NORSOK R-002: Lifting Equipment Explained

You need a winch, davit, lifting appliance or handling system for an offshore installation. The mechanical solution may look straightforward. Meeting the requirements that come with offshore lifting equipment can be considerably less so.

NORSOK R-002 addresses lifting equipment used on offshore installations and brings requirements for design, materials, fabrication, safety, testing and documentation into the same project.

It starts before fabrication

Compliance is not something to add when the equipment is finished.

Loads, operating conditions, interfaces, lifting arrangement and intended use can influence the design from the beginning. Decisions made during concept development may determine what calculations, safeguards, materials and verification are required later.

For custom equipment, establishing the applicable requirements early can save a painful redesign.

More than the steel structure

A compliant lifting system is rarely just a fabricated frame with a winch or cylinder attached.

Mechanical components, controls, brakes, limiting devices, hydraulic or electrical systems and operator interfaces may all form part of the safety concept. The exact requirements depend on what the equipment does and how it will be operated.

That makes system integration just as important as the individual components.

Documentation follows the equipment

Material certificates, calculations, drawings, welding documentation, inspection records and test results are not separate paperwork exercises.

They provide traceability from the engineering basis through fabrication and testing. If documentation requirements are discovered after components have been purchased or steel has been fabricated, recovering that traceability can become difficult — and sometimes expensive.

A simple lifting problem can become a complex project

Consider a custom winch required for an offshore operation. At first, the specification might appear to be little more than line pull, speed, rope capacity and available space.

Then the real engineering begins.

Where will it be installed? What loads can reach the structure? What happens if power or hydraulic pressure is lost? How is uncontrolled movement prevented? How will the operator control the equipment? Which environmental conditions apply? What needs to be inspected and tested before the equipment can enter service?

Those questions affect different parts of the project, often involving several disciplines and suppliers. Waiting until fabrication to resolve them creates a difficult situation: changing one interface can affect the structure, hydraulics, controls, documentation and testing plan.

GravityX brings those pieces into the project from the start — coordinating engineering, fabrication, documentation, testing and the relevant verification activities around the equipment that actually needs to be delivered.

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