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In Piping Plan 65B there is an atmospheric leakage collection and detection system for condensing leakage. Failure of the seal will be detected by a cumulative leakage into the system. This plan is used when pumped fluid condenses at ambient temperatures.
Piping Plan 65B is a seal leakage detection piping plan normally used with Arrangement 1 seals in services where seal leakage is expected to be mostly liquid (not gas). Piping is connected to the drain connection in the gland plate and directs any seal leakage into a reservoir resulting in an increase in level of process fluid in the reservoir. The level increases will be monitored by the level transmitter and will activate an alarm. A connection on the reservoir above the transmitter is connected to a pipe bypassing the valve allowing excessive leakage to be effectively drained.
Piping Plan 65B is most effective when used with a floating or segmented bushing or containment device in the seal gland. The reservoir shall be mounted below the seal gland to allow leakage to flow to the reservoir.
Valve shall be left open during operation and may be closed only for maintenance of the piping plan.
Second valve shall normally be closed during operation although it may be opened periodically to allow collected leakage to be drained.