Technical exchange on maintenance and repair of GEA Grasso screw compressors

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First, basic information about the GEA Grasso compressor is provided. Mines are areas prone to accidents; incidents such as gas explosions, coal dust explosions, coal and gas outbursts, mine fires, widespread loss of air supply, widespread power outages, roof collapses, floods, fires, and explosions can all occur. Beneath the ground lies a German-made GEA Grasso screw compressor unit. This compressor has been in operation for over ten years, and we have conducted various tests on it, including vibration analysis, noise measurement, and parameter analysis. It was found that the bearings at both the exhaust and intake ends of the compressor were damaged, and wear had also occurred inside the compressor chamber due to bearing deformation. To resolve the temperature issue in the mine as soon as possible, we worked non-stop without sleeping for two days straight; it was a real battle, but in the end we achieved victory! To commemorate this battle, I’m posting this to pay tribute. Feel free to ask me any technical questions at any time. Below is a brief introduction to the GEA Raschke screw compressor units: For the maintenance of GEA Raschke screw compressor units, all the compressor components are imported from Germany. Advanced German technology and the most precise manufacturing equipment are used, with 3D technology applied in the design and production process to ensure high quality and performance of the compressors. The standard design pressure of the housing is 28 bar, with a strength test pressure as high as 43 bar. The rotor features an asymmetric tooth profile, resulting in a small pressure difference between adjacent working chambers. This leads to lower compression losses, more balanced pressures at both ends of the male and female rotors, higher volumetric efficiency, and smoother and more reliable operation. The specific volume ratio is adjustable, allowing the compression ratio inside the unit to match that outside at any time, thereby avoiding energy losses caused by over-compression or under-compression and achieving the optimal COP. The shaft seal is located at the low-pressure side of suction, experiences lower pressure, and thus has a longer lifespan. The compressor models include: SSP1-P, SSP1-R, SSP1-S, SSP1-T, SSP1-V, SSP1-W, SSP1-Y, SSP1-Z, SSP1-XA, etc. The SP1 compressor models are: SP1-C, SP1-D, SP1-E, SP1-G, SP1-H, SP1-L, SP1-M, SP1-N, SP1-P, SP1-R, SP1-S, SP1-T, SP1-V, SP1-W, SP1-Y, SP1-Z, SP1-XA, SP1-XB, SP1-XC, SP1-XD, SP1-XE, SP1-XF. The chiller in his home can operate for over a decade without any problems, as long as the evaporator doesn’t leak and the control system remains dry. Fridge machines are constantly exposed to harsh operating conditions; it is recommended to carry out a comprehensive inspection and overhaul every 3 years to ensure smooth production operations.