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BS 2871 Copper Tubes Table X, Y and Z - Working Pressures vs. Size

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The copper used in the manufacture of tubes is phosphorus deoxidized copper Cu-DHP defined by British Standard BS. 6017: 1981. This also corresponds to the ISO denomination Cu-DHP.

The minimum copper content is 99.85% and the residual phosphorus content is between 0.013 and 0.050%. This deoxidized copper is not affected by reducing atmospheres and consequently is well suited to welding and brazing. The density of copper is 8.9 g/cm3. its melting point is 1083 oC and its coefficient of linear expansion is 16.8 x 10-6 per oC (ranging 20 oC - 100 oC).

Note! -  this standard is replaced with EN 1057 - Copper tubes for water and gas in sanitary and heating applications

For full table with Table Z - rotate the screen!

BS 2871 Copper Tubes Table X, Y and Z - Working Pressures
Nom. Diameter
Outside Diameter

Table X
Half hard light gauge tube
Table Y
Half hard an annealed tube
Table Z
Hard drawn thin wall tube

Maximum Working Pressure


Maximum Working Pressure


Maximum Working Pressure

6 6 0.6 13.3 0.8 14.4 0.5 11.3
8 8 0.6 9.7 0.8 10.5 0.5 9.8
10 10 0.6 7.7 0.8 8.2 0.5 7.8
12 12 0.6 6.3 0.8 6.7 0.5 6.4
15 15 0.7 5.8 1 6.7 0.5 5
18 18 0.8 5.6 1 5.5 0.6 5
22 22 0.9 5.1 1.2 5.7 0.6 4.1
28 28 0.9 4 1.2 4.2 0.6 3.2
35 35 1.2 4.2 1.5 4.1 0.7 3
42 42 1.2 3.5 1.5 3.4 0.8 2.8
54 54 1.2 2.7 2 3.6 0.9 2.5
67 67 1.2 2 2 2.8 1 2
76.1 76.2 1.5 2.4 2 2.5 1.2 1.9
108 108.1 1.5 1.7 2.5 2.2 1.2 1.7
133 133.4 1.5 1.4 1.5 1.6
159 159.4 2 1.5 1.5 1.5
  • 1 N/mm2 = 106 Pa = 1 MPa = 10 bar = 1.020x105 kp/m2 = 102.0 m H2O = 9.869 atm = 145.0 psi (lbf/in2)
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