Oxygen supply/demand calculator

	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

	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		liters at full pressure	134	atm
7		0	liters (at ambient)
8
9	Current use	0.93	tons/day	487	liters/min average
10	Current average flow rate	487	on data from MedEng on tons/day as per above calc					50% or less of max capacity
11	Max VIE/bank flow rate	2 000	(report from Med Eng)	(liters per min)				50-75% of max capacity
12	Duration (min)	35 477 419	at current ave rate;	17 739	at max rate.			75-100% of max capacity
13	Duration (hours)	1 213	at current ave rate;	296	at max rate.			Exceeds maximum capacity
14	Duration (days)	51	at current ave rate;	12	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):		2
20	Ventilated patients	2	liters/min per vent:	40	80			Created by Ross Hofmeyr
21	CPAP systems	0	liters/min per CPAP:	30	0			ross.hofmeyr@uct.ac.za
22	HFNC systems	4	liters/min per HFNC:	60	240			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	3	liters/min average:	2	6
27
28			Total use/min		1001

	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	22	liters/min per vent:	40	880			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		2235

	A	B	C
1	HFNC Oxygen Flow Calculator
2
3	Change numbers in the boxes	gives	Calculated value
4
5	Calculate produced concentration at different flow rates
6
7	Desired/set flow total flow rate	50	liters/mon
8	Oxygen flow rate set	15	liters/min
9	Turbine produces	35	liters/min
10
11	O2 concentration produced	44.7	%
12
13
14
15
16	Calculate required O2 flow for a given concentration
17
18	Desired/set Flow	50	liters/min
19	Desired O2 concentration	49	%
20
21	Turbine produces	32.3	liters/min
22	O2 flow required	17.7	liters/min