API Plan 75
Leakage of condensate from inboard seal of a dual containment seal is directed to a liquid collector.
- Can be used with Plan 72 with buffer gas or with Plan 71 without buffer gas systems.
- Collection can be redirected to process fluid by using separate pumping device.
- Can be used in single containment seal also.
- Test connection is provided to check the inner seal by closing the block isolation valve while pump is in operation and noting the time / pressure build-up relationship in the collector.
- Duties with condensing leakages.
- Hazardous, toxic fluids.
- May also be used for non-condensing leakages. In such cases, the collector can help in collecting condensate from the vapor recovery system.
- Ensure that collection system is located below the seal drain with sloping pipelines.
- Drain port should be at bottom of containment seal to allow the leakage to flow to the collection system
- Collection system should always be vented releasing vapors of process liquid to vapor recovery system.
- Valves that are installed should be accessible to operator relative to ground clearance and other obstructions.
- A flow control orifice is required to create back pressure on collection system and to have effective condensation of vapors.
- Pressure switch should be set at a gauge pressure of 0.7 bar.
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