GB 19518.1-2004 Electrical apparatus for explosive gas atmospheres - Electrical resistance trace heaters - Part 1: General and test requirements

This part of "Resistive Heaters for Electrical Equipment in Explosive Gas Atmospheres" specifies the general and test requirements for resistive heat tracers for explosive gas atmospheres. The heat tracers described in this part include single units assembled in the factory or on-site (construction site), and may also be series heating cables, parallel heating cables or heating pads and heating plates that have been assembled and/or terminated according to the manufacturer's instructions. This part also includes the termination requirements and control methods for the use of heaters. The hazardous areas involved in this part are the same as those defined in GB3836.14. GB 19518.1-2004 Resistive Heaters for Electrical Equipment in Explosive Gas Atmospheres Part 1: General and Test Requirements GB19518.1-2004 Standard download decompression password: www.bzxz.net

ICS 29. 260. 20
National Standard of the People's Republic of China
GB 19518.1—2004/1EC 62086-1:2001 Electrical apparatus for explosive gas atmospheres-Electrical resistance traceheatingr--Part 1:General and testing requirements(1EC 62086-1:2001,IDI)
Issued on 2004-05-14
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implementation on 2005-02-01
All technical contents of this part are mandatory. Foreword
GE19518.1—2004/EC62086-1:2001 "Electrical Equipment for Explosive Gas Atmospheres - Electrical Resistance Heaters" series of standards consists of two parts. This part is the first part of the standard. The general title includes the following contents:
—GB319518.1: Test and general requirements; --- (B/T105[8.2: Design, installation and maintenance guidelines, this part is equivalent to TFC62086i-1:2001 "Electrical Equipment for Explosive Gas Atmospheres - Electrical Resistance Heaters - Part 1: General Test Requirements English version).
This part is similar to IEC62086-1:2001 in terms of technical content and text structure. Only a note is added after Article 5.1.12 to explain the influence of transient process in the starting current verification test of resistance heater. From the date of implementation of this part, the provisions of GB33836.3 on resistance-type heat tracers shall be replaced by this part. From the date of implementation of this part, all products that do not comply with this part shall complete the transition within two years. This part was proposed by the China Electrical Equipment Industry Association. This part is under the jurisdiction of the National Technical Committee for Standardization of Explosion-proof Electrical Equipment. The main drafting units of this part are: Nanyang Longbao Electric Research Institute, Shanghai Baidong Instrument Research Institute, Jiangyin Huaneng Electric Heating Equipment Co., Ltd., Wuxi Jinhuanqiu Electric Equipment Co., Ltd., Wuxi Shengyuan Electric Heating Appliance Factory, Anhui Xinke Electric Cable Group and Wuhao Hengye Electric Heating Equipment Co., Ltd.
The main drafters of this part are: Li Hede, Xu Jianping, Bao Juexing, Cai Guorong, Pan Mingqing, Wu Zhi, Zhao Fang, Huang Xiaodong, Li Shuchao and Zhao Hongyu. This part was first issued in May 2004. This part is entrusted to the National Technical Committee for Standardization of Explosion-proof Electrical Equipment for interpretation. GR19518.1-2004/IEC62086-1:2001EC The technical part of IEC62086 aims to provide basic requirements and test overview for resistance heating equipment used in explosive gas environments. The requirements in the standard are considered to be the minimum requirements for Zone 1 or Zone 2. For the contents described in this part that already exist in some national standards or international standards, this part checks most of them and makes a lot of supplements. This part is intended to be used in conjunction with IEC62086-2\Electrical apparatus for explosive gas atmospheres - Part 2: Guide to design, installation and maintenance" Electrical apparatus for explosive gas atmospheres - Part 2: Guide to design, installation and maintenance" Electrical apparatus for explosive gas atmospheres - Part 2: Guide to design, installation and maintenance" Electrical apparatus for explosive gas atmospheres - Part 2: Guide to design, installation and maintenance" Electrical apparatus for explosive gas atmospheres - Part 2: Guide to design, installation and maintenance" 1 Scope GB 19518.1—2004/IEC 62086-1:2001 Electrical apparatus for explosive gas atmospheres - Part 1: General and test requirements This part of "Electrical apparatus for explosive gas atmospheres - Electrical resistance heaters" specifies the general and test requirements for electrical resistance heaters for explosive gas atmospheres. The heaters described in this part include factory assembled or field (site) assembled units, and may also be heat trace cables, well-connected heating cables or heating pads and heating plates that have been assembled and/or terminated in accordance with the manufacturer's instructions. This part also includes the termination requirements and control methods for the use of heaters. The hazardous areas involved in this part are the same as those defined in GB3836.14.
2 Normative references
The clauses in the following documents become the clauses of this part through reference in this part. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, the parties who reach an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions are applicable to this part. GB/T2900.1:1992 Basic terms of electrical terminology (neqIEC60050-151:1977) GB/T2900.351998 Electrical terminology Electrical apparatus for explosive atmospheres (e9IEC60050 (426):1990) GB3836.1-2000 Electrical equipment for explosive gas atmospheres Part 1: General requirements (eqvTEC60079-0:1998) IEC60364-3 Electrical installations of buildings Part 3: General characteristics evaluation 3 Terms and definitions
≤Electrical equipment for explosive gas atmospheres Resistance heating This part of "Electrical equipment for explosive gas atmospheres" adopts the following terms and definitions and the terminology and definitions in GB/T2900.351998 and GB3836.1. 3.1
Ambient temperature ambienttemperalure
The ambient temperature of the object being assessed. When the heater is wrapped by insulation material, the ambient temperature refers to the temperature outside the insulation material. 3.2
Branch circuit
The installation line part between the circuit overcurrent protection device and the heater (unit). 3.3
connections (terininations)
cold lend
an insulated single or multiple conductors used to connect a heater to a branch circuit, which do not generate significant heat. 3. 3. 2
terminal connector or tail connectorentiterminationa connector located at the opposite end (or the other end) of the power supply end of the heater, which may generate heat. 3.3.3
power supply connectorpowerlermination
a connector located at the power supply end of the heater.
GB 19518.1—2004/IEC 62086-1:20013.4
teestec
a transport component or support provided for the electrical connection of series or parallel heaters. 3.5
dead pipe leg
A section of process pipe separated from the normal flow pipeline, which can help to compensate for heat loss. 3.6
desigo loading
The minimum power that meets the design requirements under the most unfavorable conditions, taking into account voltage and resistance deviations and appropriate safety factors. 3.7
factory fabricated
Assembled as a single or complete set of heating cables, heating cables or devices, including necessary joints and connectors. 3.8
field-assemhled
Assembled into a unit with bulk heating and connectors at the work site. 3.9
heat lossheatloss
Energy dissipated from a pipeline, container or equipment to the surrounding environment. 3.10
heat sink
The part of a door that transfers and dissipates heat from a door. Note: Typical heat sinks are pipe supports, pipe brackets or large items such as valve actuators or pump bodies. 3.11
Material that promotes heat transferheat-1transfer uidsHeat-conducting materials such as metal box tape or thermally conductive paste can increase the efficiency of heat transfer from the heat source to the workpiece.3.12
Heating padheating pad
Heating pad ...15bzxZ.net
maximum ambient temperatureinaximum ambienl femperatureThe maximum ambient temperature at which the heater can operate normally and should be able to operate normally according to the specified requirements. 3.16
maximun withstand teaperalureThe maximum operating overflow or exposure temperature that will not adversely affect the thermal stability of the heater and its components. 3.17
metallic sheath/shieldmetalliccoveringmetallic sheath or metal braiding that provides physical protection to the heater, and/or electrical grounding circuit. 3.18
minimum ambient temperatureminimumambienttemperatureGB 19518.1—2004/JEC 62086-12001The minimum ambient temperature at which the heater can operate normally and should be able to operate normally according to the specified requirements (the calculation of the heat loss peak is also based on this temperature).
operating voltageoperatingvollage
The actual voltage applied to the heater when it is in operation. 3.20
over jacket
Insulating material continuous outside a metal sheath, braid or armor to prevent corrosion 3.21
power density
power density
power output density. For heating tapes or cables, it is watts per meter (W/m); for heating plates or panels, it is watts per square meter (W/m). 3.22
rated output
The total power or the power per unit length of a heating cable or heating device under rated voltage, temperature and length conditions: expressed in watts per meter (W/m) or watts per half meter (W/m)
rated voltage
Rated voltage
The voltage involved in the operation and performance of the heating device. 3.24
routinetest
a test to be performed on each individual device during or after manufacture to determine whether it complies with a standard. [IE1510416
series trace heater(s)Heating devices electrically connected in series with a single current loop, with a constant resistance of a given length of heater at a specified temperature.
sheath
a uniform and continuous metallic or non-metallic sheath covering the outside of the heater or cable to protect it from the influence of the surrounding environment (corrosion, condensation, etc.), see 3.20 outer sheath. 3.27
sheathtemperature
the temperature of the outermost continuous or exposed sheath. 3.28
Slabilized design
Through the design and the use of the state of regulation, the temperature of the heater is stabilized below the limit temperature under the most unfavorable conditions, and no protection system is required to limit the overflow.
Start-up current
The instantaneous current when the heater is powered.
G#19518.1-2004/IEC62086-1.20013.30
System documentationSystem documentationInformation provided by the supplier to meet the understanding, installation and safe use of the heater system. 3.31
Temperature controller1Empty controllerInstrument or instrument combination with temperature sensing device and heater power control device. 3.32
Temperature sensor (sensing element)Temperature sensor (sensing element)Instrument designed to provide electrical signals or mechanical actions by overflow sensing. 3.33
thermal insulation
Material with air bubbles or cavities, voids or heat-reflecting surfaces that, when used correctly, can reduce heat transfer. 3.34
raceheater
A device that generates heat by the principle of resistance heating, usually consisting of one or more wires or other conductive materials that are properly insulated and protected.
Traceheater unit (traceheater set) A series or parallel type heating cable, heating pad or heating plate that meets the requirements of the manufacturer's instructions and is connected in accordance with the manufacturer's instructions. 3.36
Trace beating
External heating cables, heating components, heating panels and related components can improve or maintain the mixing degree of the medium in pipelines, tanks and related equipment.
Type test
A test to verify whether one or more devices manufactured according to a certain design meet specific requirements: [1FV15]-04-15]3.38
Weather protection layer barrier
Meter protects the insulation material from water or other liquids flooding, physical damage caused by ice, snow, wind or mechanical accident, and prevents degradation due to solar radiation or environmental pollution. 3.39
Workpiece
The object applied by the heater.
Note: Examples of these objects include process equipment: such as pipelines, containers, tanks, dampers, meters and similar equipment. 4 General requirements
4.1 Overview
Resistive heaters that meet the requirements of this part of the scope The structure of the heater should ensure its electrical, thermal and mechanical durability and reliability. The purpose is to not cause harm to users or the environment under normal conditions of use. Resistance heaters and joints should comply with one or more explosion-proof types listed in GB3836.1 and the supplementary provisions in this standard. The manufacturer should mark the maximum working temperature of the product (°C). The materials used in the heater should be able to withstand a temperature test not lower than the maximum working temperature - 20K when tested in accordance with the requirements of 5.1.10. This part:
- Resistance heaters are not considered to be spiral; GB Chapter 7 of IEC 62086-1:2001-GB3836.1-20K00 does not apply to electrical insulation materials of heaters. 4.2 Heaters
Heaters shall be protected by metal protective mesh or metal protective sleeves with a coverage area of ​​at least 70%. When tested in accordance with the provisions of 5.1.5, these protective layers shall be able to withstand an impact energy of 7J or 4". For an impact energy of 4J, an "X" shall be marked on the heater. 4.3 Connectors and connections
Connectors and connections may be marked as an integral part of the heater or separately. In the latter case, they are tested as \Ex\ components in accordance with Chapter 13 of GR3836.1~-2000. Connectors and connections are tested as part of a representative electric heating unit, see 5.1.1.
4.4 Circuit protection requirements for branch circuits
The minimum requirements for heating systems used in hazardous areas are: a) take measures to isolate all grounded conductors from the power supply; b) provide overcurrent protection for each branch circuit; c) take measures to prevent ground faults according to the system grounding form (see the definition in IFC:60364-3). For TT and TN systems:
d) use a galvanic current protector with a rated residual (residual) operating current not exceeding 300mA for all branch circuits. The disconnection time of the protector at 5 times the rated residual (residual) operating current shall not exceed 150rns. The values ​​of 30 mA and 30 ms are preferred unless there is evidence that this will result in a significant increase in unnecessary tripping. Note 1: In addition to supplementing the overcurrent protection function, this protection function is to "limit the thermal effects caused by ground faults and ground currents under abnormal conditions:
Note 2: The requirements of a), h), ) and <) can be implemented by one device. For IT systems:
e) An electrical insulation monitoring device should be installed to ensure that the power supply is disconnected when the resistance is not greater than 50Ω/V (rated voltage) in any case.
4.5 Control and temperature requirements
4.5.1 Overview
Under all foreseeable and reasonable conditions, the heating system should be designed so that the surface temperature of the heater is limited to below the temperature group or ignition temperature, that is, 5K lower than this temperature value when the temperature is not higher than 200℃, or 10K lower than this temperature value when the temperature is higher than 200℃. By adopting the steady-state structure specified in 4.5.2, or by adopting the provisions of 4,5,3. The temperature control device that limits the maximum surface temperature of the equipment jacket as specified in 1 should be able to achieve the requirements of 1.
When multiple heaters are combined together (especially on pipelines with different flow conditions) and a surface sensing temperature control device is used, each heater should be analyzed as a steady-state structure pipeline. 4.5.2 Steady-state structure for zones 1 and 2
When the maximum surface temperature of the heater is not determined by the temperature controller, the steady-state structure should use the system simulation specified in 5.1.11.2 or the product classification method specified in 5.1.1.1.3. 4.5.3 Control Design
When a temperature control device is required to limit the maximum temperature of the pipeline, the control design shall comply with a) for Zone 1 and a) or b) for Zone 2:
a) For heaters used in Zone 1 or Zone 2. When a temperature control device is required to limit the maximum jacket surface temperature, the control design shall use a protective device that can cut off the power supply to the heating system after exceeding the maximum operating temperature. The system can be restarted manually after the process conditions return to the previously determined process conditions. When a sensor fails or the sensor is broken, the heating system should be de-energized until the faulty device is replaced. The setting of the protective device should be reliable and sealed to avoid arbitrary operation. The action of the protective device should be independent of the temperature monitoring system. GB 19518.1—2004/IEC 62086-1:2001) For the heaters used in Zone 2, a separate temperature control device with fault alarm can be used. In this case, adequate alarm monitoring measures should be taken, such as 2h monitoring. If the manufacturer does not provide the control device, sufficient instructions should be given for selection and installation: 5 Tests
5.1 Type test
5.1.1 Overview
23.4.1 in GB3836.12000 is applicable to the following supplement. The length of the test sample of the heater should be at least 3m, unless otherwise specified: The source temperature during the test is between 10℃ and -40℃, unless otherwise specified. Whether it is used for factory assembly or for on-site assembly, its joints and connectors are regarded as an integral part of the heater and must be subjected to the same tests as the heater, unless otherwise specified. The connections shall include terminal connectors, tees, two-way power connectors, and sealed connectors, accessories and seals where the heating cable enters the junction box.
5.1.2 Dielectric strength test
The dielectric strength test shall be carried out on the heater in accordance with the provisions of Table 1. Table 1 Dielectric strength test voltage
Rated voltage
<30 V rm, s.
<60 y dc
2230 V rm,5.
60 v de
Test voltage/Va.t .ms
2L1: +1 000
21+1 000
In the table: is the rated voltage. The test voltage is applied between the conductor core and the metal expansion net or jacket. The test voltage rise rate is between 100V/s and 200V/s and is maintained for 1 minute without dielectric breakdown. The waveform of the test voltage is nearly sinusoidal and the frequency is 45 Hz--65 Hz.
5.1.3 Insulation resistance test
The insulation resistance test should be carried out on the samples specified in 5.1. after the dielectric strength test specified in 5.1.2. The insulation resistance should be measured by applying a DC voltage of 1000V for mineral insulated heaters and a DC voltage of 2500V for polymer insulated heaters between the conductor core and the metal expansion layer, or between a special conductive metal belt or metal protective net. The measured value should not be less than 50M05.1.4 Burning test
The heater should be subjected to a burning test. The test is carried out in a room without air flow (or ventilation). The length of the test sample of the heater shall be at least 45 mm and shall be suspended vertically. For other types of heaters such as heating units, heating plates, etc., the width of the test sample shall be 80 mm.
Wrap a piece of primary color adhesive test paper around the test sample so that the test paper protrudes 20 mm from the sample. The test paper shall be 250 mm above the point where the color chain flame inside the hand flame contacts the sample. A ball of dry medium pure cotton wool with a thickness not exceeding 6 μm shall be placed under the test sample, with a distance of 250 mm from the cotton wool to the point where the flame is applied. The height of the natural gas blowtorch flame shall be adjusted to 130 mm and the height of the blue cone flame inside it shall be 10 mm as shown in Figure 1a). The blowtorch shall be tilted at an angle of 20° to the vertical and the flame shall be applied to the sample so that the tip of the blue cone flame inside the flame touches a point approximately 150 mm above the bottom of the test sample. The flame shall rest on the heater in such a way that the vertical plane containing the main axis of the burner tube is at right angles to the plane of the cable under test as shown in Figure 1b). The flame shall be applied for 15 s and then reapplied 15 s later. This process shall be repeated 5 times.
If the heater continues to burn for less than 1 min after the fifth application of the flame, 25% of the extended test paper remains unburned - and the falling burning particles do not ignite the cotton wool below, the test result is considered to meet the requirements. 5.1.5 Impact test
B19518.1—2004/1EC62086-1:2001 Note: In most cases, electrical heaters are covered with protective material, thereby providing a certain amount of mechanical protection. However, in some places of use, the heater may be installed in a place where it is no longer possible to use insulation to protect it, for example: before the insulation is installed, or the heater is led out of the insulation into the terminal pin:
Place a sample of about 200 mm in length on a steel plane, and place a section of hot steel with a diameter of 25 mm flat on it. The sample is located in the middle of the cylinder. When used for heating pads and heating plates, the steel cylinder is required to be 25 mm long and have a smooth balance angle with a radius of about 5 trim (see Figure 2). When conducting the test, place the steel cylinder horizontally on the sample. When the sample is a heating cable, the axis of the steel cylinder should be perpendicular to the sample. For heating cables with non-circular shapes, they should be placed in a state where the direction of the impact force is consistent with the short axis of the circular cable (that is, the heating cable is placed flat on the steel plate). The impact hammer with a mass of 1 kg is to be dropped from a height of 700 mm to impact on a horizontal cylinder (i.e. the impact energy is 7), except for the test where the electric heater is used in a place where the risk of mechanical damage is small. The unit is millimeter
a) The height of the gas flame
.....Blowtorch
Emperor hook:
Test paper mark:
-Sample:
Dry cotton wool.
Around 1 combustion test
b) The vertical surface and the test electrode are at an angle
According to the provisions of 4.2, if the risk of mechanical damage to the place where the heater is used is small, the impact height is called 100m1 (the impact energy is 4J). At this time, according to the requirements of Chapter 6, an obvious sign symbol "X" must be added to warn users to reduce the possibility of mechanical action on the heater.
GB 19518.1—2004/IEC 62086-1:2001 With the steel round impact hammer still placed on the sample, check whether the electrical insulation meets the requirements according to the provisions of 5.1.2 and 5.1.3.
5. 1.6 Extrusion test
The specimen is placed on a hardened steel surface and a non-impact pressure of 1500V is applied to the specimen through a steel rod with a diameter of 6 mm and a length of 25 mm. The end is hemispherical. The test time is 30 s. When the test is carried out, the steel rod is placed flat on the specimen. If the specimen is a heating cable, the round steel and the specimen are placed vertically. If the specimen is a heating pad, it must be ensured that the round steel acts horizontally on the effective element. For heaters with a low risk of mechanical damage in the place of use, the pressure can be reduced to 800N. In this case, the heater is marked with a clear sign "X" in accordance with the provisions of Chapter 6 to remind users to reduce the possibility of mechanical action. 1--Impact hammer with a mass of kg:
Hardened steel round bar with a diameter of 25 mm:
Short axis of non-circular heating cable:
4--Steel round bar with a total length of 25 mms and with a radius of 5 mm when used for heating potential and heating plate tests Chamfer t5--- Impact casting drop height; 700mm or 40mm Figure 2 Impact test
When the steel bar does not leave the sample and the load is applied, check whether the electrical insulation meets the requirements according to the provisions of 5.1.2 and 5.1.3. Violation: The heat tracer test only selects a length of about 200mm. 5.1.7 Cold bending test
The apparatus used for the cold bending test is shown in Figure 3. The test apparatus with the specimen installed is kept at a temperature of -25℃ to -30℃, or at the lowest installation temperature declared by the manufacturer for 4 hours. After this, the specimen is quickly bent 90° around a circular drum and then bent 180° in the opposite direction around another semicircular drum. The specimen is then extended to its original position. This bending is repeated twice. Check whether the electrical insulation meets the requirements in accordance with the provisions of 5.1.2 and 5.1.3. Note: The system documentation provided by the manufacturer shall describe all limiting and protective measures to be taken, as well as the minimum permissible value of the bending radius. 5.1.8 Moisture resistance test (applicable only to heating cables) The heating cable sample with joints and at least 3m long shall be placed in a water tank with flowing water and drainage device as shown in Figure 4. GB 19518.1—2004/1EC 62086-1:2001 The flow rate shall be adjusted so that at least 30s per 5in completely immerse the cable and joints. The water shall then be drained. The voltage applied to the water flow control valve and the voltage applied to the heating cable shall be controlled by a rotary switch or equivalent device. The timing sequence shall be such that the heating cable is powered 308 after the water is drained. The test shall be carried out continuously for 24 hours1-mixed heating cable sample;
-steel base;
round steel coil
Figure 3 Cold bending test-type test
At the end of the test, the sample shall be inspected in accordance with the provisions of 5.1.2, and the end joint shall also be checked to confirm that there is no water intrusion.
5.1.9 Verification of rated output power
The rated output power of the heating cable, heating plate or heating pad shall be verified by one of the following two methods, which the manufacturer may choose: a) Resistance: The DC resistance per unit length measured under the specified temperature conditions shall be within the tolerance range declared by the manufacturer. b) Output power: The output power of the heating cable is determined by installing a single sample of the heating cable 3 m-~6 m long on a carbon steel pipe with a diameter of 50min or more as shown in Figure 5. The cable is installed according to the manufacturer's installation instructions. The test device is completely wrapped with insulation material with a thickness of 25 mm. For heating pads or heating plates, the test is performed on a cold metal plate with a thickness of 25 mm insulation material. Select an appropriate heat transfer liquid to circulate through the pipeline with sufficient flow and form turbulence, so that the temperature difference between the fluid and the pipeline can be ignored. The temperature of the heat transfer liquid is maintained constant. This parameter is verified by thermocouples installed at the inlet and outlet of the pipeline. The liquid flow rate
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