Deals with field acceptance tests of hydraulic turbines, storage pumps or pump turbines. Defines the terms and quantities which are used; specifies methods of testing and ways of measuring the quantities involved in order to ascertain hydraulic performance. Covers the arrangements for tests at the site to determine the extent to which the main contract guarantees have been satisfied. Applies to any size and type of impulse or reaction turbine, storage pump or pump turbine. Particularly applies to machines coupled to electric generators, motors or motor-generators. Applies to machines with unit power greater than 5 MW or with reference diameter greater than 3 m.