It is the modification of hermetically sealed compressor. Instead of welded steel shell, top cover is bolted to compressor housing. Due to the bolted construction, parts of compressor become accessible after removing the top cover. Therefore, repair or servicing of parts can be done. Motor is contained within the compressor housing and is cooled by the liquid refrigerant itself.
Difference between Hermetically Sealed Compressor and Semi-hermetically Sealed Compressor
| S.No | Hermetically Sealed Compressor | Semi hermetically Sealed Compressor |
| 1 | Hermetically sealed compressor is a completely sealed housing, with its motor also sealed in same housing. | Semi-hermetically sealed compressor is also enclosed with motor in the same housing, but the casing is bolted type. Therefore, repairs can be done easily. |
| 2 | Hermetically sealed compressor uses a one-piece welded steel casing, which cannot be opened for repair. Therefore, if the hermetic compressor fails, it needs to be replaced with an entire new unit. | Semi-hermetically sealed compressor uses a large cast metal shell, which has a bolted cover With gaskets provided in between them to have leak proof bolted joint, which can be opened to replace motor and pump components. |
| 3 | It is leak proof, but cannot be repaired. | It is leakproof repairable and more reliable in operation. It has long life. |