Offshore LPG (Liquefied Petroleum Gas) single-pipe output system and operation method

The invention discloses an offshore LPG single-pipe output system and an operation method, the offshore LPG single-pipe output system comprises an LPG storage system, an LPG conveying system, an LPG metering system, an LPG recycling system and an LPG hose system, and the LPG storage system is connected with an LPG liquid inlet pipeline; an LPG metering system and an LPG hose system are arranged between the LPG transport ship and the LPG storage system, and the LPG recovery system can be connected with the LPG storage system, the LPG transport system, the LPG metering system and the LPG hose system. According to the offshore LPG single-pipe output system, the pressurizing and recycling capacity of the compressor of the LPG recycling system is utilized, the LPG conveying process is reasonably planned, single-pipe output is adopted, the problem that floating facility LPG output and transport ship double-pipe butt joint are difficult is solved, the output hose facility space of an LPG hose system is reduced, and