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Fendouji 10,000-meter manned submersible

Fendouji 10,000-meter manned submersibleOn 22 April 2020, the Chinese television channel CCTV conducted a survey among viewers on the choice of a name for a manned submarine that can dive to a depth of 10,000 meters. After almost 100,000 offers with different names were received, Fendouji (Wrestler) was chosen. It is reported that the manned submarine Fendouji was previously tested in the pool at Shipbuilding Institute No. 702 in Wuxi, where various operating conditions in the marine environment in the pool were modeled for the boat and various tests were carried out.

The depth of dive is a symbol of deep sea exploration capability. The improvement of localization and operational capability of deep sea submersibles is the key to ensuring deep sea exploration capabilities. China's self-developed 10,000-meter manned submersible will be developed in 2020 and will go to the Mariana Trench for sea trials.

In December 2017 Ye Cong, chief designer of the 10,000-meter manned submersible and director of the 702 underwater engineering research and development department of China Shipbuilding Industry Corporation, said that the 7,000-meter manned submersible "Zhenlong" and the 4500-meter manned submersible "Deep Sea Warrior" Based on the development experience, the development of the 10,000-meter manned submersible is being carried out in an orderly manner.

Deep-sea submersibles are considered to be the engine and integration platform for the development of deep-sea technology, and also an important support for deep-sea scientific research and resource development. The advancement of related technologies will promote the development of deep-sea equipment supporting technologies and emerging industries. In 2017, the important goal mentioned in the 13th Five-Year Plan for Scientific and Technological Innovation in the Marine Sector issued by the Ministry of Science and Technology and three other departments is to carry out the submersible lineage project. From the "Jilong" to the "Deep Sea Warrior", and then to the 10,000-meter manned submersible, since the implementation of the plan, China's submersible lineage project has progressed in an orderly manner.

There are 37 trenches with a depth of more than 6000 meters in the world. The area where these trenches are located is called the Haidou Abyss, or simply the Abyss. They are the hard-to-reach places in the global ocean so far that are poorly understood. The 9 deepest trenches, including the Mariana Trench, are distributed in the Western Pacific, and 5 of them exceed 10,000 meters in depth.

The latest development is that the 10,000-meter manned submersible manned ball cabin has completed the opening and closing of the entrance and exit windows, that is, the "door" and "window" are processed on the ball cabin. Jia Shuoxiao, general manager of Baoji Titanium Industry Co., Ltd. introduced that the main material of the manned ball cabin uses titanium alloy. Compared with the "Zhenlong" and "Deep Sea Warrior", the ball cabin of the 10,000-meter manned submersible is from material to welding to the overall structure. "There have been relatively large changes."

The submersible has a pressure of 1.1 tons per square centimeter in the 10,000-meter deep sea, which is equivalent to placing a car on the fingernail. The manned ball compartment is the most important barrier to the safety of the submariner. Experts say that the titanium alloy used in China's 10,000-meter manned submersible ball cabin has strong anti-corrosion capability and is expected to be used for 30 years. The designer also overturned the current method of welding the guillotine commonly used in the manned submersible ball cabin, and changed to hemisphere welding. Although the process is more difficult, this reduces the weld seam and shortens the construction period, which significantly improves the reliability of the ball cabin. "When the 10,000-meter manned submersible is built and put into use, it will create a new 'China depth' to further enhance China's ocean detection capability and research level." Ye Cong said.

As the largest pressure vessel in the entire submersible, the manned ball cabin material is very special, and the success or failure of the ball cabin is directly related to the success or failure of the entire project. The engineer used an innovative stitching method, vacuum electron beam welding, so that the "surgery" of the thickness and length of the specification has never been seen at home and abroad. Welding is done in a vacuum environment where the engineer operates the torch outside the vacuum chamber and aligns the equatorial beam between the two hemispheres. The equatorial seam temperature is as high as 1300 degrees Celsius, and the manned cabin rotates on the side of the ball shell, and the engineer welds.

Lei Jiafeng, deputy director of the Research Institute of Titanium Alloys, Institute of Metals, Chinese Academy of Sciences, said that welding must be a continuous process. If there is an arc breaking and re-starting, the welding quality will drop. "We demand a success." And this is just an example of extreme design leading to extreme design and extreme manufacturing.

As the largest pressure vessel in the entire submersible, the manned ball cabin material is very special, and the success or failure of the ball cabin is directly related to the success or failure of the entire project. The engineer used an innovative stitching method, vacuum electron beam welding, so that the "surgery" of the thickness and length of the specification has never been seen at home and abroad. Welding is done in a vacuum environment where the engineer operates the torch outside the vacuum chamber and aligns the equatorial beam between the two hemispheres. The equatorial seam temperature is as high as 1300 degrees Celsius, and the manned cabin rotates on the side of the ball shell, and the engineer welds.

Ye Cong, the chief designer of the 10,000-meter manned submersible and the deputy director of CSIC 702, said in March 2019 that even with the previous technical foundation, the high-pressure and low-temperature deep-sea environment gave the spherical shell welding, buoyancy material testing, lithium battery quality control, The adaptability of hydraulic components has brought unprecedented challenges. A lot of technologies have experienced twists and turns. Ye Cong said that although it is very difficult, it is good to be prepared. The design phase was completed in July last year, and the components are now coming in line. In March, the final assembly stage will be completed. In 2020, the 10,000-meter manned submersible will be tested and put into use, creating a new 'China depth' and further enhancing the ocean in China. Detection capability and research level."

In 2020, China's 10,000-meter manned submersible is about to visit the deepest "Challenger Abyss" in the Mariana Trench, and a "big show" is about to be staged on the "stage" of the deep sea. In March 2020, the 10,000-meter manned submersible completed its assembly at the 702 Institute of China Shipbuilding Corporation and began the full-process tank test. The pool test was conducted in an artificial pool located in Wuxi, Jiangsu. The pool test is the first step of the submersible from the land to the water.

In order to ensure the smooth progress of the sea trial work, in addition to the mother ship "Exploration One", a sea trial support is also needed to protect the mother ship. On December 20, 2018, Hainan Province funded the purchase of a marine engineering vessel under construction at Fujian Mawei Shipyard-later known as "Exploration 2". Compared with the new shipbuilding, the Institute of Deep Sea Science and Engineering of the Chinese Academy of Sciences obtained a ship with excellent performance at a low cost of less than 50%, which greatly shortened the construction and reconstruction period of the ship and met the sea trial of 10,000-meter manned submersibles.



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Page last modified: 01-08-2021 14:08:54 ZULU