SQ6.3SA3T Marine Crane on a Cargo Boat in the Maldives

A yellow telescopic crane on the deck of a cargo boat moored at a sandy quay, lifting bundles of sacks in round slings: a video from our customer in the Maldives shows a BOB-LIFT SQ6.3SA3T telescopic marine crane unloading cargo.

At a glance: SQ6.3SA3T 6.3 t telescopic marine crane · Maldives · cargo boat at a quay · 1 customer video.

What the video shows

• The boat. A green cargo boat with a white and red wheelhouse lies alongside a quay. Its deck is stacked high with sacks.
• The crane. The crane stands on the deck behind the railing. Its yellow boom, marked BOB-LIFT, is raised steeply, and the dark extension section is pushed out.
• The lifts. Each load is a bundle of sacks hanging in round slings from the hook. Crew members on the cargo stack hook on the slings and guide the load as the crane lifts it.
• The harbour. A white vessel with life rings is moored next to the boat, and a breakwater lines the clear blue water behind.

This is the customer's own video. No load weights, dates or comments came with it.

SQ6.3SA3T specifications

The SQ6.3SA3T is a 6.3 t telescopic boom marine crane with a maximum lifting moment of 15.75 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 SQ6.3SA3T lifts 6,300 kg at 2.5 m but only 1,200 kg at 8.6 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.

Raising the boom brings the hook closer in and the rating up: at 60° with the boom fully extended, the crane is rated for 2,200 kg at 4.52 m.

The SQ6.3SA3T product page has the full drawings, and other models of this size are on the 6.3 t telescopic boom marine crane page. The same model stands on a harbour quay in our delivery record from Ecuador, and a 5 t telescopic marine crane stands on a quay in our other record from the Maldives.

Unloading bagged cargo with a deck crane

With its own crane, a cargo boat can unload at a quay that has no crane. Bagged cargo comes off in many small lifts, so the details matter. Four points to plan for:

1. Weigh one bundle first. Count the sacks in a bundle and know the weight of each sack. At 6.4 m the crane is rated for 1,800 kg, at full reach 1,200 kg.
2. Use slings in good condition. Round slings take every lift of the day. Check them for cuts and wear, and replace damaged ones at once.
3. Keep the crew out from under the load. People on the cargo stack must step back before the bundle lifts, and never stand under it as it swings to the quay.
4. Watch the boat as it unloads. As the deck gets lighter, the boat rises and can heel. Unload evenly from both sides and check the moorings.

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 deck mounting in more detail.

What to send us for a marine crane

To check a crane like the SQ6.3SA3T for your cargo boat, 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 SQ6.3SA3T needs 40 L/min at 20 MPa, about 22 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 video and the technical department's drawings.