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Positive Isolation: Isolation of process piping, equipment or vessels from hazardous materials (vapors, liquids, or
solids) such that it is impossible for hazardous materials to enter the work area.
Single Valve Isolation: Most common valves provide only one sealing surface to isolate upstream pressure and
fluids. Common valves styles include floating ball valves, trunnion mounted ball valves and gate valves. Pressure
relief and safety valves (PSV) are also included in this category when used as a single point of isolation.
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