Two SQ20ZA7 Knuckle Boom Cranes on a Platform Deck in Malaysia

Two red knuckle boom cranes on red pedestals, standing on the steel grating deck of a new platform by the water, with yellow railings and a city skyline across the sea: photos from our customer in Malaysia show BOB-LIFT SQ20ZA7 knuckle boom cranes after installation.

At a glance: SQ20ZA7 20 t knuckle boom crane · Malaysia · two cranes on a platform deck · 7 customer photos.

What the photos show

• The cranes. Two red cranes with the BOB-LIFT name stand on round red pedestals bolted into the deck. Each has a folding boom with black extensions and a red hook.
• The deck. The deck is open steel grating with yellow railings around the edges. Red steel beams show through an opening in the deck.
• The fit-out. Wooden crates, boards and bagged materials lie on the deck. A white cabin stands at one end.
• The crew. Workers in hard hats walk on the deck near the cranes.
• The setting. The platform stands over calm water. A lattice boom crawler crane works nearby, and tall apartment blocks line the far shore.

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

About the SQ20ZA7

The SQ20ZA7 is an earlier 20 t knuckle boom crane, here fitted on fixed pedestals. It is no longer in the current range, and the technical department has no current drawing for it, so this record does not quote load figures for it. For a new pedestal-mounted crane of this size, see the 20 t knuckle boom marine crane page, where each current model has its own 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, a load the crane lifts easily close to the column can be too heavy once the extensions are pushed out. Working radius is the level distance from the slewing centre to the hook. On a fixed deck, 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.

Two cranes on one deck let the crew lift at both ends of the platform without moving loads across it. A marine crane on a barge serves a drilling platform in our delivery record from Bahrain, and a 12 t marine crane works in a stone workshop in our record from Germany.

Cranes on a platform by the sea

On a platform over water, the crane is often the only way to bring tools and parts on board. Four points to plan for:

1. Check the deck under each pedestal. Grating alone cannot carry a crane. Each pedestal needs steel beams under it that are sized for the crane's full lifting moment.
2. Plan the reach of each crane. Mark which part of the deck and which landing points each crane can serve, so loads go to the right crane.
3. Protect against salt air. Wash down the cranes and check the paint, pins and hoses often in a marine setting.
4. Keep the work area clear. Rope off the area under the boom while lifting, and keep crates and bags out of the swing path.

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

What to send us for a marine crane

To match a current crane to your platform or vessel, 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.

If you run an SQ20ZA7 today, a photo of its nameplate helps too. Send these through the contact page, and our team will check reach and load against the current load charts.

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