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Providing there is still established flow, cutting heads are introduced to remove all material which can be easily pulverised and made to flow, including under the roof and walls down to the cone area. This would expose hardened build up which is then pulverised to a size which can be removed via the valve. Depending on the product and silo layout, air spearing may be necessary to break up lumps even further, in order to ensure continuous flow of the product. The layout of most silos incorporates entry points or hatches at cone level. Therefore, where lumping in the cone is too difficult to remove through the valve, the silo is made safe for human entry via the hatch, with no product on the underside of the roof or walls above the entrants. Manual cleaning can then safely take place, followed by air-slide inspection or any other required work.
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