Flowserve 682 Seal Cooler - Manual (Page 6)

6
1.2 Vertical or Horizontal Mounting
Even though the 682 Seal Cooler can provide cooling capabilities when it
is mounted horizontally, it is much more advantageous to mount this seal
cooler vertically. In a vertical position, the cooling coil tubing winds gradu-
ally downward and upward for optimum fluid drainage and gas/air venting.
In a horizontal position, it is much more difficult to totally drain both the
sealing and cooling fluids. The sealing fluid becomes trapped within the
lower turns of the cooling coil and the shell side cooling water becomes
trapped below the lowest drainage point. The seal cooler would need to
be removed and positioned vertically to achieve total drainage. It is also
much more difficult to vent gas/air from a horizontal installation because
the gas/air can become trapped within the upper turns of the cooling coil.
A series of flush and bleed steps might be necessary in order to remove
these trapped gases.
The presence of trapped gas/air is more critical when using a Plan 23
seal flush. Trapped gases that become entrained in the sealing fluid can
reduce the seal cooler efficiency and flow in the seal flush circuit. This can
ultimately cause the seal to overheat and fail due to a lack of lubrication. A
vertically mounted seal cooler provides the advantage of a thermosyphon
effect which is lacking with horizontal installations to help alleviate these
potentially detrimental conditions.
tube side
gas vents
shell side
gas vents
(in cover)
cooling
water
drains
(in cover)
tube side
fluid drains
Horizontal
Vertical
trapped gas
in tubing
trapped gas
in shell
tube side
gas vent
tube
side fluid
drains