ERW–1 32 310 17 160 3t 12 ½ – 0.20 0.30 0.60 – 25 0.10 ±8%^ (excluding the weld). The height of the internal fin shall not be greater than 60% of the specified wall thickness. ERW–2 39 380 25 240 5t 10 0.20 0.30 0.30 0.60 25 51 51 63 0.13 0.15 ERW–3 44 430 28 270 8t 7 ½ – 0.40 0.30 0.60 63 76 76 88 0.20 0.25 Crushing Test % mm Tolerance Mean Outside Inside Diameter Thickness Tole–rance on mean thick–ness ± mm Over mm U.T.I. mm Tole–rance ± mm Over mm U.T.I. mm

ERW–1 32 310 17 160 3t 12 ½ – 0.20 0.30 0.60 – 25 0.10 ±8%^ (excluding the weld). The height of the internal fin shall not be greater than 60% of the specified wall thickness. ERW–2 39 380 25 240 5t 10 0.20 0.30 0.30 0.60 25 51 51 63 0.13 0.15 ERW–3 44 430 28 270 8t 7 ½ – 0.40 0.30 0.60 63 76 76 88 0.20 0.25 Crushing Test % mm Tolerance Mean Outside Inside Diameter Thickness Tole–rance on mean thick–ness ± mm Over mm U.T.I. mm Tole–rance ± mm Over mm U.T.I. mm