COSL has taken measures to ensure a rig which was damaged during freak waves is protected from future impact.
One worker and two others were injured in the incident last month on the COSL Innovator rig as Storm Frank battered the North Sea.
Damage caused by the weather is currently being repaired, while similar solutions are to be considered for the rest of the company’s rig fleet.
The company said temporary procedural changes are being implemented on the rig to ensure the safety of staff.
The rig is currently operating in Statoil’s Troll field.
A spokesman for the company said safety continued to be its “highest priority” adding that a similar event was not expected to occur again.
The move will see the exposed windows of the rig exposed covered partially or completely.
A spokesman said: “COSL has, in consultation with the safety delegates, employees and the local unions of IE, Safe and DSO, decided to temporarily cover the exposed windows of the rig partially or completely. Different solutions have been chosen for the different decks.
“Parts of the former window structure will thus have the same strength as the rest of the hull. The solution selected exceed the regulatory requirements of DNV GL and is performed pending on the investigation groups’ conclusions and possible regulatory changes.
“It is so far not revealed any faults with widows or rig design, but we have decided for a more robust, temporarily solution to ensure the safety of the crew. “
Both the PSA and Statoil are informed of the measures currently being undertaken on the rig.
Aker Solutions employee Rune Morten Narvag was killed last month during the incident while two Statoil workers were also injured.
The rig was on contract to Statoil in the Troll field west of Bergen when the accident happened.
The wave hit the rig at the mid-point of two decks of the living quarters that spans one side of the rig at a height of about 20 to 25 metres above the water level.
It broke through six cabin windows of the lower deck and 11 on the middle deck.
Tributes were paid to the industry veteran, who started his career in the oil and gas industry aged just 16-years-old.
Staff at Aker Solutions held a moment of silence for the worker, who was described as “hearty” and “sociable and engaged”.
A spokeswoman said: “Rune was very comfortable at sea, and he had worked on several different vessels and rigs these years. He was a sociable, engaged and hearty person who often was the centre of attention in a group.
“He knew how to talk to a crowd, had a solid memory and was very competent. Rune was focused on improvement and several of his suggestions were utilized.
“For us in Aker Solutions this incident is very sad and our thoughts go to those who were close to Rune. We have lost a highly cherished colleague who will be deeply missed.”
Earlier today it was revealed Statoil has evacuated around 250 workers from platforms in the North Sea after warnings of very high waves caused by strong winds.