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Source
Equipment Sizing
The proper sizing of a medical gas
system has never been an exact science. The spreadsheets below are generally
accepted sizing criteria; however, each facility may differ in its
individual gas needs - flow required or the % use factor may
have to be adjusted. Be sure to understand the flow required for specific
equipment such as anesthesia machines and ventilators as equipment such as
these may change the overall sizing.
| medical air compressor system |
(click to open worksheet) |
| medical vacuum system |
(click to open worksheet) |
| medical oxygen system |
Operating Rooms:
500 cubic feet will last approx 2 weeks assuming:
3 - 4 l/m per bed
8 hours of use per day
(3 l/m)(60 min / hour)(8 hours) / 28.8 liters per ft3 =
50 ft3 per OR per day
10 days = 500 cubic feet of oxygen
Recovery:
allow an additional 7.0 ft3 per recovery position per
patient
(10 l/m)(20 minutes per patient) / 28.8 liters per ft3
= 7.0
Patient Rooms:
3 - 4 l/m per room (time will vary depending on care
area)
if ventilators are run off oxygen, approx. 3 to 7.0
SCFM each
(check with ventilator manufacturer)
Long Term Care:
3 - 4 l/m per bed
for continuous usage:
(3 l/m)(60 minutes / hour)(24 hours a day) / 28.8 liters per ft3 =
150 cubic feet per day
Notes:
oxygen will expand 860 times its liquid volume
approx. 251 cubic feet per H cylinder
some freezing of bulk lines (by the vaporizer) is normal |
| nitrogen |
number of operating rooms:
total # of "H" cylinders
1 - 2
4 (2 x 2)
3 - 4
8 (4 x 4)
5 - 6
12 (6 x 6)
7 - 8
16 (8 x 8)
9 - 10
20 (10 x 10)
11 - 12
24 (12 x 12)
13 - 14
28 (14 x 14)
Notes:
"standard" OR typically needs approx 8.0 SCFM
orthopedic or thoracic OR needs approx 15 SCFM
nitrogen regulators will typically flow a maximum of 70 SCFM
size so that each OR can use tools simultaneously
approx 230 cubic feet per H cylinder |
| nitrous oxide |
number of operating rooms:
total # of "H" cylinders
1 - 4
4 (2 x 2)
5 - 8
8 (4 x 4)
9 - 12
12 (6 x 6)
13 - 16
16 (8 x 8)
17 - 20
20 (10 x 10)
Notes:
1 cylinder per anesthetizing room
check with anesthesia machine manufacturer for flow (most
use appox 0.2 SCFM per machine)
approx 560 cubic feet per H cylinder |
| carbon dioxide |
number of operating rooms:
total # of "H" cylinders
1 - 8
4 (2 x 2)
9 - 16
8 (4 x 4)
17 - 32
12 (6 x 6)
Notes:
approx 1/4 of an H cylinder per OR
approx 560 cubic feet per H cylinder
special procedure rooms / labs may require more CO2 |
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