EagleBurgmann international
EagleBurgmann WORLDWIDE
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Products
API Plan 53B
API Plan 53B
Barrier fluid system pressurized by a bladder accumulator supplying clean liquid for an arrangement 3 pressurized dual seal.
A Cooler
B Bladder accumulator
C Drain
D Vent
Seal chamber details
4 Flush (F)
5 Liquid barrier OUT (LBO)
6 Liquid barrier IN (LBI)
7 Seal chamber
Example seal: EagleBurgmann H75A4-T dual pusher mechanical seal.
P&ID according to API
Key
1 Make-up barrier liquid
2 Bladder accumulator
3 Bladder charge connection
8 Vent
9 Barrier fluid drain
10 Valve* (for checking accumulator bladder integrity)
PI Pressure indicator*
PIT Pressure transmitter with local indicator
TI Temperature indicator**
TIT Temperature transmitter local indicator
* If specified, both the PI and valve 10 shall be installed for checking bladder integrity.
** If specified.
*** Vertically oriented, finned air cooler shall be installed if specified
Features
- The barrier fluid and nitrogen are separated by a bladder which effectively prevents the nitrogen from mixing with the barrier fluid as in the case of a Plan 53A.
- The pumped medium generally does not leak to the atmosphere unless the bladder pressure is lost.
- High reliability as a stand-alone system without need for a permanent nitrogen source and external pressure.
- Heat removal by water or air cooler.
- Uses an internal circulating device to ensure barrier liquid circulation.
- Barrier liquid enters the process medium through the inner seal faces.
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 at required pressure.
- For applications with barrier pressures above 16 bar (232 PSI) where Plan 53A cannot be used.
Remarks, checkpoints
- Check with the process engineer if product contamination is acceptable.
- Check barrier fluid compatibility with the media.
- Always pre-charge the bladder at the correct pressure to ensure the required barrier pressure at the operating temperature. Refer to the nameplate affixed to the accumulator.
- 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).
- Since there is less barrier fluid volume in the accumulator, heat dissipation is a function of the cooler efficiency.
Pump media characteristics
- Suspended solids
- Polymerizing and contaminated media
- Poor lubrication properties
- 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, flushing and cooling for both inboard as well as outboard seals.
Configurations
3CW-FB, 3CW-BB, 3CW-FF
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