A 1-inch Type M copper water distribution main supplies a branch to a group of fixtures with a total demand of 12 gpm. The branch is 40 feet long with four 90-degree elbows. Using a maximum velocity of 8 fps and standard friction loss charts, is the 1-inch pipe adequately sized, or must it be increased?

• Yes, the 1-inch pipe is adequate for 12 gpm.
• No, the friction loss is too low; a smaller pipe could be used.
• Yes, but only if the pipe is Schedule 80.
• No, the velocity is likely too high; the pipe size should be increased.