JJF 1009-2006 Capacity Measurement Terms and Definitions JJF1009-2006 standard download decompression password: www.bzxz.net
This specification is the commonly used terms and definitions of capacity measurement, including general terms of capacity measurement, capacity measurement methods, capacity measurement standards and capacity measurement instruments.

National Metrology Technical Specification of the People's Republic of China JJF1009--2006
Metrological Terms and Definitions for Capacity2006-12—08Promulgated
Implementation on 2007-03-08
Promulgated by the General Administration of Quality Supervision, Inspection and Quarantine JJF1009—2006
Metrological Terms and Definitions for CapacityJJF1009—2006
Replaces JJF1009—1987
This specification was approved by the General Administration of Quality Supervision, Inspection and Quarantine on December 8, 2006, and came into effect on March 8, 2007.
Responsible unit: National Technical Committee for Flow and Capacity Measurement Drafting unit: China Institute of Metrology Liaoning Institute of Metrology
Jiangsu Institute of Metrology and Testing Technology
Shenyang Energy Measurement Institute
This specification is interpreted by the National Technical Committee for Flow and Capacity Measurement Main drafters of this specification:
Liu Ziyong
Zhang Yili
Participating drafters:
Huang Zhaohui
Guo Ligong
Blood Snow Song
JJF 1009—2006
(China Institute of Metrology)
(Liaoning Institute of Metrology)
(China Institute of Metrology)
(Jiangsu Institute of Metrology and Testing Technology)
(China Institute of Metrology)
(China Institute of Metrology)
(Shenyang Energy Measurement Institute)
(Liaoning Institute of Metrology)
General terms for volumetric measurement-
2.1 Container
Capacity·
Capacity·
Basic measuring instrument
Measuring measuring instrument
Standard measuring instrument·
Nominal capacity…
Capacity tolerance·
Calibration medium
Residual amount
Outflow time
Waiting time
Tank wall temperature
2.15Liquid temperature
3Capacity measurement method·
3.1Weighing method
3.2Capacity comparison method
3.3Geometric measurement method·
4Capacity measurement standard
4.1Glass container standard device
4.2Weighing method Capacity standard device
Metal-based standard device
4.4 Land volume calibration device
5 Capacity measuring instruments
Glass measuring instruments...
5.2 Metal measuring instruments
5.3 Oil vending machine
Liquid material quantitative filling machine·
Liquefied petroleum gas tank truck
5.6 Oil tank truck,
JJF 1009—2006
Fuel dispenser
Working volume meter
Level gauge
Vertical metal tank radial deviation measuring instrument
Static pressure method oil tank gauge device
Vertical metal tank
Horizontal metal tank
Spherical metal tank
Railway tank car
5.17 Liquid cargo measuring tank
Appendix A
Chinese index
English index
Appendix B
JJF1009—2006
1 Scope
JJF 1009—2006
Terms and definitions of volumetric measurement
This specification provides terms and definitions for volumetric measurement, including general terms of volumetric measurement, volumetric measurement methods, volumetric measurement standards and volumetric salt measuring instruments. ? General terms for volumetric measurement
2.1 Container
An apparatus that can hold substances (liquids, gases or solid particles). 2.2 Capacity
The amount of substances (volume or mass) that can be held in a container under certain conditions. 2.3 Volume
The volume of space that can hold substances in a container. 2.4 Measuring container A container with a certain volume that can be used as a measuring instrument. 2.5 Measuring container (10contain) A measuring instrument used to measure the volume of liquid poured into a measuring instrument (with dry inner wall). 2.6 Measuring container (to deliver) A measuring instrument used to measure the volume of liquid discharged from a measuring instrument. 2.7 Standard measuring container A measuring instrument that meets certain requirements and can be used as a national standard for the transfer of capacity values. Standard measuring instruments are divided into standard glass measuring instruments and standard metal measuring instruments.
2.8Nominal capacityThe capacity value marked on the measuring instrument according to the capacity of the measuring instrument. 2.9Capacity tolerancecapacitypermissibleerrorThe maximum permissible error of capacity specified for measuring instruments of different grades. 2.10Calibration liquidThe liquid used for calibration of measuring instruments.
2.11Residual liquidThe amount of liquid remaining on the inner wall of the measuring instrument after the liquid inside the measuring instrument is discharged within the specified time. 2.12Discharging timeThe time specified for all liquid in the measuring instrument to flow out in order to ensure the measurement accuracy of the measuring instrument. 2.13Waiting timewaiting time
The time specified for the residual liquid on the inner wall of the measuring instrument to fully flow out. 2.14Tank shelltemperatureThe average temperature of the wall of the measuring instrument.
2.15Liquid temperatureThe average temperature of the condensate in the measuring instrument.
2.16 Measuring tank
JJF1009—2006
Metal or non-metal tanks with structures that meet certain requirements and have a large volume, which can be used as containers for trade transfer. Examples: vertical metal tanks, horizontal metal tanks, spherical metal tanks, ship liquid cargo measuring tanks, railway tank cars, etc. 2.16.1 Dip hatch
An opening on the top of the tank for sampling, measuring the liquid level and liquid temperature in the tank. 2.16.2 Dip plate
Located directly below the metering hatch, it is a horizontal metal plate that supports the dipstick hammer when measuring the liquid level, and is the positioning plate for the lower metering datum mark.
2.16.3 Upper datum markThe intersection of the vertical line of the lower scale slot in the main metering hatch and the upper plane. 2.16.4 The intersection of the vertical line through the upper measurement reference point and the plane on the metering plate. 2.16.5 Reference height The vertical distance between the upper measurement reference point and the lower measurement reference point. 2.16.6 Smallest measurable volume The smallest measurable volume The minimum volume of liquid discharged or injected during the receiving and sending operations in order to ensure that the tank capacity reaches the specified uncertainty.
2.16.7 Liquid level height
The vertical distance from the lower reference point to the free liquid surface, 2.16.8 Ullage height
The vertical distance from the upper reference point to the free liquid surface. 2.16.9 Ancillary volume The volume occupied by accessories that affect the tank volume. When its volume increases the effective capacity, it is called positive volume; when its volume reduces the effective capacity of the tank, it is called negative volume. 2.16.10 Head
The parts at both ends of the straight cylinder of a horizontal metal tank or a railway tank car. According to the structural form, it can be divided into arc top, ellipsoid top, etc. 2.16.11 Inside vartical diameter inside vartical diameter The diameter of the horizontal metal tank or the medulla of a railway tank car in the vertical direction. 2.16.12 Inside cross diameter inside cross diameter The diameter of the horizontal metal tank or the tank of a railway tank car in the horizontal direction. 2.16.13 Total inside length The distance between the centers of the two heads of a horizontal metal tank or a railway tank car. 2.16.14 outside vertical diameter outside vcrtical diameter horizontal metal tank or railway tank car including the diameter of the tank in the vertical direction of the upper and lower plates of the cylinder. 2.16.15 outside cross diameter outside cross diameter horizontal metal tank or railway tank car including the diameter of the tank in the horizontal direction of the upper plate of the cylinder. 2
2.16.16 total outside length total outside length JJF1009—2006
the distance between the centers of the two heads of a horizontal metal tank or railway tank car including the thickness of the heads. 2.16.17 manhole manhale
the opening for personnel to enter and exit the tank for maintenance work. 2.16.18 calibration table calibration table the corresponding relationship between the height and capacity of the measuring vessel. 2.16.19 hydrostatic correction table hydrostatic correction table the corresponding relationship between the height and increase of the liquid level under the action of the hydrostatic pressure.
Ratio between the volume of a part of the substance contained and the total volume Capacity measurement method
Capacity measurement method includes: weighing method
ghayg method
weighing methodwe
capacitance
method for measuring the particle of the test medium contained in the measuring device, by the formula
where: V2o
/calculation:
cross method
density and temperature
calculate
volume at the main standard temperature
M(pnpsl1+β(20 -t))
Product value:
Mass of specified medium,
Density of standard material,
Stainless steel ph=7.85glcm
Steel Pu=8.4g/er
Gas density gau
In Jinjing Laboratory
The volume expansion coefficient of the tested material at ℃
1Cr18N9T
3=50X10
The test medium is in the opening METROLOCT
Carbon steel
3.2 Volumetric comparison method volumetriccomparisonmethodUBLISHING HOUSE
Use a higher-level standard measuring instrument to directly compare the measured measuring instrument with the testing medium, and calculate its volume at standard temperature after temperature correction. Calculated by formula (2): V2 = V, [1 + B (t-20) + β2 (20-t2) + Bu (tz-t)) the volume value of the measured volume at 20 ℃, L; where: V20 || tt || V - the volume value of the standard volume at 20 ℃, L; B, - the volume expansion coefficient of the standard volume. ℃-1; β2 - the volume expansion coefficient of the measured volume, ℃-1; (2) || tt || JJF 10092006 || tt || - the average volume expansion coefficient of the calibration medium in the range of t, ~ z t - the average temperature of the calibration medium in the standard volume, C; t2 - the average temperature of the calibration medium in the measured volume, t. 3.2.1 Filling volume comparison method filling volumetric method The method of injecting the calibration medium from a higher level standard volume into the measured volume. 3.2.2 Delivering volumetric method: A method of discharging the calibration medium from the measured instrument into a higher level scalar instrument. 3.3 Geometric method: A method of calculating the volume by measuring the relevant geometric dimensions of the instrument. Usually there are external measurement method and internal measurement method. 4 Volume measurement standard
4.1 Standard equipment for glass measuring instruments standardglasswareequipment: A device consisting of a standard glass measuring instrument group, a thermometer, a stopwatch, etc. 4.2 Standard equipment for weighing method: A device generally consisting of a balance, a standard code, a thermometer, an air density measuring instrument, a water circulation system, etc. 4.3 Standard equipment for metal measuring instruments standardequipmentformalliccontainer: A device consisting of a standard metal measuring instrument group, a thermometer, a stopwatch, a water circulation system, etc. 4.4 Calibration equipment for volumetric tank A device consisting of measuring instruments such as steel tape measure, depth measuring tape measure, casing ruler, plumb line, theodolite, level, thickness gauge, total station, etc.
5 Volumetric measuring instruments
5.1 Glassware
Measuring instruments made of glass.
Sl1 Standard glass container Standard glass container Glassware manufactured according to the specified structure and can be used as a volumetric value transmission. 5.1.2 Common glass measuring instruments Working glass container Commonly used glass measuring instruments in work include burettes, graduated pipettes, single-line pipettes, single-line volumetric flasks, measuring cylinders, measuring cups, etc.
5.1.2.1 Burette
A slender tube with randomly engraved graduation lines and a pan-type glass measuring instrument with a certain nominal value. 5.1.2.2 Graduated pipette A glass measuring vessel with multiple graduated lines, used to draw a certain amount of liquid. 5.1.2.3 Pipette (one mark) in glass A glass measuring vessel with a single graduated line, used to draw a certain amount of liquid. 5.1.2.4 Volumetric flasks (one mark) in glass A glass measuring vessel with a single graduated line on the neck and a pear-shaped bottom. 5.1.2.5 Glass graduated glass round glass vessel with a wide base and graduated lines. 5.1.2.6 Conical graduated glass vessel with graduated lines and a conical glass cover.
5.1.3 Special glassware Special glassware is a glass measuring instrument specially designed and manufactured in terms of structure and shape according to the purpose, including seawater dissolved oxygen burette, micro pipette, Ostrich pipette, colorimetric tube, centrifuge tube, graduated test tube, blood sugar tube and digestion tube, etc. 5.1.3.1 Seawater dissolved oxygen burette is a piston-free automatic zeroing burette composed of a glass tube, a side tube, a buffer and a liquid flow nozzle. 5.1.3.2 Micro pipettes is made of capillary glass tube with milky white backing, and is used for measuring blood. 5.1.3.3 Osiwald pipettes Osiwald glass tubes have a straight capillary tube at the top, an olive-shaped ball in the middle, and a conical tip at the bottom. They are used for quantitative blood collection. 5.1.3.4 Colorimetric tubes
Made of flat bottom and slender glass tubes, they are generally used for half-volume and full-volume graduations. 5.1.3.5 Graduated centrifuge tubes Centrifuge tubes have a pointed or round bottom and are used for chemical analysis. 5.1.3.6 Graduated test tubes Graduated test tubes are round-bottomed glass tubes with or without stoppers. They are used for chemical analysis. 5.1.3.7 Blood sugar tubes are used for analyzing the blood sugar content in human blood. 5.1.3.8 Blood digestion tubes are measuring instruments used for chemical analysis. 5.1.4 Medical syringes Injector
It is composed of a jacket, a core and a cone, and the jacket surface has a volume indicator. 5.1.5 Quantitative adjustable pipet It is composed of a positioning component, a volume adjustment indicator, a piston sleeve and a liquid suction nozzle, etc. It is a measuring instrument used for sampling and adding liquid in chemical analysis.
5.2 Metallic container Metallic container is a measuring instrument made of metal (stainless steel, carbon steel, etc.). 5.2.1 Standard metallic container Standard metallic container is manufactured according to the specified structure and can be used as a metallic measuring instrument for transferring volume value. 5.2.1.1 Standard metallic conitainer with three-way valve Standard metallic conitainer with three-way valve A standard metallic conitainer with a three-way valve installed at the bottom to prevent gas from being depleted in the standard metallic conitainer during normal filling. Generally used for standard push metallic conitainers. 5.2.1.2 Standard metallic container with pipette A metallic conitainer with a liquid pipe installed inside the metallic conitainer to prevent splashing and bubbles during liquid filling. Generally used for measuring oil products.
JJF1009—2006
Standard metallic container with liquid level compensation-5.2.1.3
A metallic conitainer with three liquid level reading devices at 120° to each other, without the need for a level gauge to adjust the liquid level. Generally used for vehicle-mounted metallic conitainers.
5.2.1.4 Standard metallic container which can fill liquid or gas with gas and an exhaust valve and a liquid filling valve are installed on the overflow cover of the metallic container, and a lower measuring neck is installed at the bottom of the metallic container. It can be used for the calibration of gas bell jars. ENSR
5.2.1.5 Internal standard metallic container standardmetalm5.2.2 Measuring neck measuring neek S The reading part of the round body of the neck of the standard metallic container5.2.3 Overflow cover overflo
Installed on the measuring neck to prevent the calibration medium from leaking
5.2.4 Measuring neck mark
Besuring Metal measuring instruments such as overflowing neck, overflowing neck, inner scale, etc., with a funnel-shaped scale placed on the measuring neck for reading the liquid level. 5.2.5 Volume of smallest scale division of the measuring neck. 5.2.6 Reading range: The volume value corresponding to the two smallest scale marks on the main scale is generally better than 0.1 ml. 5.2.7 Level cursor: The volume value corresponding to the two adjacent smallest scale marks on the main scale is generally better than 0.1 ml. Ermier cursor: A glass tube with a sliding and locking function.
Displays liquid level height
5.2.8 Liquid guide tube gidaripe
Installed with the upper liquid inlet in a metal measuring instrument to prevent splashing and gas
5.2.9 Exhaust port ven
The outlet for discharging gas inside the measuring instrument after liquid is injected into the measuring instrument
5.2.10 Drain valve deliver
A sub-marker for receiving liquid level height
The resolution of its readings is limited
UBLISHR
Valve for discharging liquid from a measuring instrument
5.3 Oil dispenser rlaplameCN
METROLOG
Meter used for retail of edible vegetable oil
5.4 Quantitative filling machine for liquid materials quantitativefillingmachine Measuring instrument used for quantitative filling in chemical, pharmaceutical and food industries. 5.5 liquefied petroleum gas vehicle tank volume Special container for road transport of liquefied gas. 5.6 road tankers
Road tankers used for road transport of liquids and measurement. 5.7 tanks and barrels
Instruments for containing, transporting and measuring liquids. 6
5.8 fuel dispensers
JJF1009—2006
Liquid volume measurement system for filling fuel vehicles with fuel. 5.9 working measuring container has a certain volume and is used as a measuring instrument at work. 5.10 level gauge
Instrument used to measure the height of the liquid level in the measuring tank. 5.11 Vertical metal tank diametrical deviation measuring instrument used to measure the vertical metal tank GNIST
strument
5.12 Hydrostatic tank gauge device composed of pressure transmitter, etc., used to measure the quality of oil products (commercial quality) in the oil tank.
5.13 Vertical metal tank
Tical metal lid
Vertically installed cylindrical metal tank.
5.13.1 Base circle
The circumference is called the base circle for calculating the circumference or diameter of other plates. 5.13.2 Radial difference The radius of a certain circle of a vertical metal tank is compared with the base circle 5.13.3 Horizontal pos The circle on which the radial position determined along the circumference of the tank is compared with other circumferences as the base position for radial deviation measure 5.13.4 Vertical point positionfdr Veruicalmeasure Corresponding to the horizontal machine, it is fixed on the tank wall and the water window formed by the liquid in the attachment of the tank bottom seam is determined in the direction of the measuring piece. 5.13.6 Lap height
When measuring the level, the height formed by the horizontal rotation of the sighting axis of the level or the overlapping height of two plates at the welding point of two adjacent ring plates. METROLOGY
5.13.7External height of plateExternal height of plateThe height of the outer surface of the ring plate.
5.13.8Internal height of plateThe height of the inner surface of the ring plate.
5.13.9Bottom volume
The capacity below the horizontal plane of the highest point of the tank bottom plate. 5.13.10Dead stock
The capacity below the horizontal plane of the measurement reference point. 5.13.11Elevation
The height from a certain point to the reference horizontal plane measured by the level and the elevation ruler is called the elevation. 74 Measuring neck scale Metal measuring instruments such as funnel-shaped scales placed on the measuring neck for reading the liquid level 5.2.5 Volume of smallest scale division Measuring neck scale 5.2.6 Reading range The volume value corresponding to the two adjacent smallest scales on the main scale is generally better than 0.1 ml 5.2.7 Liquid level cursor The volume value corresponding to the two adjacent smallest scales is a smooth and air-tight glass tube with locking function.
Displays liquid level height
5.2.8 Liquid guide tube gidaripe
Installed with the upper liquid inlet in a metal measuring instrument to prevent splashing and gas
5.2.9 Exhaust port ven
The outlet for discharging gas inside the measuring instrument after liquid is injected into the measuring instrument
5.2.10 Drain valve deliver
A sub-marker for receiving liquid level height
The resolution of its readings is limited
UBLISHR
Valve for discharging liquid from a measuring instrument
5.3 Oil dispenser rlaplameCN
METROLOG
Meter used for retail of edible vegetable oil
5.4 Quantitative filling machine for liquid materials quantitativefillingmachine Measuring instrument used for quantitative filling in chemical, pharmaceutical and food industries. 5.5 liquefied petroleum gas vehicle tank volume Special container for road transport of liquefied gas. 5.6 road tankers
Road tankers used for road transport of liquids and measurement. 5.7 tanks and barrels
Instruments for containing, transporting and measuring liquids. 6
5.8 fuel dispensers
JJF1009—2006
Liquid volume measurement system for filling fuel vehicles with fuel. 5.9 working measuring container has a certain volume and is used as a measuring instrument at work. 5.10 level gauge
Instrument used to measure the height of the liquid level in the measuring tank. 5.11 Vertical metal tank diametrical deviation measuring instrument used to measure the vertical metal tank GNIST
strument
5.12 Hydrostatic tank gauge device composed of pressure transmitter, etc., used to measure the quality of oil products (commercial quality) in the oil tank.
5.13 Vertical metal tank
Tical metal lid
Vertically installed cylindrical metal tank.
5.13.1 Base circle
The circumference is called the base circle for calculating the circumference or diameter of other plates. 5.13.2 Radial difference The radius of a certain circle of a vertical metal tank is compared with the base circle 5.13.3 Horizontal pos The circle on which the radial position determined along the circumference of the tank is compared with other circumferences as the base position for radial deviation measure 5.13.4 Vertical point positionfdr Veruicalmeasure Corresponding to the horizontal machine, it is fixed on the tank wall and the water window formed by the liquid in the attachment of the tank bottom seam is determined in the direction of the measuring piece. 5.13.6 Lap height
When measuring the level, the height formed by the horizontal rotation of the sighting axis of the level or the overlapping height of two plates at the welding point of two adjacent ring plates. METROLOGY
5.13.7External height of plateExternal height of plateThe height of the outer surface of the ring plate.
5.13.8Internal height of plateThe height of the inner surface of the ring plate.
5.13.9Bottom volume
The capacity below the horizontal plane of the highest point of the tank bottom plate. 5.13.10Dead stock
The capacity below the horizontal plane of the measurement reference point. 5.13.11Elevation
The height from a certain point to the reference horizontal plane measured by the level and the elevation ruler is called the elevation. 74 Measuring neck scale Metal measuring instruments such as funnel-shaped scales placed on the measuring neck for reading the liquid level 5.2.5 Volume of smallest scale division Measuring neck scale 5.2.6 Reading range The volume value corresponding to the two adjacent smallest scales on the main scale is generally better than 0.1 ml 5.2.7 Liquid level cursor The volume value corresponding to the two adjacent smallest scales is a smooth and air-tight glass tube with locking function. bzxZ.net
Displays liquid level height
5.2.8 Liquid guide tube gidaripe
Installed with the upper liquid inlet in a metal measuring instrument to prevent splashing and gas
5.2.9 Exhaust port ven
The outlet for discharging gas inside the measuring instrument after liquid is injected into the measuring instrument
5.2.10 Drain valve deliver
A sub-marker for receiving liquid level height
The resolution of its readings is limited
UBLISHR
Valve for discharging liquid from a measuring instrument
5.3 Oil dispenser rlaplameCN
METROLOG
Meter used for retail of edible vegetable oil
5.4 Quantitative filling machine for liquid materials quantitativefillingmachine Measuring instrument used for quantitative filling in chemical, pharmaceutical and food industries. 5.5 liquefied petroleum gas vehicle tank volume Special container for road transport of liquefied gas. 5.6 road tankers
Road tankers used for road transport of liquids and measurement. 5.7 tanks and barrels
Instruments for containing, transporting and measuring liquids. 6
5.8 fuel dispensers
JJF1009—2006
Liquid volume measurement system for filling fuel vehicles with fuel. 5.9 working measuring container has a certain volume and is used as a measuring instrument at work. 5.10 level gauge
Instrument used to measure the height of the liquid level in the measuring tank. 5.11 Vertical metal tank diametrical deviation measuring instrument used to measure the vertical metal tank GNIST
strument
5.12 Hydrostatic tank gauge device composed of pressure transmitter, etc., used to measure the quality of oil products (commercial quality) in the oil tank.
5.13 Vertical metal tank
Tical metal lid
Vertically installed cylindrical metal tank.
5.13.1 Base circle
The circumference is called the base circle for calculating the circumference or diameter of other plates. 5.13.2 Radial difference The radius of a certain circle of a vertical metal tank is compared with the base circle 5.13.3 Horizontal pos The circle on which the radial position determined along the circumference of the tank is compared with other circumferences as the base position for radial deviation measure 5.13.4 Vertical point positionfdr Veruicalmeasure Corresponding to the horizontal machine, it is fixed on the tank wall and the water window formed by the liquid in the attachment of the tank bottom seam is determined in the direction of the measuring piece. 5.13.6 Lap height
When measuring the level, the height formed by the horizontal rotation of the sighting axis of the level or the overlapping height of two plates at the welding point of two adjacent ring plates. METROLOGY
5.13.7External height of plateExternal height of plateThe height of the outer surface of the ring plate.
5.13.8Internal height of plateThe height of the inner surface of the ring plate.
5.13.9Bottom volume
The capacity below the horizontal plane of the highest point of the tank bottom plate. 5.13.10Dead stock
The capacity below the horizontal plane of the measurement reference point. 5.13.11Elevation
The height from a certain point to the reference horizontal plane measured by the level and the elevation ruler is called the elevation. 71Base circlecircle
is the basis for calculating the circumference or diameter of other plates:
, and this circle is called the base circle. 5.13.2 Radial difference The radius of a certain circle of a vertical metal tank is compared with the base circle 5.13.3 Horizontal pos The circle on which the radial position determined along the circumference of the tank is compared with other circumferences as the base position for radial deviation measure 5.13.4 Vertical point positionfdr Veruicalmeasure Corresponding to the horizontal machine, it is fixed on the tank wall and the water window formed by the liquid in the attachment of the tank bottom seam is determined in the direction of the measuring piece. 5.13.6 Lap height
When measuring the level, the height formed by the horizontal rotation of the sighting axis of the level or the overlapping height of two plates at the welding point of two adjacent ring plates. METROLOGY
5.13.7External height of plateExternal height of plateThe height of the outer surface of the ring plate.
5.13.8Internal height of plateThe height of the inner surface of the ring plate.
5.13.9Bottom volume
The capacity below the horizontal plane of the highest point of the tank bottom plate. 5.13.10Dead stock
The capacity below the horizontal plane of the measurement reference point. 5.13.11Elevation
The height from a certain point to the reference horizontal plane measured by the level and the elevation ruler is called the elevation. 71Base circlecircle
is the basis for calculating the circumference or diameter of other plates:
, and this circle is called the base circle. 5.13.2 Radial difference The radius of a certain circle of a vertical metal tank is compared with the base circle 5.13.3 Horizontal pos The circle on which the radial position determined along the circumference of the tank is compared with other circumferences as the base position for radial deviation measure 5.13.4 Vertical point positionfdr Veruicalmeasure Corresponding to the horizontal machine, it is fixed on the tank wall and the water window formed by the liquid in the attachment of the tank bottom seam is determined in the direction of the measuring piece. 5.13.6 Lap height
When measuring the level, the height formed by the horizontal rotation of the sighting axis of the level or the overlapping height of two plates at the welding point of two adjacent ring plates. METROLOGY
5.13.7External height of plateExternal height of plateThe height of the outer surface of the ring plate.
5.13.8Internal height of plateThe height of the inner surface of the ring plate.
5.13.9Bottom volume
The capacity below the horizontal plane of the highest point of the tank bottom plate. 5.13.10Dead stock
The capacity below the horizontal plane of the measurement reference point. 5.13.11Elevation
The height from a certain point to the reference horizontal plane measured by the level and the elevation ruler is called the elevation. 7
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