[en] It has been verified the calculation of drum and pulleys on cranes as facility the gamma irradiator ISG-500. Drum is a device for rolling steel ropes while the pulley is a circular pieces called disks, and both of which are made from metal or non-metal to transmit motion and force. It has been verified the calculation of forces on the drum, drum diameter and length, and pressuring force occurred on the drums. Likewise to the pulley, the pulley diameter calculations verification, size of disc and shaft power pulleys. From the verification results, it will be obtained whether the data drums and pulley device are safe or not safe to be used. (author)

[en] This final report for the Swiss Federal Office of Energy (SFOE) discusses the experience gained with a small hydro-power installation in Derendingen, Switzerland. This unique 'micro' installation uses an archimedian screw to produce 6.8 kW of power from a head of 1.15 m and a through-flow of 800 - 1000 litres per second. Optimisation of the project is discussed as are the effects of changing water levels above and below the screw. Winter operation is described and the mounting of gratings necessary to avoid the intake of debris is discussed. Fish-passes are looked at and the effort required for maintenance is compared with that for other types of installations. An accident that occurred is analysed and the results of energy-efficiency measurements made on the installation are presented. The report is rounded off with an evaluation of the plant's performance and a review of future work to be done