Maintenance
(continued)
19
Vacuum Break
•
Cleaning: Disconnect ozone delivery lines. Remove the vacuum break from mounting clamps. Disconnect the
overflow tube from flapper valve, open flapper and clean the seat with a soft cloth. Remove riser tube threaded
fitting and flush riser tube with water. Re-assemble and re-install vacuum break, making sure to add water to
correct level (see Figure 6-3).
Injector Manifold
•
Check Valve: Replace the check valve located at the ozone injection manifold.
Note:
Because the system is in
the shutdown mode, no vacuum is present at the injector. Therefore, it is normal for some water to be
flowing from the injector during this procedure.
Contact Vessel
•
Cleaning: Contact Column only. Inspect the diffuser slots at the top of the contact column riser tube. If they are
clear, no further maintenance is required. If the slots are fouled, disassemble the column and clean as required,
following the steps outlined below (see Figure 4-4).
Step 1:
Make sure the isolation valves before and after the contact column are closed.
Step 2:
Disconnect the vent line from the top of the contact column.
Step 3:
Remove the bolts in the 6” base flange.
Step 4:
Remove the column, lifting it over the interior riser tube.
Step 5:
Remove and clean the diffuser.
Step 6:
Inspect the flange gasket and replace if necessary.
Step 7:
Reassemble the contact column and attach vent lines.
