SQ12ZA4T Marine Crane in a Stone Workshop in Germany

A red knuckle boom crane on a pedestal inside a stone workshop, lifting stone slabs, a stone block and a large saw blade: seven photos from our customer in Germany show a BOB-LIFT SQ12ZA4T knuckle boom marine crane working indoors.

At a glance: SQ12ZA4T 12 t knuckle boom marine crane · Germany · stone workshop · 7 customer photos.

What the photos show

• The crane. The folded boom is marked BOB-LIFT and SQ12Z, with a NO STANDING UNDER THE BOOM warning. The red column sits on a round pedestal on the concrete floor.
• The power. A blue hydraulic tank with an electric motor stands next to the crane, with a control box on the wall.
• Lifting slabs. Using yellow round slings, the crane lifts polished stone slabs from a wet floor and sets them down beside a cutting machine.
• A saw blade and a block. In one photo the crane holds a large circular saw blade on slings. In another, a yellow scissor clamp on the hook carries a stone block onto timber blocks. A carved stone bust stands by the wall.

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

SQ12ZA4T specifications

The SQ12ZA4T is a 12 t knuckle boom marine crane with a maximum lifting moment of 27 t·m. 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 SQ12ZA4T lifts 12,000 kg at 2.25 m but only 2,100 kg at 10.15 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 4.7 m from the slewing centre the crane is rated for 5,450 kg; at 6.45 m it is 3,750 kg. Folded, it is 2,600 mm long, 2,430 mm high and 1,250 mm wide.

The SQ12ZA4T product page has the full drawings, and other models of this size are on the 12 t knuckle boom marine crane page. A 12 t truck crane works in our delivery record from Argentina, and a 5 t knuckle boom marine crane is fitted on new work boats in our record from Egypt.

A marine crane inside a workshop

A pedestal crane built for ships also suits a fixed spot indoors, where heavy stone must move between machines. Four points to plan for:

1. Build the floor foundation for the moment. The Ø 1,127 mm base plate with 28 bolts must be anchored into a concrete foundation sized for 27 t·m, not only the 3,900 kg crane weight.
2. Plan the electric power. An electric motor drives the pump here. The SQ12ZA4T needs 55 L/min at 28 MPa, about 30 kW, so check the workshop supply first.
3. Check the headroom. At 75° the boom tip rises to about 12.6 m. Mark the roof height and keep the boom low enough indoors.
4. Use the right lifting gear. Soft round slings protect polished slabs, and a scissor clamp grips blocks. Count the weight of the slings and clamps in the load, and keep people off the wet floor under the load.

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 knuckle 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 SQ12ZA4T for your site, 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 SQ12ZA4T needs 55 L/min at 28 MPa, about 30 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.