SQ20SA5T Marine Crane Installed in New Zealand

Our largest telescopic marine crane, the SQ20SA5T, went onto the deck of a working vessel in New Zealand. The customer took three photos beside a wharf. They show the crane being lowered onto its pedestal, the slewing base in place, and the boom stretched high over the deck.

At a glance: SQ20SA5T 20 t telescopic marine crane · New Zealand · pedestal installation on a working vessel · 3 customer photos.

Installation alongside the wharf

• Lowering onto the pedestal. A second crane lowers the SQ20SA5T on slings onto a raised pedestal on the deck. Fitters in bright safety vests wait on the walkway beside it.
• Slewing base in place. The crane's base sits on top of a tall, red pedestal at the side of the deck. A walkway with handrails runs past it. In this photo you can read the BOB-LIFT and SQ20S marks on the boom.
• Boom extended. Another photo shows the telescopic boom extended and raised high above the deck.
• Setting. The vessel lies at a concrete wharf with hills behind the harbour.

The customer sent photos only. No load weights, dates or vessel details were recorded with them.

SQ20SA5T reach and load

The SQ20SA5T is the largest crane in the BOB-LIFT telescopic boom marine range. It is rated at 20 t, with a 50 t·m maximum lifting moment. Reach and load figures are read from the technical department's drawing.

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 SQ20SA5T lifts 20,000 kg at 2.5 m but only 1,500 kg at 22 m. Working radius is the level distance from the slewing centre to the hook. On a vessel, 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 its full 22 m radius the SQ20SA5T is rated for 1,500 kg. Over the side of a vessel, many lifts happen far out from the slewing centre. That end of the chart matters most.

What the pedestal and the ship have to supply

On a truck, outriggers and the chassis carry the crane. On a vessel, the pedestal and the deck do that job. The ship's hydraulics drive it. For a crane of this class, check:

1. Pedestal and deck structure. They must carry the 6.95 t crane and the overturning moment of a 50 t·m crane. In these photos the pedestal stands well above the deck. The boom base sits above the handrails.
2. Hydraulic supply: 80+63 L/min at 25 MPa. The vessel's power pack should give about 55 kW.
3. Reach over the side: the distance from the slewing centre to where loads are picked up and set down on the quay. Read it against the chart above.

Sea water is hard on steel, so the marine cranes get an epoxy zinc primer. A polyurethane acrylic top coat goes over it. Specifications and the dimension drawing are on the SQ20SA5T product page. Smaller models are in the telescopic boom marine crane range. 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 SQ20SA5T for your vessel, we need a few details. Short answers are fine.

• The vessel. Its type, such as a barge or a work boat, its length, and where on the deck 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.

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 drawing.