date:Aug 17, 2012
litres of water and was used to produce hot water for washing the dairy.
The HSE investigation revealed that maintenance engineers at the plant had been manually controlling the steam supply valve to the calorifier after the automatic control broke.
But the vent pipe on the tank, which should have allowed water to escape if it became too hot, had become completely blocked. The blockage was caused by a layer of calcium carbonate, which had accumulated possibly over several years.
The blockage