THRUSH AAR-O-VENT TASF - Thrush Aar-O-Vent Maintenance Procedures; Aar-O-Vent Routine Maintenance Guide

Copyright © 2014 by Thrush Co Inc
Section 5
Maintenance Information
5.1 Maintenance Information
The Aar-O-Vent’s simple design allows for minimal maintenance. There are no moving
parts other than the air elimination device itself.
• Routine flushing of the blow down valve and skim valve are recommended.
Frequency of flushing is system specific based on water quality. A container or
hose should be used to catch the sediment when flushing the valves, unless they
are piped to an adequate drain.
System water over 100°F can be very hazardous. Keep flow away from the body
when flushing the unit. Failure to do so could result in serious bodily injury or
property damage.
• The coalescing medium (bundle) can be removed for cleaning as needed. A
power washer or hose is sufficient. The stainless steel construction allows for
ease of cleaning. A new gasket should be installed upon reassembly of the unit.
Tighten all bolts in a criss-cross fashion, properly torqued. See chart below.
Depending on the size of Aar-O-Vent, the head and bundle can be quite heavy. It is
recommended that supports be used when removing the head/bundle. Once all
bolts have been removed from the head, the head and bundle are free to drop.
Risk of severe personal injury and/or property damage may occur if the bundle
and head are not properly supported.
• When replacing the gaskets and reassembling the unit, the bolts should be
torqued incrementally to 30%, 60% and then 100% of the appropriate value
shown in the chart below. They should also be torqued in a criss-cross pattern.
Aar-O-Vent
Connection size
Removable
Head Size
Bolt Size Number of Bolts
Torque Ft/Lb
(150# Flgs.)
2”
6”
3/4”
8
50
2.5”
6”
3/4”
8
50
3”
6”
3/4”
8
50
4”
8”
3/4”
8
50
5”
10”
7/8”
12
80
6”
12”
7/8”
12
80
8”
16”
1”
16
123
10”
20”
1 1/8”
20
195
12”
24”
1 1/4”
20
273
Thrush Co.
Manual #9636
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1230