A little hermetically sealed compressor in a common client refrigerator or freezer generally features a rounded steel outer shell completely welded shut, which seals running gases inside the method, In such cases an R600a refrigerant. There isn't a route for gases to leak, for instance close to motor shaft seals. http://ktp-price.de/maximale-effizienz-tipps-und-tricks-fur-die-effektive-nutzung-eines-kompressors/