SH/T 3203-2018 PDF EnglishUS$275.00 · In stock · Download in 9 seconds
SH/T 3203-2018: Specification for design of electric heater systems of petrochemical industry Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsSH/T 3203-2018: Specification for design of electric heater systems of petrochemical industry---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/SHT3203-2018Specification for design of electric heating system of petrochemical industry Table of ContentsForeword ... II 1 Scope ... 1 2 Normative References ...1 3 Terms and Definitions ... 3 4 General Requirements ... 3 5 Use Conditions ... 3 5.1 General Requirements ...3 5.2 Electrical ...4 5.3 Explosive Atmosphere ... 4 5.4 Corrosive Atmosphere ... 4 5.5 Equipment Layout ... 4 6 Electric Heating System Construction ...4 6.1 Electric Heater ...4 6.2 Pressure Vessel ...8 6.3 Control System ... 8 7 Electric heating system Heat Transfer Calculations ... 10 8 Power Supply Design ...11 8.1 General Requirements ...11 8.2 Switchboards ... 12 8.3 Electrical Protection ... 12 8.4 Branch Circuit Electrical Protection ... 13 Bibliography ...14 Explanation of Wording in the Specification ... 151 ScopeThis specification specifies the requirements for design of electric heating system in petrochemical industry. This specification is applicable to the design of electric heating system for newly constructed, extended, or renovated projects of petroleum refining enterprises, petrochemical enterprises, and coal-based fuel and chemical products manufacturing enterprises. This specification is not applicable to the design of short net heating and AC electric heating system with supply voltage of 1140V.2 Normative ReferencesThe following documents are essential for the application of this specification. While for those with date noted, only their revisions noted with date shall be applicable to this Specification, and for those without date noted, their latest revisions (including their all amendments) shall be applicable to this Specification. GB/T 150.1 Pressure vessels - Part 1: General requirements GB/T 150.2 Pressure Vessels - Part 2: Materials GB/T 150.3 Pressure vessels - Part 3: Design GB/T 150.4 Pressure vessels part 4 - Fabrication, inspection and testing, and acceptance3 Terms and DefinitionsThe following terms and definitions apply to this specification. 3.1 electric heater A heat generating device that converts electrical energy into thermal energy by means of the thermal effect of electric current. 3.2 electric heater system A system that consists of electric heater, vessels, controls, accessories, etc. 3.3 electric heating element An element that converts electrical energy into heat energy. 3.4 power density Heat flow or surface load, that is, the heating surface power per unit area4 General Requirements4.1 The design of an electric heating system shall involve the requirements for service condition, system structure, heat exchange calculations, and power supply and distribution design. 4.2 The performance indicators and main parameters of an electric heating system shall include heating medium, inlet and outlet medium temperature, inlet and outlet medium pressure, flowrate, calculated pressure drop, allowable pressure drop, maximum permissive temperature of electric heating elements, vessel size and maximum operating wall temperature, rated power of the heater under rated voltage, quantity of circuits of each heating tube bundle, power density, shell material, shell diameter, tube sheet material, supporting elements, gaskets, heating element material, magnesium oxide powder, heater installation method, size of terminating chamber, explosion-proof grade/group/temperature class, degrees of ingress protection, quantity of thermocouples, quantity of heaters in series, heating elements and quantity of spare elements, etc. 4.3 The design of vessel shall include design temperature, design pressure, material, corrosion allowance, nozzle load analysis, inlet/outlet nozzle size, etc. 4.4 The design of the control system shall include the power and electronic components in the control cabinet, control mode, circuit breakers, AC contactors, etc. 5 Use Condition 5.1 General Requirements 5.1.1 The installation and use of the electric heating system shall meet the local meteorological and geological conditions. 5.1.2 The use environments of the electric heating system may include: normal atmosphere, explosive gas hazardous atmosphere, explosive dust hazardous atmosphere, and corrosive atmosphere, etc. 5.1.3 The explosion-proof types, degrees of ingress protection and corrosion-proof levels of the electric heating system shall be suitable to be installed in the required atmosphere. 5.1.4 The IP code of the electric heater shall be no lower than IP55，when it is installed outdoor. When the electric heater is installed in pressurized, toxic or harmful medium, it shall prevent process medium leakage caused by damage of heater casing, weld bead, seals and etc. 5.2 Electrical 5.2.1 The electric heating system is connected to an AC external power supply. Under normal operating conditions, phase-to-phase voltage of the power shall be 380(660)±7% (V), and frequency shall be 50 Hz ± 0.5 Hz. 5.2.2 In areas altitude higher than 1000 m, the effect of the altitude shall be taken into account during electric heating system design. 5.3 Explosive Atmosphere 5.3.1 The classification of explosive hazardous gas atmosphere and explosive hazardous dust atmosphere shall meet the requirements specified in GB50058 and GB12476.3. 5.3.2 For electric heating system in explosive hazardous atmosphere, selection of explosion-proof type, explosion-proof grade and temperature group should be according to different hazardous area. 5.4 Corrosive Atmosphere 5.4.1 Electric heating system installed in corrosive atmosphere shall meet the requirements of SH/T3200. 5.4.2 The metal parts of an electric heater shall be subjected to anti-corrosion treatment or they shall be made of special materials such as stainless steel. 5.5 Equipment Arrangement 5.5.1 The equipment arrangement shall meet the requirements for the installation, stable and reliable operation of the electric heater system. 5.5.2 The equipment arrangement shall reserve the space for extraction of electric heating tubes, as well as the space for routine maintenance and repair of electric heater system. 5.5.3 Electric heaters may be installed either vertically or horizontally. 5.5.4 Heat expansion of an electric heater and lifting facilities shall be taken into account in equipment arrangement.6 Electric Heating System Construction6.1 Electric Heater 6.1.1 The design and manufacturing conditions of electric heater shall meet the following requirements: a) The electric heater shall not exceed the allowable temperature of metal materials; b) The parameters, such as the pressure drop of the process medium from the inlet to the outlet, shall be provided. 6.1.2 The electric heater shall be comprised of electric heating elements, terminating chamber, etc. 6.1.3 The design of electric heating elements shall meet the following requirements: a) The electric heating elements shall be comprised of heating elements, insulating materials and electric heating tubes; b) High-performance heating elements shall be used as the basic heating apparatus. High-performance pure nickel-chromium alloy (Ni80Cr20) should be used as heating materials, and shall complied with the requirements of ASTM B344. c) Heating elements shall be designed taking into account the allowance in resistance increasing due to element operating temperature variation; d) High-temperature crystalline magnesium oxide powder should be selected to manufacture the insulating material whose thickness shall meet the requirements of UL1030; e) All terminals of the heating elements shall be sealed with post cured insulation sealing resistant to high-temperature, epoxy resin should be used; f) The electric heating tubes should be made of nickel-based alloy steel and meet the requirements of UL1030 standard. The heating density of the heating tubes shall meet the process requirements. It can be selected according to the process heating temperature and the corrosion of process medium; g) 10% spare quantity shall be provided in designing electric heating tubes. The spare tubes shall be evenly arranged and may not be wired; h) In the design of the electric heating elements, the internal structure of the heater shall be determined reasonably and the heater groups shall be arranged uniformly and symmetrically so as to prevent overheating and oxidation of the heating elements. 6.1.4 The power density shall be designed using computer-aided design software for electric heating elements so as to select the optimal power density and ensure the performance and service life of the heater. 6.1.5 The arrangement, grouping and test of electric heating elements shall meet the following requirements: a) The spacing for production of electric heating elements, between heating wires, the wiring conductors inside the tubes, and the spacing between them and the metallic tubes shall meet the requirements of the relevant standards. The wiring conductors and heating elements inside the tubes shall be connected by means of crimping or brazing, and the minimum electrical clearance and minimum creepage distance specified in GB3836.3 shall be complied with. The ends of the metallic tubes shall be made of insulating materials, shall be adequately insulated, and subjected to moisture-proof treatment. b) The heating elements shall be wired in phase balance mode. The spacing between different phases or terminal boards shall be no less than the permissive values specified in IEC standard, and shall meet the requirements of BS7351, JB/T2379. c) A fixing ring shall be provided on the bundle core of the electric heating tube. d) Heating elements with the thermocouples welded shall be clearly identified (tagged) in the terminal box. e) The electric heating tubes shall be able to withstand the following tests: 1) Dielectric strength test 1: One test cycle includes one-minute energization and 4-minute de-energization under 1.1 times rated voltage. The AC voltage is applied for one minute. It is 2E+1000 (E is the rated voltage of the electric heater, V). The lowest voltage is 1760 V. High voltage test is conducted under 2000 V; 2) Dielectric strength test 2: Test the dielectric strength after 50 cycles 1.1 times rated voltage power on and off test, 40 minutes exposed in atmosphere and energizing 1 minute. (one cycle of power on and off test consists of 5 minutes energizing, de-energizing, 25 min immersing in water); 3) After the electric heating tubes are placed in a warm box with a temperature of 40C±5C and a relative humidity of 90%±5% for 24 hours, immediately wipe off the surface moisture, and use a 500V megger to measure the insulation resistance between the live part and the uncharged part. The value shall be no less than 10 MΩ; 4) Under the rated operation voltage, the permissive deviation of the rated power of the elements is ±5%; 5) Under the cold state (room temperature), the insulation resistance of the elements shall be no lower than 500 MΩ. The elements are allowed to work under a voltage not higher than 1.1 times the rated voltage. The internal electric heating elements of the electric heater shall be 100% tested. The fabrication of the electric heating tubes involves the processes of powder filling, powder vibration, tube shrinking, and tube bending. The finished tubes shall be subjected to test and inspection. After the individual electric heating tubes are assembled, the insulation resistance of the assembly under high voltage test shall meet the requirements of GB3836.1, GB3836.2, GB3836.3 and JB/T2379. 6.1.6 Temperature measure shall meet the following requirements: a) The electric heater shall be provided with thermocouples according to its operation temperature range. Thermocouples are used to measure and control the temperature of the medium. The thermocouples shall meet the following requirements: 1) Each electric heater shall be equipped with no less than two duplex type thermocouples, one is used for temperature indication, and the other is used for interlock protection ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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