This document specifies the terms and definitions, basic requirements, design and calibration, technical requirements, test methods, inspection rules, nameplate, packaging, transportation and storage and quality commitment of bulb tubular turbines of 50 MW and above. This document applies to bulb cross-flow propeller turbines (hereinafter referred to as turbines) with a rated power of not less than 50 MW and a nominal runner diameter of not less than 7 m.