15. Examples
PNEG-308 Purafire 51
Example 2
Determine the pipe size for a 5 PSI Propane “High Pressure” installation.
Because the appliance near junction E is the farthest away from the LP tank, use this distance.
Section A-E is 380' long. Use the 400' line on the “Propane @ 5 PSI” chart.
Figure 15B
Example 3
Determine the pipe size for an 11" water column “Low Pressure” installation. The primary regulator on
the tank is set for 10 PSI delivery pressure.
Because there will be two (2) different pressure ranges, two (2) different charts will be used.
High Pressure line: Section A-B is 30' long. Use the 30' line on the “Propane @ 10 PSI” chart.
Low Pressure line: Section B-F is 350' long. Use the 350' line on the “Propane @ 11" W.C.” chart.
NOTE: When the required pipe size is larger than the inlet or outlet side of a regulator, use a bell reducer
or bushing immediately
entering or exiting the regulator.
Section BTU Demand Pipe Size
A-B 900 1"
B-C 675 3/4"
C-D 450 1/2"
D-E 225 1/2"
Section BTU Demand Pipe Size
A-B 900 1/2"
Section BTU Demand Pipe Size
B-C 900 2-1/2"
C-D 675 2"
D-E 450 1-1/2"
E-F 225 1-1/4"
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