The hottest new standard for direct surface coatin

2022-08-23
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The 82nd International Maritime Organization (IMO) sea safety meeting unanimously adopted the "performance standard of protective coating for seawater ballast tanks and double sides of bulk carriers for all types of ships" in the anxious eyes of the ship industry. The standard will be compulsorily applicable to the special seawater ballast tanks of all ships with a gross tonnage of more than 500 and the double side spaces of bulk cargo ships with a height of more than 150 meters that have signed construction contracts after July 1, 2008. If there is no construction contract, ships with keels laid after January 1st, 2009 or ships delivered after July 1st, 2012 must comply with this standard

The introduction of the new coating standard will undoubtedly arouse thousands of waves, and will become an important restrictive factor for the development of China's shipbuilding industry in the future; However, it should also be noted that since China's shipbuilding industry has been in line with international standards, it has experienced many baptisms, responded to challenges with a positive attitude, and achieved brilliant sublimation

introduction -- safeguard China's interests to the greatest extent

the corrosion of hull structures, especially the corrosion of sea water ballast tanks, is one of the important factors affecting the safety of ship structures. Some major ship accidents are caused by the sharp decline of structural strength caused by the serious corrosion of ballast tanks. Therefore, this issue has been concerned by IMO. since the 76th IMO Maritime Safety Conference in December 2002, it has decided to formulate a mandatory ballast tank coating standard

because the standard will involve different interests in shipping and shipbuilding, the two sides representing different interests have great differences on the technical requirements in the standard during the formulation process. As the chairman of the communication group, China Classification Society, under the leadership of the Ministry of communications, early intervened in this work and timely informed the Chinese shipbuilding industry of relevant information, which promoted the attention of the Chinese shipbuilding industry to the formulation of this standard. In the process of the formulation of this standard, a mechanism for the Chinese shipbuilding industry to systematically participate in the formulation of relevant shipbuilding standards in IMO was formed

China has held more than a dozen working meetings to study the Countermeasures in the formulation of standards, organized and participated in four coordination meetings on shore hardness, sometimes called international rubber hardness ship boundary coating standards made in China, Japan and Korea, and submitted Chinese proposals on the application scope of standards, pre cleaning, soluble salt limitation on steel surface, surface dust and surface treatment after closure, as well as the mandatory implementation date of standards Proposals on coating maintenance and leftover technical problems, and sent experts to attend relevant meetings of the Chinese delegation, which played an active role in the working group and the expert group, and achieved the following results: excluding empty tanks from the scope of application of the standard; The pre washing requirements in the original draft are deleted; The soluble salt content on the steel surface is relaxed from less than 30mg/m2 to less than 50mg/m2; As for the applicable date of the amendment to the Convention, the "date of signing the construction contract" is used as the applicable date of the coating standard; After the ballast tank is closed, the steel surface treatment is changed to allow large joints to be polished with tools; The requirements for the correction of steel surface roughness in the original ISO standard are canceled, avoiding the situation that most shipyards in China may need to add an additional coating due to the original correction requirements

through the efforts of the Chinese delegation, it not only avoided the situation that the requirements of the original draft would make almost all domestic shipyards face great difficulties, but also won valuable preparation time of about two years for domestic shipyards. The most atmospheric gel insulation board has high temperature resistance and thermal conductivity. In many cases, the destruction of a partial part of the experimental machine led to the failure of the experimental machine, low density, high strength, green environmental protection Water proof and non combustible properties may safeguard the interests of China's shipbuilding industry

impact -- the national shipbuilding industry is facing competition for strength

at present, the actual situation of general coating in domestic shipyards is far from the requirements of the new coating standard. To meet the requirements of the new standard, greater investment and improvement are needed

according to the preliminary investigation and analysis of the main shipyards and some local backbone shipyards belonging to the two major shipbuilding groups in China, if China's shipyards implement the standard under the existing conditions, the national shipbuilding output may be reduced by more than 20%

for the implementation of this standard, due to the large scale of shipbuilding enterprises in Japan and South Korea, advanced shipbuilding facilities (equipment), modes and processes, and high management level, although the implementation of this standard will bring some problems, each shipyard can basically meet the requirements of the coating standard with a little effort. However, the number of shipbuilding enterprises in China is large, the scale is small, and the technology and management are relatively backward. The difficulties encountered in implementing this standard are much larger than those of shipyards in Japan and South Korea

for the large state-owned backbone shipyards affiliated to the two shipbuilding groups, due to the relatively good shipbuilding facilities and management level, although the standard brings some difficulties, it can be achieved through efforts on the whole, but the output has decreased

for a large number of small and medium-sized shipyards, the implementation of the new coating standard may be a life and death test. Due to certain shipbuilding facilities, some medium-sized backbone shipyards have relatively high management level, but lack of capacity in special workshops and equipment for sand blasting and spraying, which will greatly prolong the production cycle. The production cycle of segmented processing and general assembly stage in some shipyards may increase by more than 50%, which is bound to seriously affect the output of these shipyards, increase the cost burden and reduce the benefits, It will directly threaten the survival and development of the shipyard; For small and medium-sized shipyards with seriously insufficient production facilities, if they do not increase investment to solve the necessary production conditions, change the shipbuilding mode and improve the necessary construction technology, it will be difficult to meet the requirements of this standard, and they may have to withdraw from the market of building ships for international navigation

the implementation of this coating standard involves not only the coating and coating itself, but also shipbuilding hardware facilities, shipbuilding mode and shipbuilding process flow, coating and coating process, experimental testing equipment, coating and coating inspection and approval, verification and inspection institutions, inspectors' testing qualifications and approval institutions for various products to touch the tightening force, etc. It is estimated that the investment needed to establish sand blasting and spraying plants and equipment with an annual output of 10000 tons of ships alone will reach 10000 yuan

in a word, shipyards must face the competition of input, improvement and technology in order to successfully pass the test in the new shipbuilding environment

Countermeasures -- help the ship industry adapt to the changes in standards

how to organize the implementation of this new international standard is of great importance to China's shipbuilding industry. Experts suggested that a joint working mechanism should be established within the framework of the major maritime coordination mechanism between the Commission of science, technology and industry for national defense and the Ministry of communications to study and digest relevant international standards. Within two years, the technical conditions for ballast tank coating, guidelines for inspection and approval of coatings and coatings, and the damaged surface of ballast tank coating should be organized and completed

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