Abstract: A method manages a gas turbine assembly during start up or shut down, the gas turbine assembly including a twin shaft gas turbine having an input shaft and an output shaft and a speed sensor for measuring a speed of the output shaft, the gas turbine assembly further having a rotor mounted on said output shaft and provided with at least a dry gas seal for preventing leakage of a process gas. The method includes monitoring the speed of the output shaft, and in parallel, reducing or increasing the speed of the input shaft after the monitored speed of the output shaft has remained above zero and below a predefined slow roll speed limit for a predefined acceptable time.

Abstract: A method manages a gas turbine assembly during start up or shut down, the gas turbine assembly including a twin shaft gas turbine having an input shaft and an output shaft and a speed sensor for measuring a speed of the output shaft, the gas turbine assembly further having a rotor mounted on said output shaft and provided with at least a dry gas seal for preventing leakage of a process gas. The method includes monitoring the speed of the output shaft, and in parallel, reducing or increasing the speed of the input shaft after the monitored speed of the output shaft has remained above zero and below a predefined slow roll speed limit for a predefined acceptable time.

Abstract: An apparatus for use in carrying a load particularly in theatrical performances comprising a supported guide rail, with a first and second carriage movably mounted on the guide rail, the first carriage being adapted to carry a movable lift line for carrying the load, and a compensator system linking the first and second carriage and being arranged such that on movement of the first carriage or the second carriage, the other carriage moves in the same direction and the second carriage moves a shorter distance than the first carriage. Lifting and lowering of the load may be achieved independently of travel along the rail and a load may be transported at a constant height.

Abstract: An apparatus for use in carrying a load particularly in theatrical performances comprising a supported guide rail, with a first and second carriage movably mounted on the guide rail, the first carriage being adapted to carry a movable lift line for carrying the load, and a compensator system linking the first and second carriage and being arranged such that on movement of the first carriage or the second carriage, the other carriage moves in the same direction and the second carriage moves a shorter distance than the first carriage. Lifting and lowering of the load may be achieved independently of travel along the rail and a load may be transported at a constant height.