Description:
Pressurised external barrier fluid circulation from a central pressure source or by a stand alone pumping unit (e.g. AESSEAL® PUMPPAC™).
Features:
- Ensures higher flow rate, better heat dissipation and positive circulation of barrier fluid.
- If maintained properly, is the most reliable pressurised plan for dual seals as compared to Plan 53 A/B/C.
- Can also be given as a stand alone unit per pump.
- Increases cooler efficiency due to higher flow rate the heat exchanger.
Uses:
- Applications where no leakage to atmosphere can be tolerated e.g. hazardous, toxic, inflammable.
- For dirty, abrasives or polymerizing products where media is unsuitable as a lubricant for inboard seal faces.
- For media with high pressure and / or high temperature and / or high heat generation between faces.
- Wherever Plan 53 A/B/C circulation is insufficient to dissipate heat.
Caution:
- Carefully consider the reliability of barrier fluid source, if a central source is used.
- Expensive system, proper engineering required.
- Circulating system must be pressurised at least 1.5 bar greater that the pressure in the seal chamber.
- Product contamination does occur. Barrier fluid selected should be compatible with the process fluid.
- Always check filter / strainer in the system for any possible blockages.
- Loss of pressure in system can lead to entire barrier liquid contamination.
- Product quality can deteriorate due to barrier fluid contamination.
