CIRCUMFERENCE THE EXTERNAL CIRCUMFERENCE SHALL NOT DEPART FROM THE NOMINAL EXTERNAL CIRCUMFERENCE BY MORE THAN s8 mm. LOCAL STRAIGHTNESS LOCAL STRAIGHTNESS IS DEFINED AS THE DEVIATION OF THE SHELL PLATE FROM A STRAIGHT GENERATOR OF LENGTH (L) PARALLEL TO THE TRUE CENTRE LINE OF THE TUBULAR. THIS TOLERANCE SHALL NOT EXCEED 20 % OF THE WALL THICKNESS. LOCAL STRAIGHTNESS SHALL BE CHECKED ON THE INSIDE OR OUTSIDE OF THE PILE. THESE CHECKS SHALL BE CARRIED OUT AT 45DEGREE INTERVALS OF ARC WITH L = 3 m.