Replacing The Drum Seal - Pentair PR AQUA ROTOFILTER Installation And Operation Manual

SECTION 12: DRUM SEAL MAINTENANCE

12.3 Replacing the Drum Seal

Follow this procedure only after completing the
previous section.
12.3.1 Tools
Socket wrench
SAE socket set
Anti-seizing compound
Utility knife
Clean cloth
12.3.2 Procedure
Always follow the proper shutdown procedure
(Section 8.2 or 8.3) before performing any
maintenance on the Rotofilter.
1. Clean the outer seal ring by wiping it with a
clean cloth.
2. Inspect and clean the inlet trunnion before
installing the new seal. Apply anti-seizing
compound to the rivet nuts that will be used to
install the seal.
3. Pre-assemble the new drum seal to the outer ring
by inserting all fasteners halfway through the ring
and drum seal. See Figure 51.
Figure 51. Drum seal pre-assembly
4. Align the seal assembly fasteners with the
corresponding rivet nuts on the inlet plate,
while pushing the drum seal onto the inlet
trunnion to form the proper right-angle seal.
Start with the top-left bolt and thread it into
the rivet nut by hand-tightening. Work your
way around the seal ring until all fasteners are
threaded in and hand-tight.
5. Ensure the seal is positioned on the inside of
the drum trunnion and makes contact all the
way around. Realign the seal if necessary.
See Figure 52.
Figure 52. Incorrect (left) and correct (right)
drum seal alignment
6. Starting at the top-left bolt, torque all bolts until
the seal compresses between the outer seal rim
and inlet plate by 0.32 centimeters (0.125 inches).
7. The seal may have excess material, either being
too wide or too long. Trim excess material
from the drum seal using the inside of the inlet
trunnion as a guide, See Figure 53.
Figure 53. Trimming the drum seal using
the inlet trunnion
PR Aqua Rotofilter™ Drum Filter Installation and Operation Manual
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