Double Girder Circular Crane

When capacity exceeds roughly 20 Ton, the track diameter is large, or the duty is continuous — the twin box girders give the stiffness and hook height that a single girder cannot provide over long radial spans.

A crab winch unit runs on rails on top of the two girders, giving true vertical lift and full radial travel from the pivot to the outer rail, with creep speed for precise placement.

The pivot bearing carries the inner reaction while the outer end carriage runs on double-flanged forged wheels; drive and guide rollers keep the bridge tracking true against the circular rail through every revolution.

Water and effluent treatment plants, cement and mineral storage domes, power plant circular halls, and process industries with circular reactor or blending vessels.

Structures are NDT checked at critical welds and the crane is proof-tested at 125% of Safe Working Load. On site we run a full slewing trial through 360° with the rated load before handover.

Yes — the bridge, pivot and outer rail are engineered to the diameter you give us. Send the internal diameter and rail-level elevation and we design the crane around the structure you already have.

Outdoor installations get IS 875 wind-load design, storm anchors at the parking position, weatherproof IP-rated panels and a UV-stable PU topcoat over epoxy primer.

Double girder circular cranes are typically manufactured in 8–12 weeks from drawing approval, with rail material dispatched early so civil work runs in parallel.