A-frame simplifies ROV launching

MacArtney has developed a new articulating A-frame it says is safer and more convenient to deploy.

Offshore staff

ESBJERG, Denmark -- MacArtney has developed a new articulating A-frame it says is safer and more convenient to deploy.

Operators can access the top of the A-frame from the deck of the ship. The hydraulic design, employing two rams, articulates the A-frame a full 149° from the 20° angle for launching equipment over the vessel’s side or the rear to 11° over the deck.

MacArtney claims a high total safe working load of 89 kN throughout the process, and a safety factor (Psi) of 2.5. Luffing is at 48.5 kN with docking head and 89 kN without docking head.

A full ROV launch system can be installed on the A-frame on deck by crew members working at deck level and readied for launch. Once all operators are clear, the A-frame can be lifted, past 90° and over the side or rear of the vessel and lowered to 20° for launch into the water.

The process is reversed for retrieval, with the A-frame being raised past the 90° point and lowered to 11° over the vessel deck. This also makes service and maintenance work easier and faster, MacArtney adds.

12/27/2011

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