Atmospheric leakage collection and detection system for condensing leakage. Seal failure is detected by an excessive flow rate into the leakage collection system.
![API Plan 65A](/wp-content/uploads/API_Plan-65A.png)
Description
This is an atmospheric loss recovery plan requiring a detection and collection system for condensing leakage. Seal failure is determined by recording an excessive flow into the collection system.
Application Notes
- Normally used with Arrangement 1 seals in services where seal leakage is expected to be mostly liquid.
- Leakage is directed from the drain connection in the seal gland past or through a reservoir and then through an orifice, exiting into a liquid collection system.
- Valve below the gland must always remain open during pump operation to allow leakage to flow to the reservoir.
- The orifice, typically 0.20 in. [5 mm], should be located in a vertical piping leg to avoid accumulation of fluid in the drain piping.
- If flow rates are too high, the orifice will restrict the flow and the level transmitter will trigger an alarm.
- Reservoir typically includes a level transmitter and a local level indicator to monitor conditions.
- Reservoir must be mounted below the seal gland to allow leakage to readily flow to the reservoir.
- Provides an indication of excessive seal leakage and seal failure without manual inspection.
Pros:
- Easy detection of seal failure by measuring leakage levels
- Low cost
Cons:
- Low leakage rates might not trigger alarms despite seal damage
- High leakage rates may result in process fluid escape to environment