Tank Roof Collapse Challenge One of Envent’s national customers contacted an Envent branch location regarding the need for a copy of Envent’s tank degas procedure “ As soon as you can. ” The customer indicated that a serious incident had occurred a few days earlier at one of their local petroleum processing facilities. Envent sent the tank degas procedure. For the purposes of hazard communication, the customer sent a copy of the safety bulletin and urged Envent to share with all employees. The safety bulletin indicated a tank cleaning and degassing company had been contracted to degas and clean a Gasoline storage tank. During degas the contractor had experienced a series of several small explosions inside the facility tank. The explosions were described as sounding like someone knocking on

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