【正文】 provide your suggestion as well as the related information to the editorinchief unit for reference of further revision. Editorinchief address: Fuli west street ,Xigu, lanzhou city, Gansu Postcode 730060 Box 60,Zhenghai, Ningbo city, Zhejiang Postcode 315207 Editorin chief unit of the specification: Lanzhou Design Institute, SINOPEC The Third Constructinal Company,SINOPEC Chief draftsman: Xuyanbing, Baicaiqing, Zhanyanchan, Wangshande — 3 — Contents 1. General…………………………………………………………………………………4 2. Expressions, Terms………………………………………………………………………4 3. Design……………………………………………………………………………………5 General specification……………………………………………………………………5 Surface treatment………………………………………………………………………8 Anticorrosion for onground equipment and piping ……………………………………9 Anticorrosion for buried equipment and piping……………………………………11 4. Construction……………………………………………………………………………13 General specification …………………………………………………………………13 Surface treatment and examination before coating……………………………………14 Anticorrosion construction for onground equipment and piping……………………17 Anticorrosion and construction for buried equipment and piping …………… …………21 Safety protection…………………………………………………………………………24 5. Evaluation and acceptance………………………………………………………………24 General specification……………………………………………………………………24 Evaluation and acceptance of anticorrosion engineering for onground equipment and piping………………………… ………………………………25 Evaluation and acceptance of anticorrosion engineering for buried equipment and piping……………………………………………………………26 Appendix A Classification of corrosive substance in atmosphere……………………………29 Appendix B Normal anticorrosive coating for equipment and piping………………31 Appendix C Estimation of coating use level………………………………………………52 Appendix D Normal qualification of anticorrosive coating for equipment and piping………53 Appendix E Qualification of vinly etch primer………………………………………64 Appendix F Cause of defects in coating operation and preventing measure……………65 — 4 — 1. General 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. When the specification being carried out, it should be done according to the current related mandatory standards specification. 2. Expression, Terms 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 (, anticorrosion etc.).In names of concrete coating varieties, “Paint” can be used to prefer to “coating”, such as anticorrosive paint, acidresisting paint, etc. Paint film Continuous film formed by coating object surface uniformly using paint, consisting of one or several coating layers. 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. Enamel A kinds of paint forming hard and flush and smooth paint film usually similar to enamel in appearance after coating. Priming coat A kind of paint used directly to coat steel surface for multilayer coating Surface A kind of paint used to correct non plain primer surface for multilayer using. 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. — 5 — Top coat Top coat used to coat uppermost layer for multilayer coating, needed one or two courses generally. Adherend Adhernd mainly includes welding slag, spatters, solubal salt, oil and fat, soil, oxide layer, rust, aged coating ,etc. Covering power Give one course of coating uniformly on object surface till the surface pletely being covered without showing original state, now the gram of used paint called as masking power, unit: g/m2. 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”. 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℃ . 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℃ . Slightly hygroscopic medium Slightly hygroscopic medium means medium of alkali and salt having relative equilibrium moisture equal to or of more than 60% at the temperature of 20℃ . 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. Design General specification Selecting point should obey the following rules: ⑴ Conforming to operating conditions of object to be coated. ⑵ Conforming to material quality of object surface coated. ⑶ Wellmatching of various layers paints ⑷ Safe reliability, economic rationality. ⑸ Satisfying essential requirements of construction. Surface of equipment, piping and their accessory steel structures, which are made of carbon steel and lean alloy should be paintcoated. — 6 — Priming coat of adherence grade Ⅰ measured according to the current national standard “Measurement of Paint Film Adherence” GB/T1720 ought to be used as priming coat