The 16-inch large-diameter domestic loading and unloading arm is used for the first time. After 4 years of construction, the 23rd domestic LNG receiving station is about to be put into full operation.
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From July 18th to 20th, the Zhejiang Jiaxing (Pinghu) LNG emergency peak-shaving storage and transportation station terminal, which was constructed by Global Beijing Company as a general contractor, successfully received and unloaded the first ship of LNG, achieving a major milestone in project construction and marking that the 23rd domestic LNG receiving station will be fully put into operation after four years of construction. At 15:00 on July 18, the LNG ship docked. After mooring, one customs and two inspections, hot test, pre-cooling, cold test, unloading, draining, and purging, all work was completed at 1:38 on July 20. The whole process lasted less than 35 hours, setting a record for the shortest loading and unloading time for the first ship at a domestic LNG receiving station. This unloading task has many innovations in the construction of domestic LNG projects. First, the 16-inch loading and unloading arm used is produced by the domestic manufacturer Sino-Ocean. This is the first large-diameter domestic loading and unloading arm put into use in the domestic LNG industry, which will effectively promote the development of localized equipment. The second is to achieve "zero emissions" in the dock process pipeline and the first ship unloading process. All the gas generated during the pre-cooling process is recovered to the low-temperature boil-off gas compressor for export and sales. There is neither any venting nor flare ignition, achieving complete recovery of natural gas. According to reports, in order to ensure the smooth unloading of the first LNG ship, all members of the project department overcame difficulties such as the impact of the COVID-19 epidemic and carefully planned and made various preparations in an orderly manner. The pre-cooling link of the ship unloading main pipe is the key to successful unloading. Starting from June 22, the project department organized the driving personnel, design team, owner operators and construction and transportation personnel to start the pre-cooling work of the terminal process pipeline. They first used gasified natural gas to replace nitrogen in the entire ship unloading system and the gas phase return system, and then used low-temperature natural gas to pre-cool the ship unloading main pipe. The pre-cooling temperature drop rate was controlled at 10 degrees Celsius per hour, and the upper and lower temperature difference was controlled within 50 degrees Celsius to avoid excessive arching of the ship unloading main pipe. The unloading main pipe innovatively adopts the "reverse cooling mode", which uses the pre-cooling volume of an LNG tanker to cool the LNG for the first time in an LNG storage tank of more than 100,000 cubic meters, changing the previous mode of using low-temperature steam and LNG cooling on LNG ships. * * It saves the waiting time for the first ship in port and reduces operating costs.
The Zhejiang Jiaxing (Pinghu) LNG emergency peak-shaving storage and transportation station project includes the reservoir area project, terminal project and external pipeline project. The total investment in terminal engineering and related equipment is 539 million. Two new LNG berths will be built at the A7 and A8 berths in Dushan Port Area A of Jiaxing Port. The designed ship type of A7 berth is a 30,000 GTLNG ship, and the designed ship type of A8 berth is a 5,000 GTLNG ship. The external transmission pipeline is connected to the Zhejiang Provincial Network and Jiaxing City Network.
At 16:00 on July 18, an LNG ship from Malaysia carrying 45,000 cubic meters safely berthed at the liquid bulk cargo operation area of Dushan Port Area, Jiaxing Port, Zhejiang, waiting to be unloaded. The fluid company's on-site transportation team overcame the impact of the epidemic and high-temperature environment and actively cooperated with terminal operators to conduct detailed inspections of key links such as ship-shore docking, air tightness testing, and ERC shutdown of the LNG unloading arm. At 20 o'clock in the evening, the pipeline air tightness test and the ERC switch under low temperature conditions were all normal. With the operation command, the country's first "localized" 16-inch LNG unloading arm receiving station officially started operations. After the uninterrupted extreme cold test of minus 163°C, by the early morning of July 20, the unloading arm successfully completed the unloading work.
The start-up plan is relatively detailed and practical.
The more detailed the better, and you need to rehearse it.
Most people would never think of using a tank truck. For emergency power use in the reservoir area, you should also consider borrowing the emergency power supply vehicle from the power supply department. In the past, a power outage or fire accident occurred at an LNG company, and the emergency power supply in the reservoir area failed. Emergency power supply vehicles were not considered.
Even if LNG tanker pre-cooling capacity is used for the first cooling of LNG in an LNG storage tank with a capacity of more than 100,000 cubic meters, it has changed the previous mode of using low-temperature steam and LNG cooling on LNG ships.* * It saves the waiting time for the first ship in port and reduces operating costs.
If tank trucks are used instead for liquid nitrogen pre-cooling, will costs be reduced to a greater extent?