Ball valve wrongly fixed causes an incident

A propane gas release took place during the opening of a flange on the downstream side of a ball valve on a propane pipeline.The ball valve was installed in the wrong direction, so that the cavity vent released the flow to the down stream side rather than to upstream side as intended. The incident occurred when vapor was released when the flange bolts on the downstream side of the ball valve were loosened. Personnel arrested and stopped the release of propane vapor after tightening the flange with full bunker gear and self contained breathing apparatus.

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