Double drum hoist function to ensure high-head hoist safety of LIFTER 50M~80M for the Pump of LNG and LNG and LPGAir type and blast desistance vibration type JIB CRANE, OVER HEAD CRANE, MONORAIL TYPEBlast safe degree appropriate for the installation on the upper side of tankSafely system and high durabillity suitable for structural design high-end