Marine, Pedestal and Offshore Crane Inspection to API 2C and Class Rules

Marine and offshore cranes work in the environment least forgiving of deferred maintenance: constant salt exposure, dynamic loading from vessel motion, and lifts made between two moving bodies. They also fail where inspection is hardest, inside the pedestal, at the slew bearing and within wire rope cores that look sound from outside. itmad inspects and load tests marine, pedestal and quayside cranes, to API 2C and API RP 2D and to class society rules. itmad operates across the Middle East, Asia and Europe. Last reviewed: October 2026.

Equipment covered

Offshore platform pedestal cranes, on fixed platforms and jack-ups, are inspected including the pedestal and its connection to the structure, to API 2C and the operator's requirements. Deck cranes, provision cranes and davits on supply vessels, barges and merchant ships are inspected to class society rules and flag state requirements, and port and quayside cranes, whether ship-to-shore, mobile harbour or quayside, are inspected including rail, travel and structural condition. Offshore containers and baskets, meaning cargo carrying units, skips and frames certified for offshore lifting, are covered with their padeyes, slings and primary structure.

What marine inspection adds

A pedestal crane is inspected as a land crane plus everything that the marine environment introduces, and the additions are where findings concentrate. The pedestal structure and its connection to the deck or platform are examined for cracking at the welded connection and for corrosion inside the pedestal, where access for inspection is poor. The slew bearing is checked for bolt torque and for tilt or rock, with attention to corrosion at the bearing interface.

Wire rope is assessed against ISO 4309 with particular regard to internal corrosion, which in salt service progresses in the core while the outer wires still look serviceable. Coating breakdown and corrosion are mapped across the boom, structure and pedestal, and the boom rest, stowage and sea fastening arrangements are examined. Emergency and manual lowering under loss of power is tested, dynamic and offlead or sidelead considerations are assessed where lifts are made to or from a moving vessel, and where the crane is used for man riding the personnel transfer arrangements are inspected to the tighter criteria that apply.

Standards and class rules

Inspection is carried out to the standard that the contract, the operator or the classification society specifies. Those most commonly applied are API Specification 2C for offshore pedestal cranes and API RP 2D for operation and maintenance, together with the rules of the relevant class society (ABS, DNV, Lloyd's Register or Bureau Veritas) and ISO 4309 for wire rope discard criteria. Offshore containers are inspected to DNV 2.7-1 and EN 12079 where those govern, and the manufacturer's inspection and maintenance requirements are applied alongside.

Load testing offshore

Proof load testing offshore is constrained by what can be lifted and where it can be placed. Water bag systems are used where fixed test weights cannot be brought to the location or safely handled, with load cell measurement recorded throughout. Testing covers the radii and configurations that matter for the crane's actual duty, with overload protection, brakes and emergency systems verified and the structure examined afterwards.

Offshore containers and lifting sets

Cargo carrying units lifted to and from offshore installations are certified separately from the crane. The inspection covers primary structure and padeyes, sling sets and their certification, identification and plating, and the condition of the unit against DNV 2.7-1. Units are colour-coded and registered, with re-examination at the interval that the standard sets.

When inspection is required

Periodic examination is required at the interval that the class society, operator or governing authority sets, covering the annual thorough examination and the more extensive periodic examination at longer intervals. Inspection is also needed before mobilisation of a vessel or unit to a new contract; after structural or weld repair or replacement of a load-bearing component; after an overload, snatch load or incident; following a period of lay-up or extended inactivity; and where the crane is to be used for personnel transfer. Attendance is scheduled around vessel movements and offshore rotations.

What the client receives

An inspection certificate in the format that the class society, operator or authority requires, and a report that identifies the crane or unit by serial number, capacity and location. Findings are recorded component by component with photographic evidence, defects are classified by severity, and load test results record the applied load, radius and post-test condition. The report includes the wire rope condition assessment against ISO 4309, and containers and lifting sets are colour-coded and the register updated.

Frequently asked questions

What equipment does marine crane inspection cover?

Offshore platform pedestal cranes, vessel deck cranes, provision cranes and davits, port and quayside cranes, and offshore containers and baskets. Each is inspected to the standard or class rules that apply to it.

What does marine inspection add to a land crane inspection?

The pedestal structure and its connection to the deck, corrosion inside the pedestal, the slew bearing, internal wire rope corrosion, coating breakdown, stowage and sea fastening, emergency lowering, dynamic lifting considerations and personnel transfer arrangements. Findings concentrate in these additions.

Why is internal wire rope corrosion a particular concern?

In salt service, corrosion progresses in the core while the outer wires still look serviceable, so the rope can fail while appearing sound. Wire rope is therefore assessed against ISO 4309 with particular regard to internal corrosion.

Which standards and rules apply?

API 2C for offshore pedestal cranes, API RP 2D for operation and maintenance, the rules of the class society (ABS, DNV, Lloyd's Register or Bureau Veritas), ISO 4309 for wire rope, and DNV 2.7-1 and EN 12079 for offshore containers. The manufacturer's inspection and maintenance requirements are applied alongside.

How is load testing done offshore?

Water bag systems are used where fixed test weights cannot be brought to the location or safely handled, with load cell measurement throughout. Testing covers the radii and configurations that matter for the crane's actual duty.

When is inspection required?

At the class society's, operator's or authority's interval, before mobilisation to a new contract, after structural repair, after an overload or snatch load, after a period of lay-up, and where the crane is used for personnel transfer. Attendance is scheduled around vessel movements and offshore rotations.