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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Contribute to the surviving victims of Bhopal by buying my book "Practical Process Safety Management"
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