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In Piping Plan 65A there is an atmospheric leakage collection and detection system for condensing leakage. Failure of the seal will be detected by an excessive flow rate into the leakage collection system.
This plan is used when pumped fluid condenses at ambient temperatures.
Piping Plan 65A 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 past or through a reservoir and then through na orifice, exiting into an oil and water sewer or liquid collection system. Excessive flow rates would be restricted by the orifice located downstream of the reservoir and are redirected to it, causing the level transmitter to activate an alarm. The orifice, typically 5 mm (0.25 in.), should be located in a vertical piping leg to avoid accumulation of fluid in the drain piping. A connection on the reservoir above the level transmitter is connected to a pipe bypassing the orifice allowing excessive leakage to be effectively drained. A pressure transmitter can be provided as an option to allow for monitoring pressure increase in the system.
Piping Plan 65A 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.