Flexaseal 78HT, Installation, Operation, Maintenance Manual

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Installation, Operation, & Maintenance Guide
Style 78HT
Figure 8: Step
5
. Figure 9: Step
10
. Figure 10: Step
12
.
.050
DESIGN GAP
Figure 11: Style 78HT layout.
SEAL SUPPORT SYSTEM INSTALLATION
The following steps briefly describe the methods in which a buffer/barrier system should be piped and set up to
support a double cartridge seal. Consult Flexaseal for specific applications and details.
1 . Correctly make connections between the buffer/barrier fluid system and the mechanical seal according to
the connection labels on the prints. In the case of a Piping Plan 52 or Plan 53A the
SEAL SUPPLY
connection (lower port) on the reservoir must lead to the buffer/barrier fluid in (
BFI
) connection on the seal
gland; the
SEAL RETURN
connection (upper port) on the reservoir must lead to the buffer/barrier fluid out
(
BFO
) connection on the seal gland ( Figure 12 ).
• Piping should slope continuously upwards (
1
⁄
2
in./ft. [40 mm/m] minimum) with no relative high points
that would result in trapped air in the tubing.
• For shafts smaller than 2 1 ⁄
2
in. [64 mm] use at least 1 ⁄
2
in. diameter tubing and at least 3 ⁄
4
in. tubing for
larger shafts.
• Use smooth, long radius bends in the piping, minimize 90
◦
elbows, and use 45
◦
bends wherever
possible.
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