Kohler 15REYG, Installation Manual

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TP-6727 10/11 Appendix 63
Appendix D Gas Fuel System Installation Planning
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
50000
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.
When the
temperature is lower or if the container contains less
liquid, the vaporization rate of the container is a lower
value.
Lb. of
Propane
in Cyl.
Maximum Continuous Draw In Btu/Hour At
Various Temperatures In
°
C (
°
F)
--18
°
C
(0
°
F)
--7
°
C
(20
°
F)
4
°
C
(40
°
F)
16
°
C
(60
°
F)
21
°
C
(70
°
F)
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 85000 107000 118000
20 36000 51000 68000 83000 92000
10 28000 38000 49000 60000 66000
Figure 1 Vaporization Rate, 100 lb. Propane
Cylinders, Approximate
Determining Propane Vaporization
Capacity
Guide for ASME LP Gas Storage
Containers
% of
Container
Filled
K
Equals
Propane* Vaporization
Capacity at --18
°
C (0
°
F) in
Btu/Hr.
[
60 100 D x L x 100
50 90 D x L x 90
40 80 D x L x 80
30 70 D x L x 70
20 60 D x L x 60
10 45 D x L x 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
Multiplier
--26
°
C (--15
°
F) 0.25
--23
°
C (--10
°
F) 0.50
--21
°
C (--5
°
F) 0.75
--18
°
C (0
°
F) 1.00
--15
°
C (5
°
F) 1.25
--12
°
C (10
°
F) 1.50
--26
°
C (15
°
F) 1.75
--7
°
C (20
°
F) 2.00
Figure 3 Propane Vaporization Temperature