CEN-PAQ
1
1. INTRODUCTION
1.1 IMPORTANT
CEN-PAQ must be serviced in
accordance with the Servicing Schedule
on at least an annual basis. Please refer
to notes under Servicing.
These instructions for the use, care and
maintenance of the apparatus must be
followed to ensure the correct and safe
operation of CEN-PAQ.
For any enquiries regarding the use of
SCOTT breathing apparatus, please
contact Training & Technical Support
Services at Scott Health and Safety
Limited.
1.2 BREATHABLE AIR
Air used to supply or charge breathing air
may be natural or synthetic. The
composition of breathable air is given in
Table 1.
COMPONENT
MASS %
(Dry Air)
VOLUME %
(Dry Air)
OXYGEN 23.14 20.948
NITROGEN 75.52 78.08
ARGON 1.29 0.93
CARBON
DIOXIDE
0.05 0.031 4
HYDROGEN 0.000 003 0.000 05
NEON 0.001 270 0.001 818
HELIUM 0.000 037 0.000 524
KRYPTON 0.000 330 0.000 114
XENON 0.000 039 0.000 009
Table 1: Breathable Air
There is an increased fire risk when the
oxygen content is above the value shown
above.
The purity/quality of air used to supply
and charge breathing apparatus should
be tested periodically in accordance with
national regulations.
Unless specified otherwise, the
contaminants shall not exceed the
permissible exposure level.
National regulations must be observed.
The mineral oil content shall be such that
the air is without the odour of oil. The
odour threshold is in the region of 0.3
mg/m
3
.
The water content shall not exceed 50
mg/m
3
for 200 bar apparatus and 30
mg/m
3
for 300 bar apparatus.
For airline apparatus, air must be used
with a dew-point sufficiently low to
prevent internal freezing.
1.3 COMPRESSED AIR
AIRLINE SUPPLIES
Air for use with compressed air airlines
must conform to prEN 12021 : 1995 and
must have a dew point sufficiently low to
prevent internal freezing when apparatus
is used in temperatures below 4°C.
No. of Wearers Airflow (L/min.)
1
2
3
4
300
450
750
900
Table 2
Airline pressure must be between 5.0 -
9.0 bar (70 - 130psi). Airflow supply
capacity for a single airline is given in
Table 2.
Generally, each additional wearer
requires an extra 150 litres/minute, each
additional pair of wearers requires 300
L/min for one wearer and 450 L/min for
two wearers. All measurements must be
taken at the wearer end of the airline.
Example: for 8 users (4 pairs) the
recommended flow is 4 x (300 + 150) =
1800 litres/minute.
An Airline Flow Tester is available from
Scott Health and Safety Limited under
Article Number 1035978.
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