Section 2 Gas turbines

2.1.1 All rotors as finished-bladed and complete with half-coupling are to be dynamically balanced in accordance with the manufacturer's specification in a machine of sensitivity appropriate to the size of rotor.

2.2.1 All casings are to be tested to a hydraulic pressure equal to 1,5 times the highest pressure in the casing during normal operation, or 1,5 times the pressure during starting, whichever is the higher. For test purposes, if necessary, the casings may be subdivided with temporary diaphragms for distribution of test pressure.

2.2.2 Where hydraulic tests cannot be carried out on the casing, alternative proposals will be considered.

2.2.3 Intercoolers and heat exchangers are to be tested to 1,5 times the maximum working pressure on each side separately.

2.3.1 Before installation, the gas turbine is to be tested for five minutes at five per cent above the nominal setting of the overspeed protective device, or 15 per cent above the maximum design speed, whichever is the higher.

2.3.2 Where it is impracticable to overspeed the complete installation, each rotor, completely bladed and with all relevant parts such as half-couplings, is to be overspeed-tested individually at the appropriate speed.