Pressure Loss of Water Due to Friction in Copper Tubes

Pressure Loss of Water Due to Friction in Copper Tubes Types K, L and M Copper Tube - ASTM B88

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Pressure loss of water due to friction (major loss) in copper pipes, Types K, L and M tubes according ASTM B88, can be found in the tables below:

Pressure Loss (psi per foot)
Flow (GPM)	Nominal or standard size (inches)
	1/4
	K	L	M
1	0.14	0.12

Pressure Loss (psi per foot)
Flow (GPM)	Nominal or standard size (inches)
	3/8
	K	L	M
1	0.04	0.02	0.02
2	0.13	0.08	0.08
3	0.28	0.18	0.16

Pressure Loss (psi per foot)
Flow (GPM)	Nominal or standard size (inches)
	1/2
	K	L	M
1	0.01	0.01	0.01
2	0.04	0.03	0.02
3	0.07	0.06	0.05
4	0.13	0.11	0.09
5	0.19	0.16	0.13

Pressure Loss (psi per foot)
Flow (GPM)	Nominal or standard size (inches)
	3/4
	K	L	M
2	0.01	0.01
3	0.01	0.01	0.01
4	0.02	0.02	0.02
5	0.03	0.03	0.02
10	0.13	0.10	0.08

Pressure Loss (psi per foot)
Flow GPM	Nominal or standard size (inches)
	1
	K	L	M
4	0.01	0.01
5	0.01	0.01	0.01
10	0.03	0.03	0.02
15	0.07	0.06	0.05
20		0.10	0.08

Pressure Loss (psi per foot)
Flow GPM	Nominal or standard size (inches)
	1 1/4
	K	L	M
10	0.01	0.01	0.01
15	0.02	0.02	0.02
20	0.04	0.04	0.03
25	0.06	0.05	0.05
30	0.08	0.07	0.07

Pressure Loss (psi per foot)
Flow GPM	Nominal or standard size (inches)
	1 1/2
	K	L	M
15	0.01	0.01	0.01
20	0.02	0.02	0.01
25	0.02	0.02	0.02
30	0.03	0.03	0.03
35	0.05	0.04	0.04
40	0.06	0.05	0.05
45			0.06

Pressure Loss (psi per foot)
Flow GPM	Nominal or standard size (inches)
	2
	K	L	M
25	0.01	0.01
30	0.01	0.01	0.01
35	0.01	0.01	0.01
40	0.02	0.01	0.01
45	0.02	0.02	0.02
50	0.02	0.02	0.02
60	0.03	0.03	0.03
70	0.04	0.04	0.04

The pressure loss is based on the Hazen-Williams formula.

Copper Tubes Types K, L and M - Dimensions

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