Lifting a Chiller or Generator onto a Rooftop in Abu Dhabi
How rooftop chiller, cooling tower and generator lifts are planned in Abu Dhabi: crane sizing by weight and radius, permits, building approval and timing.
Short answer: a rooftop chiller or generator lift is sized by the unit's weight plus rigging, and by the horizontal distance from the crane's centre to where the unit lands on the roof. That radius, not the weight, usually decides the crane. A 4 to 8 ton chiller landed 25 to 30 metres from the crane often needs a 100 ton class mobile crane, even though the load is small.
Why Radius Matters More Than Weight
A crane's capacity falls quickly as the load moves away from it. On a tower roof, the crane often has to set up on the road or a podium and reach over the building edge to the plant area. Measure from the likely set-up position to the final landing point, add the height of the roof and any parapet or screen wall the load must clear, and use those numbers to size the crane. Our guide on what size crane you need explains the method in detail.
| Unit weight with rigging | Short radius (under 15 m) | Medium radius (15 to 25 m) | Long radius (25 m and over) |
|---|---|---|---|
| Up to 3 tons | 25 ton crane | 50 ton crane | 50 to 100 ton crane |
| 3 to 8 tons | 50 ton crane | 50 to 100 ton crane | 100 to 200 ton crane |
| 8 to 15 tons | 50 to 100 ton crane | 100 to 200 ton crane | 200 ton crane or larger |
Approvals You Will Usually Need
- ✓Building management or facility management sign-off, with a method statement
- ✓A lift plan showing crane position, radius, load chart duty, and exclusion zone
- ✓Municipality approval and traffic management when the crane occupies a public road or pavement
- ✓The crane's third-party inspection certificate and the operator's licence
- ✓Confirmation from a structural engineer if the crane sets up on a podium slab
In downtown Abu Dhabi and on Al Reem Island, road-side lifts are often approved for night or early-morning slots, so plan the shutdown of the old unit and the electrical disconnection around that window. See our pages for Al Reem Island and downtown Abu Dhabi and Al Danah.
A Typical Sequence on the Day
- ✓Traffic management set up and exclusion zone barricaded
- ✓Crane positioned, outriggers set on mats, and load chart duty checked
- ✓Old unit disconnected, rigged, and lifted down to a waiting truck
- ✓New unit lifted from the delivery trailer straight to its plinth
- ✓Crane derigged and road reopened inside the approved window
Lifting the old unit out and the new unit in during the same visit saves a second crane mobilization and a second road approval. Ask the chiller supplier to deliver to match the crane slot.
Frequently Asked Questions
What size crane do I need to lift a chiller onto a roof?+
It depends on the chiller's weight with rigging and the radius from the crane to the landing point. Small chillers at long radius often need a 100 ton class crane. A site survey and the crane's load chart confirm the size.
Do I need a permit for a rooftop crane lift in Abu Dhabi?+
If the crane occupies a public road or pavement, you generally need municipality approval and traffic management. Building management will also ask for a method statement and lift plan.
Can a rooftop lift be done at night?+
Yes. Many city-centre lifts are approved for night or early-morning slots to keep roads clear. The crane supplier plans set-up and derigging inside that window.
Related Pages
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