Although he was mentally prepared, when Feng Haibo saw this document, he was still deeply shocked by the other party's request.
Not only him, but also the leaders of Jiangnan Changxing Shipbuilding Group and Shen Huan, the only ordinary employee representative, changed their faces and the atmosphere became very solemn after reading this document.
Shen Huan thought to himself, sure enough, it still hasn't changed.
The most important ones are still the same, one is that it requires the loading of more than 20 kinds of liquefied gas, and the density is not the same, which is not particularly excessive.
It's just that in terms of service life, this document clearly states that the service life must reach 30 years, and the most incredible thing is that the other party actually requires these two liquefied gas ships with a load of more than 1,000 tons to achieve the same comfort as cruise ships.
In addition, there are some more detailed requirements, of course, they are all conditions that require time and effort to meet.
For example, the service speed is required to reach fifteen knots; Endurance of 2,000 nautical miles; The structure draft does not exceed four meters and so on and other relatively fine requirements.
After reading it, Feng Haibo closed the document, then stretched out his thumb and rubbed his sun eyes vigorously, and then smiled bitterly: "Mr.
Jiang, are you going to build a cruise ship or a cargo ship?"
To make a cargo ship of more than 1,000 tons reach the comfort level of a cruise ship, I think there are probably not many shipyards in the world that can do it.
Even if we can do it, the cost is not something we can afford.
Millions of dollars can't be made at all, you see if this one can be changed, and we will slowly explore the rest. ” Jiang Baozhu smiled and said, "Mr.
Feng, I believe in your technical strength.
Didn't you just say that there are no technical problems?
Why has there been a change of narrative at this time?
” Feng Haibo smiled bitterly: "Mr.
Jiang, this is the case, to make a cargo ship reach the comfort level of a cruise ship, not only in the decoration of the crew cabin, but more importantly, to improve the seaworthiness of the ship.
If you think about it, the hull design of a cruise ship, in addition to the investment in speed, the most important thing to ensure comfort is to resist complex sea conditions and create a hull with minimal shaking.
Then the only way to achieve this is to increase the width of the hull, increase the height of the freeboard, reduce the height of the center of gravity, reduce the wind pressure lateral force, and reduce the roll angle.
Of course, these two liquefied gas carriers can also be designed like that, but the consequence of this is that the operating costs have increased significantly, and the economy is very poor, do you really need such a liquefied gas carrier?
” Jiang Baozhu said with a smile: "I believe that you can do it, and make the liquefied gas ship have a good level of comfort while ensuring economy."
Mr.
Feng, you should know very well that if a small liquefied gas ship like this encounters bad sea conditions, then it will be difficult for the crew to resist seasickness, and I don't want my crew to lose the ability to work because of this, so this must be satisfied, otherwise we will not be able to talk about it. ” Although I said it with a smile, the meaning is very clear, and if I can't satisfy this at all, then I won't talk about it!
Fu Jianjian, the chief engineer on the side, thought for a while and said: "Mr.
Feng, Mr.
Jiang, if you want to do this, it is not impossible, but the cost will increase a lot."
We can do this with a combination of technical means.
One is to install the stabilizer fin, this device is a kind of stabilizer device that is widely used in warships, cruise ships and other ship types at present, the ship in the process of rocking, through the control mechanism to automatically adjust the angle of the stabilizer fin wing relative to the water flow, so that the left and right two stabilizer fins produce the maximum moment opposite to the swing direction, to achieve the effect of stabilizer.
This anti-roll device works well, and of course it is more significant for passenger ships and warships with higher speeds.
For ships with relatively low speeds, the effect is not so obvious. ” Feng Haibo nodded and said: "Mr.
Fu, our Jiangnan Changxing Shipbuilding Group is of course relatively leading in terms of the technology of the anti-roll device, and the destroyers we built have applied this technology.
If you go on, what else can you do?
” Fu Jianshe said: "The effect of the stabilizer fin on low-speed ships is not very obvious, but we can also combine other technical means.
That is to design a stabilizer tank.
This kind of anti-rolling water tank is not affected by the speed of the ship, and the working principle is that a water tank that is connected left and right is arranged inside the hull, and when the ship rolls, the water in the water tank moves from one side to the other and oscillates back and forth; By adjusting and controlling the water level difference on both sides, the water weight difference between the left and right water tanks produces a torque opposite to the swing direction, so as to achieve the purpose of reducing the rocking.
At present, the passive anti-shake water tank has obvious shortcomings, and in some cases it may be increased.
The active anti-shake water tank responds quickly, but the cost is high, the system is complex, and the power consumption is large.
Perhaps we can use a controllable passive anti-shake water tank, which has a small control system power, a relatively high degree of automation, a relatively small footprint, and high reliability.
If you add the stabilizer fin, I think it can achieve the effect that President Jiang wants. ” Feng Haibo nodded and said, "Yes, the military ships we built for the navy, after using stabilizer fins, the speed is ten to fifteen knots, and the stabilizer effect is the best."
However, in bad sea conditions, the speed will be reduced to a few knots, and the effect will not be obvious, and the stabilizer fin is too expensive to build, and the maintenance and protection is very complicated, but it is not suitable for use on liquefied gas ships.
So I don't think you need to think about the stabilizer fin, and then think about whether there are other technical means, such as rudder sway resistance?
” Fu Jianshe thought for a while and said: "Mr.
Feng, Mr.
Jiang, there are many advantages compared with the stabilizer fin, such as low life cycle cost, light weight, high stability, no need for additional equipment, and space saving.
However, at present, this technology is not very mature, and I am afraid that it will be difficult to install it on a liquefied gas ship for a while!
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” Everyone is a little disappointed, it seems that it is really difficult to achieve both the requirements of the female ship king, and the cost must be taken into account, the operation and maintenance are simple.
In fact, all of you here are ship experts, and everyone knows that the domestic research on rudder resistance is still in the stage of experimental simulation, that is, the research is carried out with remote-controlled self-propelled ship model tests.
And there is no mature product.
There are molded products with rudder resistance in foreign countries, but it is impossible to sell them to Jiangnan Changxing Shipbuilding Group, because those products are used on warships, and no civilian ships apply this technology.
In addition to these methods, only a catamaran can probably meet this demanding requirement.
It's just that the technology of catamarans is too advanced, and only passenger ships are currently applied, and China's shipbuilding industry has introduced catamaran passenger ship technology from Australia.
It's just that the catamaran is a high-speed ship, and it is impossible to use it on a low-speed cargo ship.
For a while, the negotiations fell silent!