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Status of ocean-going fishing vessels

Status of ocean-going fishing vessels

At present, the number of units engaged in the design and construction of ocean-going fishing vessels in China is limited, the number of self-designed and built ocean-going fishing vessels is small, the technical reserve is insufficient, and the overall construction level is backward. China's ocean-going fishing vessels have slow speed, high energy consumption and 40%-50% fuel cost, which is about 15% higher than that of ocean-going fishing vessels with the same power in advanced countries. Although China is a major shipbuilding country in the world, there are few high value-added fishing vessels built, and the advanced design and construction technology of the shipbuilding industry has not benefited ocean-going fishing vessels. Therefore, it has become a top priority to improve the equipment level of China's ocean-going fishing vessels.

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What are the main aspects of the daily maintenance of the ship?

What are the main aspects of the daily maintenance of the ship?

After a long sea voyage, the ship will be towed into the dock for maintenance. The most contaminated part is the bottom of the ship. According to different sea conditions and the influence of ocean currents, the bottom of the ship will attach a variety of microorganisms, so regular maintenance is required. What should ship maintenance know? 1. What is the purpose of maintenance? The purpose of ship paint maintenance is to extend the service life of the ship's internal, external and various equipment, and to minimize the adhesion of marine organisms on the bottom of the ship to reduce the ship's navigation resistance. Therefore, the ship should develop and fully implement a long-term, preventive maintenance plan, which includes regular flushing, repainting and other maintenance measures. What are the requirements for ship paint? Ship paint generally requires good decoration, weather resistance, anti-corrosion, sun protection, anti-rust, anti-corrosion, anti-fouling, wear resistance, cold resistance and other properties. 3. What are the weather requirements for ship painting construction? The basic requirements for ship painting construction are: clear weather, no wind, no pollution, and humidity in the air within 90%. 4. How should the surface of the ship be treated? (1) When the shipyard is docked for repair, the salt on the hull shall be washed off with high-pressure fresh water, and then the rust skin and the floating paint skin shall be knocked off by sand blasting method (or shot blasting method, commonly known as "sand beating"). Only after the ship's acceptance can the surface of the hull be painted. (2) In places that cannot be sandblasted or are not worthy of sandblasting (small area), derusting can be carried out by tapping shovel or grinding. The tapping shovel can be operated by derusting hammer, blade brush, wire brush and other tools, while mechanical grinding usually uses pneumatic tools, such as pneumatic hammer, grinding wheel and rotating metal parts, etc. to remove rust on the surface of components. After derusting, compressed air should be used to blow the surface dust and rinse with fresh water. (3) For two-component paint, attention should be paid to its blending ratio, curing time and pot life, and the specific operation should be carried out in accordance with the instructions.

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How China's Shipbuilding Industry Becomes the First in the World

How China's Shipbuilding Industry Becomes the First in the World

Have you ever wondered why we can see all kinds of ships at sea, from small fishing boats to large oil tankers, from speedboats to cruise ships, from warships to scientific research ships? How are these ships built? What kind of story is behind them? Today, let us learn about the development history and achievements of China's shipbuilding industry! The shipbuilding industry refers to a comprehensive industry that focuses on shipbuilding and includes marine equipment, marine materials, marine electronic instruments, marine engineering equipment and other related industries. It is an important strategic, basic and leading industry of the country, and an important manifestation of the country's comprehensive strength and international competitiveness.

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Tonnage size of ocean-going fishing vessels

Tonnage size of ocean-going fishing vessels

Definition and types of tonnage of 1. ocean-going fishing vessels Ocean-going fishing vessels refer to large-scale long-distance fishing at sea, which usually requires a variety of facilities, such as refrigeration systems, breakwaters, fishing equipment, trawls, etc. According to the use of different functions and design structure, ocean fishing vessels can be divided into many types, tonnage is not the same. Reference for 2. the tonnage size of ocean-going fishing vessels 1. Small ocean-going fishing vessels: the general tonnage is about 50-100 tons, mainly used for small-scale offshore fishing. 2. Medium-sized ocean-going fishing vessels: the general tonnage is about 100-300 tons, which is suitable for medium-and large-scale fishing and long-distance ocean voyages. 3. Large-scale ocean-going fishing vessels: The general tonnage is about 300-500 tons, which can be suitable for large-scale fishing and can sail for a long time in larger sea areas. 4. Ultra-large ocean-going fishing vessels: The general tonnage is more than 500 tons, which is a trend in the development of ocean-going fisheries. It can carry out large-scale and efficient fishing, and at the same time can respond flexibly in different sea areas. In short, the tonnage of different types of ocean-going fishing vessels varies according to their functions and designs. For example, small ocean-going fishing vessels generally use 50-100 tons of tonnage, while super-large ocean-going fishing vessels can reach more than 500 tons of tonnage.

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The hazards of barnacles to ships

The hazards of barnacles to ships

Barnacles are dangerous. A barnacle is an arthropod with a limy shell attached to seaside rocks, often forming dense colonies. Barnacles are attached to coastal docks, ship bottoms, submarine cables, etc., often causing great harm. Its hazards are as follows: 1, increase the ship resistance consumption of fuel: due to the attachment of barnacles, making the ship below the waterline roughness increased, so that the ship in the navigation of the resistance increased, at the same time also increased the weight of the ship led to the ship, the ship's navigation speed decreased, increased fuel consumption. 2. Increase the dead weight and weaken the anti-risk ability: if the offshore oil platform and construction facilities are attached by barnacles, the dead weight of these facilities will be increased, the external load will be increased, and the ability to resist storm waves will be weakened. 3. Affect the comprehensive utilization of seawater resources: barnacles will block the water supply and drainage pipelines of oil platforms and power plants that use seawater for cooling, affecting the cooling effect of seawater. 4, hinder the use of instruments and equipment: barnacles attached to hinder the normal work of military facilities and civilian, scientific research instruments, reduce the sensitivity of sensors, instruments and transmission components. 5. Affect fishery production and reduce the quality of aquatic products: barnacle attachment affects aquaculture, competes with shellfish for attachment base and bait, blocks mesh, affects water exchange, hinders the growth and development of aquaculture objects, and reduces the quality of aquatic products. 6. Accelerate the local corrosion rate of underwater fixation: the attachment of barnacles will change the electrochemical corrosion process and speed of local metal, resulting in local corrosion or perforation.

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