiris MM-60/30-T is a constant-centreline power roll for rotating cylindrical shells during circumferential welding, fit-up and inspection. It is rated at 60 tons turning and 30 tons support, with an electronic variable-speed drive covering 2.0 to 61.4 in/min. Because the wheel pairs move symmetrically, the centreline of the work stays at a fixed position as the diameter changes, which keeps a welding head or manipulator boom aligned without re-setting its height for every job.

The power roll is paired with the MI-30-T idler roll, which carries 30 tons. One MM-60 power unit with one MI-30-T idler supports a 60 ton cylinder. Pandjiris drives the rolls through spur gears for a positive power flow, and the design needs less floor space than conventional rolls of the same size.

Technical specifications

Setting up a roll line

Turning capacity and load capacity are separate checks. The load rating sets how much weight the wheels can carry, while the turning rating reflects the torque available to start and rotate an eccentric shell. Nozzles, manways, internal baffles or an unbalanced fixture all add eccentricity, so heavy unbalanced work may need a second power unit rather than a second idler.

Wheel spacing is changed in steps to match the shell; the sheet lists four spacing positions with wheel heights between 33.79 and 42.16 in. Keep the roll sections on a common level line and square to the shell axis, otherwise the work will drift along the rolls during rotation. Thrust rollers or anti-drift devices are used for long, thin-walled cylinders where drift is a concern.

Specify 460 V or 230 V when ordering, and confirm that the plant supply matches; 400 V or 415 V networks will need the voltage question raised at enquiry stage. When the roll line works under a submerged-arc head on a column and boom, the speed potentiometer on the pendant sets travel speed at the shell surface, so the welding parameters can be developed once and repeated on later shells of different diameters.

Documents and quotation

The Pandjiris MM-60/30-T specification sheet is attached under the documents tab. More positioning equipment is listed in Welding Robots & Automation.

For a quotation, send the shell diameter range, maximum weight, length, likely eccentricity, the number of power and idler sections required and the site voltage.