Air receiver blast

There was a blast during the cleaning of gas turbine in a polymers factory that makes cans, jars, etc. It is reported that the the valve of the gas turbine suddenly blew up that caused ripping of roof and fragments caused injury to a woman nearby. As per the news in a local news paper, due to malfunctioning of safety valve on the air receiver, the air receiver exploded. As Monday was holiday for the factory, it is reported that no injuries took place in the factory. It is luck that the person involved in the work is safe though the roof sheets blew off but did not fall on him. It is not known what precautions were taken before taking up the cleaning job, like, i) emptying the vessel and purging with inert gas and then purging with air, ii) positive isolation of all lines leading to and from the tank, iii) checking for presence of flammable concentrations in the tank, iv) checking for oxygen level, v) job hazard analysis, vi) supervision and so on.

As the work was taken up on factory holiday and incident happened, one should be careful when planning such maintenance jobs on holidays it should be ensured that safety work permit is obtained and supervision is provided.