1.1 This International Standard specifies requirements for round seamless nickel and nickel alloy tube for general purposes as well as for condenser and heat-exchanger applications in the following size ranges. 1.1.1 Tube for general purposes Cold worked: outside diameter 4 mm to 240 mm Hot worked: outside diameter 38 mm to 240 mm 1.1.2 Tube for condenser and heat-exchanger applications Cold worked: maximum outside diameter 80 mm with wall thickness up to and including 5 mm. 1.2 Dimensional requirements and limiting bend radii are also specified for U-bent heat-exchanger tubes of outside diameter up to and including 26 mm.