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# A.6.3 Example 3: Branch Length Method

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Determine the required semirigid copper tubing size of each section of the piping system shown in Figure A.6.3, with a designated pressure drop of 1-inch w.c. (250 Pa) (using the Branch Length Method). The gas to be used has 0.60 specific gravity and a heating value of 1,000 Btu/ft

^{3}(37.5 MJ/m

^{3}).

**Solution:**

- Section A

- The length of tubing from the
*point of delivery*to the most remote*appliance*is 50 feet (15240 mm), A+ C. - Use this longest length to size Sections A and C.
- Using the row marked 50 feet (15240 mm) in Table 402.4(10), Section A, supplying 220 cfh (6.2 m
^{3}/hr) for four appliances requires 1-inch tubing.

- The length of tubing from the
- Section B

- The length of tubing from the
*point of delivery*to the range/oven at the end of Section B is 30 feet (9144 mm), A+ B. - Use this branch length to size Section B only.
- Using the row marked 30 feet (9144 mm) in Table 402.4(10), Section B, supplying 75 cfh (2.12 m
^{3}/hr) for the range/oven requires^{1}/_{2}-inch tubing.

- The length of tubing from the
- Section C

- The length of tubing from the
*point of delivery*to the dryer at the end of Section C is 50 feet (15240 mm), A+ C. - Use this branch length to size Section C.
- Using the row marked 50 feet (15 240 mm) in Table 402.4(10), Section C, supplying 30 cfh (0.85 m
^{3}/hr) for the dryer requires^{3}/_{8}-inch tubing.

- The length of tubing from the
- Section D

- The length of tubing from the
*point of delivery*to the water heater at the end of Section D is 30 feet (9144 mm), A+ D. - Use this branch length to size Section D only.
- Using the row marked 30 feet (9144 mm) in Table 402.4(10), Section D, supplying 35 cfh (0.99 m
^{3}/hr) for the water heater requires^{3}/_{8}-inch tubing.

- The length of tubing from the
- Section E

- The length of tubing from the
*point of delivery*to the furnace at the end of Section E is 30 feet (9144 mm), A+ E. - Use this branch length to size Section E only.
- Using the row marked 30 feet (9144 mm) in Table 402.4(10), Section E, supplying 80 cfh (2.26 m
^{3}/hr) for the furnace requires^{1}/_{2}-inch tubing.

- The length of tubing from the

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