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Reservoir providing buffer liquid for the outer seal of an arrangement 2 unpressurized dual seal. The buffer liquid shall be maintained at a pressure less than seal chamber pressure and less than 2.8 bar (40 PSI).
A From mechanical seal
B To mechanical seal
C Filling connection
D Cooling water IN
E Cooling water OUT
F Drain
G Connection to flare
4 Flush (F)
5 Liquid buffer OUT (LBO)
6 Liquid buffer IN (LBI)
11 Seal chamber
Example seal: EagleBurgmann H75A4-T dual pusher mechanical seal.
Key
1 To collection system
2 Reservoir
3 Make-up buffer liquid
7 Cooling water IN
8 Reservoir buffer fluid drain
9 Cooling water OUT
10 Buffer fluid drain
LI Level indicator
LIT Level transmitter with local indicator
2CW-CW
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