EagleBurgmann international
EagleBurgmann WORLDWIDE
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Products
API Plan 54
API Plan 54
Pressurized external barrier fluid system supplying clean liquid for an arrangement 3 pressurized dual seal. The barrier liquid is maintained at a pressure greater than seal chamber pressure and is circulated by an external pump or pressure system.
A From external source
B To external source
Seal chamber details
1 From external source
2 To external source
3 Flush (F)
4 Liquid barrier OUT (LBO)
5 Liquid barrier IN (LBI)
6 Seal chamber
Example seal: EagleBurgmann H75A4-B dual pusher mechanical seal.
P&ID according to API
Key
1 From external source
2 To external source
Features
- Most reliable of all dual pressurized plans when properly engineered.
- Provides barrier liquid circulation and cooling even though the process pump is in stand-by mode.
- The pumped fluid becomes contaminated but never leaks to the atmosphere unless the system pressure is lost.
- Ensures positive barrier fluid circulation and better heat dissipation due to higher flow rates as compared to 53A, 53B or 53C. Heat is removed with the help of a water cooler or an air cooler.
- Uses a pump to ensure barrier liquid circulation and pressurization.
- May employ a nitrogen / inert gas blanket for barrier oil applications.
Application
- Applications which require higher heat dissipation, which limits the use of Plans 53A, 53B, or 53C.
- For services where product dilution is acceptable.
- For services where media is unsuitable for flushing the inner seal faces.
- For services where Plan 53A cannot be used due to non-availability of central pressure source.
- For applications with high pressure and/or high temperature or where an internal circulating device would not lead to effective circulation.
- Where a single system is utilized for multiple seals.
Remarks, checkpoints
- Check with the process engineer if product contamination is acceptable.
- Check barrier fluid compatibility with the media.
- In case the system has a strainer or a filter, check for blockages.
- Note that the loss of pressure in the system may cause the pumped media to enter the entire Plan 54 system.
- Ensure that the barrier pressure is always higher than the seal chamber pressure by at least 1.4 bar (20 PSI).
- Plan 54 systems need careful engineering based on the application.
Pump media characteristics
- Suspended solids
- Polymerizing and contaminated media
- Poor lubrication properties
- Hot services
- Hazardous / environmentally harmful
- Leakage may form solids
- Close to vaporization point
- Can tolerate dilution with barrier media
Location, function
- Between seals
- Barrier system (psealchamber < pbetweenseals)
- Lubrication and flushing for the outboard seal and cooling for inboard as well as outboard seals.
Configurations
3CW-FB, 3CW-BB, 3CW-FF
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