Method and apparatus for filling fuel gas in a gas turbine

A method of filling fuel gas in a gas turbine, which gas turbine comprises a fuel line for supplying the fuel gas;

• a fuel main valve provided on said fuel line;
• a fuel valve provided on said fuel line on the downstream of said fuel main valve;
• a combustor nozzle as an outlet for the fuel gas;
• an inert gas supply for supplying an inert gas to said fuel line;
• an inert gas purge valve for purging out the inert gas out of said fuel line;
• and a pressure detector for detecting a pressure in said fuel line, the method comprising the steps of:
• gradually opening said fuel main valve and simultaneously checking the pressure in said fuel line detected by said pressure detector;
• stopping opening of said fuel main valve when the pressure detected by said pressure detector has reached a predetermined first pressure;
• waiting for lapse of a predetermined time;
• checking the pressure in said fuel line detected by said pressure detector and determining whether the pressure detected by said pressure detector has reached a predetermined second pressure;
• gradually further opening said fuel main valve if the pressure detected by said pressure detector has not reached the second pressure,
• checking the pressure in said fuel line detected by said pressure detector and determining whether the pressure detected by said pressure detector has reached a predetermined third pressure;
• closing said inert gas purge release valve if the pressure detected by said pressure detector has reached the third pressure;
• checking the pressure in said fuel line detected by said pressure detector and determining whether the pressure detected by said pressure detector has reached a predetermined fourth pressure;
• and
• fully opening said fuel main valve if the pressure detected by said pressure detector has reached the fourth pressure.