Improper isolation of a 1/4 turn ball valve leads to a reportable release of Chlorine

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Chlorine LOTO Release

A manual ΒΌ turn ball valve (#1) was the lead isolation valve in a Double Block and Bleed arrangement.  The valve handle was incorrectly secured using a run of pipe BELOW the valve.  As shown, the valve handle would swing down in order to OPEN the valve.  With the chain securing the valve on the...

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