Ovalization note (a)
Thickness >= 20, welded, all t/D ratios: + 17,0 / – 12,5 % >= 20, seamless, t/D <= 5 %: + 22,5 / – 12,5 % >= 20, seamless, t/D > 5%: + 15,0 / – 12,5 %
Length mm (n) + 6 / – 0
Rettilineità < 3,2 mm/3m
Diameter + 4,00 / – 0,80
