EagleBurgmann international
EagleBurgmann WORLDWIDE
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Products
API Plan 74
API Plan 74
Externally supplied barrier gas for arrangement 3 dual pressurized non-contacting gas seals.
A Gas OUT
B Gas IN
Seal chamber details
2 Vent (if required)
3 Gas barrier inlet (GBI)
4 Gas barrier outlet (GBO) (normally closed), used only to depressurize barrier
5 Seal chamber
Example seal: EagleBurgmann CGSH-KD dual pusher mechanical seal.
P&ID according to API
Key
1 Barrier gas panel
3 Gas barrier inlet (GBI)
4 Gas barrier outlet (GBO) (normally closed), used only to depressurize barrier
6 From barrier gas supply
FIL Coalescing filter
FIT Flow transmitter with local indicator
PCV Pressure control valve
PIT Pressure transmitter with local indicator
Features
- Nitrogen is used as barrier gas.
- Pumped media never leaks to the atmosphere.
- High reliability due to the absence of foreign particles/solids in the barrier gas.
Application
- For dual pressurized non-contacting seals.
- For media with moderate temperatures, with poor lubrication properties or with hazardous or toxic nature.
- For services where media contamination is acceptable but no media leakage to atmosphere is tolerated.
- Flashing light hydrocarbons.
Remarks, checkpoints
- Check if nitrogen is compatible with the pumped media.
- Ensure that the barrier gas pressure is higher than the seal chamber pressure by at least 1.7 bar 25 PSI).
- Set the back pressure regulator at least 1.7 bar (25 PSI) above the seal chamber pressure.
- Check filter from time to time for any blockages.
- Do not use for polymerizing and sticky media as this creates problems with the inboard seal faces.
- Ensure a reliable nitrogen supply. Avoid usage of nitrogen gas bottles.
- Use individual gas panel per seal assembly in a between bearing pump.
Pump media characteristics
- Poor lubrication
- Clean, non-polymerizing moderate temperature fluids.
- Hazardous / environmentally harmful
- Close to vaporization point
- High vapor pressure media
Location, function
- Between seals
- Barrier system (psealchamber < pbetweenseals)
Configurations
3NC-FB, 3NC-BB, 3NC-FF
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