Pemamek N150 2D Drive Unit Rollerbed for Pressure Vessels, 75 t

A powered two-roller drive for turning tubes, tanks and pressure vessels

The Pemamek PEMA N150 2D drive unit is a conventional powered rollerbed unit for rotating cylindrical workpieces under welding, cladding, grinding or inspection. Pemamek positions the N series as a range of basic solutions for rotating and handling a wide variety of cylindrical workpieces such as tubes, pressure vessels and tanks in automated welding. A power unit is usually combined with one or several idler units, and the N series covers loads from 12 to 1,600 tons.

The N150 2D is rated for 75 tons of workpiece load and 225 tons of rolling capacity with a rotation force of 110 kN. Four polyurethane rollers of 620 mm diameter run at 100 to 2,000 mm/min. Roller distances are adjusted manually with a stepped bolt arrangement to match the workpiece diameter, which keeps the unit simple and compact on the shop floor.

Technical specifications

Selecting a rollerbed set

A typical set pairs one drive unit with one or more idler units spaced to the vessel length. The load rating is the total, so with one drive and one idler each carries about half of an evenly loaded vessel; check the 50% and 100% diameter ranges in the table above, because a small-diameter vessel cannot use the full capacity (the full 75 t rating applies from 1,100 mm up).

Compared with the self-aligning A series, the N series uses manual diameter adjustment and suits stable, well-balanced workpieces such as tubes and tanks. The A series is better for unbalanced, thin-walled or conical parts. Pemamek also lists the N series as easy to integrate with column and boom manipulators. The datasheet describes the N series as occupying little space and as even in weight distribution, and states that the N150 models use a reliable and easy stepped manual diameter adjustment by means of a bolt arrangement, so the rollers are re-spaced between jobs by an operator rather than automatically.

Ordering and what to confirm before ordering

Quotation is by specification from the model name. Please provide the vessel diameter range, length, weight, whether a conical or out-of-round section occurs, the number of idler units and rail cars required, the welding process, and the supply. Plan the floor so the 4.67 m long unit and its cabling have space, and size the foundation for the unit weight of 4,000 kg plus the load.

For rotation and positioning of a smaller manual job compare the Pandjiris MM-60/30-T turning roll, or browse all Welding Robots & Automation.

When the vessel is tapered, ovalised or has uneven wall thickness, say so in the request, because the manually adjusted N series is intended for stable cylindrical workpieces and the self-aligning A series may suit those cases better. State the roller surface requirements as well.