Api Plan 74
Externally supplied barrier gas for arrangement 3 dual pressurized non-contacting gas seals.
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- 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.
- 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.
- 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.
