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GB/T 50046-2018: Standard for anticorrosion design of industrial constructions Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 50046: Historical versions
GB/T 50046-2018: Standard for anticorrosion design of industrial constructions---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT50046-2018GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA UDC P GB/T 50046-2018 Standard for anticorrosion design of industrial constructions Issued on. SEPTEMBER 11, 2018 Implemented on. MARCH 01, 2019 Issued by. Ministry of Housing and Urban-Rural Development of PRC. General Administration of Quality Supervision, Inspection and Quarantine of PRC. National Standard of the People’s Republic of China Standard for anticorrosion design of industrial constructions Developed by. Branch of Chemical Engineering, China Association for Engineering Construction Standardization Approved by. The Ministry of Housing and Urban-Rural Development of the People's Republic of China (MOHURD) Implementation date. March 1, 2019 China Planning Press 2018 Beijing Notification of the Ministry of Housing and Urban-Rural Development of the People's Republic of China 2018 No. 205 Table of ContentsForeword... 6 1 General provisions... 10 2 Terms... 11 3 Basic requirements... 12 4 Structures and members... 19 5 Building protection... 33 6 Structures... 49 7 Materials... 55 Appendix A Corrosion resistance properties of commonly used materials... 61 Appendix B Physical and mechanical properties of commonly used materials ... 65 Appendix C Commonly used coating protection systems... 67 Appendix D Testing methods for linear shrinkage of resin mortar and resin concrete... 75 Explanation of wording in this standard... 78 List of quoted standards... 791 General provisions1.0.1 This standard is formulated with a view to ensuring that buildings and structures subjected corrosive medium are used normally within the design service life. 1.0.2 This standard is applicable to anticorrosion design for buildings and structures subjected to corrosive medium. 1.0.3 Anticorrosion design of industrial constructions shall follow the principle of combining prevention with protection. According to the corrosiveness, environmental conditions, production operation management level and construction and maintenance conditions of the medium produced during the production process, the anticorrosion measures shall be taken in the light of local conditions; protection and prevention shall be strengthened for parts that endanger personal safety and are difficult to be maintained, as well as important load-bearing structures and members. 1.0.4 In addition to the requirements of this standard, the anticorrosion design of industrial constructions shall also meet the requirements of the current relevant standards of the nation.2 Terms2.0.1 corrosiveness classification under the long-term action of corrosive medium, according to the degree of deterioration of building materials, namely appearance change, weight change, strength loss and corrosion rate, the corrosive grade is comprehensively evaluated and divided into. strongly corrosive (“A” hereafter), moderately corrosive (“B” hereafter), weakly corrosive (“C” hereafter) and slightly corrosive (“D” hereafter) 2.0.2 service life of protective layer under the conditions of reasonable design, correct construction and normal use and maintenance, the service life of anticorrosion ground, coating and other protective layers 2.0.6 resistance class to sulphate attack of concrete KS resistance class of concrete to sulfate attack divided by the maximum number of wet-dry cycles measured with test method for resistance to sulfate attack 2.0.7 dense concrete fine stone concrete with impermeability grade greater than P83 Basic requirements3.1 Corrosiveness classification 3.2 General layout and architectural layout 3.2.1 In the general layout, the corrosive effects between adjacent devices or plants should be reduced. The production devices which emitting corrosive gas or dust shall be arranged on the upwind side of the annual minimum frequency wind direction of the plant area. 3.2.5 Equipment for the production or storage of corrosive media should be arranged in a centralized manner according to the nature of the medium and should not be arranged in the basement. 3.2.6 If the building or structure is partially exposed to corrosive medium, local protective measures shall be taken. 3.2.7 The underground pipeline conveying strong corrosive medium shall be arranged in the trench; the horizontal clearance between the trench and the foundation of the plant or important equipment shall not be less than 1m. 3.2.8 Pipes and cables that pass through the floor should be arranged centrally. Pipes or cables that are not resistant to corrosion shall not be buried under the ground floor where corrosive liquid medium acts. 3.3 Design service life period of protective layer 3.3.1 The design service life period of protective layer shall be determined comprehensively according to the corrosiveness class, working environment and maintenance and curing conditions.4 Structures and members4.1 General requirements 4.1.1 Under corrosive environment, the structural design shall meet the following requirements. 4 When the design service life of certain secondary members is different from that of major structure, the secondary members shall be easily replaceable. 4.2 Concrete structures 4.2.1 The concrete structure and members shall be selected according to the following requirements. 4.2.2 The design of prestressed concrete structure shall meet the following requirements. 4.2.5 The minimum thickness of the concrete protective layer with a design service life of 50 years shall comply with the requirements specified in Table 4.2.5. 4.3 Steel structures 4.3.1 In case of corrosiveness class A, lattice structure should not be adopted for the important carrying members such as the truss, columns and main beams; cold-formed thin-walled steel shall not be used. 4.3.4 The sectional thickness of steel structural members should meet the following requirements. 4.3.7 Isolation measures should be taken where different metal materials contact. 4.3.8 For welds of important steel members (such as trusses, columns, main beams) and closed section members, continuous welds shall be used. The weld leg size of fillet weld should not be less than 8mm; if the thickness of the member is less than 8mm, the weld leg size should not be less than the thickness of the member; the stiffener shall be chamfered, and the size of the chamfer shall meet the requirements of drainage, construction and maintenance. 4.6 Timberwork 4.6.1 Softwoods should be selected as timberwork materials, and laminated wood may also be used if conditions permit. 4.6.2 The connecting pieces for timberwork should be made of corrosion-resistant non-metallic or metallic materials. 4.7 Ground work5 Building protection5.1 Ground and floor 5.1.1 The materials used for surface course of ground/floor shall be selected according to Table 5.1.1 based on the type and action of corrosive medium, service life of protective layer, the demands for corrosion resistance and physical & mechanical performances of surface course materials in use, and considering other factors like construction, maintenance conditions, etc. 5.1.8 Precast floor slabs shall be provided with reinforced fine stone concrete casting course. Reinforcing mesh shall be configured for fine stone concrete which shall have a strength grade not lower than C30, and a thickness not less than 40mm. The rebars should be in a diameter of not less than 4mm, spacing not greater than 200mm, and 20mm from the upper surface. 5.1.11 Corrosion-resistant skirting board which should be no less than 250mm in height shall be arranged at the junction of ground/floor with the walls/columns. 5.1.12 Steel members supported on the ground/floor shall be provided with a corrosion-resistant pedestal. The height of the pedestal for steel brackets should not be less than 300mm, and that of the pedestal for steel ladders and handrails shall not be less than 100mm. 5.3.5 Steel and wooden doors and windows shall be applied with anti-corrosion coatings according to the corrosiveness class of the environment. 5.3.6 If the environment is strongly or moderately corrosive to the steel, the opener for side windows and skylights shall be protected with anti-corrosion measures. 5.4 Roof 5.4.1 The roof shall be simple in form, and should be provided with organized drainage. Parapet should not be arranged for buildings with emission of large amount of corrosive dust during the production process.6 Structures6.1 Storage tank and sewage treatment pool 6.1.1 This section is applicable to the reinforced concrete storage tanks and sewage treatment pools that store or treat corrosive liquid medium at normal temperature and pressure. 6.1.2 The design of storage tank body shall meet the following requirements. 6.1.3 Cast-in-situ reinforced concrete shall be adopted for the body of the sewage treatment pool. Expansion joint should not be set up in the tank body. If the expansion joint must be set up, its structure shall be strict and meet the requirements of anti-corrosion and anti-deformation. 6.2 Outdoor pipe rack 6.2.1 Outdoor pipe rack shall be of reinforced concrete structure, steel structure or pre-stressed concrete structure. 6.2.2 In case of corrosiveness classes A and B, the sling type and suspension cable type pipeline rack should not be adopted. 6.3 Exhaust funnel 6.3.1 The choice of exhaust funnel type should meet the following requirements. 6.3.2 The single cylinder exhaust funnel shall meet the following requirements. 6.3.3 The sleeve type exhaust funnel shall meet the following requirements. 6.3.7 If the internal and external surfaces of the exhaust cylinder are affected by the liquid medium, the corrosion-resistant surface shall be set up according to the provisions specified in 5.1 of this standard based on the type and concentration of the medium.7 Materials7.1 General requirements 7.1.1 The materials shall be determined based on the nature, concentration and working conditions of corrosive medium, combined with the corrosion resistance and physical and mechanical properties of materials, the importance of the service positions, the operability of construction, the supply of materials and other factors. 7.2 Cement mortar and concrete 7.2.1 The cement varieties shall be selected according to the following requirements. 7.2.2 Admixtures added into the concrete shall meet the following requirements. 7.2.5 The varieties of polymer cement mortar may be selected from neoprene latex cement mortar, polyacrylate emulsion cement mortar and epoxy emulsion cement mortar. Polymer cement mortar may be used in the action position of media such as salt media, moderate concentration alkali solution, or acidic water. 7.3 Bulk of corrosion resistance 7.3.1 Bulk of acid resistance may be used in the action position of acid and salt media, but shall not be used in the action position of fluorine acid or molten alkali. 7.4 Metal 7.4.1 At normal temperature, cast iron and carbon steel can be used in the action position of sodium hydroxide or sodium sulfide solution. 7.4.2 Aluminum and aluminum alloy may be used in the action position of organic acid, concentrated nitric acid, ammonium nitrate, urea and other media. 7.6 Wood 7.6.1 Wood may be used in the action positions of gaseous medium such as acetic acid mist, hydrogen fluoride, chlorine, sulfur dioxide, etc., and shall not be used in the action positions of liquid medium such as nitric acid, chromic acid, sulfuric acid or sodium hydroxide. 7.6.2 Wood should not be used in areas where the media are dry and wet alternately. 7.7 Resin materials 7.10.2 The priming coatings shall be selected according to the following requirements. 7.10.3 The primer, intermediate, and surface paint of the anti-corrosion coating shall be matched with each other with good combination, and shall meet the following requirements. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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