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HSE issues cold store guidelines

The HSE has issued cold store safety guidelines following its investigation into the failure of the ceiling of a frozen food store, which resulted in a fatality.

Following the accident, the investigation revealed that the bolts had consistently failed at the point where the thread entered the metal nut which secured them into the supporting frame.  Tests have identified fatigue and corrosion (due to oxidation and exposure to chlorine) as the main reasons for the deterioration of the bolts.

Two men fell to the floor of the store when insulation panels separated from the steelwork, which supported the ceiling. One of the men died from his injuries.

The insulation panels consisted of a sandwich of steel sheets bonded to polyurethane foam. These were bolted to a metal support frame, with engineering grade plastic bolts. The manufacturer of the panels and bolts is unknown. The design is believed to have been common and there are likely to be many of these stores still in use.

Some of the bolts which had failed dropped down slightly but remained within the panels; others were flush but had also failed. Therefore there were no obvious signs of failure

HSE reminds dutyholders that:

  • Ceilings and roofs should be presumed to be fragile until it is proved that they are not.
  • Environmental conditions may cause deterioration of ceilings, roof claddings or their supports, making them incapable of taking a persons weight.
  • Panels should not be used as a working platform unless it has been confirmed by a competent person that both the panels and their supports have been specifically designated for that purpose and are suitable.
  • Guidance on loading capacities should always be sought from the manufacturer/supplier if possible
  • Where frequent access is required then independently supported walkways should be installed, or boards used to spread loading for other prolonged work activities. Again, guidance from manufacturers, suppliers and designers should be followed

HSE asks dutyholders, with structures containing insulation panels that are suspended in a similar manner, to:

  • Ensure that access to these panels is prevented until their condition is established
  • Carefully examine the fixing / support systems from underneath for signs of deterioration;
  • If repairs are required, seek the advice of designers and manufacturers.

For further info http://www.hse.gov.uk/safetybulletins/coldstoreceilings.htm

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