Actual Burst Pressures,1 Types K, L and M Copper Water Tube, psi at Room Temperature

Nominal or standard size, inches Actual outside diameter, in. K L2 M
Drawn Annealed Drawn Annealed Drawn Annealed
½ 5/8 9840 4535 7765 3885 6135 –
¾ 7/8 9300 4200 5900 2935 4715 –
1 1-1/8 7200 3415 5115 2650 3865 –
1¼ 1-3/8 5525 2800 4550 2400 3875 –
1½ 1-5/8 5000 2600 4100 2200 3550 –
2 2-1/8 3915 2235 3365 1910 2935 –
2½ 2-5/8 3575 – 3215 – 2800 –
3 3-1/8 3450 – 2865 – 2665 –
4 4-1/8 3415 – 2865 – 2215 –
5 5-1/8 3585 – 2985 – 2490 –
6 6-1/8 3425 – 2690 – 2000 –
8 8-1/8 3635 – 2650 – 2285 –
1 The figures shown are averages of three certified tests performed on each type and size of water tube. In each case wall thickness was at or near the minimum prescribed for each tube type. No burst pressure in any test deviated from the average by more than 5 percent.
2 These burst pressures can be used for ACR tube of equivalent actual O.D. and wall thickness.