| A | B | C | D | E | F | G | H | I | J | K | |
|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Oxygen supply/demand calculator | Figures entered here are for GSH but feel free to copy and use | Assumptions | ||||||||
2 | 1 kg of oxygen is | 0.8767 | liters | liquid O2 | |||||||
3 | Supply | therefore 1 ton | 876.7 | liters | liquid O2 | ||||||
4 | VIE total supply | 47 | tons (excludes 1 ton mimimum remaining volume) | expansion ratio | 861 | times | at STP | ||||
5 | 35 477 419 | liters (at ambient) | 1 013 | Ambient (mBar) | therefore 1 ton is | 754 839 | liters O2 gas at STP | ||||
6 | Bank supply | 0 | cylinders wilth volume | 0 | liters at full pressure | 134 | atm | ||||
7 | 0 | liters (at ambient) | |||||||||
8 | |||||||||||
9 | Current use | 3.50 | tons/day | 1835 | liters/min average | ||||||
10 | Current average flow rate | 1 835 | on data from MedEng on tons/day as per above calc | 50% or less of max capacity | |||||||
11 | Max VIE/bank flow rate | 3 000 | (report from Med Eng) | (liters per min) | 50-75% of max capacity | ||||||
12 | Duration (min) | 35 477 419 | at current ave rate; | 11 826 | at max rate. | 75-100% of max capacity | |||||
13 | Duration (hours) | 322 | at current ave rate; | 197 | at max rate. | Exceeds maximum capacity | |||||
14 | Duration (days) | 13 | at current ave rate; | 8 | at max rate. | ||||||
15 | |||||||||||
16 | |||||||||||
17 | Demand prediction | ||||||||||
18 | Patients | Criterion | Flow req | Use per category | |||||||
19 | Leakage/loss | minimal/0.5% | liters/min (estimated): | 9 | |||||||
20 | Ventilated patients | 30 | liters/min per vent: | 40 | 1200 | Created by Ross Hofmeyr | |||||
21 | CPAP systems | 10 | liters/min per CPAP: | 30 | 300 | ross.hofmeyr@uct.ac.za | |||||
22 | HFNC systems | 6 | liters/min per HFNC: | 60 | 360 | Please give feedback/corrections | |||||
23 | Face-mask Oxygen | 50 | liters/min per mask: | 10 | 500 | ||||||
24 | "Double-barrel" NPO2: | 5 | liters/min per pt: | 15 | 75 | ||||||
25 | Patients on NPO2 | 20 | liters/min per pt: | 5 | 100 | ||||||
26 | Patients under anaesthesia | 10 | liters/min average: | 2 | 20 | ||||||
27 | |||||||||||
28 | Total use/min | 2555 | l/min | ||||||||
29 | 153300 | l/hr | |||||||||
30 | 3679200 | l/day | |||||||||
31 | 4.874153909 | tons/day |