SQ5SA3T Marine Crane on a Harbour Quay in the Maldives

A yellow telescopic crane on a concrete quay in a small boat harbour, with sacks of cargo stacked beside it and speedboats moored below: five photos from our customer in the Maldives show a BOB-LIFT SQ5SA3T telescopic marine crane on a fixed base.

At a glance: SQ5SA3T 5 t telescopic marine crane · Maldives · concrete quay in a boat harbour · 5 customer photos.

What the photos show

• On the quay. The crane stands on a raised concrete block at the quay edge. Its base plate is bolted down, and a small control panel is fixed to the column.
• The crane. The retracted boom is marked BOB-LIFT and SQ5S, with a NO STANDING UNDER THE BOOM warning. The hook block is painted in yellow and black stripes.
• The cargo. White sacks and bulk bags are stacked on the quay next to the crane, and a blue tarpaulin lies at its foot.
• The harbour. Speedboats and small work boats are moored in clear turquoise water, with palm trees and white buildings along the shore.

These are the customer's own photos. No load weights, dates or comments came with them.

SQ5SA3T specifications

The SQ5SA3T is a 5 t telescopic boom marine crane with a maximum lifting moment of 12.5 t·m and three boom sections. All figures are read from the technical department's dimension and load chart drawings.

Lifting moment is the load times its distance from the slewing centre. That is why the rated load drops as the boom reaches out. For example, the SQ5SA3T lifts 5,000 kg at 2.5 m but only 1,060 kg at 9.06 m. Working radius is the level distance from the slewing centre to the hook. On a vessel or a quay, the pedestal takes the place of outriggers. It must be strong enough for the crane's weight and its full lifting moment. For general crane safety rules, see the OSHA cranes and derricks standard.

At 3.82 m from the slewing centre, with the boom retracted, the crane is rated for 2,900 kg; with the boom at 6.44 m it is 1,500 kg. The crane stands 2,150 mm high with the boom level.

The SQ5SA3T product page has the full drawings, and other models of this size are on the 5 t telescopic boom marine crane page. The same model works on a tracked carrier in our delivery record from Saudi Arabia, and a 6.3 t telescopic marine crane works on a harbour quay in our record from Ecuador.

A quay crane for a small harbour

On a small island harbour, one fixed crane can load and unload the boats that bring in supplies. Four points to plan for:

1. Build the quay foundation for the moment. The 680 × 680 mm base plate with 24 bolts must be anchored into concrete sized for the full 12.5 t·m moment, not only the 1,850 kg crane weight.
2. Match the reach to the boats. The crane lifts 5,000 kg close in but 1,060 kg at 9.06 m. Measure how far out the deck of the moored boat lies before you plan a lift.
3. Plan the power. On a quay, an electric motor can drive the pump. The SQ5SA3T needs 32 L/min at 20 MPa, about 18 kW, so check the supply first.
4. Protect the crane from salt and sun. Rinse salt off the crane, grease the slewing ring, and cover the controls when the crane stands idle.

Sea water is hard on steel, so the marine cranes get an epoxy zinc primer with a polyurethane acrylic top coat. Other capacities are in the telescopic boom marine crane range, and the marine crane buying guide covers mounting in more detail.

What to send us for a marine crane

To check a crane like the SQ5SA3T for your quay, we need a few details. Short answers are fine.

• The site. The vessel type and length, or the quay, and where the crane will stand.
• The lifts. The heaviest load, and how far from the crane it is picked up and set down.
• The power. The hydraulic power pack you have now, or whether you need a new one. The SQ5SA3T needs 32 L/min at 20 MPa, about 18 kW.

Send these through the contact page, and our team will check reach and load against the chart.

Record compiled by Achord Chan, Product Operations Director at BOB-LIFT, from the customer's photos and the technical department's drawings.