A compressor assembly comprising: a casing comprising a part; a rotor coupled within said casing, wherein said rotor comprises a rotor shaft; and an inlet housing coupled to said casing such that said rotor shaft extends into said inlet housing, said inlet housing defines a flow path into said casing and comprises a liquid injection apparatus coupled within said flow path, said liquid injection apparatus comprising at least one conduit and at least one nozzle coupled to said at least one conduit, wherein said liquid injection apparatus is panel-shaped and has: a first panel segment; a second panel segment; a passage defined between said first panel segment and said second panel segment, said passage sized to receive at least one of said rotor shaft and said casing part; and a third panel segment positioned between said first panel segment and said second panel segment, wherein said third panel segment is at least in part detachable from at least one of said first panel segment and said second panel segment for receiving at least one of said rotor shaft and said casing part between said first panel segment and said second panel segment, and wherein said third panel segment: is at least in part pivotable between said first panel segment and said second panel segment; and/or is at least in part slidable along at least one of said first panel segment and said second panel segment. a casing comprising a part; a rotor coupled within said casing, wherein said rotor comprises a rotor shaft; and an inlet housing coupled to said casing such that said rotor shaft extends into said inlet housing, said inlet housing defines a flow path into said casing and comprises a liquid injection apparatus coupled within said flow path, said liquid injection apparatus comprising at least one conduit and at least one nozzle coupled to said at least one conduit, wherein said liquid injection apparatus is panel-shaped and has: a first panel segment; a second panel segment; a passage defined between said first panel segment and said second panel segment, said passage sized to receive at least one of said rotor shaft and said casing part; and a third panel segment positioned between said first panel segment and said second panel segment, wherein said third panel segment is at least in part detachable from at least one of said first panel segment and said second panel segment for receiving at least one of said rotor shaft and said casing part between said first panel segment and said second panel segment, and wherein said third panel segment: is at least in part pivotable between said first panel segment and said second panel segment; and/or is at least in part slidable along at least one of said first panel segment and said second panel segment. a first panel segment; a second panel segment; a passage defined between said first panel segment and said second panel segment, said passage sized to receive at least one of said rotor shaft and said casing part; and a third panel segment positioned between said first panel segment and said second panel segment, wherein said third panel segment is at least in part detachable from at least one of said first panel segment and said second panel segment for receiving at least one of said rotor shaft and said casing part between said first panel segment and said second panel segment, and wherein said third panel segment: is at least in part pivotable between said first panel segment and said second panel segment; and/or is at least in part slidable along at least one of said first panel segment and said second panel segment. is at least in part pivotable between said first panel segment and said second panel segment; and/or is at least in part slidable along at least one of said first panel segment and said second panel segment.