Simplified Pipe/Pump Sizing Chart (Copper Tubing)

Copper Pipe & Pump Sizing

Pipe Size

BTUH

Friction Head Feet 100’ (straight pipe)

Friction Head Feet 100’ (allowance for fittings and boiler)

Gallons per Minute (GPM) at 20 degree Delta T

1/2”

17,000

4.2’

6’

1.7

3/4”

39,000

4.2’

6’

3.9

1”

71,000

4.2’

6’

7.1

1-1/4”

160,000

4.2’

6’

16.0

1-1/2”

240,000

4.2’

6’

24.0

2”

450,000

4.2’

6’

45.0

2-1/2”

750,000

4.2’

6’

75.0

3”

1,400,000

4.2’

6’

140.0

4”

2,900,000

4.2’

6’

290.0

In order for a pump to obtain the above GPM, the pump must be sized properly to overcome the friction head of 4.2-6 feet per 100’ of copper pipe.

Example: For water to move 7.1 gallons per minute through a 1” pipe that is 200’, the pump must be able to overcome the friction loss of 4.2’-6.0’ per 100’ (4.2’-6.0’ x 2=8.4-12.0 feet). The pump will need to be able to move 7.1 GPM with a 8.4-12 friction head.

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