Patent ID: 8267676

Claim:
An apparatus for preventing seawater from penetrating into a compressor module during lowering to or retrieval from a compression plant on the seabed, wherein the compressor module comprises: an electric motor ( 1 ) and a compressor ( 2 ) which are respectively connected via at least one shaft ( 8 ) and are arranged in a common pressure shell ( 3 ), an inlet pipe ( 5 ) and an outlet pipe ( 6 ) to and from the compressor module which respectively are provided with an isolation valve ( 7 , 7 ′), at least one filling pipe ( 16 ) which has a shut-off valve ( 17 ), at least one drainage pipe ( 12 ) which has a shut-off valve ( 13 ) and is arranged to drain a lower end of the compressor module, and at least one overflow pipe ( 14 ) which has a shut-off valve ( 15 ), and which is spaced apart from the at least one filling pipe ( 16 ), wherein prior to lowering to or retrieval from the seabed, the compressor module is filled with filling fluid via the at least one filling pipe ( 16 ) until overflow of filling fluid through the at least one overflow pipe ( 14 ).