MT/T 720-1997 Technical requirements for automatic explosion-proof and fire-extinguishing devices for gas extraction pipelines
Some standard content:
—1997
MT/T720-
This standard is drafted based on the structure and main technical parameters of the automatic explosion-proof fire extinguishing device for gas extraction pipelines produced by TATOL Company of Germany, the actual technical performance of the "WZM-1 type gas pipeline automatic explosion-proof fire extinguishing device" of the "Eighth Five-Year Plan" research results, and the factory standard of Xi'an Northwest Optoelectronic Instrument Factory "Technical Conditions of the WZM-1 type gas extraction pipeline automatic explosion-proof fire extinguishing device". This standard is proposed by the Science and Technology Education Department of the Ministry of Coal Industry. This standard is under the jurisdiction of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard is drafted by the Fushun Branch of the China Coal Research Institute. The main drafters of this standard are: Liu Jing, Yu Changlin, Dong Ruiduan, Ma Piliang. This standard is entrusted to the Coal Mine Fire Prevention and Equipment Technical Committee of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry for interpretation. 76
1 Scope
Coal Industry Standard of the People's Republic of China
Technical conditions of automatic preventing explosionand extinguish device for the gas drainage pipingMT/T 720—1997
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of the device. This standard applies to automatic explosion-proof and fire-extinguishing devices for gas drainage piping (hereinafter referred to as devices). 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB191-90 Packaging, storage and transportation pictorial marking
GB/T2423.1-89 Basic environmental test procedures for electric and electronic products Test A: Low temperature test method GB/T2423.2-89 Basic environmental test procedures for electric and electronic products Test B: High temperature test method GB/T2423.4-93 Basic environmental test procedures for electric and electronic products Test Db: Alternating damp heat test method GB3836.1-83 General requirements for explosion-proof electrical equipment for explosive atmospheres GB3836.3-83 Explosion-proof electrical equipment for explosive atmospheres Increased safety electrical equipment e" GB/T6388-86 Shipping packaging delivery and receipt marking GB/T 10111-88 Random sampling method using random numbers 3 Definitions
This standard adopts the following definitions.
3.1 Fire extinguisher simulation device for fire The extinguisher bottle simulator is a receiving and display device. When the simulator receives the fire extinguishing command issued by the control cabinet, it simulates the actual working state of the fire extinguisher bottle and has an indicator light display.
3.2 Temperature detection simulator simulation device for temperature detection The temperature detection simulator is a transmitting device. The operation of the simulator button switch can replace the sensor to transmit the temperature detection signal to the control cabinet. 4 Technical requirements
4.1 General requirements
The device shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 4.2 Composition
The device mainly consists of the following parts:
Control cabinet, infrared flame identifier (hereinafter referred to as probe), test lamp, thermistor temperature sensor (hereinafter referred to as sensor), fire extinguisher bottle, emergency switch.
4.3 Main technical parameters and indicators
MT/T 720—1997
4.3.1 The effective detection distance of the probe should be greater than 0.5m. 4.3.2 The effective emission distance of the test lamp should be greater than 0.5m. 4.3.3 When the sensor reaches 170±10℃, it should output a detection signal. 4.3.4 Signal conversion time between the probe and the control cabinet When a gas explosion occurs in the pipeline, the time from the probe capturing the flame signal to the control cabinet issuing a fire extinguishing command should not exceed 6ms. 4.3.5 Sensor response conditions and automatic fire extinguishing time The sensor is installed at the outlet of the vent pipe , when it reaches 170℃, it sends an electrical signal to the control cabinet. The total time from the appearance of the gas combustion light to the extinguishing of the flame should not exceed 1min. 4.3.6 Fire extinguisher bottle control valve opening time
The fire extinguisher bottle control valve should be opened within 5ms after receiving the fire extinguishing command issued by the control cabinet. 4.3.7 The effective spraying time of the fire extinguishing agent is 500-700ms. 4.4 Functional requirements
Each control area of the device must be equipped with two channels, a working channel and a spare channel, and have the following functions. 4.4.1 Automatic explosion-proof fire extinguishing control function:
When gas explosion occurs in the pipeline of the explosion-proof area, the probe of the working channel of the explosion-proof system transmits the gas explosion light signal to the control cabinet after receiving it. The control cabinet outputs the fire extinguisher bottle start number through program control, starts the working channel fire extinguisher bottle to perform explosion-proof fire extinguishing, and at the same time, the channel sends out sound and light alarm signals. After the fire extinguisher bottle in the working channel is sprayed, the standby channel is automatically converted to the working channel through program control so that explosion-proof and fire-fighting can be carried out when gas explosion occurs again.
4.4.2 Automatic flame retardant fire extinguishing control function:
When gas combustion occurs at the top of the venting pipeline, the sensor of the flame retardant system working channel receives the temperature detection signal and transmits it to the control cabinet, and the fire should be extinguished within 1 minute, and an audible and visual alarm signal should be issued. Its control function is the same as 4.4.1. 4.4.3 Manual flame retardant fire extinguishing control function:
When gas combustion occurs at the top of the venting pipeline, the emergency switch can be operated to directly start the flame retardant system standby channel fire extinguisher bottle to achieve flame retardant fire extinguishing. The control cabinet will issue an audible and visual alarm signal. 4.4.4 Fault monitoring alarm function:
When a circuit break or short circuit occurs in any area of the device, an audible and visual alarm should be issued in the corresponding channel, and the cause of the fault should be displayed. When the power supply fails, the control cabinet will issue a power supply failure audible and visual alarm signal. 4.4.5 Locking function:
When a locking signal is applied to a channel, the fire extinguisher bottle control circuit of the channel will be interrupted, and an indicator light will be displayed. 4.4.6 Door lock function:
The control cabinet should be equipped with a door locking switch. When the control cabinet door is opened, the fire extinguisher bottle control circuit of all channels will be interrupted, and there should be circuit break and fault sound and light alarm signals.
4.4.7 Self-test function:
4.4.7.1 Start self-test. Open the control cabinet door to power the device, and all channels enter the self-test state. After 35 seconds, only the fault light will be displayed (indicating the fault state). After closing the cabinet door and operating the reset switch to reset, only the normal working light will be displayed (indicating entering the normal working state). 4.4.7.2 Manual self-test. Lock the door switch and operate the manual self-test button to detect the working status of each part of the regional channel. When manual self-test is performed in a certain area, the manual self-test light is displayed, and the various function indicator lights of the channel flash and then stop. If any part of the channel has a fault, the corresponding fault indicator light should be displayed.
4.4.7.3 Automatic detection. After the device works normally, all control channels enter the automatic detection state, and the self-test cycle of each channel in each area is 10±2min. The content is the same as the manual self-test. 4.4.8 Working status display function:
MT/T 720--1997
When the device works normally, the working indication should be displayed, indicating that it has entered the normal working state. 4.4.9 Automatic power supply conversion alarm function:
In addition to the AC power supply, the device should also be equipped with a battery power supply, and the continuous power supply time should be no less than 36h. If the AC power supply is interrupted, the device should automatically switch to battery power supply, and at the same time send out a power failure sound and light alarm signal. 4.5 Explosion-proof requirements
The explosion-proof structure of the probe and test lamp shall comply with the relevant requirements of GB3836.1 and GB3836.3. 4.6 Environmental conditions requirements
Control cabinet: Normal indoor environment
The probe and test lamp shall meet the following environmental requirements: Storage temperature: 40℃～+60℃,
Working temperature: -30℃~～+50℃;
Relative humidity: ≤95±3%.
5 Test method
The probe, test lamp, control cabinet and other components shall be connected to the device only after they are inspected and found to meet their corresponding technical conditions. The probes and test lamps in each area are simulated and installed on the gas extraction pipeline. The probes and test lamps are placed opposite to each other, the axis deviation should be less than 1mm, and the interval is 0.5m.
During the test, it is allowed to use fire extinguisher bottle simulators and temperature detection simulators instead of fire extinguisher bottles and sensors. 5.1 Test instruments and equipment
See Table 1.
Table 1 Test instruments and equipment
Fire extinguisher simulator
Temperature detection simulator
Memory oscilloscope
High-speed camera
Projector
5. 2 General inspection
5.2.1 The composition of the device should meet the requirements of 4.2. Range and measurement accuracy
aus level
1000fps
Match with high-speed camera
Film specifications
5.2.2 According to the requirements of the device drawing, check whether the connection of each part is correct. 5.3 Main technical parameter test
Photograph the fire extinguisher
Spraying process
Analyze the fire extinguisher
Spraying time
5.3.1 Effective detection distance of the probe
Apply infrared light (simulated by matches) to the probe at a distance of 0.5m from the probe in the axial direction of the probe. The working state of the device should comply with 4.3.6.
5.3.2 Effective emission distance of the test light
The probe and the test light are opposite and on the same axis, with a distance of 0.5m. Observe the automatic detection working state of each channel of the device, which should comply with 4.3.2.
5.3.3 Sensor response temperature
The sensor is placed in a high temperature box at 170±10℃ and should comply with 4.3.3.5.3.4 Signal conversion time between probe and control cabinet79
MT/T 720-1997
Apply a flame signal to the probe and use a memory oscilloscope to measure the time between the output signal of the probe photoelectric tube and the output signal of the control cabinet output terminal.
5.3.5 Fire extinguisher bottle control valve opening time and fire extinguishing agent effective spraying time The fire extinguisher bottle electric explosion valve and the high-speed camera are started with the same power supply. Use a high-speed camera to shoot the spraying process of the fire extinguishing agent. Then, by showing the film, analyze and determine the fire extinguisher bottle valve opening time and fire extinguishing agent spraying time. 5.4 Various functional tests of the device
5.4.1 Startup self-test test
Open the control cabinet door, turn on the power supply of the device, and observe the working condition of the device after startup. After 3 to 5 seconds, only the fault light is displayed. Close the cabinet door and operate the reset switch to reset. Only the normal working light is displayed, which is considered to be normal for the startup self-test function. 5.4.2 Door lock function test
After the device works normally, open the control cabinet door, and all channels send out circuit break and fault sound and light alarm signals; close the control cabinet door and reset through the reset switch, and the device re-enters the normal working state, which is considered to be normal for the door lock function. 5.4.3 Automatic detection function test
After the device enters the normal working state, observe the control cabinet for 30 minutes. The various function indicators of all channels flash once every 10±2 minutes, which is considered to be normal for the automatic detection function.
5.4.4 Manual self-test function test
After opening the control cabinet door, lock the door switch, operate the manual self-test button of each channel respectively, the channel self-test button light is on, and the various function indicator lights of the channel flash once, which is considered that the manual self-test function is normal. 5.4.5 After the power supply automatic conversion alarm function test device works normally, cut off the AC power supply, the control cabinet power fault light is on, and the buzzer sounds, which is considered that the power supply automatic conversion alarm function is normal.
5.4.6 Under the normal working state of the automatic explosion-proof fire extinguishing control function test device, use a match to apply a flame signal to each channel probe of the explosion-proof area, and the wine spray indicator light on the fire extinguisher simulator of the flame signal channel is on; the fire alarm indicator light of the channel on the control cabinet is on, and the buzzer sounds, which is considered that the automatic explosion-proof fire extinguishing control function is normal.
Note: After each channel test is completed, the reset switch must be operated to reset before the next channel can be tested. 5.4.7 When the automatic flame retardant fire extinguishing control function test device is in normal working state, operate the temperature detection simulator button switch to apply a flame detection signal to each channel in the flame retardant area, the spray indicator light on the fire extinguisher bottle simulator of the channel is displayed, the fire alarm indicator light on the channel on the control cabinet is displayed, and the buzzer sounds, which is considered that the automatic flame retardant fire extinguishing control function is normal.
5.4.8 When the manual flame retardant fire extinguishing control function test device is in normal working state, operate the emergency switch button, the spray indicator light on the fire extinguisher bottle simulator of a channel in the flame retardant area is displayed, the fire alarm indicator light on the channel on the control cabinet is displayed, and the buzzer sounds, which is considered that the manual fire extinguishing control function is normal. 5.4.9 Fault monitoring and alarm function test
The power supply of each control channel probe, test lamp, sensor and fire extinguisher bottle is artificially disconnected and short-circuited in turn, the disconnection and short-circuit indicator lights of the test channel are displayed, and the buzzer of the control cabinet sounds, which is considered that the fault monitoring and alarm function is normal. 5.4.10 Locking function test
When the device is in normal working state, operate the channel locking button to lock the channel, use a match or temperature detection simulator to apply a flame signal to the channel, and the wine spray indicator light on the fire extinguisher simulator of the locked channel does not display, which is considered to be a normal locking function. 5.5 Environmental test
The environmental test of the probe and test lamp shall be carried out in accordance with the following method. During and after the test, its mechanical, electrical connections and performance shall remain normal.
5.5.1 High temperature storage test
Test method: Conduct in accordance with GB2423.2.
MT/T 720-1997
Severity: The temperature rises from room temperature to 60℃, and continues to work for 24 hours after stabilization. The test is carried out in a non-working state, and the test is measured after 1 hour of recovery after the test. The performance of the probe and test lamp shall meet the requirements of 4.3. 5.5.2 Low temperature storage test
Test method: Conduct in accordance with GB2423.1.
Severity: The temperature drops from room temperature to -40℃, and continues to work for 24 hours after stabilization. The test is carried out in a non-working state, and the performance of the probe and test lamp shall meet the requirements of 4.3 after recovery for 1 hour. 5.5.3 High temperature working test
Test method: Carry out in accordance with GB2423.2.
Severity: The temperature rises from room temperature to 50℃, and continues to work for 2 hours after stabilization. The test is carried out in a working state, and the performance of the probe and test lamp shall meet the requirements of 4.3. 5.5.4 Low temperature working test
Test method: Carry out in accordance with GB2423.1.
Severity: The temperature drops from room temperature to -30℃, and continues to work for 2 hours after stabilization. The test is carried out in a working state, and the performance of the probe and test lamp shall meet the requirements of 4.3. 5.5.5 Alternating damp heat test
Carry out in accordance with GB2423.4.
Severity: high temperature 40℃, relative humidity 95%, duration 6d. The test is carried out in non-working state, and the performance of the probe and test lamp shall meet the requirements of 4.3 immediately after the test. 5.6 Explosion-proof inspection
It shall be carried out by the explosion-proof inspection department designated by the state in accordance with the relevant provisions of GB3836.1 and GB3836.3. 6 Inspection rules
6.1 The device must be inspected and qualified by the inspection agency designated by the state before it can be put into mass production. 6.2 The device is divided into factory inspection and type inspection. The inspection items are shown in Table 2. Table 2
General inspection
Start-up self-test test
Door lock function test
Automatic detection function test
Manual self-test function test
Power supply automatic conversion alarm function test
Automatic explosion-proof fire extinguishing control function test
Automatic flame-retardant fire extinguishing control function test
Manual fire extinguishing control function test
Fault monitoring alarm function test
Lock function test
Effective detection distance of probe
Test lamp has Effective emission distance
Technical requirements
Test method
Factory inspection
Type inspection
Sensor response temperature
Signal conversion time between probe and cabinet
Opening time of fire extinguisher control valve
Effective spraying time of fire extinguishing agent
High temperature storage test
Low temperature storage test
High temperature working test
Low temperature working test
Alternating damp heat test
Explosion-proof inspection
MT/T 720—1997
Table 2 (end)Www.bzxZ.net
Technical requirements
Note: ① indicates the inspection items that must be carried out, - indicates the inspection items that are not carried out. 6.3 Factory inspection;
Test method
Factory inspection
Type inspection
6.3.1 Each device shall be inspected item by item by the factory quality inspection department according to the factory inspection items specified in Table 2. It can only be shipped after passing the inspection and issuing a certificate of conformity.
6.3.2 If any of the inspection items 2 to 14 in Table 2 fails, the device shall be deemed unqualified. 6.4 Type inspection:
Type inspection is the inspection and test to identify whether the developed prototype or transferred sample meets the requirements of this technical condition. Only after obtaining the inspection certificate issued by the inspection unit designated by the state can it be put into mass production. 6.4.1 The device must be subjected to type test in the following cases: a) When new products or old products are transferred to the factory;
b) When the changes in the structure, process and materials used in the device may affect the product performance; c) When the device is in continuous production, it should be carried out once every 3 years; d) When the product is stopped for more than 1 year and production is resumed; e) When there is a large difference between the results of the factory inspection and the last type inspection; f). When the inspection agency designated by the state deems it necessary. 6.4.2 Products for type inspection shall be randomly sampled from products that have passed the factory inspection, with a quantity of 1 unit. 6.4.3 Type inspection shall be carried out item by item according to the items specified in Table 2. If one item fails, the batch of products shall be judged as unqualified. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Product marking
7.1.1.1 Product marking should be clear, and the handwriting and symbols should be correct and clear; the control cabinet should have a nameplate and "MA" mark in a conspicuous place. 7.1.1.2 The nameplate of the device and each component should include the following contents: a) Name and model;
b) Manufacturer's name;
c) Explosion-proof mark and explosion-proof certificate number;
d) Safety mark and number,
e) Connection mark and number;
f) Product number;
g) Date of manufacture.
7.1.2 Packaging marking
—1997
MT/T 720
7.1.2.1 Packaging, storage and transportation markings should comply with the provisions of GB191. 7.1.2.2 The shipping and receiving marks shall comply with the provisions of GB/T6388. 7.2 Packaging
The products are packed in wooden boxes.
The boxes should be moisture-proof and shock-proof.
The following documents should be attached to the boxes:
a) Packing list (including random accessories);
b) Product certificate;
c) Product instruction manual.
7.3 Transportation
7.3.1 The products are suitable for road, rail, sea or air transportation. 7.3.2 Avoid strong vibration and impact during transportation. 7.4 Storage
The products should be stored in a dry, acid-free, alkali-free and salt-free warehouse with good ventilation. 83
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