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151
APPENDIX
For other cylinder sizes, use the following gas usage chart to estimate your cylinder duration.
OXYGEN USAGE (LPM) TABLE
BREATHS PER MINUTE (BPM)
12
14
16
18
20
22
24
26
28
Volume (ml)
Oxygen Usage (LPM)
50
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
100
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
150
1.8
2.1
2.4
2.7
3.0
3.3
3.6
3.9
4.2
200
2.4
2.8
3.2
3.6
4.0
4.4
4.8
5.2
5.6
250
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
500
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
750
9.0
10.5
12.0
13.5
15.0
16.5
18.0
19.5
21.0
NOTE:
This table uses a PEEP value of 0 cmH
2
O.
CYLINDER DURATION EQUATION
For other cylinder sizes or partially-filled cylinders, the following equation can be used in conjunction with the
above oxygen usage table to estimate cylinder duration.
cylinder duration =
Where:
P
T
= cylinder pressure (typically 2200 PSI for full cylinder)
V
T
= empty cylinder volume (4.5L for an E cylinder).
REPLACING THE SOURCE GAS CYLINDER
When the source gas cylinder needs to be replaced:
Place the patient on an alternate means of ventilation, if necessary.
Power off the ventilator.
NOTE:
Alarms might be encountered and/or the selected Activity Button might be inadvertently changed if
the ventilator is not powered off before replacing the cylinder.
Turn off the oxygen supply according to the regulator and gas supply manufacturers’ instructions.
Remove the regulator and attached source gas supply hose from the used cylinder by turning the handle
counterclockwise.
Slide the regulator over the neck of the new cylinder, and line up the pins on the regulator with the holes in
the cylinder neck. Tighten the tee screw on the regulator by turning the handle clockwise. (The source gas
supply hose should still be connected to the regulator.)
Turn on the oxygen supply according to the regulator and gas supply manufacturers’ instructions.
Power on the ventilator.
NOTE:
Ventilation will not begin until an Activity Button is selected. For more information see "Choosing an
Activity Button (Patient-Selectable) to Begin Ventilation" on page 74.
( )
P
T
V
T
14.7
gas usage