Introduction; Abbreviations; Breathable Air; Compressed Air Airline Supplies - Scott Pro-Pak User Instructions

1. INTRODUCTION

1.1

ABBREVIATIONS

The following abbreviations are used in
this manual:
AL Airline Attachment
BA Breathing Apparatus
CVR Cylinder Valve Retainer
DCC Decontamination Attachment
DV Demand Valve
HP High Pressure
IRIS Integrated
System
L/min Litres per Minute
m Metres
min Minutes
mg Milligrams
mm Millimetres
MP Medium Pressure
NRV Non Return Valve
PRV Pressure Relief Valve
psi Pounds per Square Inch
RSM Rescue Mask Attachment
1.2

BREATHABLE AIR

Air used to supply or charge breathing air
may be natural
composition of breathable air is given in
Table 1.
Component Mass %
(Dry Air)
Oxygen 23.14
Nitrogen 75.52
Argon 1.29
Carbon Dioxide 0.05
Hydrogen 0.000 003
Neon 0.001 270
Helium 0.000 037
Krypton 0.000 330
Xenon
0.000 039
Table 1: Breathable Air - EN 12021
(NOT applicable for Australia or New
Zealand)
There is an increased fire risk when the
oxygen content is above the value shown
above.
Radio Information
or synthetic. The
Volume%
(Dry Air)
20.948
78.08
0.93
0.031 4
0.000 05
0.001 818
0.000 524
0.000 114
0.000 009
The purity/quality of air used to supply
and charge breathing apparatus should
be tested periodically in accordance with
national regulations.
Unless otherwise
contaminants
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
3
mg/m .
The water content shall not exceed 50
3
mg/m for 200 and 207 bar apparatus and
3
30 mg/m 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 EN 12021 : 1999 or
AS/NZS1715 : 1994 and must have a
dew point sufficiently low to prevent
internal freezing when apparatus is used
in temperatures below 4°C.
No. of Wearers
1
2
3
4
Airline pressure must be between 5.0 and
9.0 bar (70 and 130 psi). Airflow supply
capacity for a single airline is given in
Table 2.
Generally; each
requires an extra 150 litres per 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 per minute.
An airline flow tester is available from
Scott Health and Safety Limited under
Article Number 1035978.
1
PRO-PAK
specified,
shall not exceed
Airflow (L/min.)
300
450
750
900
Table 2
additional wearer
the
the