Have you ever looked at an offshore platform's steel structures and wondered how those offshore cranes installed on platforms?
We've supplied maritime lifting equipment for over 20 years and completed dozens of offshore crane installations. Every lift is a carefully coordinated job combining engineering, marine logistics, and strict safety rules. Offshore cranes aren't simply hoisted onto decks and bolted down. Design, sea transport, assembly, and commissioning must all account for salt corrosion, deep water, and remote operating sites.
I'll walk you through the whole workflow, share real site lessons, and show how proper crane design reduces installation risk and cuts costly downtime.
Design & Customisation Before Offshore Lifting
Before fabrication starts, we work closely with platform operators to tailor cranes for site conditions. Some platforms need heavy-lift cranes for construction and supply deliveries. Others need compact units for maintenance and cargo handling.
Our offshore crane lineup includes:
- Versatile pedestal offshore crane, built for heavy lifting on platforms with ample deck space
- Space-saving kingpost deck crane, designed for platforms with compact deck layouts
- Offshore foldable boom crane with reduced transport dimensions, suitable for lifting small supplies and spare parts on platforms
- Knuckle boom offshore crane featuring a low centre of gravity, ideal for heavy-lift tasks involving subsea operations
Regardless of model, our design review verifies the platform's deck load capacity, available working space and platform specifications.
Fabrication & Marine Transportation
Once finished at our yard, offshore cranes are shipped by sea, unlike land cranes transported by road. Transport planning has two core objectives: protect the crane against damage and ensure safe stowage aboard carrier vessels.
Standard offshore pedestal cranes are shipped in separate sections: pedestal base, tower and boom. The operator cabin and upper assemblies are disassembled for shipment to save transport space and reduce offshore lifting challenges.
Offshore foldable boom cranes and knuckle boom offshore cranes deliver major transport advantages. Their articulated booms fold compactly to reduce transport height. This enables the use of smaller carrier vessels and avoids height clearance restrictions from port bridges and overhead power cables. Our fully foldable boom cranes can be shipped as a complete unit, ready for bolting or direct welding onto pre-prepared base structures on offshore platforms.
YFM develops custom transport solutions tailored to each offshore crane's actual dimensions, weight, transport method, and site installation conditions.
Offshore Installation Using DP Lifting Vessels
Installation takes place on specialised crane installation vessels fitted with dynamic positioning (DP). These vessels maintain steady positioning even in 10 ft swells, with onboard heavy-lift cranes capable of lifting dozens of tonnes onto platform decks.
Once on station, crews set up gangways for safe personnel transfer between vessel, and platform.
Weather is our main limiting factor. Lifting stops when wind exceeds 20 knots or waves rise over 2 meters. Our team monitors forecasts weeks ahead. A single storm can delay the whole project by a week, so thorough planning is essential.
Step 1: Mount the Pedestal Base
When sea conditions are acceptable, we first install the pedestal base, the crane's main foundation, typically weighing 20–50 tonnes.
The installation vessel lifts the base onto pre-marked bolt holes. The platform team pre-reinforces and levels the deck; even minor tilt creates dangerous load-shifting risks later.
Guide pins temporarily align the base. High-strength bolts are torqued to precise values. We perform MT or PT inspection on critical bolted connections to detect hidden defects.
Step 2: Fit Tower, Boom, Cabin & Hydraulic Systems
Next, we lift and install the tower, boom, operator cabin, and hydraulic packages. For pedestal cranes, the boom is lifted as a single piece and mounted onto the central pedestal. Precise alignment is critical. Minor misalignment may prevent the tower from fitting onto the pedestal and result in insufficient bolt tension, which could lead to crane overturning. Our engineers can be dispatched to provide on-site installation supervision, working closely with the lifting team to adjust lifting angles.
Knuckle boom cranes are installed with their boom folded. After mounting, the articulated boom extends and locks into place via the hydraulic system, reducing manual offshore commissioning work.
Once the boom is secured, technicians connect all hydraulic hoses, power cables, and control cables. All connections must be tight and leak-free before commencing testing.
Mandatory Load Testing Before Handover
No installation is finished without load testing, to confirm performance under real offshore operating conditions.
- Static load test: Lift 125% of the rated working load and hold for 10 minutes, checking for structural weaknesses in pedestal, boom, and joints.
- Dynamic load test: Lift rated load and run full crane motions including hoisting, luffing and slewing. Emergency stops and limit switches are fully verified.
Hydraulic settings are fine-tuned to ensure smooth operation as the platform moves with waves. The crane can only enter service once all tests pass.
Post-Installation Support & Maintenance
After our offshore cranes pass no-load and load tests at our factory and are ready for delivery, our service does not end. We offer installation supervision, operator training, safety guidance, regular site visits, and lifetime technical support.
Offshore cranes operate under harsh conditions with constant salt spray, strong winds, and heavy-duty cycles. Routine inspections of hydraulics, electrical systems, and steel structures help extend the crane service life.
For customers upgrading ageing equipment, our pedestal offshore cranes can be retrofitted onto existing platforms without extensive deck modifications.
Ready to Source Your Offshore Crane?
There is no universal crane for every platform. Deck size, load requirements, and vessel availability all shape the solution. We support you through design, fabrication, shipping, and offshore installation, delivering durable cranes and experienced engineering support for remote locations.
Contact us to discuss your project requirements. Whether you need a compact kingpost deck crane, heavy-duty pedestal offshore crane for deepwater work, or a space-saving knuckle boom crane, we can build a lifting solution matching your platform.
References
API RP 2D, Operation and Maintenance of Offshore Cranes, American Petroleum Institute.
ABS, Guide for Certification of Lifting Appliances, American Bureau of Shipping.
IMO MSC.1/Circ.1580, Guidelines for Vessels and Units with Dynamic Positioning Systems, International Maritime Organization.
OTC, Technical Papers on Offshore Heavy-Lift Operations, Offshore Technology Conference.