Getting the load to the site is a separate engineering problem from lifting it
Definition
Heavy transport engineering plans and controls the movement of very large, heavy loads over short or long distances — from fabrication yard to quayside, or across a site — using self-propelled modular transporters or skidding systems, ahead of the final lift, float, or erection into position.
Why Heavy Transport Is Its Own Discipline
Route engineering, not just load capacity
A heavy transport route has to be checked for ground bearing pressure, gradient, camber and clearance at every point along its length, not just at the start and end positions. A route that works for one load configuration may not work for another.
The transfer points carry the highest risk
The moments of highest risk in a heavy transport operation are usually the transfer points — from fabrication yard onto SPMTs, from SPMTs onto a barge or foundation, across a gap between quay and vessel — not the transport move itself.
Weight and geometry both constrain the method
SPMTs distribute load across many axle lines and can handle very high total weights, but the load's footprint, centre of gravity and rigidity all affect which transport method is viable, independent of total weight alone.
Typical Methods Used
SPMTs use hydraulic suspension and all-wheel steering to move oversized loads while keeping the load level across uneven ground, and are the standard method for yard-to-quay and short-route heavy transport.
Skidding systems move a load along a fixed track using hydraulic rams or strand jacks, typically over shorter distances than SPMTs but where very high loads or constrained geometry make wheeled transport impractical.
Commercial Patterns Seen in Practice
The Bullwinkle jacket load-out is a direct heavy transport case: transferring an approximately 50,000-ton jacket from fabrication yard to launch barge across a 77-ft gap was the onshore engineering problem that had to be solved before the offshore installation record it enabled could happen at all.
Original diagram — EE&HL Network 2026
Frequently Asked Questions
Heavy transport engineering plans and controls the movement of very large, heavy loads over short or long distances using self-propelled modular transporters or skidding systems, ahead of the final lift, float, or erection into position.
Heavy transport moves a load horizontally to its staging or transfer position. Heavy lift raises, lowers, or installs the load into its final position. Many projects require both, in sequence, and the transfer point between the two is often the highest-risk moment in the operation.
SPMTs are wheeled, self-propelled platforms that carry a load and steer independently, suited to yard and quay moves over reasonable distances. Skidding moves a load along a fixed track using rams or strand jacks, typically over shorter distances where very high loads or tight geometry make wheeled transport impractical.