IMCA Safety Flash 12-23
IMCA has published Safety Flash 12-23.
Click to download the IMCA safety Flash 12-23 here.
Differential pressure: dummy choke ejected close to divers
A dummy choke insert was ejected from a water injection (WI) tree by force of differential pressure, while divers were working nearby. A Dive team was removing a dummy choke insert and replacing it with a choke valve insert. The WI tree had been subject to hydrate remediation works. With no hydrates evident, limited trapped or pressurised gas was expected and tested barriers and isolations were in place. During the removal of the half shell clamps that retained the dummy choke insert, unexpected differential pressure from the flowline forced the dummy choke insert (85kg in water) out of the choke valve body at significant force.
Crane boom stopper fell to main deck
A knuckle boom stopper pad fell to the main deck directly below the knuckle boom. No personnel were injured, however there was potential for serious or fatal injury. The incident occurred when a crane operator started moving the crane boom in prepration for use. Once the crane was clear of all obstructions the crane operator started slewing it outboard. The rigging supervisor acting as banksman was in attendance, located on the inboard dedicated walkway. As the crane boom was slewing, the crane operator saw the boom stopper sliding down the knuckle boom and then falling to the deck.
Fire alarm activation in engine room
There was a small fire in a vessel engine room. There was little damage and no-one was harmed. The incident occurred while a supply vessel was operating within the 500m Safety Zone of an offshore platform. An alarm appeared on the vessel’s fire alarm control panel, indicating a fire in the starboard side Engine Room cement compartment. Engineers investigated, observed white smoke and reported this to the Bridge. The Master decided to take the vessel out of the 500m zone, changed propulsion control mode to manual and then shut down the starboard main engine. The crew proceeded to muster stations.
BSEE: Swing rope transfers
A recent example of an injury incurred during a swing rope transfer, is a fractured foot sustained by a worker attempting to use a swing rope to board a satellite platform from a work boat. As the Captain manoeuvered the boat, the worker placed his foot on a bumper tire to position himself for the swing. The worker’s foot slipped between the tyre and the boat when the tyre hit the platform, resulting in injury.
Close approach of AHTS vessel to offshore rig
An AHTS vessel made a close approach to the mooring lines for an offshore rig. The AHTS was involved in anchor handling operations for the rig. The vessel passed anchor line #6 to the rig and started to move towards anchor line #3. Control of the vessel was transferred from forward to aft console. Once in position, the vessel received the PCP (Permanent Chasing Pennant) of anchor line #3 by rig crane and it was secured on the Karm fork. The rig’s crane was released, but the chaser’s collar slid on the anchor line towards anchor #3 and pulled the stern of the vessel to starboard, resulting in a bow side close approach to mooring line #2.
