where
symbols are as defined in 4.1.1
c = 0,8 mm for copper, aluminium brass, and coppernickel alloys where the nickel content is less than 10 per cent
= 0,5 mm for copper-nickel alloys where the nickel content is 10 per cent or greater
= 0 where the media are non-corrosive relative to the pipe material
σ may be obtained from Table 1.6.2. Intermediate values may be obtained by linear interpolation.
Table 1.6.1 Minimum thickness for copper and copper alloy pipes