The Chinese version of standards has precedence to their English translations which are only for internal reference.本英文版為內(nèi)部資料，僅供參考，以中文版為準(zhǔn)。Trade Standards of Peoples Republic of China中華人民共和國行業(yè)標(biāo)準(zhǔn)PSH 3022-1999Technical specification for the coating anticorrosion of equipment and piping in petrochemical industry石油化工設(shè)備和管道涂料防腐蝕技 術(shù) 規(guī) 范1999-09-22 issure2001-01-01 enforcementissured by National Petroleum & Chemical Industrial BureauIntroductionThis technical specification is a revision from “Design & construction specification for the coating anticorrosion of equipment and piping in petrochemical industry” SHJ22-90, revised jointly by Lanzhou Design Institute and The Third constructional Company, SINOPEC, according the construction marking-up Document 269 (1995), SINOPEC.This Technical Specification includes five sections and six appendixes. The contents, which have been revised, are:1. Raising rust-removing grade for steel materials surface for a longer using life of anticorrosive coating.2. Classifying corrosion degree jointly using methods of quantitative and qualitative analysis3. Increasing quantitative control of total thickness of anticorrosive coating4. Increasing or cutting kinds of normal coating and their complete performances5. Enhancing monitoring and controlling for coating product quality, perfecting controlling of coating process application6. Establishing strict and definite specification for coating engineering quality (e.g.coating thickness, coating course, etc.)During the time of revising, problems existing in the original revision were more widely investigated, and practical experience were concluded about design and application for the coating anticorrosion of equipment and piping in petrochemical industry, suggestions were collected about design, construction, production etc. After some of the important points were discussed many times, and finally, the audit evaluation, the new version were produced.If there are any points needing revision during your carrying out this specification, please provide your suggestion as well as the related information to the editor-in-chief unit for reference of further revision.Editor-in-chief address:Fuli west street No.1,Xigu, lanzhou city, GansuPostcode 730060Box 60,Zhenghai, Ningbo city, ZhejiangPostcode 315207Editor-in chief unit of the specification:Lanzhou Design Institute, SINOPECThe Third Constructinal Company,SINOPECChief draftsman:Xuyanbing, Baicaiqing, Zhanyanchan, Wangshande Contents1. General42. Expressions, Terms43. Design53.1 General specification53.2 Surface treatment83.3 Anticorrosion for on-ground equipment and piping 93.4 Anticorrosion for buried equipment and piping114. Construction134.1 General specification 134.2 Surface treatment and examination before coating144.3 Anticorrosion construction for on-ground equipment and piping174.4 Anticorrosion and construction for buried equipment and piping 214.5 Safety protection245. Evaluation and acceptance245.1 General specification245.2 Evaluation and acceptance of anticorrosion engineering foron-ground equipment and piping255.3 Evaluation and acceptance of anticorrosion engineering forburied equipment and piping26Appendix A Classification of corrosive substance in atmosphere29Appendix B Normal anticorrosive coating for equipment and piping31Appendix C Estimation of coating use level52Appendix D Normal qualification of anticorrosive coating for equipment and piping53Appendix E Qualification of vinly etch primer64Appendix F Cause of defects in coating operation and preventing measure651. General1.0.1 The Specification applies to coating anticorrosion for exterior surface of steel equipment, piping and their accessory steel structure in petrochemical industry.The Specification is not suitable for outside surface coating anticorrosion of equipment and piping having surface temperature exceeding 500°C.Surface of equipment and piping and coating anticorrosion for long transfer piping are not included in the specification.1.0.2 When the specification being carried out, it should be done according to the current related mandatory standards specification.2. Expression, Terms2.0.1 Coating Total name of a kind of liquid or solid material used in coating object surface forming solid coating film having functions of protecting, trimming or other special qualities (e.g.insulation, anticorrosion etc.).In names of concrete coating varieties, “Paint” can be used to prefer to “coating”, such as anticorrosive paint, acid-resisting paint, etc.2.0.2 Paint filmContinuous film formed by coating object surface uniformly using paint, consisting of one or several coating layers.2.0.3 Varnish A kind of paint not having coloring agent, usually used as top coat forming transparent paint film having protection, trimming and other special functions.2.0.4 Enamel A kinds of paint forming hard and flush and smooth paint film usually similar to enamel in appearance after coating.2.0.5 Priming coatA kind of paint used directly to coat steel surface for multi-layer coating2.0.6 Surface A kind of paint used to correct non plain primer surface for multi-layer using.2.0.7 Intermediate coat Intermediate coat existing between surface and top coat having its main function of increasing thickness of anticorrosion coating layer and being able to bind with both priming coat and top coat.2.0.8 Top coat Top coat used to coat uppermost layer for multi-layer coating, needed one or two courses generally. 2.0.9 Adherend Adhernd mainly includes welding slag, spatters, solubal salt, oil and fat, soil, oxide layer, rust, aged coating ,etc. 2.0.10 Covering power Give one course of coating uniformly on object surface till the surface completely being covered without showing original state, now the gram of used paint called as masking power, unit: g/m2.2.0.11 Adherence Adherence means firmness of binding painting film and coated material through physical and chemical reaction of force on the surface of these two substance. Generally expressed as “grade”.2.0.12 Slightly soluble medium Slightly soluble medium means medium of alkali and salt having solubility of less than 2g/L in water at the temperature of 20.2.0.13 Soluble medium Soluble medium indicating medium of alkali and salt having solubility of equal or more than 2g/L in water at the temperature of 20.2.0.14 Slightly hygroscopic mediumSlightly hygroscopic medium means medium of alkali and salt having relative equilibrium moisture equal to or of more than 60% at the temperature of 20.2.0.15 Hygroscopic medium Hygroscopic medium means the medium of alkali and salt having relative equilibrium moisture of less than 60% at the temperature of 20.3. Design3.1 General specification3.1.1 Selecting point should obey the following rules: Conforming to operating conditions of object to be coated. Conforming to material quality of object surface coated. Well-matching of various layers paints Safe reliability, economic rationality. Satisfying essential requirements of construction.3.1.2 Surface of equipment, piping and their accessory steel structures, which are made of carbon steel and lean alloy should be paint-coated.3.1.3 Priming coat of adherence grade measured according to the current national standard “Measurement of Paint Film Adherence” GB/T1720 ought to be used as priming coating on steel materials surface.3.1.4 Except other design stipulated standard, coating should not be done under the following conditions: Surface of austenite stainless steel Galvanized surface Polished surface Plastic-coated surface or chameleon paint-coated surface Name plate, marking plate or docket 3.1.5 Standstill equipment, piping and their accessory steel structures made by manufactures are required to be coated with priming coat, according to design specification.3.1.6 The followings should be coated in fabricating yard: Equipment, piping and their accessory steel structures set-up in fabricating yard. Equipment, piping and their accessory steel structures, which have been coated with priming coat in manufacturing factories and need being shaved as well as coated with top coat in fabricating yard. Equipment, piping and their accessory steel structures, which have been coated with top coat and need supplemental coating of damaged location in fabricating yard.3.1.7 Buried equipment piping should be given anticorrosion coating.3.1.8 Corrosion on steel surface caused by corrosive substance from atmosphere may be classified into three kinds of deep-etching, moderate corrosion and weak corrosion according to their corrosion degree, see Table 3.1.8.3.1.9 Quality, usage, and matching scheme of normal coating anticorrosion of equipment and piping, see Appendix B.3.1.10 Estimated use level of coating, see Appendix C.Table 3.1.8 Corrosion degree on steel surface caused by corrosive substance from atmosphereCorrosive substance and acting conditionCorrosion degreeGradeActionRelative moisture of air (%)Deep etchingModerate corrosionWeak corrosionCorrosive gases< 606075> 75Acid fogInorganic acidLarge amount> 75Small amount> 75 75Organic acidLarge amount> 75Small amount> 75 75Particlesslightly solubleLarge amount< 60soluble, slightly hygroscopicsoluble hygroscopicslightly solubleLarge amount6075Soluble, slightly hygroscopicsoluble hygroscopicslightly solubleLarge amount> 75Soluble, slightly hygroscopicSoluble hygroscopicSpatterIndustrical waterpH > 3pH 3salt solutioninorganic acidorganic acidalkali solutiongeneral organic liquidNote: classification of corrosive gases, see Table A.0.1; sorts of particles, see Table A.0.2 mark “” in table shows the corrosion degree under existing conditions3.2 Surface Treatment3.2.1 Rust grade of steel surface should be determined by contrast with typical model photograph in Guo Biao (Chinese Standard) “Rust Grade and Rust-Removing Grade of Steel Surface Before Coating” GB 8923.3.2.2 Rust grade of steel surface are divided into four they are Grade A- surface of steel material completely covered with oxide skin without any rust Grade B- surface of steel material, on which rust and flake-off of part of oxide skin happened. Grade C- surface of steel material, on which oxide skin partly flaking off or being able to be scraped out caused by rusting, and a small amount of corrosive pitting happened. Grade D- surface of steel material, on which oxide skin completely flaking off caused by rusting, and an overall corrosive pitting happened.3.2.3 Rust-removing grades of steel material are divided into four grades, they are: St 2- thorough hand and power tool rust-removing.No visible grease and dirt or no adherend of loosen oxide skin, rust, paint skin ,and etc. on surface of steel material. St 3- extreme thorough hand and power tool rust-removing No visible grease and dirt or no adherend of loosen oxide skin, rust, paint skin ,and etc. on surface of steel material.This kind of rust- removing should be done more thoroughly than St 2, surface of ground exposure part ought to have metal brightness. Sa 2- thorough injection or slinging rust- removingNo visible grease and dirt on surface of steel material, adherend of oxide skin, rust and paint skin ,and etc. have been basically removed, the residue could be firmly adherent. Sa 2.5- extreme thorough injection or slinging rust-removingNo visible grease and dirt, adherend of oxide skin, rust and paint skin and etc. on surface of steel material, any residual trace should only be slight stain having spotted or striated state.3.3 Anticorrosion for on-ground equipment and piping3.3.1 Anticorrosive coating used for on-ground equipment and piping can be chosen according to Table 3.3.1.Table 3.3.1 Quality and Usage of Anticorrosive coatingSort of paintProperty andusage of paintPhenolic resinAsphalt Alkyd resinVinyl perchlorideOlefin resinEpoxy resinpolyurethaneElemental organic siliconrubberInorganic zinc-richGeneral anticorrosionResistance to Chemical atmosphereresistance to Organic acid Acid gasAcid fog×××Organic acid fume and droplet resistance××××resistance to Alkali×××resistance to SaltsResistance to OilGasoline, kerosene××lubricant×××Resistance to SolventHydrocarbon solvent××××Fat, ketone solvent××××××××Chlorating solvent××××××××Resistance to MoistureResistace to Water×Temperature resistance to ()Normal temperature100××××101200×××××××201350×××××××351500××××××××Weather resistance property××Adherence×Note: Mark “” in the Table indicate excellent quality, being recommended; “” indicate ordinary quality, able to be used; “×” indicate poor quality, unsuiable for using; “” indicate unsuiable coating for using because of price and construction, etc.3.3.2 Except the following conditions, heat-insulated equipment and piping should be coated by 1-2 courses of anticorrosion paint of phenolic or alkyd resin: Important insulating equipment and piping used in coastal and humidity area should be coated with high-temperature priming coat according to using conditions. Adhesive bitumen primer , petroleum asphalt or asphalt priming coat can be used to coat cold preservation equipment and piping, with suitable 1-2courses coating.3.3.3 Total thickness of anticorrosion coating for on-ground equipment and piping should be adapted to the specifications in Table 3.3.3.Table 3.3.3 Total thickness of coat dry film of on-ground equipment and piping (mm)Corrosion degreeTotal thickness of coat dry filmImportant or hard to repairing locationinsideoutsideDeep etching 200 250Increasing 1-2 coating courses Moderate corrosion 150 200Weak corrosion 100 120Note : Total thickness of paint film of high-temperature coating is 40-60m.3.3.4 Anticorrosion coating using life of on-ground equipment and piping should be adapted to the turn round of plant, less than two yeas are unsuitable.3.3.5 Requirement of rust-removing grade of priming coat for steel material surface should agree to specification in Table 3.3.5.Surface of steel material of rust grade D should be rust-removed by using injection or slinging.Table 3.3.5 Requirements of suface rust-removing grade of priming coat for steel materialPrimer sortRust-removing gradeDeep etchingModerate corrosionWeak corrosionPhenolic resinSa 2.5St 3St 3AsphaltSa 2.5 or St 3St 3St 3Alkyd resinSa 2.5St 3St 3Vinyl perchlerideSa 2.5Sa 2.5-Vinyl etchSa 2.5Sa 2.5-Bitumineus epoxySa 2.5St 3St 3Epoxy resinSa 2.5Sa 2.5-Polyurethane anticorrosiveSa 2.5Sa 2.5-Organic silicon heat-resistance-Sa 2.5Sa 2.5Chlorosulfonated polytheneSa 2.5Sa 2.5-AllopreneSa 2.5Sa 2.5-Inorganic zinc-richSa 2.5Sa 2.5-3.4 Anticorrosion of buried equipment and piping3.4.1 Rust-removing grade of surface of buried equipment and piping ought to be Grade St 3.3.4.2 Rust-removing grade should be determined according to Table 3.4.2 based on soil corrosion grade.Table 3.4.2 Grades of soil corrosion and anticorrosionSoilSoil corrosion qualityAnticorrosioncorrosion gradeElectrical resistivity (Wm )Salt content (mass ratio %)Moisture content (mass ratio %)Ampere density (mA/cm2 %)pH valuegradedeep<50>0.75>12>0.3<3.5Extra reinforcementModerate50-1000.75-0.055-120.3-0.0253.5-4.5reinforcementWeak>100<0.05<5<0.0254.5-5.5ordinaryNote: If any value of the items is higher than the corresponding target shown in the table, the anticorrosion grade should be increased in one class.3.4.3 Anticorrosion grade should be extra reinforcement grade for buried piping passing through railway, road, kennel and angle branch location, where needing depth of burying changed.3.4.4 Petroleum asphalt or coal asphalt epoxide anticorrosive paint can be used for anticorrosion coating.The coating structure should be conform to the specification in the Table 3.4.4-1 and 3.4.4-2.Table 3.4.4-1 Anticorrosion structure of petroleum asphalt (mm)Anticorrosion gradeAnticorrosion coating structureThickness of each layer asphaltTotal thickness of coatingExtra reinforcementasphalt primer- asphalt - glass cloth- asphalt- glass cloth- asphalt- glass cloth- asphalt- glass cloth- asphalt- industrial polyvinyl chloride film 1.5 7.0Reinforcementasphalt primer- asphalt - glass cloth- asphalt- glass cloth- asphalt- glass cloth- asphalt- industrial polyvinyl chloride film 1.5 5.5ordinaryasphalt primer- asphalt - glass cloth- asphalt- glass cloth- asphalt- industrial polyvinyl chloride film 1.5 4.0Table 3.4.4-2 Anticorrosion coating structure of coal asphalt epoxide (mm)Anticorrosion gradeAnticorrosion coating structureTotal thickness of coatingExtra reinforcementPriming coat-top coat glass cloth- top coat glass cloth- top coat glass cloth- two layer top coat 0.8ReinforcementPriming coat-top coat glass cloth- top coat glass cloth- two layer top coat 0.6OrdinaryPriming coat-top coat glass cloth- two layer top coat 0.43.4.5 Requirement of asphalt performance for petroleum asphalt anticorrosion coating should meet specification in Table 3.4.5-1.Performance of petroleum asphalt should meet specification in Table 3.4.5-2.Asphalt yield point of anticorrosive coating should 45°C higher than normal operating temperature of equipment or medium in piping, the suitable needle density is less than 20 (1/10mm).Table 3.4.5-1 Requirement of asphalt performance for petroleum asphalt anticorrosion coatingMedium temperature°CPerformance Requirement DescriptionYield point (ring-ball)Needle penetration (25) (1/10mm )Tensibility (25)(cm)normal7515-30>2Using 30# asphalt, or 30# asphalt compounded with 10# asphalt2550955- 20>1Using 10# asphalt, or 10# asphalt compounded with 2#, 3# special asphalt51701205-15>1Using 2#, 3# special asphalt7175115<25>2Using special modified asphaltTable 3.4.5-2 Performance fo