S.C. Code Regs. 61-79.261.BB.1056 - Standards: Open-ended valves or lines
(a)
(1)
Each open-ended valve or line shall be equipped with a cap, blind flange, plug,
or a second valve.
(2) The cap,
blind flange, plug, or second valve shall seal the open end at all times except
during operations requiring hazardous secondary material stream flow through
the open-ended valve or line.
(b) Each open-ended valve or line equipped
with a second valve shall be operated in a manner such that the valve on the
hazardous secondary material stream end is closed before the second valve is
closed.
(c) 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 shall
comply with paragraph (a) of this section at all other times.
Notes
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