News-Fuzhou Keweisi Shipping Service Co., Ltd.

We know that the sea water has a strong corrosive effect on the ship, and the marine products have a tenacious adhesion to the ship. After the ship is watered down for a period of time, a lot of marine products such as barnacles and algae and rust spots will be attached to the hull. The existence of these attachments accelerates the corrosion of the hull. On the other hand, it increases the resistance of the ship, reduces the navigation speed of the ship, and limits the warship's ability to play. Marine attachment is a general term for animals, plants and micro-organisms that are attached to the bottom of a ship and to the surface of facilities in the sea. The micro-attached species mainly include bacteria, diatoms, protozoa (unicellular animals), chakra and thakra. The type attached products include chlorophyta moss, also known as moss strips, moss vegetables, etc. Also known as sea vegetables, sea vegetables, sea lettuce, green vegetables, moss vegetables, etc. Porous animal sponge, coelenterate hydra, group animal moss, etc. Bivalve mollusks, oyster vines, crustacean barnacles and vertebrate seaweed, etc. Marine attached objects are extremely harmful to ships. They increase the weight of ships, the resistance of ships during navigation, corrode ships and reduce the strength of ships. Shrink the pipe diameter of the cooling pipe and the condenser pipe of the heat exchanger of the ship, which is even completely blocked. Promote the corrosion of ship plate and ship plate welding seam, so that the sea instrument and machinery failure. Acoustic instruments are degraded or disabled due to the absorption of acoustic energy by attached organisms. Increase the accumulation of buildings in the sea, from the impact of waves and currents. Change the fixed depth of the floating body in the water source, etc., and block the hole. The attachment of marine organisms is related to the speed of the ocean current, which is difficult to attach when the speed of the ocean current exceeds 1 sea/volume. The attachment of products is also related to ship materials. Brass, red copper and copper containing more than 65% copper are basically not attached to products. In order to prevent the adhesion of objects, usually use chemical coating on the surface of the ship plate. or special materials. If you use the aircraft carrier Liaoning, the composite material plate is used to prevent the adhesion of the product. And it is necessary to make use of the machine to clean it in time.

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2024/03

What are the common methods of ship maintenance?

New Maintenance Methods In order to improve work efficiency, advanced ship maintenance techniques and methods have been widely adopted in recent years, mainly including: ① high-pressure water with a pressure of up to 500 kgf/cm or high-pressure water sandblasting to clean the hull and remove rust, with a rust removal speed of 2000 meters/hour; ② The hull is painted by a high-pressure airless painting method with a pressure of 200 kgf/cm, and dried by hot air if the climate is humid, spraying speed up to 4000 m/hour; ③ The hull plate is changed by segmental and piecewise prefabrication method, and the daily plate change amount of a single ship reaches 30~40 tons; ④ The diver controls hydraulic rotary brush or pneumatic rotary brush to clean or overhaul the hull underwater, so as to solve the difficulty of repairing large ships without large dock, and can be carried out simultaneously with loading and unloading of goods, so as to reduce the loss of suspension caused by docking; ⑤ Use alkaline solution to remove grease on mechanical and electrical equipment, use acidic solution to remove scale, and use neutral solution to clean electrical appliances, thus greatly improving the cleaning efficiency; ⑥ Take the method of not dismantling and transporting large parts such as crankshafts, shafting and rudder stock to the workshop and repairing them on the ship or in the dock. ⑦ Specialized repair shall be carried out for precision parts such as automation devices, governors, turbochargers, etc; ⑧ The small and medium-sized parts shall be replaced and repaired in groups, and the replaced old parts shall be repaired according to the new standard before reuse.

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2024/03

Ship Paint Construction Process

Ship paint construction process mainly includes the following steps: Preparation stage: First, clean and treat the surface of the hull to remove oil and dirt, and polish and remove rust to ensure that the surface is smooth and clean. At the same time, the hull is inspected and any potential defects and damage are repaired. 1 Primer construction: Primer is used to increase the adhesion of the coating and protect the surface of the hull. Primer is usually used. The composition and performance of the primer should be determined according to the hull material and the use environment. The thickness and uniformity of the coating should be paid attention to during the construction of the primer to prevent leakage and wave coating problems. Intermediate coating construction: intermediate coating is used to increase the thickness of the coating and protect the surface of the hull, and intermediate paint is usually used. In the construction of the coating, attention should be paid to the uniformity and smoothness of the coating to avoid spots and irregularities. Topcoat construction: topcoat is used to increase the gloss and beauty of the coating, usually using topcoat. The color and texture of the finish shall be determined according to the design requirements of the ship. Surface coating construction should pay attention to flatness and smoothness, to prevent brush marks and peeling problems. Application of key technologies: In the process of ship paint spraying, there are several key technologies that need to be mastered, such as spraying technology and drying technology. Spray technology involves how to evenly spray the paint onto the surface of the hull, while drying technology involves the process of rapid drying and curing of the paint. Other precautions: The temperature and humidity of the construction environment will affect the performance of the paint, so it must be controlled within an appropriate range. In addition, weather conditions should also be considered to avoid construction in bad weather. 2 Safety measures: throughout the construction process, strict safety measures must be taken, including but not limited to wearing appropriate personal protective equipment, and proper management of flammable materials. To sum up, marine painting construction is a complex process, covering multiple steps and technical details, aiming to provide a strong, beautiful and durable marine painting.

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2024/03

Ship maintenance is usually divided into several categories

The annual repair is also called minor repair, once every 1-2 years. The annual repair interval for passenger ships and refrigerated ships should be shorter, while that for ordinary cargo ships and barges can be longer. The annual repair of the ship shall be carried out in the dock of the shipyard (see dry dock, floating dock) or on the platoon. The annual repair is mainly for maintenance, such as removing attached marine life and repainting the hull, checking the propeller and rudder, measuring the clearance of the tail shaft, grinding the submarine valve, checking the main engine for lifting the cylinder, etc. Annual repair is generally carried out in combination with annual inspection (see ship inspection). Surveyors conduct general appearance inspection on more than 20 items such as hull, safety, life-saving, fire fighting, lifting and other equipment, as well as power plant, electrical and communication navigation equipment. If defects are found, repair will be carried out so that the ship can maintain the technical conditions for safe navigation before the next annual repair. Overhaul once every 4~6 years, that is, once after 2~3 years of repair, the repair scope is larger than the year of repair, with preventive nature, also in the shipyard or ship row. Maintenance is generally combined with special inspection, by the surveyor of the hull and the ship's main equipment, a total of more than 40 items of inspection, measurement, testing. According to the inspection results, those items that may affect safe navigation by the next overhaul shall be repaired to ensure the service life of the ship. Voyage repair is referred to as voyage repair. Before the year-old repair or overhaul, the ship repair yard will send personnel to the ship docked at the dock, anchorage or sailing to assist the crew to eliminate temporary faults and make the ship continue to operate. Accident repair is a repair to eliminate the damage caused by the accident after the occurrence of a collision, grounding, fire and other accidents or machine damage. The extent of damage to the ship caused by the accident and the scope of repair shall be inspected and appraised by the ship inspection agency. Conversion repair is the modification and repair works carried out to improve the performance of the ship or change the purpose of the ship. Such as the extension of the hull, the ordinary ship to a special ship, the power equipment from the steam engine to diesel engine and so on. Changes involving the basic structure and main parameters of the ship shall be designed in advance and approved by the ship inspection agency.

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2024/03

Marine fishing vessels are divided into coastal, offshore and ocean-going fishing vessels. How to distinguish between the three definitions

A fishing vessel is a vessel used to catch and harvest aquatic animals and plants. According to the operating waters, it is divided into marine fishing vessels and freshwater fishing vessels, and marine fishing vessels are divided into coastal, offshore and ocean-going fishing vessels. Coastal fishing vessels engaged in fishing and harvesting of aquatic animals and plants in coastal waters, such vessels having a small tonnage. Offshore fishing vessels are engaged in fishing and harvesting aquatic animals and plants close to the mainland (Bohai Sea, Yellow Sea, East China Sea, South China Sea). The tonnage of such fishing vessels is generally tens to 100 tons. Ocean-going fishing vessels are engaged in oceanic fishing production. Such fishing vessels are generally equipped with refrigerated processing equipment. The largest tonnage of fishing vessels is generally 500 tons. New vessels have thousands of tons, but they are still a few.

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2024/03

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Hotline:+86 134 0599 8895

Contact Phone:+86 186 5077 7126

E-mail:fuzhoukeweisi@163.com
Fuzhou Kowis Ship Service Co., Ltd.

Address: Liandong U Valley Fuzhou Internet of Things Industrial Park, No. 12 Xingye West Road, Mawei District, Fuzhou City

Hotline:+86 13405998895

Contact Phone:+86 18650777126

E-mail:keweisiqygl@163.com
Fuzhou Kowis Ship Service Co., Ltd.

Address: Liandong U Valley, 12 Xingye West Road, Mawei District, Fuzhou City, Fujian Province. 801-1, Building 1, Fuzhou Internet of Things Industrial Park (Pilot Free Trade Zone)