9.1.5 Uncontrolled service pressure
Causes Corrective action
Pressure controller
out of adjustment.
Adjust the controller's service
pressure. Adjust the operating
pressure on the controller by
lifting the red locking ring of
the controller and turning the
knurled knob clockwise to
increase the internal pressure
in the tank or anticlockwise to
reduce it.
Note that there is a long
period of inertia, lasting about
a minute, between the
adjustment and a change in
the pressure gauge reading.
Figure 9-2: Red locking ring on the controller.
9.2 Preventive maintenance
Inspection of the components Frequency (*)
Pressure gauge Annual
Valves Annual
Level indicator Annual
Airtight seal Annual
Leaks Annual
(*)The frequencies shown are guideline intervals and should be
adjusted by the user according to the use made of the tank.
9.3 Inspections
9.3.1 Inspecting the pressure gauge
The equipment needed is as follows:
A calibrated manometer to be used as a reference.
A flexible line.
Proceed as follows:
1. Close the vent valve (2). Close the
filling/withdrawal valve (1). Close the pressure-
building valve (3).
2. Connect the calibrated manometer (5) to the vent
connection (2) with a flexible line.
3. Connect a pressure source (oil-free dry air) (6) that
can be varied between 0 and 0.5 bar to the fill
connector (4).
4. Open the withdrawal valve (1) gradually in order
to increase pressure in the tank to a given value.
Do not increase pressure past the normal
tolerated pressure (see technical
specifications on page 34).
5. Open the vent valve (2) and compare the
readings on the two pressure gauges (5 and
7). You can measure a number of different
points between 0 and 0.5 bars.
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