Scott AIR-PAK 75 Operating & Maintenance Instructions page 36

CYLINDER REPLACEMENT PROCEDURE
depleted or partially depleted SCBA cylinders must be replaced with full
cylinders as soon as possible. In normal practice, the user removes the
respirator assembly and places it on solid support to change the cylinder.
Cylinder replacement may also be performed while the user is wearing
the respirator assembly with the assistance of a second individual.
THE CYLIndER RETEnTIOn SYSTEm uSEd On THE AIR-PAK 75
SCBA IS dIFFEREnT FROm THE CYLIndER RETEnTIOn SYSTEm
uSEd On THE AIR-PAK WIREFRAmE. COmPARE THE RESPIRATOR
BEIng SERVICEd TO FIguRES 17 And 19 OF THIS InSTRuCTIOn.
COnTInuE THE CYLIndER REPLACEmEnT PROCEduRE uSIng THE
STEPS ASSOCIATEd WITH THE FIguRE dEPICTIng THE RETEnTIOn
SYSTEm InSTALLEd On THE RESPIRATOR BEIng SERVICEd.
use only cylinders of the correct rated pressure for the respirator.
• Model 2.2 SCBA's must use only cylinder and valve assemblies
marked for 2216 psig service (30 minute rated only)
• Model 4.5 SCBA's must use only cylinder and valve assemblies
marked for 4500 psig service (30 minute, 45 minute, or 60 minute
rated)
• Model 5.5 SCBA's must use only cylinder and valve assemblies
marked for 5500 psig service (30 minute, 45 minute, 60 minute, or
75 minute rated)
Always inspect the cylinder valve assembly and the threads on the
cylinder valve assembly before connecting the pressure reducer hose
coupling. never use a cylinder with a damaged cylinder valve assembly
or a cylinder valve assembly with damaged threads.
To replace a depleted or partially depleted cylinder, proceed as follows:
1. Leave the area requiring respiratory protection and be certain that
respiratory protection is no longer required.
2. doff the facepiece. (See TERmInATIOn OF uSE section of this
instruction.)
3. Push in and rotate the cylinder valve knob clockwise and completely
close the cylinder valve.
4. Release residual air pressure in the respirator system by opening
the purge valve slightly. When the flow of air from the facepiece
has stopped, fully close the purge valve.
5. unthread the pressure reducer hose coupling from the cylinder
valve by rotating counterclockwise.
Continue with Step 6 for the Cylinder Retention System
that applies to the respirator being serviced
P/N 595252-01 Rev. B 5/14
NOTE
(Procedure A OR Procedure B).
Page 36 of 48
WARNING
THE USE OF ANY AIR CYLINDER OTHER
THAN A CYLINDER AND VALVE ASSEMBLY
APPROVED FOR USE WITH THE SPECIFIC
S C O T T A I R - PA K R E S P I R ATO R M O D E L
BEING SERVICED MAY RESULT IN LOSS
OF AIR FROM THE CYLINDER OR IMPROPER
OPERATION OF THE RESPIRATOR.
SEE THE NIOSH APPROVAL LABEL (SCOTT
DOCUMENT 595258-01) SUPPLIED WITH
THESE INSTRUCTIONS FOR CYLINDER AND
VALVE ASSEMBLIES APPROVED FOR USE
WITH SPECIFIC SCOTT AIR-PAK MODELS.
WARNING
N E V E R U S E A C Y L I N D E R W I T H A
DAMAGED CYLINDER VALVE ASSEMBLY
OR A CYLINDER VALVE ASSEMBLY WITH
D A M A G E D T H R E A D S . L E A K A G E M AY
OCCUR WHICH COULD CAUSE A LOSS OF
BREATHING AIR OR A SUDDEN RELEASE
OF HIGH PRESSURE AIR RESULTING IN
SERIOUS INJURY OR DEATH.
CAUTION
OVERTIGHTENING THE CYLINDER VALVE
MAY CAUSE DAMAGE THAT COULD RESULT
IN LEAKAGE OF AIR FROM THE CYLINDER.
USE NO TOOLS TO CLOSE THE CYLINDER
VALVE.
CAUTION
DO NOT LEAVE THE CYLINDER VALVE OPEN
WHEN THE RESPIRATOR IS NOT IN USE.
WARNING
BREATHING AIR CYLINDERS ARE TO BE
I N S P E C T E D A N D R E F I L L E D O N LY B E
TRAINED AND AUTHORIZED PERSONNEL.
IMPROPER FILLING OF BREATHING AIR
CYLINDERS MAY CAUSE SERIOUS INJURY
OR DEATH.