Functional safety: Food for thought
15 March 2017
Adequate safety procedures must be in place in food processing plants, as Jorgen Saxeryd, safety products and functional safety advisor to ABB’s food and beverage program, explains
In 2014 in the UK, a large food manufacturer had to pay an £800,000 fine after a serious industrial accident. An engineer was trapped by machinery while examining a conveyor belt and suffered a major injury and ongoing nerve damage. An investigation revealed that this dangerous accident could have been prevented if a guard had been in place on the machine.
Across the globe, there are a variety of different regulations for food processing plants. In particular, North America and Europe have strict regulations for safety in these potentially dangerous environments. This also applies to the safety of employees in the processing plants and employers who fail to make adequate safety considerations can face large fines. Not only can these authorities enforce these in the case of accidents, they can also be enforced during regular inspections.
In Europe, the Machinery Directive 2006/42/EC requires machinery to be designed and built so it can be used safely. In food processing plants, there are many dangerous machines for which plant managers should follow safety regulations, or the plants may face closure or high fines. Machines such as decanters operate at high centrifugal forces and it is not unknown for the machine's g-forces to reach more than 2000 times gravitational force. This is clearly a dangerous environment for employees to work in, however as these machines are essential for use, the key concept is the management of risk.
In the 1970s, the increase in heavy machinery such as the creation of the steel press led to increased safety guards. Since then, many safety conscious companies undertake a risk analysis in the initial stages of machine development. In the case of decanters, it is not possible to remove the risk, but it is possible to mitigate the risk to an acceptable level by putting safety guards such as enclosures or emergency stops into place.
Often, companies find it too difficult to manage the complex world of safety regulations alone. In this case, it is always better to consult professional services rather than to not comply with the regulations, as this will work out to be a costly mistake. ABB’s experts, for example, can provide specific advice on regulations, which also takes into account the needs of food processing plants.
As companies become more knowledgeable about regulations and regulations become more stringent, the need for retrofitting old equipment with additional safety measures may arise. Although it may seem instinctive, where there is a dangerous moving machine, the safest answer is not always to shut it away behind an enclosure or barrier.
In the food processing industry, companies should consult functional safety experts who have experience in the sector. The experts will for example suggest equipment such as light grid, which perform an emergency stop on a machine when a light grid is broken by an object. These devices are more appropriate for the food processing sector than using physical guards or barriers as they allow easier access for maintenance and washdown, which is essential for hygiene in food processing plants.
Managers of food processing plants in all countries, regardless of the country’s regulations, should consider safety as a priority in their plant. From the safety of single pieces of equipment to line safety and then plant safety, plant managers need to be aware of what they can do to mitigate risks. Plant managers not only have a responsibility to put in place an accurate safety strategy to protect their employees, but they also need to protect their businesses from costly infringements of worldwide safety regulations, as proven in the many cases gone by.