Flexibility, customer centricity and an unusual inspection witnessed by the customer A special practical report on the VML 250 screw compressor A Danish biotechnology company wanted to replace its existing turbo compressors used in a fermentation process. The customer ordered from AERZEN a function test at full speed and pressure difference in connection with a sound measurement. The aim of the test was to ensure that the AERZEN Delta Screw packages VML 250 deliver the agreed performance (> 200 m³/min at 20.0 bar). The Delta Screw package VML 250 during the function test in the AERZEN Acoustics HallIn the AERZEN Acoustics Hall, up until now only machines of up to 500 kW have been tested in frequency converter operation, so Aerzen Rental helped out with a 1.2 megawatt diesel generator (= 1.2 million watts), which could supply enough energy by means of a special circuit to operate the assembly. Normally, the generator is started up and only when it is running at full speed is the assembly switched on. Without a frequency converter, however, the current consumption of the motor increases tenfold. As there was no frequency converter with sufficient power available, the machine was started in parallel with the diesel generator, which slowly pulled the electric motor up to speed.AERZEN has everything under controlAerzen Rental contributed a 1.2 megawatt diesel generator for the function test.The start button was pressed and the thick cables were pushed apart by the enormous magnetic field. The assembly started reliably and stabilised at the predetermined speed. After a preliminary test, the customer was presented with his machine the next day. On the day of acceptance testing every-thing went smoothly. The machine was able to maintain the promised values, the customer was satisfied and thanked AERZEN for our efforts.