Drawing Toluene into an Ungrounded Bucket
This case study investigates the factors resulting in an electrostatic ignition incident involving toluene, a prolific charge generator filling a metal bucket via gravity fed 0.75” metal piping. In this scenario, an operator opened a valve to draw toluene into a metal bucket with toluene from an overhead tank by gravity flow at approximately 5 gallons per minute. The operator hung a metal bucket with a wire bail and plastic handle over a globe valve. The plastic handle on the bail isolated the metal bucket from ground. On opening the valve, the operator backed away from the bucket allowing the toluene to flow as he had previously done several times but within a few moments the toluene had ignited.
Download Full Article (Approximate reading time 5 mins)