5.1.3 The minimum thickness, tb, of a straight steel pipe to be used for a pipe bend is to be determined by the following formula, except where it can be demonstrated that the use of a thickness less than tb would not reduce the thickness below t at any point after bending:
where symbols are as defined in 4.1.1 c and σ are obtained as in 5.1.2 in general, R is to be not less than 3D.
5.1.4 For pipes passing through tanks, where the thickness has been calculated in accordance with 5.1.2 or 5.1.3, an additional corrosion allowance is to be added to take account of external corrosion; the addition will depend on the external medium and the value is to be in accordance with Table 1.5.2.
5.1.5 Where the pipes are efficiently protected against corrosion, the corrosion allowance, c, may be reduced by not more than 50 per cent.
5.1.3 The minimum thickness, tb, of a straight steel pipe to be used for a pipe bend is to be determined by the following formula, except where it can be demonstrated that the use of a thickness less than tb would not reduce the thickness below t at any point after bending:where symbols are as defined in 4.1.1 c and σ are obtained as in 5.1.2 in general, R is to be not less than 3D.5.1.4 For pipes passing through tanks, where the thickness has been calculated in accordance with 5.1.2 or 5.1.3, an additional corrosion allowance is to be added to take account of external corrosion; the addition will depend on the external medium and the value is to be in accordance with Table 1.5.2.5.1.5 Where the pipes are efficiently protected against corrosion, the corrosion allowance, c, may be reduced by not more than 50 per cent.
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