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Determining Propane Cylinder
Quantity
Guide for Installing 100 lb. Cylinders
For continuous draws where temperatures may reach
--18°C (--0°F). Assume the vaporization rate of 100 lb.
cylinder as approximately 50000 Btu/hr.
Number of cylinders/side = Total load in Btu
Example:
Assume total load = 200,000 Btu/hour.
Cylinders/side = 200000= 4 cylinders/side
50000
The chart in Figure 1 shows the vaporization rate of
containers in terms of the temperature of the liquid and
the wet surface area of the container.
temperature is lower or if the container contains less
liquid, the vaporization rate of the container is a lower
value.
Maximum Continuous Draw In Btu/Hour At
Various Temperatures In °C (°F)
Lb. of
- -7°C
- -18°C
Propane
(0°F)
(20°F)
in Cyl.
100
113000 167000 214000 277000 300000
90
104000 152000 200000 247000 277000
80
94000
137000 180000 214000 236000
70
83000
122000 160000 199000 214000
60
75000
109000 140000 176000 192000
50
64000
94000 125000 154000 167000
40
55000
79000 105000 131000 141000
30
45000
66000
20
36000
51000
10
28000
38000
Figure 1 Vaporization Rate, 100 lb. Propane
Cylinders, Approximate
TP-6727 10/11
Appendix D Gas Fuel System Installation Planning
50000
When the
4°C
16°C
21°C
(40°F)
(60°F)
(70°F)
85000 107000
118000
68000
83000
92000
49000
60000
66000
Determining Propane Vaporization
Capacity
Guide for ASME LP Gas Storage
Containers
% of
K
Container
Equals
Filled
60
100
50
90
40
80
30
70
20
60
10
45
* These formulae allow for the temperature of the liquid to
refrigerate to --29°C (--20°F), producing a temperature
differential of --7°C (20°F) for the transfer of heat from the air to
the container's wetted surface and then into the liquid. The
vapor space area of the vessel is not considered since its
effect is negligible.
[ D=outside diameter in inches
L=overall length in inches
K=constant for percent volume of liquid in container.
Figure 2 Propane Vaporization Capacity
Vaporizing Capacities for Other Air
Temperatures
Multiply the results obtained with the formulae in
Figure 2 by one of the factors in the following table for
the prevailing air temperature.
Prevailing Air
Temperature
--26°C
(--15°F)
--23°C
(--10°F)
--21°C
(--5°F)
--18°C
(0°F)
--15°C
(5°F)
--12°C
(10°F)
--26°C
(15°F)
--7°C
(20°F)
Figure 3 Propane Vaporization Temperature
Propane* Vaporization
Capacity at - -18°C (0°F) in
Btu/Hr.[
D x L x 100
D x L x 90
D x L x 80
D x L x 70
D x L x 60
D x L x 45
Multiplier
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
Appendix 63
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