EagleBurgmann international
EagleBurgmann WORLDWIDE
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Products
API Plan 72
API Plan 72
Externally supplied buffer gas for arrangement 2 unpressurized seals with a dry running containment seal. Buffer gas is maintained at a pressure less than seal chamber pressure.
A Gas OUT
B Gas IN
Seal chamber details
2 Flush (F)
3 Containment seal vent (CSV)
4 Containment seal drain (CSD)
5 Gas buffer inlet (GBI)
6 Seal chamber
Example seal: EagleBurgmann H75LG4-C dual pusher mechanical seal.
P&ID according to API
Key
1 Buffer gas panel
3 Containment seal vent (CSV)
4 Containment seal drain (CSD)
7 From buffer gas supply
FIL Coalescing filter
FIT Flow transmitter with local indicator
PCV Pressure control valve
PIT Pressure transmitter with local indicator
Features
- Is used together with Plan 75 (for condensing leakage) or Plan 76 (for vaporizing leakage).
- The buffer gas is usually nitrogen and acts as a supply medium for the outboard seal and as a sweeping medium for leakages from the inboard seal.
- Nitrogen blanket reduces the explosion hazard arising out of leakages from the inboard seal as well as prevents icing in cryogenic applications.
Application
- May be used for flashing as well as non-flashing services.
Remarks, checkpoints
- Always ensure that the buffer gas pressure is less than the seal chamber pressure.
- Set the forward pressure regulator to min 0.4 bar (5 PSI) above the normal flare pressure.
- The buffer gas pressure should not exceed 0.7 bar (10 PSI).
- Ensure that the CSV port is oriented to the 12 o'clock position and CSD to the 6 o'clock position.
Pump media characteristics
- Hazardous / environmentally harmful
- High vapor pressure fluids
- Clean non-polymerizing fluids
- Fluids condensing or vaporizing at ambient temperatures.
Location, function
- Between seals
- Buffer system (psealchamber > pbetweenseals)
Configurations
2CW-CS, 2NC-CS
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