Some standard content:
National Metrology Verification Regulation of the People's Republic of China JJG 168—2005
Vertical Metal Tank Capacity2005-09-05 Issued
Implementation on 2006-03-05
The General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China issued JJG168—2005
Verification Regulation of
Vertical Metal TankCapacity
JJG 168—-2005
Replaces JJG168-
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on September 5, 2005, and came into effect on March 5, 2006.
Responsible unit: National Technical Committee for Flow and Capacity Measurement Main drafting unit: National Human Capacity No. 1 Measurement Station of China Institute of Metrology
National Large Capacity No. 1 Measurement Station
The technical provisions of this regulation shall be interpreted by the National Technical Committee for Flow and Capacity Measurement Main drafters of this regulation:
Liu Ziyong
Tong Mingxing
Participating drafters:
Sun Jinge
Zhong Jianguo
Blood Snow Song
JJG 168—20-05
(China Institute of Metrology:
(National Human Capacity No.1 Measuring Station)
(National Large Capacity No.2 Measuring Station)
(National Large Capacity No.1 Measuring Station)
(National Large Capacity No.2 Measuring Station)
(National Large Capacity No.1 Measuring Station)
(China Institute of Metrology)
References
3 Terms
4 Overview Description
Vertical Jinping Tank Structure
Metal Purpose
4,3Vertical Metal Tank Verification Principle.
5Metric Performance Requirements"
Verification Result Expanded Uncertainty Requirements
5.2Tank Ovality Requirements
5.3Tank Inclination Requirements
6General Technical Requirements...
Tank Key Construction Requirements
6.2Metric Height Requirements
6,3 Requirements for measuring groove
6.4 Requirements for measuring plate·
Requirements for stability of tank bottom plate
Requirements for measuring position of base circle diameter
Control of measuring instrument
Verification conditions...
Verification items
Verification method·
Data processing·
Compilation of capacity table
Processing of measurement results
Verification period
Appendix A
Self-calibration method of optical plumb line
Self-calibration method of level
Appendix B
JJG 168-—2005
Appendix℃
Measurement method of optical radial deviation measuring instrument for guide railsAppendix D
Measurement method of double-disc external floating item
Appendix E
Reference format and sample data of picking record
Format of inner page of calibration certificate and sample calculation resultsAppendix F
Appendix G
Appendix H
Reference format of capacity table (I) and sample calculation resultsReference format of capacity table (II)
JJG 168—2005
Vertical Metal Tank Capacity Verification Procedure
This procedure is equivalent to the International Recommendation No. 71 “Fixed Storage Tanks General Requirements”, JS07507.1:1993 “Petroleum and Liquid Petroleum Products-Vertical Circular Simple Tanks Calibration (Measuring Method)” and IS07507.2:1903 “Petroleum and Liquid Petroleum Products-Vertical Cylindrical Tanks Calibration (Optical Reference Line Method). 1 Scope
This procedure is applicable to the initial verification, subsequent verification and in-service inspection of vertical metal tanks (including floating roofs) with a capacity greater than 20m.
2 References
OlMl, International Recommendation No. 71 “Fixed Storage Tanks General Requirements” General requirements for fixed storage tanks
AMPMS Chapter 12.1 Static oil volume calculation IS07507.1: 1993 Petroleum and liquid petroleum products - Calibration of vertical cylindrical oil tanks (circumferential measurement method)
GB/T13235.1-1991 Petroleum and liquid petroleum products - Calibration method of volume of vertical cylindrical metal oil tanks (optical reference line method)
GB/T13235.2-1991 Petroleum and liquid petroleum products - optical reference line method)
Calibration method of volume of vertical cylindrical metal tanks (optical reference line method)
When using this procedure, attention should be paid to the use of the current valid versions of the above-mentioned references. 3 Terminology
3.1 Measuring port
A support port on the top of the tank for sampling, gauge checking and temperature measurement. 3.2 Measuring plate
A horizontal metal plate located below the stop of the metering port that supports the dipstick hammer during gauge checking. It is the positioning plate for the lower metering reference point.
3.3 Upper metering reference point (gauging point)
The intersection of the upper edge of the vertical line of the lower gauge groove in the main metering port, also known as the gauge checking point. 3.4 Lower metering reference point (case point)
The intersection of the free vertical line through the upper gauge point and the surface of the gauge plate, also known as the zero point, 3.5 Reference degree (gauging point height)
The vertical distance between the upper metering reference point and the lower metering reference point. 3.6 Minimum measurement volume
The minimum volume of liquid discharged or injected into the tank during the receiving and dispatching operation. Generally, it is the value corresponding to the liquid level height
3.7 Base circle
JJG 168--2005
To calculate the circumference or diameter of other ring plates, it is necessary to use the circumference of a certain position as a basis for comparison with other circumferences. This circumference is called the base circle.
3.8 Radial deviation
The difference between the radius of the plate and the radius of the base circle.
3.9 Reference horizontal plane
When measuring the starting and ending heights of the tank bottom and the accessories in the tank, the horizontal plane formed by the horizontal rotation of the sighting axis of the mountain level or by the filling liquid.
3. Bottom volume
The volume below the highest point of the tank bottom.3.11 Volume
The volume below the highest point of the tank bottom.3,12 Accessory volume
The volume occupied by the assembly parts that affect the tank capacity. When its volume increases the effective volume of the tank, it is called positive volume; when its volume reduces the effective volume of the tank, it is called negative volume. 3.13 Elevation
The height from a certain point to the reference level measured by the level and elevation. 3,14 Inverted ruler
When the height of the measuring point is above the reference horizontal plane, the zero point of the elevation ruler must be turned upward, called inverted ruler.3.15 Floating roof (pan)
A sealed cover made of metal or other materials that floats on the surface of the liquid. The floating roof (pan) can float with the rise and fall of the liquid surface. When the liquid level drops to a certain height, the floating roof (pan) is supported by pillars. 3.16 Ruler method
The method of measuring the circumference of each ring plate directly by a steel tape measure to obtain the diameter of each ring plate, or measuring the circumference of the tank inside, also known as the internal measurement ruler method,
3.17 Optical plumb line method
The vertical reference light formed by the optical plumb line is called the optical plumb line. The radial deviation is measured by the optical plumb line, which is called the optical plumb line method. 3.18 Total station method
The method of measuring the diameter and height of each ring plate by using the electronic angle measurement, distance measurement and automatic data processing functions of the total station.
3.19 Horizontal measuring station
The radial deviation measurement position set in the vertical direction. 3.20 Vertical measuring point
Corresponding to the horizontal measuring station, the measurement position set in the vertical direction. 2
4 Overview
4.1 Vertical metal tank structure
JJG 168—2005
Vertical metal tank (including float) is connected by several layers of ring plates. The vertically installed cylindrical metal tank is composed of tank bottom, tank wall, top or float (dish), meter port, inlet and outlet pipelines and other accessories. 4.2 Application of vertical metal tanks
Vertical metal tanks are important measuring instruments for trade settlement, delivery and collection of petroleum, liquid petroleum products and other liquid goods.
4.3 Verification principle of vertical metal tanks
The vertical metal tank body should be a simple circle under ideal conditions, divided into several layers, from bottom to top, called the first circle plate, the first circle plate, and the nth plate. The capacity V of each circle plate is V.=d'h
Where:
d,-Inner diameter of the i-th attic plate, mm;
h, -Inner height of the i-th tunnel plate, mm;
i=1, 2, 3, n—is the serial number of the ring plate. (1)
Considering the correction value of the elastic deformation of the tank wall caused by the static pressure of the liquid and the volume of the accessories in the tank. The total capacity V of the tank is
where: AV
FV + AV, + Aya+Avh + AV.
Correction value of liquid static pressure capacity;
Volume of the accessories in the tank. When its volume increases the effective capacity, it is a positive value: otherwise, it is a negative value;
Capacity of the tank bottom:
Correction value of the tilt
5 Metrological performance requirements
5.1 Requirements for the expanded uncertainty of the inspection results
Vertical metal tank with a capacity of 20m~1100m (including 100m) For vertical metal tanks with a capacity of 100 to 700 m2 (including 700 m2), the expanded uncertainty of the total capacity after verification is 0.3% (h=2); for vertical metal tanks with a capacity of more than 700 m2, the expanded uncertainty of the total capacity after verification is 0.1% (=2)
5.2 Tank body ovality requirements
The roundness of the newly built tank body shall not exceed 1%. 5.3 Tank body inclination requirements
The tank body inclination shall not exceed 1°.
6 General Technical Requirements
6.1 Construction Requirements
JJG 168—24H05
The tank should be constructed in accordance with the correct engineering specifications and should meet the relevant safety requirements for oil; there should be a permanent nameplate at a conspicuous position on the tank body, which should indicate: the name of the oil tank, specification model, equipment number, manufacturer, construction date, etc.; the tank body should have sufficient strength, and under normal circumstances, there should be no permanent deformation that affects the capacity: for floating roof tanks. The floating roof should be guaranteed to move freely up and down with the liquid level. 6.2 Reference Height Requirements
No matter how the liquid content and temperature in the tank change, the reference height is only allowed to have a slight change, and the impact of this change on the measurement uncertainty can be ignored. 6.3 Requirements for the lower groove of the measuring port
The measuring tank must have a lower groove to determine the measuring position. 6.4 Requirements for the measuring plate
The measuring plate must be installed and the lower measuring reference point must be located on the measuring plate. 6.5 Requirements for the stability of the tank bottom plate
The tank foundation must be stable, and no gap between the tank foundation and the bottom plate that affects the measurement uncertainty is allowed. 6.6 Requirements for the base circle diameter measurement position
The base diameter measurement position is 100mm below 3/4 of the outer or inner height of the first circle plate: no obstacles are allowed at this position .
7 Metering equipment control
The metering equipment control includes: initial calibration, subsequent calibration and in-use inspection. 7.1 Inspection conditions
7.1.1 Calibration environment requirements
The calibration should be carried out in non-rainy weather, with wind force not exceeding level 4 and relative humidity not exceeding 85%. 7.1.2 Calibration technical requirements
7.1.2.1 The newly built or rebuilt tank must be subjected to the first calibration after the water pressure test. The water pressure test should be filled with water to more than 80% of the total capacity of the tank, and the stabilization time should be no less than 721, and the discharge During the subsequent calibration, if the liquid in the tank: the difference between the gas phase temperature and the liquid phase temperature in the tank shall not exceed 10, otherwise the tank should be emptied or filled before calibration. No sending and receiving operations are allowed during the calibration process. 7.1.2.2 Calibration should generally be carried out continuously. If it is interrupted due to interference, it can continue, but it must be done as follows: a. The average temperature difference between the liquid and the air temperature before and after the interruption should be within 10°C. b. The height of the liquid level in the tank should be basically consistent with that before the interruption. If there are changes in the instrument and personnel, point recheck measurements should be carried out to ensure that the measurements before and after the interruption are the same. Continuity of measurement results.
d. The measurement record before interruption must be smooth and clear 7.1.2.3 If the tank body is obviously deformed, it should be noted in the record, and a sketch of the deformed part should be drawn. The number of measurement points should also be increased to achieve the required uncertainty. 7.1.3 Verification safety requirements
7.1.3.1 During the entire verification process, relevant safety regulations must be followed 7.1.3.2 When entering the tank to measure the plate, the concentration of harmful gases in the tank must comply with safety regulations and obtain entry permission from the safety department of the inspection unit.
JJG 168—2005
7.1.3,3 Close all pipelines in and out of the tank to ensure that there is no leakage. The electrical equipment used should meet the explosion-proof requirements. 7.1.3.43
1.1.3.5 The inspection personnel must wear safety flags, carefully check the escalator and the guardrails on the tank top and other accessories attached to the wall or tank top that can be inspected, and determine whether they are firm to ensure the safety of the inspection personnel and instruments. 7.1.3.6 The clothes, shoes and hats carried by the inspection personnel must comply with relevant regulations to avoid the generation of static electricity and sparks. 7.1.3.7 When the aerial workers use the hanger or hanging chair, the pulleys, ropes, etc. must be carefully checked before installation, and after installation, they must also be checked for reliability. A firm and wear-resistant safety belt should be used. If scaffolding is required during inspection, steel pipes, round materials and other materials can be used for overlap, and they should be installed firmly. 7.1.4 Verification equipment
Verification equipment and main technical parameters are shown in Table 1 and Table 2. The equipment in Table 1 must be qualified after verification and can be used within the verification period.
Main calibration equipment and technical parameters
Equipment name
Steel tape measure
Optical plumb line
True guide optical radial
Deviation measuring instrument
Mobile radial deviation
Measuring instrument
Automatic leveling instrumentbZxz.net
Ultrasonic thickness gauge
Force gauge
Standard ruler
Thermohygrometer
Standard metal instrument
Flow meter
Total station
Laser distance meter
Measuring range
(050）m
(0 -100) m
(0 ~ 150) m
(0 - 25) m
[0.9 ~25) m
(0 -180) mm
(0 300) mm
(1 ~ 50) m
Meets the requirements
(0 98) N
(0-2) m
-20% - 50℃
10% RH ~ 90% RIH
100L~2000L
Meets the requirements
1.7m - 80l
0.5m~100m
Accuracy grade or maximum allowable error
Within the specified measurement range (>20m):
Resolution is 1mr, maximum error of vertical single drinking measurement is less than ±2m
± (1%L+0.1) mm
Minimum graduation value 1.96N
(2+2×10L)mm
Note: L is the distance, unit m
The calibration certificate of the steel tape measure must have a positive value in meters, must be static when used
must be corrected when used
Automatic compensation
Used with optical plumb line gauge
Automatic compensation
Using temperature -20% 50 yuan
Minimum graduation value Irm, used with water
Equipment name
Steel ruler
Clamp
Explosion-proof lamps
Water (oil) distance test
Span gauge
Magnetic table base
Computer and printer
Capacity table calculation software
7.2 Verification items
Verification items are shown in Table 3.
Verification items
Appearance and general performance inspection
Diameter measurement of drawing plate
Height of each measuring plate, total height and plate thickness measurement
Bottom measurement
Tilt measurement
Tank ellipse measurement
Reference height measurement
Internal accessories measurement
Floating roof measurement
JJC168-2005
Table 2 Supporting equipment
Model and specification
Meet the requirements
500mm ~ 1000mm
Meet the requirements of explosion-proof places
Meet the requirements
Vertical suction is not less than 588N
Meet the requirements
Texture is cotton, linen
More than 2
Mathematical model must meet the calculation requirements of this regulation Table 3 List of vertical thick steel tank inspection items
First inspection
Note: "+" in the table indicates items that need to be inspected; '7.3 Inspection method
External regulations and general performance inspection
Subsequent inspection
" indicates items that do not need to be inspected
Observe the construction of the tank body, which should meet the requirements of 6.1. 7.3.1.1
Requirements.
Check the reference height, which should meet the requirements of 6.2. Check the metering port, which should have a lower scale groove to meet the requirements of 6.3. Inspection in use
Check whether the metering plate is installed on the bottom of the tank, and make the lower metering reference point on the metering plate, which should meet the requirements of JIG 168-2005 in 6.4.3.1.5 Enter the tank, walk on the bottom plate, and observe whether the tank foundation and the tank bottom plate are stable. The fan meets the requirements of 6.5.
7.3.1.6 Observe the 3/4 of the outer height or inner height of the first circular plate, 100 mm above and below, at the H position: no obstacles are allowed to exist, which should meet the requirements of 6.6.
7.3.2 Ring plate diameter measurement
7.3.2.1 Circumference ruler method
(1) Position selection: The first circle plate is measured at 3/4 of the plate height, and the other circle plates are measured around two circles, the positions are as follows:
The first line is at 1/4 of the plate height:
The second line is at 3/4 of the circle plate height;
If it is not possible to measure the circle at the selected position, you can measure near this position. (2) According to the selected circumference ruler position, use a colored pen to make horizontal marks on the tank wall every 1.0m to 1.5m as the national ruler track, and remove the debris that affects the measurement result on the circumference ruler track to ensure that the steel tape measure is close to the tank wall during measurement. Fix the head of the steel tape measure with a magnetic base or other means, put the tape measure along the tank wall, make the tape close to the tank wall and roughly around the circumference ruler track, and fix it with a magnetic base for about 5 minutes to make the tape measure and the tank reach temperature equilibrium to eliminate the measurement error caused by the temperature difference between the tape measure and the tank wall. When the tank wall is made of non-carbon steel or other materials, the tank wall temperature, material and linear expansion coefficient should be recorded.
(3) At a place 300mm away from the vertical weld or other obstacles on the circumference track, use a steel needle to draw a thin line perpendicular to the circumference track on the tank wall as the circumference starting vertical line, overlap the cold scale line of the steel scale with the starting vertical line, and fix the tape with a magnetic base or other methods. At a distance of no more than 3m from the magnetic base, use a measuring tool to clamp the tape, and use a tensile gauge to apply the same tension to the tape as in the scale inspection state. At the same time, observe whether the zero scale of the tape and the starting vertical line are displaced. If there is displacement, increase the number of months of the magnetic base and re-measure. If there is no displacement, this point is used as the circumference starting point.
(4) From the starting point of the scale, along the circumference track, at intervals not exceeding 3m, use the clamp and the tensioner to apply the same tension as in the calibration state to the scale tape along the line direction of the tank wall, fix the scale tape with a magnetic base or other method until the starting point, and read the estimated reading to 0.5m. During the measurement process, the upper edge of the scale tape should always be aligned with the circumference track. At the end of each measurement process, check whether the zero scale line of the scale tape has shifted. If there is any displacement, re-measure. (5) Break off the first starting point of the ruler and establish a new starting point at least 300 mm away. Perform the second measurement according to steps (3) and (4). The results of the two measurements should not be greater than the tolerance specified in Table 4: Table 4 Tolerance for circumference (centre) measurement
100m<centre≤200m
C>200m
(6) If the results of the two measurements exceed the specified tolerance, continue measuring until the results of two consecutive measurements meet the specified tolerance. The average of the two measurements is the circumference of the position. (7) Measure the positions of the circumference of each plate selected in (1) one by one to obtain the outer circumference length of each plate at 1/4 and the outer circumference centroid at 3/4.
7.3.2.2 Optical plumb line method
(1) Base circle measurement
J1G 162M5
Base circle measurement includes ruler method and inner ruler method. The outer ruler method is shown in 7.3.2.1. The base circle is 3/4 of the first plate. If this position cannot be measured, the 1/4 of the first plate can be selected as the base circle. When the optical method is used for external measurement, internal measurement can be carried out. The inner ruler method is used to measure the circumference of the base circle. The method is as follows: The ruler position of the inner ruler method is the same as that of the outer ruler method. Clear the tank wall obstacles within this position and draw the trajectory of the base circle. At a distance of more than 300mm from the vertical weld, use a steel tape to draw a thin line perpendicular to the circumference trajectory of the base circle as the starting vertical line. Align the zero scale line of the steel tape with the starting vertical line. The upper edge of the tape should be aligned with the lower edge of the horizontal line of the circumference trajectory. Place the tape against the tank wall and fix it with a magnetic base or other method. Use a steel ruler to press the tape in sequence to make it fit tightly against the tank wall. The length of each press is no more than 1m. Each time it is pressed, the end of the laid tape is fixed with a magnetic base or other method. During the laying process, if the tape moves, it should be laid again in front of the nearest magnetic base until the initial starting vertical line. After laying the tape to the initial starting point, read the tape reading corresponding to the starting vertical line and estimate it to 0.5mm: re-establish the starting point at a horizontal position 300mm above the starting vertical line and re-measure according to the above steps. The two measurement results should meet the requirements of 7.3.2.1, (5). The average value is taken as the inner circumference of the toilet. (2) When measuring the diameter of the plate at each circumference, an optical calibrator is used. If conditions permit, a guide rail optical radial deviation measuring instrument is also used. The measurement method of the guide rail optical radial deviation measuring instrument is shown in Appendix (, &) The establishment of horizontal measuring stations, according to the deformation of the tank body, determines the number of horizontal measuring stations, and the total number should be an even number. When the circumference is less than or equal to 100m, the arc length of adjacent horizontal measuring stations shall not exceed 3m, and the minimum number of measuring points shall not be less than 12 points; when the circumference is greater than 100m, the arc length of adjacent horizontal measuring stations shall not exceed 4m, and the minimum number of measuring points shall not be less than 36 points. The horizontal measuring stations should be evenly distributed along the circumference. The distance from any poly weld in the vertical direction shall not be less than 30 mm. They shall not be affected by obstacles. If affected, the horizontal measuring stations shall be adjusted appropriately. h) The vertical measuring base points shall be selected on the trajectory of the base circle and at 1/4 and 3/4 of the height of each ring plate respectively. d) The optical plumb line shall be calibrated before use. The calibration method is shown in Appendix A. d) Install the optical plumb line at the first horizontal measuring station, fix the pulley at the top of the tank, hang the mobile inter-diameter deviation measuring instrument with a rope, and adjust the pulley position so that it is directly above the optical plumb line. Adjust the direction of the optical plumb line so that the horizontal line of the line in the mirror is aligned with the scale line of the ruler. Rotate the focus knob so that the scale line of the ruler is clearly displayed in the eyepiece and read the value (see Figure 1). Keep the optical plumb line stationary, pull the rope to make the mobile radial deviation measuring instrument move upward in the vertical direction, stop at the vertical measuring point of each ring plate (see Figure 2), and read the readings of the mobile radial deviation measuring instrument scale of each ring plate one by one. After the measurement of each vertical measuring point on the first horizontal measuring station is completed, move the entire set of measuring equipment to the lower horizontal measuring station. According to the above steps, measure the radial deviation of all vertical measuring points on each horizontal measuring station one by one until all are completed: When internal measurement is required, fix the pulley on the support rod 1 and stand the support rod inside the tank with the top of the support rod against the wall, and measure according to (2) in 7.3.2.2. 7.3.2.3 Total station method
Stably install the instrument on the angle bracket at the bottom of the tank or the approximate geometric center of the floating plate, adjust the level, input the measurement point position parameters, and use the electronic angle measurement, distance measurement and automatic data processing functions of the total station to measure the diameter of each ring plate in real time, 82. Check the cut-off metering port, which should have a lower metering groove, in accordance with 6.3. Inspection during use
Check whether the metering plate is installed on the bottom of the tank, and make the lower metering reference point located on the metering plate, which should comply with 6.4 of JIG 168—2005
.3.1.5 Enter the tank, walk on the bottom plate, and observe whether the tank foundation and the tank bottom plate are stable, which should comply with 6.5 requirements.
7.3.1.6 Observe the 3/4 of the outer height or inner height of the first circular plate, 100 mm above and below, at the H position: no obstacles are allowed, which should comply with 6.6 requirements.
7.3.2 Ring plate diameter measurement
7.3.2.1 Circumference ruler method
(1) Position selection: The first circle plate is measured at 3/4 of the plate height, and the other circle plates are measured around two circles, the positions are as follows:
The first line is at 1/4 of the plate height:
The second line is at 3/4 of the circle plate height;
If it is not possible to measure the circle at the selected position, you can measure near this position. (2) According to the selected circumference ruler position, use a colored pen to make horizontal marks on the tank wall every 1.0m to 1.5m as the national ruler track, and remove the debris that affects the measurement result on the circumference ruler track to ensure that the steel tape measure is close to the tank wall during measurement. Fix the head of the steel tape measure with a magnetic base or other means, put the tape measure along the tank wall, make the tape close to the tank wall and roughly around the circumference ruler track, and fix it with a magnetic base for about 5 minutes to make the tape measure and the tank reach temperature equilibrium to eliminate the measurement error caused by the temperature difference between the tape measure and the tank wall. When the tank wall is made of non-carbon steel or other materials, the tank wall temperature, material and linear expansion coefficient should be recorded.
(3) At a place 300mm away from the vertical weld or other obstacles on the circumference track, use a steel needle to draw a thin line perpendicular to the circumference track on the tank wall as the circumference starting vertical line, overlap the cold scale line of the steel scale with the starting vertical line, and fix the tape with a magnetic base or other methods. At a distance of no more than 3m from the magnetic base, use a measuring tool to clamp the tape, and use a tensile gauge to apply the same tension to the tape as in the scale inspection state. At the same time, observe whether the zero scale of the tape and the starting vertical line are displaced. If there is displacement, increase the number of months of the magnetic base and re-measure. If there is no displacement, this point is used as the circumference starting point.
(4) From the starting point of the scale, along the circumference track, at intervals not exceeding 3m, use the clamp and the tensioner to apply the same tension as in the calibration state to the scale tape along the line direction of the tank wall, fix the scale tape with a magnetic base or other method until the starting point, and read the estimated reading to 0.5m. During the measurement process, the upper edge of the scale tape should always be aligned with the circumference track. At the end of each measurement process, check whether the zero scale line of the scale tape has shifted. If there is any displacement, re-measure. (5) Break off the first starting point of the ruler and establish a new starting point at least 300 mm away. Perform the second measurement according to steps (3) and (4). The results of the two measurements should not be greater than the tolerance specified in Table 4: Table 4 Tolerance for circumference (centre) measurement
100m<centre≤200m
C>200m
(6) If the results of the two measurements exceed the specified tolerance, continue measuring until the results of two consecutive measurements meet the specified tolerance. The average of the two measurements is the circumference of the position. (7) Measure the positions of the circumference of each plate selected in (1) one by one to obtain the outer circumference length of each plate at 1/4 and the outer circumference centroid at 3/4.
7.3.2.2 Optical plumb line method
(1) Base circle measurement
J1G 162M5
Base circle measurement includes ruler method and inner ruler method. The outer ruler method is shown in 7.3.2.1. The base circle is 3/4 of the first plate. If this position cannot be measured, the 1/4 of the first plate can be selected as the base circle. When the optical method is used for external measurement, internal measurement can be carried out. The inner ruler method is used to measure the circumference of the base circle. The method is as follows: The ruler position of the inner ruler method is the same as that of the outer ruler method. Clear the tank wall obstacles within this position and draw the trajectory of the base circle. At a distance of more than 300mm from the vertical weld, use a steel tape to draw a thin line perpendicular to the circumference trajectory of the base circle as the starting vertical line. Align the zero scale line of the steel tape with the starting vertical line. The upper edge of the tape should be aligned with the lower edge of the horizontal line of the circumference trajectory. Place the tape against the tank wall and fix it with a magnetic base or other method. Use a steel ruler to press the tape in sequence to make it fit tightly against the tank wall. The length of each press is no more than 1m. Each time it is pressed, the end of the laid tape is fixed with a magnetic base or other method. During the laying process, if the tape moves, it should be laid again in front of the nearest magnetic base until the initial starting vertical line. After laying the tape to the initial starting point, read the tape reading corresponding to the starting vertical line and estimate it to 0.5mm: re-establish the starting point at a horizontal position 300mm above the starting vertical line and re-measure according to the above steps. The two measurement results should meet the requirements of 7.3.2.1, (5). The average value is taken as the inner circumference of the toilet. (2) When measuring the diameter of the plate at each circumference, an optical calibrator is used. If conditions permit, a guide rail optical radial deviation measuring instrument is also used. The measurement method of the guide rail optical radial deviation measuring instrument is shown in Appendix (, &) The establishment of horizontal measuring stations, according to the deformation of the tank body, determines the number of horizontal measuring stations, and the total number should be an even number. When the circumference is less than or equal to 100m, the arc length of adjacent horizontal measuring stations shall not exceed 3m, and the minimum number of measuring points shall not be less than 12 points; when the circumference is greater than 100m, the arc length of adjacent horizontal measuring stations shall not exceed 4m, and the minimum number of measuring points shall not be less than 36 points. The horizontal measuring stations should be evenly distributed along the circumference. The distance from any poly weld in the vertical direction shall not be less than 30 mm. They shall not be affected by obstacles. If affected, the horizontal measuring stations shall be adjusted appropriately. h) The vertical measuring base points shall be selected on the trajectory of the base circle and at 1/4 and 3/4 of the height of each ring plate respectively. d) The optical plumb line shall be calibrated before use. The calibration method is shown in Appendix A. d) Install the optical plumb line at the first horizontal measuring station, fix the pulley at the top of the tank, hang the mobile inter-diameter deviation measuring instrument with a rope, and adjust the pulley position so that it is directly above the optical plumb line. Adjust the direction of the optical plumb line so that the horizontal line of the line in the mirror is aligned with the scale line of the ruler. Rotate the focus knob so that the scale line of the ruler is clearly displayed in the eyepiece and read the value (see Figure 1). Keep the optical plumb line stationary, pull the rope to make the mobile radial deviation measuring instrument move upward in the vertical direction, stop at the vertical measuring point of each ring plate (see Figure 2), and read the readings of the mobile radial deviation measuring instrument scale of each ring plate one by one. After the measurement of each vertical measuring point on the first horizontal measuring station is completed, move the entire set of measuring equipment to the lower horizontal measuring station. According to the above steps, measure the radial deviation of all vertical measuring points on each horizontal measuring station one by one until all are completed: When internal measurement is required, fix the pulley on the support rod 1 and stand the support rod inside the tank with the top of the support rod against the wall, and measure according to (2) in 7.3.2.2. 7.3.2.3 Total station method
Stably install the instrument on the angle bracket at the bottom of the tank or the approximate geometric center of the floating plate, adjust the level, input the measurement point position parameters, and use the electronic angle measurement, distance measurement and automatic data processing functions of the total station to measure the diameter of each ring plate in real time, 82. Check the cut-off metering port, which should have a lower metering groove, in accordance with 6.3. Inspection during use
Check whether the metering plate is installed on the bottom of the tank, and make the lower metering reference point located on the metering plate, which should comply with 6.4 of JIG 168—2005
.3.1.5 Enter the tank, walk on the bottom plate, and observe whether the tank foundation and the tank bottom plate are stable, which should comply with 6.5 requirements.
7.3.1.6 Observe the 3/4 of the outer height or inner height of the first circular plate, 100 mm above and below, at the H position: no obstacles are allowed, which should comply with 6.6 requirements.
7.3.2 Ring plate diameter measurement
7.3.2.1 Circumference ruler method
(1) Position selection: The first circle plate is measured at 3/4 of the plate height, and the other circle plates are measured around two circles, the positions are as follows:
The first line is at 1/4 of the plate height:
The second line is at 3/4 of the circle plate height;
If it is not possible to measure the circle at the selected position, you can measure near this position. (2) According to the selected circumference ruler position, use a colored pen to make horizontal marks on the tank wall every 1.0m to 1.5m as the national ruler track, and remove the debris that affects the measurement result on the circumference ruler track to ensure that the steel tape measure is close to the tank wall during measurement. Fix the head of the steel tape measure with a magnetic base or other means, put the tape measure along the tank wall, make the tape close to the tank wall and roughly around the circumference ruler track, and fix it with a magnetic base for about 5 minutes to make the tape measure and the tank reach temperature equilibrium to eliminate the measurement error caused by the temperature difference between the tape measure and the tank wall. When the tank wall is made of non-carbon steel or other materials, the tank wall temperature, material and linear expansion coefficient should be recorded.
(3) At a place 300mm away from the vertical weld or other obstacles on the circumference track, use a steel needle to draw a thin line perpendicular to the circumference track on the tank wall as the circumference starting vertical line, overlap the cold scale line of the steel scale with the starting vertical line, and fix the tape with a magnetic base or other methods. At a distance of no more than 3m from the magnetic base, use a measuring tool to clamp the tape, and use a tensile gauge to apply the same tension to the tape as in the scale inspection state. At the same time, observe whether the zero scale of the tape and the starting vertical line are displaced. If there is displacement, increase the number of months of the magnetic base and re-measure. If there is no displacement, this point is used as the circumference starting point.
(4) From the starting point of the scale, along the circumference track, at intervals not exceeding 3m, use the clamp and the tensioner to apply the same tension as in the calibration state to the scale tape along the line direction of the tank wall, fix the scale tape with a magnetic base or other method until the starting point, and read the estimated reading to 0.5m. During the measurement process, the upper edge of the scale tape should always be aligned with the circumference track. At the end of each measurement process, check whether the zero scale line of the scale tape has shifted. If there is any displacement, re-measure. (5) Break off the first starting point of the ruler and establish a new starting point at least 300 mm away. Perform the second measurement according to steps (3) and (4). The results of the two measurements should not be greater than the tolerance specified in Table 4: Table 4 Tolerance for circumference (centre) measurement
100m<centre≤200m
C>200m
(6) If the results of the two measurements exceed the specified tolerance, continue measuring until the results of two consecutive measurements meet the specified tolerance. The average of the two measurements is the circumference of the position. (7) Measure the positions of the circumference of each plate selected in (1) one by one to obtain the outer circumference length of each plate at 1/4 and the outer circumference centroid at 3/4.
7.3.2.2 Optical plumb line method
(1) Base circle measurement
J1G 162M5
Base circle measurement includes ruler method and inner ruler method. The outer ruler method is shown in 7.3.2.1. The base circle is 3/4 of the first plate. If this position cannot be measured, the 1/4 of the first plate can be selected as the base circle. When the optical method is used for external measurement, internal measurement can be carried out. The inner ruler method is used to measure the circumference of the base circle. The method is as follows: The ruler position of the inner ruler method is the same as that of the outer ruler method. Clear the tank wall obstacles within this position and draw the trajectory of the base circle. At a distance of more than 300mm from the vertical weld, use a steel tape to draw a thin line perpendicular to the circumference trajectory of the base circle as the starting vertical line. Align the zero scale line of the steel tape with the starting vertical line. The upper edge of the tape should be aligned with the lower edge of the horizontal line of the circumference trajectory. Place the tape against the tank wall and fix it with a magnetic base or other method. Use a steel ruler to press the tape in sequence to make it fit tightly against the tank wall. The length of each press is no more than 1m. Each time it is pressed, the end of the laid tape is fixed with a magnetic base or other method. During the laying process, if the tape moves, it should be laid again in front of the nearest magnetic base until the initial starting vertical line. After laying the tape to the initial starting point, read the tape reading corresponding to the starting vertical line and estimate it to 0.5mm: re-establish the starting point at a horizontal position 300mm above the starting vertical line and re-measure according to the above steps. The two measurement results should meet the requirements of 7.3.2.1, (5). The average value is taken as the inner circumference of the toilet. (2) When measuring the diameter of the plate at each circumference, an optical calibrator is used. If conditions permit, a guide rail optical radial deviation measuring instrument is also used. The measurement method of the guide rail optical radial deviation measuring instrument is shown in Appendix (, &) The establishment of horizontal measuring stations, according to the deformation of the tank body, determines the number of horizontal measuring stations, and the total number should be an even number. When the circumference is less than or equal to 100m, the arc length of adjacent horizontal measuring stations shall not exceed 3m, and the minimum number of measuring points shall not be less than 12 points; when the circumference is greater than 100m, the arc length of adjacent horizontal measuring stations shall not exceed 4m, and the minimum number of measuring points shall not be less than 36 points. The horizontal measuring stations should be evenly distributed along the circumference. The distance from any poly weld in the vertical direction shall not be less than 30 mm. They shall not be affected by obstacles. If affected, the horizontal measuring stations shall be adjusted appropriately. h) The vertical measuring base points shall be selected on the trajectory of the base circle and at 1/4 and 3/4 of the height of each ring plate respectively. d) The optical plumb line shall be calibrated before use. The calibration method is shown in Appendix A. d) Install the optical plumb line at the first horizontal measuring station, fix the pulley at the top of the tank, hang the mobile inter-diameter deviation measuring instrument with a rope, and adjust the pulley position so that it is directly above the optical plumb line. Adjust the direction of the optical plumb line so that the horizontal line of the line in the mirror is aligned with the scale line of the ruler. Rotate the focus knob so that the scale line of the ruler is clearly displayed in the eyepiece and read the value (see Figure 1). Keep the optical plumb line stationary, pull the rope to make the mobile radial deviation measuring instrument move upward in the vertical direction, stop at the vertical measuring point of each ring plate (see Figure 2), and read the readings of the mobile radial deviation measuring instrument scale of each ring plate one by one. After the measurement of each vertical measuring point on the first horizontal measuring station is completed, move the entire set of measuring equipment to the lower horizontal measuring station. According to the above steps, measure the radial deviation of all vertical measuring points on each horizontal measuring station one by one until all are completed: When internal measurement is required, fix the pulley on the support rod 1 and stand the support rod inside the tank with the top of the support rod against the wall, and measure according to (2) in 7.3.2.2. 7.3.2.3 Total station method
Stably install the instrument on the angle bracket at the bottom of the tank or the approximate geometric center of the floating plate, adjust the level, input the measurement point position parameters, and use the electronic angle measurement, distance measurement and automatic data processing functions of the total station to measure the diameter of each ring plate in real time, 85m horizontal mark is used as the measuring tape track, and debris that affects the measurement results on the measuring tape track is removed to ensure that the steel tape measure is close to the tank wall during measurement. The head of the steel tape measure is fixed with a magnetic base or other means, and the tape is placed along the tank wall so that the tape is close to the tank wall and roughly around the measuring tape track. It is fixed with a magnetic base for about 5 minutes to allow the tape and the tank to reach temperature equilibrium to eliminate the measurement error caused by the temperature difference between the tape and the tank wall. When the tank wall is made of other materials such as non-carbon steel, the tank wall temperature, material and linear expansion coefficient should be recorded.
(3) On the measuring tape track, 300mm away from the vertical weld or other obstacles, use a steel needle to draw a thin line perpendicular to the measuring tape track on the tank wall as the starting vertical line of the measuring tape. The cold scale line of the steel tape is overlapped with the starting vertical line, and the tape is fixed with a magnetic base or other methods. At a distance of no more than 3m from the magnetic base, use a clamp to clamp the tape and use a tensile gauge to apply the same tension to the tape as in the calibration state. At the same time, observe whether the zero scale of the tape and the vertical line at the starting point are displaced. If there is displacement, increase the magnetic base for several steps and re-measure. If there is no displacement, this point is used as the starting point of the circumference.
(4) From the starting point of the scale, along the circumference track at intervals of no more than 3m, use a clamp and a tensile force to apply the same tension to the tape along the line direction of the tank wall in turn. Use a magnetic base or other method to fix the tape until the starting point. The reading is estimated to be 0.5m. During the measurement process, the upper edge of the tape should always be aligned with the circumference track. At the end of each measurement process, check whether the zero scale line of the tape is displaced. If there is displacement, re-measure. (5) Break off the first starting point of the ruler and establish a new starting point at least 300 mm away. Perform the second measurement according to steps (3) and (4). The results of the two measurements should not be greater than the tolerance specified in Table 4: Table 4 Tolerance for circumference (centre) measurement
100m<centre≤200m
C>200m
(6) If the results of the two measurements exceed the specified tolerance, continue measuring until the results of two consecutive measurements meet the specified tolerance. The average of the two measurements is the circumference of the position. (7) Measure the positions of the circumference of each plate selected in (1) one by one to obtain the outer circumference length of each plate at 1/4 and the outer circumference centroid at 3/4.
7.3.2.2 Optical plumb line method
(1) Base circle measurement
J1G 162M5
Base circle measurement includes ruler method and inner ruler method. The outer ruler method is shown in 7.3.2.1. The base circle is 3/4 of the first plate. If this position cannot be measured, the 1/4 of the first plate can be selected as the base circle. When the optical method is used for external measurement, internal measurement can be carried out. The inner ruler method is used to measure the circumference of the base circle. The method is as follows: The ruler position of the inner ruler method is the same as that of the outer ruler method. Clear the tank wall obstacles within this position and draw the trajectory of the base circle. At a distance of more than 300mm from the vertical weld, use a steel tape to draw a thin line perpendicular to the circumference trajectory of the base circle as the starting vertical line. Align the zero scale line of the steel tape with the starting vertical line. The upper edge of the tape should be aligned with the lower edge of the horizontal line of the circumference trajectory. Place the tape against the tank wall and fix it with a magnetic base or other method. Use a steel ruler to press the tape in sequence to make it fit tightly against the tank wall. The length of each press is no more than 1m. Each time it is pressed, the end of the laid tape is fixed with a magnetic base or other method. During the laying process, if the tape moves, it should be laid again in front of the nearest magnetic base until the initial starting vertical line. After laying the tape to the initial starting point, read the tape reading corresponding to the starting vertical line and estimate it to 0.5mm: re-establish the starting point at a horizontal position 300mm above the starting vertical line and re-measure according to the above steps. The two measurement results should meet the requirements of 7.3.2.1, (5). The average value is taken as the inner circumference of the toilet. (2) When measuring the diameter of the plate at each circumference, an optical calibrator is used. If conditions permit, a guide rail optical radial deviation measuring instrument is also used. The measurement method of the guide rail optical radial deviation measuring instrument is shown in Appendix (, &) The establishment of horizontal measuring stations, according to the deformation of the tank body, determines the number of horizontal measuring stations, and the total number should be an even number. When the circumference is less than or equal to 100m, the arc length of adjacent horizontal measuring stations shall not exceed 3m, and the minimum number of measuring points shall not be less than 12 points; when the circumference is greater than 100m, the arc length of adjacent horizontal measuring stations shall not exceed 4m, and the minimum number of measuring points shall not be less than 36 points. The horizontal measuring stations should be evenly distributed along the circumference. The distance from any poly weld in the vertical direction shall not be less than 30 mm. They shall not be affected by obstacles. If affected, the horizontal measuring stations shall be adjusted appropriately. h) The vertical measuring base points shall be selected on the trajectory of the base circle and at 1/4 and 3/4 of the height of each ring plate respectively. d) The optical plumb line shall be calibrated before use. The calibration method is shown in Appendix A. d) Install the optical plumb line at the first horizontal measuring station, fix the pulley at the top of the tank, hang the mobile inter-diameter deviation measuring instrument with a rope, and adjust the pulley position so that it is directly above the optical plumb line. Adjust the direction of the optical plumb line so that the horizontal line of the line in the mirror is aligned with the scale line of the ruler. Rotate the focus knob so that the scale line of the ruler is clearly displayed in the eyepiece and read the value (see Figure 1). Keep the optical plumb line stationary, pull the rope to make the mobile radial deviation measuring instrument move upward in the vertical direction, stop at the vertical measuring point of each ring plate (see Figure 2), and read the readings of the mobile radial deviation measuring instrument scale of each ring plate one by one. After the measurement of each vertical measuring point on the first horizontal measuring station is completed, move the entire set of measuring equipment to the lower horizontal measuring station. According to the above steps, measure the radial deviation of all vertical measuring points on each horizontal measuring station one by one until all are completed: When internal measurement is required, fix the pulley on the support rod 1 and stand the support rod inside the tank with the top of the support rod against the wall, and measure according to (2) in 7.3.2.2. 7.3.2.3 Total station method
Stably install the instrument on the angle bracket at the bottom of the tank or the approximate geometric center of the floating plate, adjust the level, input the measurement point position parameters, and use the electronic angle measurement, distance measurement and automatic data processing functions of the total station to measure the diameter of each ring plate in real time, 85m horizontal mark is used as the measuring tape track, and debris that affects the measurement results on the measuring tape track is removed to ensure that the steel tape measure is close to the tank wall during measurement. The head of the steel tape measure is fixed with a magnetic base or other means, and the tape is placed along the tank wall so that the tape is close to the tank wall and roughly around the measuring tape track. It is fixed with a magnetic base for about 5 minutes to allow the tape and the tank to reach temperature equilibrium to eliminate the measurement error caused by the temperature difference between the tape and the tank wall. When the tank wall is made of other materials such as non-carbon steel, the tank wall temperature, material and linear expansion coefficient should be recorded.
(3) On the measuring tape track, 300mm away from the vertical weld or other obstacles, use a steel needle to draw a thin line perpendicular to the measuring tape track on the tank wall as the starting vertical line of the measuring tape. The cold scale line of the steel tape is overlapped with the starting vertical line, and the tape is fixed with a magnetic base or other methods. At a distance of no more than 3m from the magnetic base, use a clamp to clamp the tape and use a tensile gauge to apply the same tension to the tape as in the calibration state. At the same time, observe whether the zero scale of the tape and the vertical line at the starting point are displaced. If there is displacement, increase the magnetic base for several steps and re-measure. If there is no displacement, this point is used as the starting point of the circumference.
(4) From the starting point of the scale, along the circumference track at intervals of no more than 3m, use a clamp and a tensile force to apply the same tension to the tape along the line direction of the tank wall in turn. Use a magnetic base or other method to fix the tape until the starting point. The reading is estimated to be 0.5m. During the measurement process, the upper edge of the tape should always be aligned with the circumference track. At the end of each measurement process, check whether the zero scale line of the tape is displaced. If there is displacement, re-measure. (5) Break off the first starting point of the ruler and establish a new starting point at least 300 mm away. Perform the second measurement according to steps (3) and (4). The results of the two measurements should not be greater than the tolerance specified in Table 4: Table 4 Tolerance for circumference (centre) measurement
100m<centre≤200m
C>200m
(6) If the results of the two measurements exceed the specified tolerance, continue measuring until the results of two consecutive measurements meet the specified tolerance. The average of the two measurements is the circumference of the position. (7) Measure the positions of the circumference of each plate selected in (1) one by one to obtain the outer circumference length of each plate at 1/4 and the outer circumference centroid at 3/4.
7.3.2.2 Optical plumb line method
(1) Base circle measurement
J1G 162M5
Base circle measurement includes ruler method and inner ruler method. The outer ruler method is shown in 7.3.2.1. The base circle is 3/4 of the first plate. If this position cannot be measured, the 1/4 of the first plate can be selected as the base circle. When the optical method is used for external measurement, internal measurement can be carried out. The inner ruler method is used to measure the circumference of the base circle. The method is as follows: The ruler position of the inner ruler method is the same as that of the outer ruler method. Clear the tank wall obstacles within this position and draw the trajectory of the base circle. At a distance of more than 300mm from the vertical weld, use a steel tape to draw a thin line perpendicular to the circumference trajectory of the base circle as the starting vertical line. Align the zero scale line of the steel tape with the starting vertical line. The upper edge of the tape should be aligned with the lower edge of the horizontal line of the circumference trajectory. Place the tape against the tank wall and fix it with a magnetic base or other method. Use a steel ruler to press the tape in sequence to make it fit tightly against the tank wall. The length of each press is no more than 1m. Each time it is pressed, the end of the laid tape is fixed with a magnetic base or other method. During the laying process, if the tape moves, it should be laid again in front of the nearest magnetic base until the initial starting vertical line. After laying the tape to the initial starting point, read the tape reading corresponding to the starting vertical line and estimate it to 0.5mm: re-establish the starting point at a horizontal position 300mm above the starting vertical line and re-measure according to the above steps. The two measurement results should meet the requirements of 7.3.2.1, (5). The average value is taken as the inner circumference of the toilet. (2) When measuring the diameter of the plate at each circumference, an optical calibrator is used. If conditions permit, a guide rail optical radial deviation measuring instrument is also used. The measurement method of the guide rail optical radial deviation measuring instrument is shown in Appendix (, &) The establishment of horizontal measuring stations, according to the deformation of the tank body, determines the number of horizontal measuring stations, and the total number should be an even number. When the circumference is less than or equal to 100m, the arc length of adjacent horizontal measuring stations shall not exceed 3m, and the minimum number of measuring points shall not be less than 12 points; when the circumference is greater than 100m, the arc length of adjacent horizontal measuring stations shall not exceed 4m, and the minimum number of measuring points shall not be less than 36 points. The horizontal measuring stations should be evenly distributed along the circumference. The distance from any poly weld in the vertical direction shall not be less than 30 mm. They shall not be affected by obstacles. If affected, the horizontal measuring stations shall be adjusted appropriately. h) The vertical measuring base points shall be selected on the trajectory of the base circle and at 1/4 and 3/4 of the height of each ring plate respectively. d) The optical plumb line shall be calibrated before use. The calibration method is shown in Appendix A. d) Install the optical plumb line at the first horizontal measuring station, fix the pulley at the top of the tank, hang the mobile inter-diameter deviation measuring instrument with a rope, and adjust the pulley position so that it is directly above the optical plumb line. Adjust the direction of the optical plumb line so that the horizontal line of the line in the mirror is aligned with the scale line of the ruler. Rotate the focus knob so that the scale line of the ruler is clearly displayed in the eyepiece and read the value (see Figure 1). Keep the optical plumb line stationary, pull the rope to make the mobile radial deviation measuring instrument move upward in the vertical direction, stop at the vertical measuring point of each ring plate (see Figure 2), and read the readings of the mobile radial deviation measuring instrument scale of each ring plate one by one. After the measurement of each vertical measuring point on the first horizontal measuring station is completed, move the entire set of measuring equipment to the lower horizontal measuring station. According to the above steps, measure the radial deviation of all vertical measuring points on each horizontal measuring station one by one until all are completed: When internal measurement is required, fix the pulley on the support rod 1 and stand the support rod inside the tank with the top of the support rod against the wall, and measure according to (2) in 7.3.2.2. 7.3.2.3 Total station method
Stably install the instrument on the angle bracket at the bottom of the tank or the approximate geometric center of the floating plate, adjust the level, input the measurement point position parameters, and use the electronic angle measurement, distance measurement and automatic data processing functions of the total station to measure the diameter of each ring plate in real time, 85mm: Re-establish the starting point at a horizontal position 300mm above the
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