7.3.1.2 Checking The Opening Pressure; High Pressure Gaskets; Overhaul; Leak Test Of High Pressure And Medium Pressure Components - MSA AUER BD 96 mini Manual De Usuario

Attention!
The plastic part in the whistle tube has an elevation on
its edge which matches the dip on the whistle type.
Assure proper alignment. If the parts are twisted against
each other, the sound of the whistle is impaired. Tighten
holding nut by hand.

7.3.1.2 Checking the Opening Pressure

• Open cylinder valve. The cylinder pressure should be
approx. 30 bar higher than the desired opening pressure.
• Close cylinder valve again.
• Carefully use the flushing mode of the lung governed
demand valve until air is released. During this, observe
the pressure gauge; the warning signal must sound at the
desired pressure (factory set at 105 ± 5 bar).
7.3.2

High Pressure Gaskets

Check condition of rubber ring gaskets on cylinder connec-
tion (visual check) (Fig. 33). Replace if damaged or after 12
months
33
7.3.3

Overhaul

A complete overhaul is required every six years. It can be
done only by the manufacturer or by authorized service
centers. During the overhaul all rubber parts and compo-
nents subject to wear and tear are replaced. Following this
the system is newly adjusted and lead sealed.
Note:
The pressure reducers of the MSA AUER compressed air
breathing apparatus are fitted with a seal cap. Removing the
cap will destroy the seal.
Attention!
Pressure reducers of approved apparatus must be lead-
sealed. With apparatus where the original AUER lead
seals are open or missing, it is no longer assured that
they are suited for use, resp. are still in an approved
condition.
MSA AUER can only be responsible for properly
performed maintenance and thus full readiness for use
if the pressure reducers have been maintained and
again lead-sealed by MSA AUER or an authorized
service center. This is the case only if the pressure
reducers have original AUER lead seals.
7.4 Leak Test of High Pressure and
Medium Pressure Components
• Open cylinder valve. The cylinder pressure must be at
least 270 bar at 300 bar cylinders and at least 180 bar at
200 bar cylinders.
• Close cylinder valve. After two minutes the pressure drop
must not exceed 10 bar.
22
7.5

Compressed Air Cylinders

7.5.1

Charging

The compressed air cylinders may only be charged with
breathable air according to EN 12021.
After charged cylinders have cooled down to ambient
temperature, check the pressure to assure that maximum
operating pressure is maintained. If necessary, recharge the
cylinders.
In Germany, compressed air cylinders may be charged only
under the following conditions:
• The cylinders must be in accordance with German
Standard DIN 3171 and the valves with EN 144.
• The cylinders must show the last inspection date, the
sign of the inspecting authority (e.g. TUEV), and the
inspection interval.
• The inspection interval marked on the cylinder must not
be exceeded.
• The cylinder must not have defects that could cause a
risk (e.g. defective valve).
• There must be no humidity in the connecting thread.
Completely empty (pressureless) compressed air
cylinders must be dried.
This is required to prevent excess moisture inside the
cylinder.
One method of drying is to charge the cylinders twice fully
(up to maximum permissible charging pressure) with dry air
from a compressor and afterwards releasing the air again.
At discharging the valve may not freeze.
7.5.2

Use

During transport and storage compressed air cylinders
must be shock-protected.
To prevent excess moisture in the breathable air inside the
compressed air cylinder, the following must be observed:
• Compressed air cylinders should not be totally dischar-
ged (pressureless).
• Close cylinder valves immediately after use of the com-
pressed air breathing apparatus.
• Close cylinder valves with stoppers immediately after
disconnecting the cylinders.
• Close cylinder valves with stoppers immediately after
charging.
• Afterwards, if required, fix lead seal.
7.5.3 Transport and Storage of Unconnected
Cylinders
If possible, compressed air cylinders should be transported
vertically with the valve upwards.
When moving the cylinders by hand, if possible, both hands
should be used, whereby on the valve end, the valve
housing and not the handwheel should be grasped.
For storage, cylinders must be secured from tilting, falling
down, resp. from changing their position.
7.5.4

Visual Check of Valve

Check valve for damage, e.g.:
• damaged valve housing
• damaged handwheel
• canted valve housing
• canted valve spindle
(noticeable by canted handwheel).