The U.S. Navy uses a single coat of high solid state paint to reduce the corrosion of surface ships
the U.S. Navy uses a single coat of high solid state paint to reduce the corrosion of surface ships
July 13, 2010
(view all pictures of Chinese paint)
[China paint information] according to the report of the government audit bureau, the corrosion control cost is the largest controllable maintenance cost within the U.S. military
ship corrosion not only costs the Navy billions of dollars per year, but also reduces the service life of ships
the maintenance and management of tank and void is very necessary to maintain the life of the ship
the Navy uses single coat high solid state coating, which can reduce the spraying operation time and prolong the metal life
shipbuilding is only part of the solution to the Navy's plan to build a fleet of 313 ships to meet national security needs. It is also very important to properly maintain the active ships, which can keep them in good condition within or even beyond their service life. The prevention and control of corrosion and the damage of seawater to the ship body have been the most concerned issues in the whole life cycle of the Navy management fleet as early as the era of wooden ships
major general James P. mcmanamon is the deputy commander in charge of surface warfare at the naval maritime systems command in Washington. He told sea power that the average life of a fleet is 16.8 years
Maj. Gen. mcmanamon said: "by 2020, 75% of the fleet of 313 ships in the US Navy will be in active service today. If we do not modernize and maintain the existing fleet, we will never be able to achieve the goal of 313 ships. Under the double constraints of budget pressure and the time limit for building new ships, we cannot purchase the number of new ships."
Colonel Mike Wiegand is the assistant chief of staff responsible for maintenance and engineering of the naval surface force (U.S. Pacific Fleet) of the US Pacific Fleet in San Diego. He said: "if it comes to keeping our ships in good condition throughout the service cycle, corrosion control and prevention will be the highest priority issue. The underwater environment in which our ships are on duty is very poor. It takes unremitting and even rigorous efforts to control corrosion to a certain level as the economy warms up."
mcmanamon pointed out that the aging rate of US Navy ships is accelerating due to various reasons. These reasons include: the fleet's fast duty rhythm; Unscientific task arrangement; Lack of comprehensive corrective maintenance; Some maintenance teams failed to perform the ship body screening
he pointed out that corrosion would not disappear as long as ships existed. However, in some places, even if a ship has the cumulative effect of structural deterioration, it is not likely to be noticed by naval personnel
according to the report of the government audit office, corrosion control cost is the largest controllable maintenance cost within the U.S. military. According to a research result of LMI government consulting in 2005, corrosion cost has accounted for 25% of naval ship maintenance expenditure, which is about US $2.44 billion per year. Based on the data of 2004, LMI deduced the data of 2006 and 2007, and pointed out that the corrosion cost would rise to $3.8 billion annually by 2006, and this figure is expected to drop to $3.2 billion by 2007
mcmanamon pointed out that the corrosion cost increased to USD 3.8 billion mainly due to the increase of maintenance labor cost and the increase of commercial depot maintenance cost
he further pointed out that the main reason for the decline in corrosion costs in 2007 was the decline in labor costs caused by the decommissioning of 16 ships. Although the increase in the cost of maintenance in commercial bases and in organic field operations led to a moderate increase in corrosion costs, the overall cost was reduced
mcmanamon pointed out that so far, no ship has canceled its mission due to corrosion
however, according to Katie Roberts, spokesman of the naval maritime systems command, the pattern of the vanadium industry in the past two years has undergone fundamental changes. In the past years, the three US Navy ships: "Perry" class missile frigates "klakring" and "Hawes" and the amphibious assault ship "Nassau" have suffered from corrosion problems, However, the naval maritime systems command has imposed many restrictions on actions, such as limiting the speed of ships under specific sea conditions
mcmanamon pointed out that the thinning of the hull caused by corrosion has become a serious problem on some frigates. The navy is studying the decommissioning of three to four Perry class missile frigates each year for the next five years. He also disclosed that there is a study that lists 18 areas that need attention on the frigate, and has developed a new PMS preventive maintenance system card to protect those areas that are vulnerable to corrosion
through the comprehensive application of plans, procedures and technologies, the navy is actively declaring war on corrosion
Weigand said: the bottom of the box should be higher than the ground. "In the long run, we still need to work hard to better understand our surface ship maintenance needs and come up with better technical solutions." "The establishment of the new surface ship life cycle management activity (sslcma) is to achieve this goal. In order to enable the ship to service its life years in a proper state, we need to identify the maintenance needs to be met in different periods, so as to ensure that the ship can perform well throughout its design service life cycle."
he said: "what we need then is to obtain sufficient funds through the budget process. This can be said to be the longest-term challenge we face in maintenance. A large number of US Navy ships have reached the middle of their service life. In the short term, the challenge we face is how to keep the ships in good combat readiness and ready to perform various tasks when the budget is often insufficient."
the service cycle management department of surface ships was established in May, 2009. At the beginning of its establishment, the Department had only 20 staff. Now, with the expansion of the organization, the staff has reached 58
Weigand said: "the naval maritime systems command has established the corrosion control assistance teams, whose task is to use technical expertise and special equipment to help ships cope with corrosion."
two years ago, the naval maritime systems command launched a plan to jointly investigate the structure and corrosion of ships with the ABS American Bureau of shipping. Mcmanamon pointed out that most of these investigations focused on bilges, liquid tanks (such as fuel tanks and sea water ballast) and empty tanks (without any purpose, they are just part of the structure of the ship). These investigations investigated the causes of corrosion phenomena such as steel thinning. According to the plan, four ships have completed the investigation, and another 10 ships are under investigation, which is expected to be completed in 2010
mcmanamon said: "the objective of our investigation is to tell the Secretary of naval operations whether the ship originally designed for a service life of 30 years can really serve for 30 years, and whether it will cause such a situation because of maintenance and operation difficulties: the equipment on the ship can still serve for 14 years, while the ship has only a service life of 6 years."
Weigand said: "in the past three years, the US Navy has established a huge tank and empty tank database to timely record the tank structure and corrosion. This database will be used for future maintenance plans."
Maj. Gen. mcmanamon said: "the data investigated by the US Bureau of shipping are gradually being handed over to us. All our engineering level maintenance plans and all the data of the preventive maintenance system have made our service life cycle management of surface ships to a higher level."
the inspection plan for liquid tanks and empty tanks initially only involved aircraft carriers and other ships at Norfolk Naval Base in Virginia, but later expanded to a variety of ships on the East and west coasts of the United States. It has become an integral part of the overall service life cycle management of US Navy surface ships
mcmanamon said: "we can see that after the first ship was properly maintained at the right time, the cost of $271000 was saved, and the cost-effectiveness of maintenance is very high."
he pointed out that it is very important for the service life cycle management of ships to closely track and master the anti-corrosion work of ships, such as frequent inspection of liquid tanks and empty tanks. If the status of liquid tanks and empty tanks of the ship can not be grasped in time, the problems that can be easily handled may become troublesome. The U.S. Navy is now using a software project to track the status of each ship's hull, compile a tank status database according to the ship's side number, and carry out timely repair and maintenance
major general mcmanamon said: "I am seeking to integrate this plan into a first-class maintenance plan. Only in this way can we make the active ships in good service. On the other hand, I also need to meet the needs of system production. If I can do these two points, I can keep the cost of corrosion at a low level."
the naval maritime systems command has developed and implemented a corrosion control tank and void preservation field plan for dock landing ships. In the next seven months, the plan will be extended to the entire surface fleet of the Navy
weigander disclosed that the U.S. Navy is conducting experiments on high-solid paints and single coat paints
he said: "spraying is one of the most expensive corrosion control measures."
two years ago, the naval maritime systems command established a painting center of excellence, which gathered experts from local naval laboratories to develop new coatings and anti-skid measures
mcmanamon pointed out that the latest painting standard of the naval maritime systems command requires the use of single cover, high solid epoxy paint to paint ballast tanks, empty tanks and anchor chain tanks. He also pointed out that after using this new coating, the cost can be reduced by 20% to 30%, and the ship can be used in good condition for 20 years
mcmanamon pointed out that in order to facilitate metal maintenance, the ship's liquid tanks usually use relatively cheap three-layer coating. After the paint dries, the workers will check the thickness to ensure that the paint does not melt and that there is no missing blank area
he said: "the single coating high solid state coating is a very special material. This material is thinner, but has greater strength, so we only need a single coating, spray once, and only need to check the spraying quality."
he said: "the problem with using this coating is that workers must be very careful during operation. Because this coating dries too fast, it is impossible for workers to check the uncovered area and spray it again and again. In a sense, it is a coating that only needs to be sprayed once."