tube size, inch  flow, gpm
1/2" 4
3/4" 8
1 14
1 1/4 22
1 1/2 32
2 56
3 120
4 220
6 480
8 830
10 1200
 Reference: Copper Development Association Tube Sizing Calculator for copper piping systems .

Type "K" nominal size

Velocity = 6 fps

This data is for cold water, reduce flow 20% for hot water to avoid erosion problems in copper.

email Richard Caldwell

Caldwell Mechanical
phone (530) 877-6620

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