Thursday, May 02, 2013

Size of the matter – offshore ergonomics prepares for an overhaul

Offshore Technology by Heidi Vella 22 April 2013

A new study measuring the size of offshore oil and gas workers' bodies is currently underway, with the aim of improving ergonomic safety on rigs. It is the first study of its kind for more than twenty years.

Industry data reveals the offshore oil and gas work force is on average 19% heavier than it was in the 1980s.
To accurately quantify the current body size of offshore workers, the Robert Gordon University in Aberdeen is conducting a two-year study using 3D scanners to measure the size of the workforce.

The study has provoked an interest in the health and fitness of the workforce, which is known to be an ageing group, as well as concern about the safety implications of a heavier, and therefore presumably larger, workforce operating in a space originally designed for smaller people.

"We want to make the industry aware of the size of the actual people working there. We need to not expect the size that would have suited them [workers] three decades ago to suit them now," project leader at RGU, Dr Arthur Stewart, says.

The team will divide people into weight categories and map their size and variability with up to six concise scans.

"Shoulder width and chest depth are two critical dimensions we are going to be measuring, which might critically affect the ability of two people to pass each other in a narrow corridor," says Dr Stewart.
The data, which will be owned by Oil & Gas UK, will be made freely available to the industry.

Oil & Gas UK and Dr Stewart's team believe designing rigs with current, and not old, data will lead to rigs with better ergonomic safety. But what aspects of offshore safety are most affected by a larger workforce?

"What I see as the biggest impact is on helicopter transportation," says industry ergonomics advisor, Tim Southam, from PTP-Global Ltd.

Helicopters that transport workers to and from rigs, sometimes for an hour and a half at a time, can be dangerous. Last year there were two helicopter ditches in the North Sea involving Super Pumas, with four helicopter ditches in four years.

Not only do larger people take up more room and make for a particularly uncomfortable ride - as many industry insiders have testified to, including Southam - but if a helicopter ditches, workers need to be able to squeeze through small spaces to quickly exit the vehicle.

Health and Safety Policy Manager at Oil & Gas UK, Bob Lauder, says that the industry has already made adjustments to life boat capacity and payloads on helicopters have been adjusted in accordance with a Big Person study that Oil & Gas UK carried out a few years ago, which showed them the body size of the industry workforce is increasing. Also, in 2005, the Civil Aviation Authority increased the weight allocation for each helicopter passenger by 20lbs, from 14 stone to 15 stone 6lb.

Southam also warns that decades' old rig designs servicing people that are now on average bigger can affect special factors, such as crawling under pipes, the size of beds, living space and shower cubicles.
Dr Stewart agrees, he says: "If you can imagine an emergency situation, body size, when you're trying to move quickly and urgently, can become potentially critical, particularly if you are trying to escape through a narrow window for example."

However, not all concur. John Taylor from offshore workers' union Unite says: "The size of your body mass doesn't make a blind bit of difference getting out of a corridor, it doesn't make any difference in the accommodation. The only problem would be if a person became that overweight he couldn't escape out of a window in a helicopter."

Dr Stewart and Lauder stress that the study, which is funded by Oil & Gas UK and major offshore companies, isn't focussing on the weight or health of offshore workers, although weight will be recorded.
However, they both concede that health relates to body size; therefore it is almost impossible to talk about one without considering the other.

Transocean has recognised this problem and are addressing it by offering healthy eating and fitness assistance to workers with a waist of more than 37 inches, which both Lauder and Taylor support.

However, unlike Norway, where 120kg is the largest an offshore worker is allowed to weigh, in the UK there is no automatic cut off figure that prevents people working offshore, though anyone with a BMI of more than 40 is required to satisfy a number of additional conditions before they are passed as fit to work offshore.



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