Standards - Open-ended valves or lines

1. Requirements. a. Each open-ended valve or line must be equipped with a cap, blind flange, plug, or a second valve. b. The cap, blind flange, plug, or second valve must seal the open end at all times except during operations requiring hazardous secondary material stream flow through the open- ended valve or line. 2. Each open-ended valve or line equipped with a second valve must be operated in a manner such that the valve on the hazardous secondary material stream end is closed before the second valve is closed. 3. When a double block and bleed system is being used, the bleed valve or line may remain open during operations that require venting the line between the block valves but must comply with subsection 1 at all other times.