Understanding Crane Capacities: A Simple Guide for Project Managers in Qatar
25 Aug 2026
By admin
Every crane has a headline capacity — 50 ton, 100 ton, 220 ton. But these numbers are frequently misunderstood by project managers, and that misunderstanding leads to dangerous undersizing or unnecessary overspend on rental.
This guide explains what crane capacity actually means, why the lift radius changes everything, and how to select the right crane tonnage for your Qatar project.
“A 100-ton crane can lift 100 tons — but only at the right radius. At 20 metres, it might only lift 30.”
What Does Crane Capacity Mean?
A crane’s rated capacity is the maximum load it can safely lift under ideal conditions — typically at the shortest possible radius (directly below the hook) and with the boom at its optimal angle. As the radius increases, the capacity drops significantly. This is governed by the crane’s load chart — a table or curve provided by the manufacturer showing safe lifting capacity at every combination of radius and boom length.
CRITICAL: Always request the load chart from your crane rental provider before confirming your booking. Without it, you cannot verify that the crane can safely perform your lift at your required radius.
How Radius Affects Capacity — A Practical Example
Crane Rating
At 5m Radius
At 10m Radius
At 15m Radius
At 20m Radius
50 Ton AT Crane
50T
32T
22T
15T
100 Ton AT Crane
100T
68T
42T
28T
220 Ton AT Crane
220T
140T
90T
58T
These figures are approximate and vary by crane model. The point is clear: the further the load is from the crane, the less it can safely lift. Always calculate your required lift capacity at your actual radius — not the headline tonnage.
Crane Capacity Selection Guide for Qatar Projects
Load Weight
Required Radius
Minimum Crane Size to Consider
Up to 10T
Up to 15m
25–30 ton mobile crane
10T – 25T
Up to 20m
50 ton all-terrain crane
25T – 50T
Up to 20m
100 ton all-terrain crane
50T – 100T
Up to 25m
220 ton all-terrain crane
Over 100T
Any
Crawler crane — consult lift engineer
Four Numbers You Must Have Before Booking
1
Load weight
The exact weight of the item being lifted, including all rigging and below-the-hook equipment.
2
Lift radius
The horizontal distance from the crane centre pin to the centre of the load at the pick-up and set-down points.
3
Required lift height
How high does the load need to travel? This determines boom length and configuration.
4
Headroom and obstructions
Are there overhead power lines, structures, or other cranes in the swing path?
Global Sources Qatar’s lifting team will review your load details and recommend the correct crane capacity for your project. Fleet ranges from 25T to 700T across Qatar.
