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Suppression options


fire suppression is only installed for enclosed conveyors. These are fitted with covers to contain the material being conveyed, usually because it contains excessive small particulate (refined) or is highly combustible or both. With panels fitted around the conveyors, it means they can be treated as enclosed spaces. It is quite common to install deluge


waterspray or watermist fire suppression for enclosed conveyors, with flame detectors stationed at the top of the conveyors and open nozzles projecting into the enclosure for its full length. Appropriately arranged machine interlocks should shut down all upstream equipment and conveyors to stop further in feed, whilst permitting downstream equipment and conveyors to continue so that they become emptied. On waste handling sites where automatic sprinklers are already installed, deluge waterspray systems can be connected to the existing fire pumps and tanks, provided that there is capacity in the design to cater for them operating. For non sprinklered sites, the deluge watermist systems come into play with their own dedicated water supply arrangement.


Under conveyors and platforms The spaces beneath conveyors and platforms are often littered with ‘fall off’ waste that has escaped the containment of the conveyors or at transfer points between equipment. This ‘fall


off’ waste collects on the floor and on top of equipment, cable trays, lighting and pipe racks. When a fire occurs around the equipment or on adjacent waste piles, this layer of ‘fall off’ waste plus any other dust and debris will help spread the fire across the building with surprising speed. In a sprinklered MRF building, the common


approach to protecting the shielded spaces beneath conveyors and equipment platforms is to install low level automatic sprinklers. For large MRFs with substantial shielded areas, the low level sprinklers will need to be fed off their own valveset on a separate sprinkler alarm zone. For unsprinklered buildings, most often these


spaces are left unprotected and reliance falls on a strong cleaning regime. However, for areas that are too difficult to keep clean, consideration should be given to localised waterspray or watermist fire suppression systems if they are already being installed for the waste bunkers. This means the investment is already being made in the fire pumps and tank, and adding more low level pipework would be relatively straightforward.


Electrical panels


Electrical panels come in all shapes and sizes. They also come in a wide range of criticality, and it is fair to say that the size of a panel does not necessarily reveal its criticality. As with all key equipment, it is wise to conduct a business impact analysis panel by panel across each site to identify the panels that


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www.frmjournal.com NOVEMBER 2018


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