CV-17 Shandong (002 carrier) Thread I ...News, Views and operations

[Richard Santos]

Does anyone know why this was done ? ... or even more where does all this water come from? Water draining for three days is surely not a small volume of water.

They could be draining after inclining test. Inclining test involve flooding different spaces or compartments of known volume in the double bottom or hull sides, to create a list or trim in the ship. The purpose is to verify the stability calculation by matching trim or list of the ship with calculations.

 

[Richard Santos]

Must likely bilge and ballast pump testing at full tilt see how they stand under continuous operation? Just speculation

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That doesn't need the pumps to run for several days.

 

[Figaro]

Construction of China's 1st homegrown aircraft carrier ahead of schedule
Source

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Editor
Zhang Tao
Time
2017-09-01

Type 001A undergoing final outfitting, system debugging

China's first homegrown aircraft carrier will soon undergo mooring trials, as outfitting work and system debugging are almost complete, the Chinese defense ministry spokesperson said.

Ren Guoqiang told the Global Times on Thursday that the construction of the Type 001A aircraft carrier is on schedule.

The Type 001A, which was launched on April 26, is being constructed in the coastal city of Dalian, Northeast China's Liaoning Province.

"Outfitting work and system debugging are being conducted, and mooring trials will soon begin," Ren said. Mooring trials are needed to test the carrier, including its power system, communications and radar. During the mooring tests, the ship will stay in the port.

Hu Wenming, the head and Party chief of China Shipbuilding Industry Corporation (CSIC) who visited Dalian Shipbuilding Industry Corporation (DSIC, the manufacturer of the Type 001A) in early August, praised the DSIC's work, saying the "key project" team has completed tasks ahead of schedule, according to the DSIC's website.

Although the website made no mention of the aircraft carrier, a photo shows the meeting of "the Party Committee Working Conference of 002 Aircraft Carrier" (002 is the project's codename).

On August 3, Hu, also the general director of the development of the first homegrown aircraft carrier, told CCTV that the Type 001A will start mooring trials ahead of schedule in September, which means it would only take the carrier five months to get to the mooring trial stage after its launch in April.

"Mooring trials normally take months since they need to fix identified problems and adjust the system, and if everything goes well, the mooring trials might only take about a month. Once the mooring trials are completed, the carrier can move on to its sea tests," said Beijing-based naval military expert Li Jie.

He said "the construction of the aircraft carrier is a huge project. More than 5,000 people worked on the carrier during the peak period. The people who contributed to the carrier's research and development are spread all over the country, including both State-owned military industry and civilian sectors."

Hu said that a total of 532 institutions have participated in the development of the carrier, with 412 of them non-military, including State-owned enterprises, private companies, scientific research institutes and universities, CCTV reported.

 

[Hendrik_2000]

They could be draining after inclining test. Inclining test involve flooding different spaces or compartments of known volume in the double bottom or hull sides, to create a list or trim in the ship. The purpose is to verify the stability calculation by matching trim or list of the ship with calculations.

Ballasting is now done by electronic computer You don't need to calculate it manually. It automatically open the valving system and direct the water to intended ballast tank
Ballast and bilge system are separate system they don't mix!
Ballasting doesn't involve dumping it to the sea It just allocate water to different ballasting tank according to demand. It has water intake to add more water if necessary and storage tank

 

[Hendrik_2000]

addition De Ballasting can take water from the ballast tank and dump it to the sea

 

[Richard Santos]

Ballasting is now done by electronic computer You don't need to calculate it manually. It automatically open the valving system and direct the water to intended ballast tank
Ballast and bilge system are separate system they don't mix!
Ballasting doesn't involve dumping it to the sea It just allocate water to different ballasting tank according to demand. It has water intake to add more water if necessary and storage tank

It has nothing to do with whether the calculation is done manually. It is a physical test to verify the ship's stability. You can calculate all you want, it would be silly to not verify the calculation physically when doing so is cheap. The ballasting for the inclining test is not restricted to the ship's normal ballast tanks. Working compartments can be flooded for the test as well. The purpose is to verify how much the ship will trim or list when major compartment floods, these are then used to create tables for quick references in real damage control situations.

Also, some large steam turbine powered warships are designed so the steam turbine can operate immersed so long as steam supply is uninterrupted, to allow the turbine room to be used for counter flooding in battle without disrupting the operation of the turbine. So the drainage could also be associated with an underwater turbine operating test.

 

[antiterror13]

true ... the crew will still need to be able to do it manually and also to calculate manually ... in the case of emergency ... yes computer will do everything in normal operations

I have no doubt Chinese crew would be excel in manual operations .. remember just not long ago, Chinese warships were so backward compared to the US

 

[Hendrik_2000]

It has nothing to do with whether the calculation is done manually. It is a physical test to verify the ship's stability. You can calculate all you want, it would be silly to not verify the calculation physically when doing so is cheap. The ballasting for the inclining test is not restricted to the ship's normal ballast tanks. Working compartments can be flooded for the test as well. The purpose is to verify how much the ship will trim or list when major compartment floods, these are then used to create tables for quick references in real damage control situations.

Also, some large steam turbine powered warships are designed so the steam turbine can operate immersed so long as steam supply is uninterrupted, to allow the turbine room to be used for counter flooding in battle without disrupting the operation of the turbine. So the drainage could also be associated with an underwater turbine operating test.

All the operation that you describe are draining operation and that is what the bilge pump was supposed to do. the ballasting computer will adjust the amount of water that goes into the ballasting tank It only depend on the level transmitter in the ballasting tank and the sensor .

The sensor(inclinometer) will registered as soon as it is sense that the ship is listing and take action by directing the water into the appropriate tank. Meanwhile the bilge pump will automatically come online and pump the water to discharge it overboard. They do it quite often when cargo ship unloading the container on one side of the ship

The table is only useful when you have an emergency like the shutdown of the computer system due to electrical failure. But in that case it is also doubtful if the control valve can be operated remotely. It need either pneumatic or hydraulic power. The ballasting system has manual overide .
Therefore I don't see the connection of Manual table and Liaoning heeling test

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[Hendrik_2000]

On the different subject
Construction of China's 1st homegrown aircraft carrier ahead of schedule
By Guo Yuandan and Yang Sheng Source:Global Times Published: 2017/8/31 23:13:40

Type 001A undergoing final outfitting, system debugging

China's first domestically-built aircraft carrier is transferred from the dry dock at a launch ceremony in the China Shipbuilding Industry Corporation's Dalian shipyard, in Dalian, Northeast China's Liaoning Province on April 26. Photo: VCG

China's first homegrown aircraft carrier will soon undergo mooring trials, as outfitting work and system debugging are almost complete, the Chinese defense ministry spokesperson said.

Ren Guoqiang told the Global Times on Thursday that the construction of the Type 001A aircraft carrier is on schedule.

The Type 001A, which was launched on April 26, is being constructed in the coastal city of Dalian, Northeast China's Liaoning Province.

"Outfitting work and system debugging are being conducted, and mooring trials will soon begin," Ren said. Mooring trials are needed to test the carrier, including its power system, communications and radar. During the mooring tests, the ship will stay in the port.

Hu Wenming, the head and Party chief of China Shipbuilding Industry Corporation (CSIC) who visited Dalian Shipbuilding Industry Corporation (DSIC, the manufacturer of the Type 001A) in early August, praised the DSIC's work, saying the "key project" team has completed tasks ahead of schedule, according to the DSIC's website.

Although the website made no mention of the aircraft carrier, a photo shows the meeting of "the Party Committee Working Conference of 002 Aircraft Carrier" (002 is the project's codename).

On August 3, Hu, also the general director of the development of the first homegrown aircraft carrier, told CCTV that the Type 001A will start mooring trials ahead of schedule in September, which means it would only take the carrier five months to get to the mooring trial stage after its launch in April.

"Mooring trials normally take months since they need to fix identified problems and adjust the system, and if everything goes well, the mooring trials might only take about a month. Once the mooring trials are completed, the carrier can move on to its sea tests," said Beijing-based naval military expert Li Jie.

He said "the construction of the aircraft carrier is a huge project. More than 5,000 people worked on the carrier during the peak period. The people who contributed to the carrier's research and development are spread all over the country, including both State-owned military industry and civilian sectors."

Hu said that a total of 532 institutions have participated in the development of the carrier, with 412 of them non-military, including State-owned enterprises, private companies, scientific research institutes and universities, CCTV reported.

Here is the video

 

[Richard Santos]

All the operation that you describe are draining operation and that is what the bilge pump was supposed to do. the ballasting computer will adjust the amount of water that goes into the ballasting tank It only depend on the level transmitter in the ballasting tank and the sensor .

The sensor(inclinometer) will registered as soon as it is sense that the ship is listing and take action by directing the water into the appropriate tank. Meanwhile the bilge pump will automatically come online and pump the water to discharge it overboard. They do it quite often when cargo ship unloading the container on one side of the ship

The table is only useful when you have an emergency like the shutdown of the computer system due to electrical failure. But in that case it is also doubtful if the control valve can be operated remotely. It need either pneumatic or hydraulic power. The ballasting system has manual overide .
Therefore I don't see the connection of Manual table and Liaoning heeling test

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This is not a merchant ship. A large warship like this,carrier would have a very large crew of thousands, all extensively trained in damage control, including even the cooks and the stewards, and are all expected to wrestle with catastrophic and wide spread battle damage while still under fire to save the ship in battle, and not just evacuate onto the deck to await rescue when the electric power goes out or major damage control equipment fails, like the paid crew on sparsely manned merchant vessels.

A Major Warship like this carrier almost certainly has redundant, compartmentalized, locally controllable, draining and counterflooding arrangements for emergency damage control use separate from normal ballasting and drainage system. Each major engineering and munition storage compartment at least is likely have its own separate manually operable sea cock to enable the men near or inside the compartment to be quickly flood the compartment directly from the sea for counterfloodimg or explosion prevention purpose. The valves between major ballasting spaces are also likely to be manually operable. The ship is almost certainly equipped with a sizeable number of independent portable high capacity pumps that can run without ship electric power, and draw and discharge through temporary hoses and works completely independently of the ship's normal drainage and fire fighting systems. In addition to draining or filling internal working spaces, these emergency pumps are also probably designed to be usable for emergency, manually controlled shifting of liquids within the ship's normal ballasting and bunker spaces through special hatches in these spaces designed for the purposes.

There is almost certainly several full sets of durable hard copies of all stability curves and tables, procedures and check lists, and at least the more senior damage control officers would be fully trained to carry out all procedures independently of the ship's electrical system or any portable electronic systems.