Improving safety standards for workboat launch and recovery

In higher sea states, boats need to be hoisted clear of the water quickly enough to avoid being lifted by the next wave (Photo: Vestdavit) In higher sea states, boats need to be hoisted clear of the water quickly enough to avoid being lifted by the next wave (Photo: Vestdavit)

DNV GL is reviewing a new voluntary certification standard covering the davits used to launch and recover workboats and tenders writes Dag Pike.

The new standard includes some of the design features that davit manufacturer Vestdavit has long advocated for safer and more efficient boat handling.

According to Vestdavit, the need for these standards has been brought into focus by the development of smarter, more complex davit designs, where lack of clarity on documentation can lead to incorrect use, and potentially to accidents. DNV GL's proposed standard observes that existing certification approaches for non-lifesaving launching appliances are based around lifeboats’ davit standards rather than being specific to many workboat systems. This is an approach that it does not believe meets market or customer requirements, according to the class society.

To address this problem, the new standard for non-LSA davits emphasises solutions that are more forgiving of system and human failures. The standard calls for more redundancy in critical components, control and monitoring systems, painter arrangements, launching cradles and radio remote control systems. It also includes criteria on where to position the davit on a mother-ship, and for winches themselves and release mechanisms. In addition, the standards move with the times by opening the way for fibre rope use for the davit falls instead of insisting on wire ropes.

The new standards also recommend inclusion of an efficient shock absorber to dampen forces on boat launch and recovery, to limit the dynamic effect caused by the interaction with the waves.

The standards also accept the direct connection between equipment performance and different sea states; today, IMO SOLAS requirements offer only minimum handling speeds for davit lifting and lowering operations regardless of sea conditions. In higher sea states, boats need to be hoisted clear of the water quickly enough to avoid being lifted by the next wave. When that wave subsides, the rope is slack, and the boat and its occupants can drop dangerously. A Vestdavit spokesperson commented, “We have consistently argued that basing operations on the sea state in which the vessel is operating is not only favourable, but essential for safe boat handling.” Vestdavit has supplied over 1700 specialised davit systems that incorporate a variety of safety features.

Latest Press Releases

Concordia Damen ships 18 hulls from Shanghai to Rotterdam

On Monday, 17th June, heavy-lift vessel Black Marlin departed Shanghai. On deck with eighteen Concor... Read more

Damen Shipyards welcomes Mexican cadets and crew of the ARM Cuauhtémoc during Sail Scheveningen

Due to the port visit of the Mexican Sail Training Vessel ARM Cuauhtémoc to Scheveningen, the Nether... Read more

Keel laid for the first of Damen’s revolutionary new FCS 7011 Crew Change

Two and a half years on from the genesis of the FCS 7011 concept in response to extensive feedback f... Read more

First European conversion of a dredger to dual-fuel LNG / MGO departs Damen Shiprepair Dunkerque

First European conversion of a dredger to dual-fuel LNG / MGO departs Damen Shiprepair Dunkerque Read more

Damen Oskarshamnsvarvet Sweden achieves coveted AAA credit rating

Damen Oskarshamnsvarvet Sweden achieves coveted AAA credit rating Read more

Damen signs Phase II contract with International Organization for Migration

Damen signs Phase II contract with International Organization for Migration for nine additional SAR... Read more

View all