Flowserve Dual Gas Barrier Seals - Manual (Page 11)

11
Dual Gas Barrier Seals - Installation and Mintenance Instructions for Machinery Components
7. Piping Recommendations
The Dual Gas Barrier Seal is designed to be run in a normally dry running
mode with a pressurized clean inert gas (nitrogen) or air between the two
seals.
The gland is equipped with a gas barrier inlet and a drain connection.
7.1 Vent out the gas barrier line prior to connecting to the seal gland to ensure
that foreign material has not collected in the piping.
7.2 Connect gas barrier Plan 74 shown in Figure 8 to the barrier inlet port (refer
to Figure 5). The pressure gage and regulator are required to set the barrier
gas pressure 25 to 50 psig (2 to 4 bar) higher than that of the product being
sealed (seal chamber pressure).
NOTE: It is important that the pressure gage and the low pressure alarm be
installed close to the gland port for accurate values.
An optional control panel that incorporates all the equipment in a plan 74 for a
Dual Gas Barrier Seal is available from Flowserve.
7. Plug the drain port, (refer to Figure 5), or connect to a block valve.
Plan 74 for Dual Gas Barrier Seal Figure 8
seal
end view
drain
inlet
1
3
2
C
D
A
B
E
F
G
1 - upset drain, normally closed
2 - gas inlet, normally open
 - filter drain, normally closed
A - coalescing filter
B - regulator
C - flow indicator
D - flow switch (high)
E - pressure switch (low)
F - pressure indicator
G - check valve