From the benefit analysis of enterprise's economic input and output, buying a two-handed boat is far cheaper and shorter than building a new one. However, when buying a ship, it is not enough to simply consider the purchase price, ship type and operating cost. We should also fully understand the technical status of the ship, master the integrity of its equipment and facilities, focus on the safe production of the ship in the future, and ensure the seaworthiness and applicability of the ship's equipment. The leaders of the company attached great importance to the quality of the ship to be purchased, listened carefully to experts' opinions, personally inspected the actual technical conditions of the ship, made comparisons and arguments in many ways, and repeatedly discussed and weighed, taking into account the purchase price of the ship and the technical conditions of the ship, paying special attention to conventional main equipment such as "four engines and one furnace" and key equipment such as cargo tanks, liquid cargo pumps, pressure relief valves, emergency cut-off valve and liquid cargo compressors. Experts, harbor supervisors, surveyors and shippers who have contacted Huaneng 18 LPG carrier in the company agree that the ship has complete facilities and is in good condition, which is superior to ordinary domestic LPG carriers.

2) Carefully check the secondary maintenance of the ship.

When buying a ship, we can only focus on the important equipment and general conditions of the ship, but the two-handed ship has some shortcomings more or less, and the ship inspection specifications and requirements in different countries are also different. In the process of overhaul, it is necessary to strengthen the supervision of repair quality and handle the contradiction between controlling overhaul cost and ensuring the integrity of the ship. According to the document "Hongzi (1994)2 18" issued by the Safety Supervision Bureau of the Ministry of Communications, the crew training of LPG carriers is divided into "safety knowledge" and "safe operation", which is applicable to all crew members and senior crew members. According to this regulation, the company specially studied and arranged, selected a group of crew members with high academic qualifications, strong sense of responsibility and complete positions, organized them to go to professional training units for training, and strictly implemented the system that undocumented personnel were not allowed to board the ship in actual operation.

At the initial stage of operation, the crew members in key positions such as Chief Officer and Bosun who have many years of practical experience in LPG carriers are hired to trade in the old ones for the new ones, and a series of simulation drills are organized to familiarize the crew with the operating specifications of LPG carriers as soon as possible, improve their working ability and avoid unnecessary human accidents. According to the relevant policies and regulations issued by the Ministry of Communications and relevant departments of provinces and cities, drawing lessons from the successful experience of the original shipowners and brother shipping companies, and according to the company's own operating characteristics and the actual situation of the ship, the company has formulated a complete set of safety management rules and regulations for liquefied petroleum gas carriers. A series of rules and regulations, such as Rules for Safe Handling of Liquefied Gas Tanks, Patrol Inspection System for Safety of Liquefied Gas Tanks, Confirmation System for Operation Safety of Liquefied Gas Tanks, and Precautions for Safety Management of Liquefied Gas Tanks, have been newly formulated to organize the crew to study hard and implement them effectively.