Sharp edges, weld seams, corners and other areas that are likely to receive less dry film thickness than specified, should be stripe coated. In many instances, steelwork will be in a warm dry interior where it will not corrode, and the structural stability of the building will not be threatened during its design life generally taken as 50 years. For example in the country. The substrate must be dry and free from salts and other contaminants. Coastal areas with low salt content. Please read the actual product datasheet for more information.
. C5M: Maritime Coastal e nvironment and off-shore installations with high salt content Buildings and areas with a high degree of condensation and with high impact of pollution. Internal corrosion protection of bearing beams Corrosion c ategories acc. For example, warehouses, depots, sport facilities and similar. For example, industrial plants , laundries, breweries , food production , etc. None C2 Low Buildings not heated, where condensation may occur, such as warehouses and sports halls. General principles of design and corrosion resistance.
However, where steelwork within the cavity is deemed to be in a more aggressive environment category, the application of a high build bitumen coating at 150µm to the faces of the steelwork within the cavity may be applied before or during construction. C5-M Typical coating system Condition: A high durability coating system for environmental conditions classified as C5 M-very high corrosivity marine. C4 High Chemical manufacturers, swimming baths and ship- and boatyards by the sea. Coastal areas with low salinity Production areas with high humidity and some air pollution. Mainly rural setting Unheated buildings where condensation can occur.
Higher risk categories for interior environments e. Guidelines and recommendations for the protection against corrosion of iron and steel in structures. Indefinite 2 Transpoxy Masterbond Epoxy polyamine 83 125 6. Deacon 2002 , Steelwork Corrosion Control 2nd edition , Spon Press. For example, 80µm can be in one coat or as 20µm prefabrication primer plus 60µm post-fabrication primer. Industrial areas and coastal areas with moderate salt impact. C3 Middle Buildings for production with high atmospheric humidity and some air pollution such as food manufacturers, breweries, dairies and laundries.
It is the expected life, in years, before first major maintenance. C3: Medium City and industrial environments with moderate sulfur dioxide pollution. Tuto normu nelze objednat, jelikož byla zrušena. It is important that the steelwork is thoroughly degreased and free from any contamination. Visible steelwork will normally be accessible for maintenance and if repainting is carried out the quoted structure life will be extended.
Visual assessment of surface cleanliness. For steelwork that is visible, the should be surface treated and coated as shown. C5-M Very high Buildings or areas with almost permanent condensation and with high pollution. In such conditions classified as C1 no corrosion coating is required. The tables give two figures for durability: Structure life The period of reasonable freedom from severe corrosion of the steelwork that might lead to weakening of the structure.
For further information regarding prices, availability and technical information consult your Transocean Coatings representative. C4 and C5 are not covered in this article and users are advised to seek specialist advice if their project involves such situations. This article is designed to assist those responsible for either drafting corrosion protection specifications, or as contractors with a requirement to meet that which is specified. For example, 80µm can be in one coat or as 20µm prefabrication primer plus 60µm post fabrication primer. All products and advices are subject to our standard terms and conditions of sale, which are available on request.
In such cases, a coating system appropriate to the environment category should be provided. It is important that the manufacturers' instructions are carefully followed to ensure successful results. The life of the total protection system without maintenance should exceed 25 years, however, it is anticipated that for aesthetic reasons maintenance will be carried out at periods of 10 years or less. Some types of buildings, such as may fall into any of the above categories or combinations of them depending upon their location, design and construction. C5-I Very high - Industry Buildings or areas with almost permanent condensation and with high pollution. C2: Low Environments with low levels of polution. Coast and offshore areas with high salt content.
Examples include steelwork inside dry buildings with neutral atmospheres such as , , , hotels, , airport terminals, and , etc. The treatment specified for cavity wall condition should also be suitable for the interior environment of the building. For more details about the use of the stated products, refer to the relevant product data sheet. Remove weld spatter and smooth weld seams and sharp edges as applicable. Where colour stabilization is required for appearance purposes, this can be achieved by the application of the finish coat in this system. After treatment, the solution should be rinsed off with clean water and then the treated surface dried ready for painting. The protective systems in the tables have unique identities.
Coating life The expected period to maintenance of the protective coating. Hidden steelwork is assumed to be not accessible for maintenance, thus a figure for coating life of hidden steelwork systems is not applicable. It should be noted that this does not imply a guarantee of life expectancy. Should the internal environment be more aggressive, additional protection will be required. For example, 80µm can be in one coat or as 20µm prefabrication primer plus 60µm post fabrication primer. In some regions, stainless steel may be required for embedded members by local regulations or be deemed necessary to provide adequate durability.