EagleBurgmann international
EagleBurgmann WORLDWIDE
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Products
API Plan 53C
API Plan 53C
Barrier fluid system pressurized by a piston accumulator supplying clean liquid for an arrangement 3 pressurized dual seal. The barrier pressure is generated from the seal chamber pressure. The system is self-energizing and reacts to fluctuations in the seal chamber fluid pressure.
A Cooler
B Piston accumulator
C Pressure reference
D Drain
E Vent
Seal chamber details
3 Pressure reference
4 Flush (F)
5 Liquid barrier OUT (LBO)
6 Liquid barrier IN (LBI)
7 Seal chamber
Example seal: EagleBurgmann MBS682-PTA dual metal bellows mechanical seal.
P&ID according to API
Key
1 Make-up barrier liquid
2 Piston accumulator
5 Liquid barrier OUT (LBO)
6 Liquid barrier IN (LBI)
8 Vent
9 Barrier fluid drain
LI Level indicator
LT Level transmitter
PRV Pressure relief valve*
PDIT Differential pressure transmitter with local indicator
TI Temperature indicator*
* If specified
** Vertically oriented, finned air cooler may be provided if specified
Features
- A piston accumulator dynamically adjusts the barrier pressure which is based on the seal chamber pressure, thus maintaining a fixed, steady differential pressure across the inboard seal faces.
- Barrier liquid enters the process medium through the inner seal faces.
- Uses the seal chamber pressure as a reference pressure and accordingly magnifies the barrier pressure by a pre-defined ratio.
- Highly reliable since there is no need for an external pressure source.
- Heat is removed with the help of a water cooler or an air cooler.
- Uses an internal circulating device to ensure barrier liquid circulation.
Application
- 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 a permanent, reliable nitrogen supply.
- Ideal plan for applications with varying seal chamber pressures. Pressure ratio depending on stuffing box pressure range:
- 4 bar (58 PSI) ... <10 bar (145 PSI) = piston ratio 1:1.5
- 10 bar (145 PSI) ... <22 bar (319 PSI) = piston ratio 1:1.2
- 22 bar (319 PSI) ... 40 bar (580 PSI) = piston ratio 1:1.1;
For stuffing box pressures less than 4 bar (58 PSI) or above 40 bar (580 PSI) consult EagleBurgmann.
- Check with the process engineer if product contamination is acceptable.
Remarks, checkpoints
- Check barrier fluid compatibility with the media.
- Vent the system before start-up. Later ensure that the vent line always remains closed.
- Sense the seal inlet and outlet line temperatures. Difference in the temperatures is an indication of proper flow.
- Ensure that the barrier pressure is always higher than the seal chamber pressure by at least 1.4 bar (20 PSI) (for piston ratio selection).
- Since there is less barrier fluid volume in the accumulator, heat dissipation is very much a function of the cooler efficiency.
- Ensure that the seal chamber reference line is not choked and that it is connected to the downstream of the accumulator.
- Ensure proper heating or cooling of the reference pressure line if necessary.
- Check the compatibility of the accumulator materials with the pump media.
Pump media characteristics
- Non-polymerizing and clean media
- Poor lubrication properties
- Hazardous / environmentally harmful
- Close to vaporization point
- Can tolerate dilution with barrier media
Location, function
- Between seals
- Barrier system (psealchamber < pbetweenseals)
- Lubrication, flushing and cooling for both inboard as well as outboard seals
Configurations
3CW-FB, 3CW-BB, 3CW-FF
Contact us
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The Eagleburgmann Group
Sealing technology for plants and machines
EagleBurgmann is one of the worldwide leading providers of industrial sealing technology. Mechanical seals, seal supply systems, magnetic couplings, carbon floating ring seals, expansion joints, gaskets and packings as well as comprehensive services are used wherever reliability and safety are needed.
Mechanical seals and more
Sealing technology by EagleBurgmann is used worldwide in oil and gas industries, refineries, the petrochemical, chemical, and pharmaceutical industries, food processing, energy, water, mining, paper, aerospace, and other industries. Close to 5,800 employees provide their ideas, solutions, and commitment so that customers can rely on our sealing technology.
What makes us stand out is our excellent quality, great innovative capacity, and an extensive product portfolio for nearly all industrial processes and fields of application. Our product portfolio includes everything from mechanical seals and seal supply systems to magnetic couplings, carbon floating ring seals, expansion joints, and gaskets and packings as well as comprehensive services. Since we are part of the German Freudenberg and Japanese EKK group, we have all the necessary resources for a firmly based reliable partnership.