SH/T 3203-2018 PDF English
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| SH/T 3203-2018 | English | 275 |
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Specification for design of electric heater systems of petrochemical industry
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SH/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/SHT3203-2018
Specification for design of electric heating system of petrochemical industry
Table of Contents
Foreword ... 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 ... 15
1 Scope
This 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 References
The 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 acceptance
3 Terms and Definitions
The 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 area
4 General Requirements
4.1 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 Construction
6.1 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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