# 1315.6 Variable Gas Pressures

**Solution:**

- Maximum gas demand of Outlet A —
32 cubic feet per hour (0.91 m

^{3}/h) (from Table 1308.4.1).Maximum gas demand of Outlet B —

3 cubic feet per hour (0.08 m

^{3}/h) (from Table 1308.4.1).Maximum gas demand of Outlet C —

59 cubic feet per hour (1.67 m

^{3}/h) (from Table 1308.4.1).Maximum gas demand of Outlet D —

136 cubic feet per hour (3.85 m

^{3}/h) [150 000 Btu/hour (44 kW)] divided by 1100 Btu per cubic foot (0.0114 kW•h/L) - The length of pipe from the gas meter to the most remote outlet (Outlet A) is 60 feet (18 288 mm).
- Using the length in feet column row marked 60 feet (18 288 mm) in Table 1315.2(1):
Outlet A, supplying 32 cubic feet per hour (0.91 m

^{3}/h), requires^{1}/_{2}of an inch (15 mm) pipe.Section 1, supplying Outlets A and B, or 35 cubic feet per hour (0.99 m

^{3}/h) requires^{1}/_{2}of an inch (15 mm) pipe.Section 2, supplying Outlets A, B, and C, or 94 cubic feet per hour (2.66 m

^{3}/h) requires^{3}/_{4}of an inch (20 mm) pipe.Section 3, supplying Outlets A, B, C, and D, or 230 cubic feet per hour (6.51 m

^{3}/h), requires 1 inch (25 mm) pipe. - Using the column marked 60 feet (18 288 mm) in Table 1315.2(1) [no column for actual length of 55 feet (16 764 mm)]:
Outlet B supplying 3 cubic feet per hour (0.08 m

^{3}/h), requires^{1}/_{2}of an inch (15 mm) pipe.Outlet C, supplying 59 cubic feet per hour (1.67 m

^{3}/h), requires^{1}/_{2}of an inch (15 mm) pipe.Using the column marked 60 feet (18 288 mm) in Table 1315.2(1):

Outlet D, supplying 136 cubic feet per hour (3.85 m

^{3}/h), requires^{3}/_{4}of an inch (20 mm) pipe.

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