Some standard content:
Verification regulation of smoke tester
JJG680—1990
Verification regulation of smoke tester
Verification Regulation cf MeasuringApparatug tor Dust Content inStack.L:680-1990
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The current procedure was approved by the State Administration of Technical Supervision in May 1001 and implemented from January 1, 1950. Responsible unit: Shaanxi Provincial Technical Supervision Bureau
Drafting unit: Shaanxi Provincial Institute of Planning and Testing and Epidemic Prevention This process technical clause is subject to free explanation. The main initiator of this regulation is: Yu Xingdong. Shaanxi Provincial Measurement and Testing Institute (Shaanxi Provincial Metrology and Testing Institute) (Shaanxi Provincial Metrology and Testing Institute) Participating drafters: Liu Guangquan (Institute of Environmental Engineering and Sanitary Engineering, Chinese Academy of Preventive Medicine) (Institute of Environmental Sanitation and Sanitary Engineering, Chinese Academy of Medical Sciences) (Safety and Environmental Protection Research Institute, Ministry of Metallurgy) Technical requirements Three inspection conditions Four inspection items and inspection methods [—] Determination of the current film (II) General performance inspection (III) Determination of defective performance (IV) Correct determination of the setting error of constant velocity lead-in Five conclusions and verification cycle Determination of static sheet drop coefficient
Appendix 2 Determination of correction coefficient of S-type tube
Verification procedure for smoke tester
This specification applies to newly manufactured, in-use and after repair, the sampling is within 6m1./min, and the stability of the service type test model (hereinafter referred to as the test model) of the filter meter is determined: all
The test is used to measure the powder density in the pipe or the exhaust pipe: make a certain bottom volume of gas pass through the reverse or When the membrane is delivered, the dust is determined. According to the sampling rate, the dust quality in the volume of the gas is calculated:
The tester is a device for pumping air, a bucket recording instrument box, a condenser, a dryer, a sample tube, a business or a key computer, etc. Some also have a number of measuring points for storing gas systems: 2. Technical requirements Www.bzxZ.net
1 Appearance of the test station
1 The nameplate should be marked with the name, model, manufacturer name (or factory mark), measurement mark, product factory number, special period and technical indicators.
1.2 All parts should be complete and continuous, and there should be no deformation that affects the use of the report: all buttons are closed without damage and stuck
1.3 The temperature of the tester is equipped! , pressure gauge, flow meter and point gauge values and scales should be clear and colorful, and there should be no defects that are loud enough to read.
2 When the ambient temperature is above 40°C and the relative humidity does not exceed 85%, the insulation resistance between the power supply and the casing shall not be less than 20M.
3 When the test is in normal operation, the average sound pressure level should be lower than 84. The gas system of the tester should be 51kV in the oil and gas industry. The speed of the gas path should not exceed 150Pa in the first minute.
5 The tester used in flammable and explosive gases shall be inspected and certified by the national labor safety department. When the flow rate of the tester reaches 30 [.Ari, the pressure of the evacuation in the gas system should be 20kFa: 6
The pneumatic pump is installed under constant pressure and runs for 30min continuously. The flow fluctuation should not exceed 2L/min. 7
8 The temperature measurement value error of the thermometer in the tester should be within 2. 8.1
9.2 The temperature measurement value error of the thermometer in the temperature measurement device should be within 1. 8.3.1. The allowable error of the thermocouple should not exceed the requirements of the level. The quality assurance grade of the pressure measuring instrument, pressure gauge, vacuum gauge and micromanometer in the tester shall not be lower than Grade 4: the accuracy grade of the micromanometer shall not be lower than Grade 1.5; the accuracy grade of the flow meter (including various types of flowmeters and cumulative filter meters) in the tester shall not be lower than Grade 2.5.
Isokinetic induction error
The relative error of isokinetic induction of the tester is controlled within 5%: 3. Verification conditions
12 Given average
Environmental steam temperature: 10·, during the whole verification process, the temperature changes little, environmental 8U%RE
Atmospheric pressure: 86～106、
Test power supply: AC220120V
Verification equipment
The main instruments and devices for inspection and test are shown in the table below: Pipe installation
Source conditions Sea
Water pressure
Crossing the ocean!
Distribution volume long travel inspection safety long
or standard flow meter
investment card extension
$7 -1nkP::
a-SCC :
price t position.2
n--10kPa;
position center 82
quality low"\
make up or accurate washing plan,
city physical qualification certificate
make note of pressure evaluation
technical request for improvement
relative 6F1in
this is lower than the standard
not lower than + standard
below section:
mimm 13.2 - 3im/g
Low wind system
Verification items and verification methods
(I) Verification items
Business construction 5 performance within the effective range
not more than%
14 For new and repaired components, meet the requirements of 1-Ⅱ: The components in use meet the requirements of 1, 2, 3, 4, 6, 7, 8: 9, 10.
(II) General performance inspection
Daily inspection should meet the requirements of the first series: Insulation
Test position is connected to the position of the minister, not connected to the power supply, use 5V coupons to stimulate its insulation resistance: the components meet the requirements of the first prohibition.
Under normal working conditions, use 2 mass production level meters (337G8-183 specified method to determine: there should be 3 system tightness
Connect the gas system (including cooling device, T case and source measurement device) and start the gas device after the sample is tightly blocked: observe the load "clothes" to the lead P: the left and right calls, and quickly close the previous reading door and shut down the machine, record the reading value of the support meter, and the standard should meet the requirements of Article 4 within 1m. 19 Exhaust Hui
Start the effective tester shaft gas device, the word card flow meter continues to reach 301., the single-ended person 11. Observe the maximum reading value of the point meter, which meets the requirements of Article 6
20 Push the gas to determine
Adjust the sample nozzle's resistance to promote negative pressure to maintain at 13kP: adjust the sinking volume to 01./nn, and continue for 3Umin. The maximum value reached by the single-source data should meet the requirements of Article 7. The tester specially used for dust exhaust duct measurement can be adjusted to about 7k.
2 Measurement performance
The calibration of temperature, pressure, ground volume and other instruments (meters) in the tester shall be carried out in accordance with the national measurement calibration regulations 21
, and the results shall be in accordance with Article ×, 9, and the requirements: (IV) Calibration of constant speed attraction error
22 and measurement of suction speed
22.1 Connect the tester gas system, install a new filter, and remove the medium. If the system is not full of gas, place the sampling tube in the wind tunnel shown in Figure 1, so that the incoming air is parallel to the axis of the load, and the inclination angle is not less than 3; the distance between the sampling tube and the wind speed is not less than 150mm22.2 There are at least 5 test points (5, 10, 15, 20, 25h/5 speed points) in the wind speed range of 5.-25m/, and each point is adjusted by 1m/22.3 Reduce the wind speed room test point. Start the tester after the wind speed is stable; adjust the flow rate to make it reach a normal level, and record the instantaneous flow reading and gas state parameters. 22.4 Calculate the suction speed at the sampling end according to the following formula: -594.59/25m ... |Me:
Receiving speed (
Instantaneous flow rate at equilibrium\reading (1.in: Diameter of inner hole of sampling nozzle (ma):
Absolute temperature of gas in wet stock (:
H--Calibration ring mirror atmosphere positive (Ps):
Static pressure of gas in wind system working stock ():pr
Stock flowmeter front point empty table number (Hu): Instantaneous absolute temperature of gas in front of flowmeter (K) The calibration point is repeated 3 times, and the variation should be less than 0.3m/s: However, the average value is calculated. Variation exceeds--deep sample: 2 Run investment: 3-Year: 4-5 Instrument record sales: 3-Big small total: 6 District month section: 7 Front hole; 8 One clear volume:y—F solution five; 10 degrees; and three F:: static volume E, 1chuan
must be corrected according to the new measurement.
Determination of actual wind speed
refers to the "standard" top fixed core working section of the commissioned sampling tube (see figure) village [2mm, non-near contraction section and not less than ut from the wind tunnel, and then connected to the material micro outlet, measure the dynamic normal production of the gas in the wind tunnel, and calculate the actual wind speed with the following formula: 2
In the formula: - wind working actual wind m (m): K. Degree support section adjustment coefficient:
gas dynamic pressure measured by micromanometer (Fa)
—air safety Actual density (kg)
Static drop method
Use a micromanometer to connect the two holes before and after the wind tunnel contraction: As shown in the figure, the static difference ≥: press to calculate the actual wind pressure
Where: Force—static positive difference before and after the wind tunnel contraction section (a): ?—static pressure drop coefficient;
The symbols have the same meaning as before.
24 Calculation of constant speed attraction error
According to the formula, the relative error of constant reverse attraction at each calibration point is calculated, and the requirements of Article 11 are met, =*=\× 100%
Relative difference of constant speed suction (%:
—the suction rate at the sampling mouth (:wactual speed (m)
25If the wind tunnel is installed lightly, for the dynamic pressure balance type, the instrument body can be used to perform the test directly in the room air. (3:
25. "Install the constant speed sampling filter, remove the desiccant in the dryer: connect the tester gas system, after careful inspection, check whether it is tight and there is no air stagnation,
25.2 Set at least 6 test points in the flow range of 1-60[./mim. After the cut-off, start the tester and adjust the suction Flow to the calibration point 1 and record the differential pressure and temperature of the gas passing through the sampling tube from the instrument's micromanometer.
25.3: Use formula (1) to calculate the suction pressure of the sampling nozzle at each given point, where: T, -T:, can be ignored in the calibration environment.
25.4 Use the differential pressure value generated when the gas passes through the throttling hole of the actual sample as the dynamic pressure, and use formula (2) to calculate the actual wind speed at the corresponding calibration point using the pitot tube, where: K, should be the S-type pitot coefficient that matches the sampling,
2 5,5 Substitute the source and, replace the formula (4, and find out. 5. Verification result processing and verification Zhou Si
26 According to this regulation, the test instrument shall be inspected and the verification certificate shall be issued: if it fails, a verification rate account notice shall be issued. 27 The verification cycle shall not exceed two years. After repair, the inspection shall be renewed. After the inspection certificate is received, the ice can be used for months. 1525
Appendix! Determination of static pressure drop coefficient
1 Take 5 wind seat points evenly within the wind speed range of 5-251m in the low-speed wind flow: 1 At each wind speed point, use two auxiliary pressure gauges to measure the contraction pressure separately. 1. The static difference of the working section from the first section to the last section: and the dynamic pressure of the working section above: Use the following formula to calculate the static pressure drop coefficient of each wind sinking point. Divide the rough difference and find the positive drop coefficient, which is the measured static positive drop coefficient: Appendix 25 Determination of the positive drop coefficient of type pitot tube 1. Use the standard pitot tube and the S-type pitot tube to determine the working surface of the wind market. The outer wall of the two integral tubes is not less than 12mn, so that the total pressure hole of the standard pitot tube is in the direction of the airflow (the deviation angle is not more than 5\) and the distance between the two tubes is less than JOmr
2. At least 5 calibration points can be selected within the wind speed range of 5~25m/%: the adjustment range is ±[m/. Adjust from the abandoned and low wind speed values to the calibration point 1 respectively. After the airflow is stable, record the two pressure relief or wind speed values measured by the standard pitot tube and the S-type pitot tube respectively, and collect the average value. The following formula is used to calculate the S-type pitot correction coefficient = .
In the formula: K. Standard pitot correction coefficient: a\—the dynamic pressure value (Pu) measured by the standard pitot tube and S-type pitot tube at the stable point: :\——the wind speed value (m) measured by the standard non-pitot tube and S-type virtual tube at the calibration point, 4 The K value of each calibration point E is measured at the desired point, and the variation of J shall not exceed 0.0: After expansion, the average value is calculated as the S-type pitot correction coefficient:
5 The two measuring holes of the S double pitot tube are rotated in the direction, and the hole for measuring the total pressure originally faces the airflow, while the hole for measuring the airflow before the stop is measured, and the K value is measured. The cumulative difference between the two nets should be less than .01. If the flow field uniformity is greater than 0.5%, the standard pitot tube should be swapped with the S-type pitot tube; repeat the above steps and calculate the correction coefficient again: the average of the two multiplications is used as the cumulative correction factor for the pitot tube.5%, the standard pitot tube should be swapped with the S-type pitot tube; repeat the above steps and calculate the correction coefficient again: the average of the two multiplications is used as the cumulative correction factor for the pitot tube.5%, the standard pitot tube should be swapped with the S-type pitot tube; repeat the above steps and calculate the correction coefficient again: the average of the two multiplications is used as the cumulative correction factor for the pitot tube.
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