Legend
- 1. buffer gas panel
- 2. flush (F)
- 3. containment seal vent (CSV)
- 4. containment seal drain (CSD)
- 5. buffer gas inlet (GBI)
- 6. mechanical seal chamber
- 7. from buffer gas supply
- FIL. coalescing filter
- FIT. flow transmitter with local indicator
- PCV. pressure control valve
- PIT. pressure transmitter with local indicator
Low pressure installation for outer seal containment. Buffer (quenching) gas is fed externally to the outer seal of the double system. Buffer (quenching) gas may be used only to dilute seal leakage or in conjunction with Plan 75 or 76 to help sweep gas vapours leakage into a closed collection system (discharge system) or liquid leakage to the tank. The system enables leakage monitoring. Pressure of the buffer (quenching) gas is lower than process pressure (at the technological process side) of the inner seal.
