Cancels and replaces the first edition (1985). Specifies the diameters of double overlap leakproof flexible metal hoses with packing, of circular section, in protected carbon steel. The packing should not be asbestos. Suitable materials include, for example, cotton, fibre-glass, nylon, Kevlar, polyamide, polyester etc. Applies to flexible metal hoses, without external coating, used under pressure, without leakage, at temperatures between -20 °C and a maximum of 230 °C.