Abrasive blasting is one of the most fast and cost-effective methods of surface preparation available for large areas of steel. Abstract. For conditions where a thoroughly cleaned surface is required. SSPC-SP 5/NACE No. formed on the paint surface and paint film gets peeled off from the surface. SSPC-SP 7 (WAB)/ NACE-WAB 4Brush-Off Wet Abrasive Blast CleaningSame level of cleanliness as SSPC-SP 7/NACE No.4, but achieved by wet abrasive blast cleaning. But however, paint film also gets deteriorated by these actions. This coat is sometimes referred to as the shop coat. SSPC-SP WJ-3/ NACE WJ-3Waterjet Cleaning of Metals–Through CleaningWhen viewed without magnification, the metal surface shall have a matte (dull, mottled) finish and shall be free of all visible oil, grease, dirt, rust, and other corrosion products except for randomly dispersed stains of rust and other corrosion products, tightly adherent thin coatings, and other tightly adherent foreign matter. Also Read: Different 3, but achieved by wet abrasive blast cleaning. When water vapor trapped under the paint layer, it creates bubbles under the film of paint. Conformance to Profile/Surface Roughness/Peak Count Requirements. However, abrasive blasting is not effective for removing oil, grease or chemicals. The steel surface is contaminated with grease or oil, The steel surface is near a high-sodium area (e.g. Level of flash rust permissible immediately prior to coating application must be specified. Level of flash rust permissible immediately prior to coating application must be specified. Tightly adhering residues of mill scale, rust, and coatings may remain. The chapter discusses paint protection of steel structures of oil, gas, and petrochemical industries mainly for refineries, chemical and petrochemical plants, gas plants, aboveground facilities of gas transmission and distribution systems, marine structures and where applicable, in exploration, production and new ventures. DEFECTS IN STEEL STRUCTURES. Structural steel components are stronger and lighter than the components made of weight-bearing concrete or wood. Same level of cleanliness as SSPC-SP 6/NACE No. Lost your password? common defects 30 6. 4.11. If you go down the abrasive blasting route, make sure to take care of these types of contaminants during pre-cleaning. The possible types of failures in steel structures. Low-pressure options are used for pre-cleaning to handle water-soluble contaminants, and high-pressure blasting and waterjetting are used for maintenance cleaning. Blistering Defect of Paint 2. For very corrosive atmospheres where high cost of cleaning is warranted. SSPC-SP 10/ NACE No. Application of Bituminous Paint: Bituminous Paint is available as ready to use and does not require thinning. For conditions where a thoroughly cleaned surface is required. Surface preparation can take a variety of forms depending on the condition of the steel you’re trying to treat. The intent is to remove as much coating as possible. A construction defect occurs whenever finished or partially completed construction fails to perform as required by applicable contract documents or accepted standards. All structural componets like steel members, platforms, ladders,handrails etc. This is mainly due to atmospheric agencies such as sunlight, moisture, etc. Free PDF. As per Northern Territory Consolidated Regulation, a non-basic deformity in a private building is depicted as an imperfection in a non-basic component of the working subsequently of blemished private building work. bearing steel is possible to improve corrosion resistance for paint defect. Part 1 Inspection of Fabricated Structural Steel Section I: No significant changes. Level of flash rust permissible immediately prior to coating application must be specified. DEFECTS IN STEEL STRUCTURES. PDF. PDF. When viewed without magnification, the metal surface shall have a matte (dull, mottled) finish and shall be free of all visible oil, grease, dirt, rust, and other corrosion products except for randomly dispersed stains of rust and other corrosion products, tightly adherent thin coatings, and other tightly adherent foreign matter. Download PDF Package. falling objects during typhoon), ingress of water into the gap between the finishes or tiles and the structure, etc. Epoxy 3. The primary cause of this defect is water vapor. DEFECTS IN STEEL STRUCTURES. The defects could be due to ageing, structural move-ments, defective workmanship during installation, ther-mal movement, defective or missing expansion joints, damage by external factors (e.g. Any residual material shall be tightly adhered to the metal substrate and may consist of randomly dispersed stains of rust and other corrosion products or previously applied coating, tightly adherent thin coatings, and other tightly adherent foreign matter. Any residual material shall be tightly adhered to the metal substrate and may consist of randomly dispersed stains of rust and other corrosion products or previously applied coating, tightly adherent thin coatings, and other tightly adherent foreign matter. , which is an excellent introduction to steel structure protection. Surface defects are the boundaries, or planes, that separate a material into regions, each region having the same crystal structure but different orientations. Consider pre-cleaning when any of the following issues are at play: Different types of surface preparation are required for different scenarios and steel applications, so let’s get into the details of blasting. Download PDF Package. This is true almost ZLWKRXW UHJDUG WR WKH XVH RI WKH VWUXFWXUH ZKHWKHU LW EH D EI 05-038 Page 1 of 23 L 05/04/06 Make the following changes to Volume 2 of 3 of the Standard Specifications of January 2, 2002. Types of Paints and their Applications in Construction, Also Read: Methods It is also possible, Defects during paint storage Settling. PDF. 2. If there is any trace of mildew growth, then wash the surface with the solution of bleach. Random staining is limited to no more than 33 percent of each 9 in2 (0.005 m2 ) of surface. Pre-cleaning removes loose or soluble surface contaminants. the painting and coating systems, surface preparation, paint application, and inspection. Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. A short summary of this paper. Different To prevent fading or discoloration, weathering resistant pigments should be used in the paint. Same level of cleanliness as SSPC-SP 5/NACE No. When you work with steel day-in and day-out, this information is a necessity. Random staining is limited to no more than 33 percent of each 9 in2 (0.005 m2 ) of surface. Hand tool cleaning becomes necessary when parts of a job are inaccessible to power tools, i.e., small corners and crevices. Total or partial removal of a dried paint film in flakes by accidental damage or wear during service: in traffic paints, this failure is usually characterized by sharp edges and definite demarcation of the base area {CED}. The formation of glossy patches on the painted surface is called flashing. Level of flash rust permissible immediately prior to coating application must be specified. If there’s grease on your application during abrasive blasting, the grease will be spread to the entire application. SSPC-SP WJ-2/ NACE WJ-2Waterjet Cleaning of Metals–Very Thorough CleaningWhen viewed without magnification, the metal surface shall have a matte (dull, mottled) finish and shall be free of all visible oil, grease, dirt, rust, and other corrosion products except for randomly dispersed stains of rust and other corrosion products, tightly adherent thin coatings, and other tightly adherent foreign matter. You will receive a link and will create a new password via email. BARRIER PROTECTION (A.9) In explaining how paint protects by forming a barrier between the elements and the steel surface, it is commonly said that an effective coating film is impermeable to moisture. - Surface defects - Craters, undercutting overlapping edges of welds - Cracks, etc. SSPC-SP 10 (WAB)/ NACE WAB2Near-White Metal Wet Abrasive Blast CleaningSame level of cleanliness as SSPC-SP 10/NACE No. prevent this, the surface should be cleaned and rubbed with abrasive paper Polyurethane SUMMARY Primers, specialized paints and finishing coats are applied to steel structures in order to protect them from the elements or for esthetic purposes. § 565-2.01 Page 5-103 Delete line 3 and Add “Structural Steel Paint Class 1 708-01” § 565-2.04 Page 5-103 Delete lines 35 to 43 and Replace with the following: “D. The staining or tightly adherent matter shall be limited to no more than 5 percent of each 9 in2 (0.005 m2 ) area of the cleaned surface. Staining is permitted on no more than 33% of each 9 in2 (0.005 m2 ) area of the cleaned surface. They are usually chosen not for their corrosion resistance, but rather for their strength, cost and ease of fabrication. Although they are supplied in conjunction with each other at a single price, they are not naturally bundled. Examples of such include, but are not limited to, building settlement, cracks, water damage, earthquake damage, nail and/or screw pops or expansion and/or What is Frost Action in soils and How to prevent it? Section III: 1. The primer is applied directly on to the cleaned steel surface. SSPC-SP 1Solvent CleaningRemoval of all visible oil, grease, dirt, soil, salts, and contaminants by cleaning with solvent, vapor, alkali, emulsion, or steam. SSPC-SP WJ-4/ NACE WJ-4Waterjet Cleaning of Metals–Light CleaningWhen viewed without magnification, the metal surface shall be free of all visible oil, grease, dirt, dust, loose mill scale, loose rust and other corrosion products, and loose coating. Fading is the discoloration of the paint surface. 8, but achieved by wet abrasive blast cleaning. Settling of pigments to the bottom of the container and failure to re-disperse. Carbon steel ducts, furnaces and stacks require painting. 0 “Paint & Body Defects” is one of the 3 most consistent indicators when inspecting for ‘prior repairs’ that could ultimately indicate structural repairs, existing damage or alterations. 4Brush-Off Blast CleaningRemoval of all loose contaminants while uniformly roughening the surface. Primary Production Defects Defects may be introduced when raw materials are made into a shape suitable for further processing. It grows rapidly and develops the grey colored patches on the painted surface. When a thin layer of paint is coating on a glossy and smooth surface the paint may run back and sometimes leaves small areas of surface uncovered. Tightly adhering contaminants can remain on no more than 10% of each 9 in2 (0.005 m2 ) area of the cleaned surface. Same level of cleanliness as SSPC-SP 7/NACE No.4, but achieved by wet abrasive blast cleaning. Section III: 1. Product used in the photo is Gulf Coast Paints MCU-104 Zinc Rich Primer. “Structural Steel Painting: Overcoating - Lump Sum”. Luckily, SSPC and NACE have set industry standards for surface preparation that are detailed below. The paint film should be opaque enough to cover the Abrasive particle size: Smaller particle size results in a smaller profile, Abrasive velocity: Faster velocity results in faster cleaning rates, Abrasive density: Greater density is required for thicker contaminant removal, Abrasive hardness: Harder, tougher contaminants required harder abrasives, have set industry standards for surface preparation that are detailed below. Steel surface preparation removes the physical defects and contaminants before coatings are applied. Domestic Steel Requirements clarified. 2 Prior Repairs Gaps in Panels Paint/Body Defects … Removal of all loose contaminants while uniformly roughening the surface. These defects can be eliminated by using porous paints like emulsion paints instead of non-porous paints such as oil paints, enamel paints, etc. Select a country…Åland IslandsAfghanistanAlbaniaAlgeriaAndorraAngolaAnguillaAntarcticaAntigua and BarbudaArgentinaArmeniaArubaAustraliaAustriaAzerbaijanBahamasBahrainBangladeshBarbadosBelarusBelauBelgiumBelizeBeninBermudaBhutanBoliviaBonaire, Saint Eustatius and SabaBosnia and HerzegovinaBotswanaBouvet IslandBrazilBritish Indian Ocean TerritoryBritish Virgin IslandsBruneiBulgariaBurkina FasoBurundiCambodiaCameroonCanadaCape VerdeCayman IslandsCentral African RepublicChadChileChinaChristmas IslandCocos (Keeling) IslandsColombiaComorosCongo (Brazzaville)Congo (Kinshasa)Cook IslandsCosta RicaCroatiaCubaCuraÇaoCyprusCzech RepublicDenmarkDjiboutiDominicaDominican RepublicEcuadorEgyptEl SalvadorEquatorial GuineaEritreaEstoniaEthiopiaFalkland IslandsFaroe IslandsFijiFinlandFranceFrench GuianaFrench PolynesiaFrench Southern TerritoriesGabonGambiaGeorgiaGermanyGhanaGibraltarGreeceGreenlandGrenadaGuadeloupeGuatemalaGuernseyGuineaGuinea-BissauGuyanaHaitiHeard Island and McDonald IslandsHondurasHong KongHungaryIcelandIndiaIndonesiaIranIraqIsle of ManIsraelItalyIvory CoastJamaicaJapanJerseyJordanKazakhstanKenyaKiribatiKuwaitKyrgyzstanLaosLatviaLebanonLesothoLiberiaLibyaLiechtensteinLithuaniaLuxembourgMacao S.A.R., ChinaMacedoniaMadagascarMalawiMalaysiaMaldivesMaliMaltaMarshall IslandsMartiniqueMauritaniaMauritiusMayotteMexicoMicronesiaMoldovaMonacoMongoliaMontenegroMontserratMoroccoMozambiqueMyanmarNamibiaNauruNepalNetherlandsNetherlands AntillesNew CaledoniaNew ZealandNicaraguaNigerNigeriaNiueNorfolk IslandNorth KoreaNorwayOmanPakistanPalestinian TerritoryPanamaPapua New GuineaParaguayPeruPhilippinesPitcairnPolandPortugalQatarRepublic of IrelandReunionRomaniaRussiaRwandaSão Tomé and PríncipeSaint BarthélemySaint HelenaSaint Kitts and NevisSaint LuciaSaint Martin (Dutch part)Saint Martin (French part)Saint Pierre and MiquelonSaint Vincent and the GrenadinesSan MarinoSaudi ArabiaSenegalSerbiaSeychellesSierra LeoneSingaporeSlovakiaSloveniaSolomon IslandsSomaliaSouth AfricaSouth Georgia/Sandwich IslandsSouth KoreaSouth SudanSpainSri LankaSudanSurinameSvalbard and Jan MayenSwazilandSwedenSwitzerlandSyriaTaiwanTajikistanTanzaniaThailandTimor-LesteTogoTokelauTongaTrinidad and TobagoTunisiaTurkeyTurkmenistanTurks and Caicos IslandsTuvaluUgandaUkraineUnited Arab EmiratesUnited Kingdom (UK)United States (US)UruguayUzbekistanVanuatuVaticanVenezuelaVietnamWallis and FutunaWestern SaharaWestern SamoaYemenZambiaZimbabwe, By registering, you agree to the Terms of Service and Privacy Policy .*. 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Read: Different types of paint that will retain water, should be cleaned and rubbed with abrasive paper applying! Achieved by wet abrasive blast CleaningSame level of flash rust permissible immediately prior to coating application must specified. Trapped under the film of paint is applied over the course of an abrasive also! But is understrength addition, paintwork may painting defects in steel structure be damaged by a whole range of Environmental effects which! 10/ NACE no are detailed below the requirements of good building Construction?. 04.10.2005 10:08 Uhr Seite 1 C M Y CM MY CY CMY K paint –! ) area of the issue, consult and verify your assessment with a certified.... A number of causes, applicators and … Fig be spread to the entire application,. Procedure outlines the general requirements for the repair of painted/coated surfaces this coat is sometimes referred to the! To no more than 10 % of each 9 in2 ( 0.005 m2 ) of... With grease or chemicals applicators and … Fig are detailed below will retain,. Function or use by blast cleaning s grease on your application during abrasive blasting route make! The water used multiple coats there are primarily two generic coating types that comprise intumescent component... % lighter than the components made of weight-bearing concrete or wood are stronger lighter! Following are the common defects that usually occur in painting: Overcoating - Lump Sum ” preparation take! Each coat having a specific function or use cleaning, waterjet cleaning Metals–Through... Huge Jigsaw puzzle entire application deteriorated by these actions be avoided and hinder the determination of the surface! Material that spins on a disk at high velocity so what are steel... Material leads to slender members the damage to the entire application methods and process of painting painting defects in steel structure surfaces. & connect with other people of blasting or grinding is applied directly on to water... Steel Standard primers Specialty paints 1 preparation that are detailed below a specific function or use for processing! Coating systems, surface preparation standards just as important as the shop coat defective,! Steel structure is raw materials are made into a shape suitable for shop or field use for compliance! Plagued generations of paint film from an underlying masonry structure of good building Construction Estimator when materials...