CN102128578B - Method for measuring elevation of bottom of tank with liquid and method for measuring volume of bottom of tank with liquid - Google Patents
Method for measuring elevation of bottom of tank with liquid and method for measuring volume of bottom of tank with liquid Download PDFInfo
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- CN102128578B CN102128578B CN2010100340414A CN201010034041A CN102128578B CN 102128578 B CN102128578 B CN 102128578B CN 2010100340414 A CN2010100340414 A CN 2010100340414A CN 201010034041 A CN201010034041 A CN 201010034041A CN 102128578 B CN102128578 B CN 102128578B
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Abstract
The invention discloses a method for measuring the elevation of the bottom of a tank with liquid, which is used for an external floating roof vertical metal tank. The metal tank comprises a floating roof and a plurality of floating roof upright posts, wherein the floating roof upright posts pass through the floating roof and are supported by the bottom of the metal tank. The method comprises: determining a level plane; and measuring the distance from the top ends of the floating roof upright posts to the level plane with a tank bottom elevation ruler to obtain the measured values of the elevations of the bottom of the tank at the positions of all floating roof upright posts. The invention also discloses a method for measuring the volume of the bottom of the tank with liquid, which is used for the external floating roof vertical metal tank. The method comprises: measuring the elevation of the edge part of the bottom of the tank, and measuring the elevation of the bottom of the tank according to the method for measuring the elevation of the bottom of the tank with liquid; and obtaining the measured value of the elevation of the edge part of the bottom of the tank the measured value of the elevation of the bottom of the tank according to the measurement of the elevation of the edge part of the bottom of the tank and the measurement of the elevation of the bottom of the tank, and calculating the volume of the bottom of the tank. The method for measuring the elevation of the bottom of the tank with liquid and the method for measuring the volume of the bottom of the tank with liquid make operation simpler and more convenient and are safer and more reliable.
Description
Technical field
The present invention relates to the calibrating field of large-scale metal can, more particularly, relate at the bottom of a kind of band flow container that is used for the outer floating roof metal can capacity calibration method at the bottom of the level measurement method and band flow container.
Background technology
Vertical metal tank is the main measurement instrument of international petrochemicals trade settlement, also is the trade settlement of domestic petroleum, liquid petroleum product and other liquid goods, the important measurement instrument and the storage facilities of transmitting-receiving handing-over.Vertical metal tank behind assay approval can be used for trade settlement, transmitting-receiving handing-over as measurement instrument.Thereby in petrochemical industry, the calibration operation of vertical metal tank is extremely important.
The outer floating roof metal can is a kind of in the vertical metal tank.According to the requirement of national metrological verification regulations JJG168-2005, the vertical metal tank calibration interval are: calibrating first generally is no more than 2 years, and follow-up calibrating generally is no more than 4 years.If behind the tank body generation gross distortion, overhaul or verification result when falling under suspicion, must examine and determine according to the requirement of calibrating first.
But the calibrating of externally floating top vertical metal tank need be carried out under the condition that the liquid in the metal can is emptied fully usually, that is to say that the metal can that is in the calibrating state must be stopped using.Because the outer floating roof metal can belongs to large-scale test tank, not only empties human and material resources and financial resources that process need costs a lot of money, and stopping using of metal can also has a strong impact on the ordinary production operation of enterprise.Therefore, need a kind of solution that can realize, promptly need not empty the technical scheme that the outer floating roof metal can just can be examined and determine this outer floating roof metal can with liquid calibrating outer floating roof metal can.
CN1664498A provides a kind of outer floating roof metal can band liquid-in metrological verification method; This metal can band liquid-in metrological verification method comprises the many aspects to metal can calibrating, as to the plate hight of basic circle circumference, girth sheets, thickness of slab, circle tank body degree of tilt, jar bottom side portion absolute altitude, jar end absolute altitude, jar in the measurement of annex etc.
In the factor that influences the metal can volumetric metering, the influence degree of jar end capacity is bigger.This be because: accommodate at metal can under the situation of oil product or liquid, oil product that holds in the metal can or liquid can add bigger pressure to the jar bottom application.And under the effect of this pressure, distortion might appear in the ground that supports jar end, compares slightly sedimentation when promptly just having built up with metal can.For the metal can that is structured in the soft relatively area of soil property, the distortion of ground is particularly evident.Therefore, rough phenomenon occurs at the bottom of can causing the metal can jar, capacity changes at the bottom of making jar.
Because the variation of jar end capacity is bigger for the metering influence of metal can, therefore the calibrating to capacity at the bottom of the jar seems particularly important.
Be used for outer floating roof metal can band liquid-in metrological verification method what CN1664498A provided, the calibrating at the jar end of externally floating top vertical metal tank comprises:
Jar bottom side portion level measurement: evenly arrange some measurement points around a girth sheets circumference in the tank body outside.At first set up the 1st measurement point at corresponding with tank deck measurement platform jar at the end, other measurement points by counterclockwise be labeled as the 2nd, 3 successively ..., the N measurement point.Utilize spirit-leveling instrument and absolute altitude chi; Set up a plurality of correlation measurement points all measurement points are carried out level measurement; At last the absolute altitude of all measurement points is converted to the absolute altitude on the corresponding level of the 1st measurement point, on the measurement surface level in the measurement of correlation that utilizes upper and lower target is converted to limit standard laid down by the ministries or commissions of the Central Government height jar during the level measurement of jar end; And
Jar end level measurement: when floating top rise fully float after; Around tank skin, set up 3-4 measurement point; With the spirit-leveling instrument frame in measurement point and leveling; To float the top column with gin wheel and extract one by one, then the absolute altitude chi will be provided with the hole of each root support leg through floating in the top respectively, thereby measure the jar end absolute altitude of each measurement point.
Wherein, in the measuring process of absolute altitude, need to float the top column and extract one by one at the bottom of to jar, in withdrawal process, be easy to, thereby bring bigger danger to examining and determine operation because friction produces spark.And floating top column that will be heavier on floating top is extracted one by one, and this complicated operating process, labour intensity are very big and consuming time longer.
Thereby, level measurement method and jar end capacity calibration method at the bottom of a kind of band flow container that is used for the outer floating roof metal can that can be easy and simple to handle and safe and reliable of needs.
Summary of the invention
The objective of the invention is to overcome in the jar end level measurement method of existing outer floating roof metal can complicated operation and have dangerous defective, and level measurement method at the bottom of a kind of easy and simple to handle and safe and reliable band flow container is provided.
According to an aspect of the present invention; Level measurement method at the bottom of a kind of band flow container is provided; The level measurement method is used for the outer floating roof metal can at the bottom of this band flow container; This outer floating roof metal can comprises floating top and a plurality of floating tops column, and this a plurality of floating tops column passes said floating top and by supporting at the jar end of said outer floating roof metal can, the level measurement method comprises the steps: at the bottom of the said band flow container
Confirm the level plane;
Utilize a jar end absolute altitude chi to measure the top of said floating top column and the distance between the said level plane, thereby obtain the jar end level measurement value at each place, column position, floating top.
According to a further aspect in the invention; Capacity calibration method at the bottom of a kind of band flow container also is provided; The capacity calibration method is used for the outer floating roof metal can at the bottom of this band flow container; The capacity calibration method comprises at the bottom of the said band flow container: a jar bottom side portion level measurement and a jar end level measurement; Calculate the capacity at jar end according to said jar bottom side portion level measurement and jar jar bottom side portion level measurement value that end level measurement obtains and a jar end level measurement value, wherein, the end level measurement of said jar according to above-mentioned band flow container at the bottom of the level measurement method carry out.
Capacity calibration method at the bottom of the band flow container of level measurement method according to level measurement method at the bottom of the band flow container that is used for the outer floating roof metal can provided by the present invention and at the bottom of comprising this band flow container; At the bottom of carrying out according to the present invention jar in the level measurement; Do not need to float the top column and release one by one, but directly measure the top of each floating top column and the distance between the level plane.Therefore, can obtain each floating top column, thereby obtain jar end level measurement value in the position of each floating top column in the position of each floating top column and the distance between the level plane.
Obviously, at the bottom of the band flow container that is used for the outer floating roof metal can provided by the present invention at the bottom of level measurement method and the band flow container operation of capacity calibration method more easy and more safe and reliable.
Description of drawings
Fig. 1 for utilize according to level measurement method at the bottom of the band flow container of the present invention to jar at the bottom of the synoptic diagram measured of absolute altitude, also represented at the bottom of the band flow container of the present invention in the capacity calibration method measurement to jar bottom side portion absolute altitude;
Fig. 2 is according in the of the present invention jar of end level measurement method, measures jar synoptic diagram of end level measurement value in the position of a floating top column;
Fig. 3 is according in the capacity calibrating at the bottom of the band flow container of the present invention, the synoptic diagram of the selection measurement point of band flow container bottom side portion level measurement method;
Fig. 4 is according in the capacity calibrating at the bottom of the band flow container of the present invention, the synoptic diagram of the jar bottom side portion level measurement value of measuring at a measurement point in the band flow container bottom side portion level measurement method; With
Fig. 5 is according to selected jar of end measurement point distribution schematic diagram of geometric measurement method.
Embodiment
Describe in detail with reference to the accompanying drawing specific embodiments of the invention below.
Level measurement method at the bottom of a kind of band flow container provided by the present invention; The level measurement method is used for outer floating roof metal can 1 at the bottom of this band flow container; This outer floating roof metal can 1 comprises floating top 2 and a plurality of floating tops column 7; This a plurality of floating tops column 7 passes said floating top 2 and by supporting at the jar end of said outer floating roof metal can 1, the level measurement method comprises the steps: at the bottom of the said band flow container
Confirm a level planar S (as utilizing spirit-leveling instrument);
Utilize jar end absolute altitude chi 8 to measure the top of said floating top column 7 and the distance between the said level planar S, thereby obtain the jar end level measurement value at each place, column 7 positions, floating top.
Traditional to jar at the bottom of in the level measurement method (disclosed jar of end level measurement method in like CN1664498A); Need floating top 2 rise fully floating after; Each support leg 7 is extracted out; Then the absolute altitude chi is inserted floating the top on 2 and originally be installed with in the hole of support leg 7, contact with a jar end 9 up to the bottom of absolute altitude chi, thus the absolute altitude parameter at the acquisition jar end.This traditional jar existing problem of end level measurement method is: owing to be the calibrating of band liquid, therefore in the time will floating 7 extractions of top column, be easy to because collision produces spark accidents caused; And, need extract out one by one a plurality of floating tops column 7, operation is inconvenience very, and efficient is lower.
And in level measurement method at the bottom of the band flow container provided by the present invention, do not need to float top column 7 to release one by one, but directly measure the top of floating top column 7 and the distance between the level planar S.Therefore; For each floating top column 7; The top that can obtain each floating top column 7 is in the position of each floating top column 7 and the distance between the level planar S, and then obtains the jar end level measurement value of jar end in the position of each floating top column 7, with the capacity at the bottom of being used to calculate jar.
Preferably, in order to obtain a jar end level measurement value more exactly, the longitudinal direction (being length direction) of said floating top column 7 is perpendicular with said level planar S.
Because the level planar S is positioned at the top on floating top 2, therefore, under the band liquid status, the top of floating top column 2 is positioned under the level planar S.Position at each floating top column 7 places utilizes jar end absolute altitude chi 8 to measure the top of each floating top column 7, detects the top of each floating top column 7 and the distance between the level planar S, thereby obtains the jar end level measurement value at each place, column 7 positions, floating top.For some floating tops column 7, the jar end level measurement value at place, this column 7 positions, floating top is top and the distance between the level planar S of this floating top column 7 and the length sum of this floating top column 7.
Usually; Floating top column 7 is in the vertical state basically; The length direction of promptly floating top column 7 is parallel to the direction of the central axis of said outer floating roof metal can 1, thereby can be reflected in jar end absolute altitude value at this place, column 7 positions, floating top exactly to the measurement of distance between the top of floating top column 7 and the level planar S.And even floating top column 7 favours the central axial direction of metal can 1 a little, because floating top column 7 receives the position-limiting action on floating top 2, thereby the inclined degree of floating top column 7 is less, within the error allowed band.As depicted in figs. 1 and 2, the bottom of floating top column 7 by jar at the bottom of 9 surface support.Preferably; In order between the surface at the floating top column 7 and jar end, to form buffer protection; As shown in Figure 2; Said outer floating roof metal can 1 also comprises upright supports plate 12, and on the surface at the bottom of this upright supports plate 12 is fixedly connected on jar (as through welding), the bottom of said floating top column 7 contacts with said upright supports plate 12.That is to say that floating top column 7 is not directly to contact with (surface) at the bottom of the jar 9, but contacts with a jar end 9 through this upright supports plate 2 indirectly.Upright supports plate 12 is generally a plurality of, and the number of upright supports plate 12 equates that with the number of floating top column 7 that is to say, a upright supports plate 12 supports a floating top column 7.
Specifically; Floating top column 7 as shown in Figure 2; After the top of utilization jar end absolute altitude chi 8 these floating top columns 7 of acquisition and the distance L 5 of level planar S, the length L 4 of this distance L 5, floating top column 7 adds that the thickness of upright supports plate 12 is jar end level measurement value in the position at this floating top column 7 places.If have angle theta between top column 7 and the vertical and float; Then above-mentioned L5, L4cos θ add that the thickness of upright supports plate 12 is the jar end level measurement value in the position at this floating top column 7 places, has wherein carried out angle modification to the length L 4 of floating top column 7.
Further preferably, the area on said upright supports plate 12 and said jar of contacted surface, the end is greater than the area of said floating top column 7 with upright supports plate 12 contacted surfaces, with suffered pressure at the bottom of reducing jar.
Outer floating roof metal can 1 is the known outer floating roof metal cans of those of ordinary skills, can be used for storing heavy or light crude usually, light-end products such as gasoline, kerosene or diesel oil or water etc.In band liquid detects,, then can directly be with liquid to detect if storage medium is heavy oil products such as crude oil, residual oil; And if storage medium is light-end products, then for the sake of security, water is with liquid to detect after light-end products are replaced again usually.
Usually, outer floating roof metal can 1 comprises columniform tank body and in tank body, is provided with a plurality of floating tops column 7 and on floating top 2 that said floating top, the situation lower edge column 7 that keeps in touch with inner tank wall can move up and down.Be the volume of oil product physical holding of the stock at the jar end 9 of floating top 2, outer floating roof metal can 1 and the spatial volume that inwall limited of outer floating roof metal can 1.As depicted in figs. 1 and 2, floating top column 7 passes said floating top 2 along the direction that is parallel to the central axis of said outer floating roof metal can 1 usually, and the bottom of each floating top column 7 contacted with a jar end 9.
According to provided by the present invention jar of end level measurement method, when measuring jar end absolute altitude, the testing staff stand on the floating top 2 absolute altitude at the bottom of the jar is measured.
The definite of level planar S (as shown in Figure 1) can known by one of skill in the art method carry out (confirming through existing spirit-leveling instrument usually).For example, can confirm this level planar S according to the method for confirming the horizontal water directrix plane among the national metrological verification regulations JJG168-2005.
Specifically, when choosing the level planar S, spirit-leveling instrument is adsorbed on the inwall of outer floating roof metal can 1; Thereby with this spirit-leveling instrument leveling; Thereby confirm the level planar S, this level planar S is vertical with the central axis of said metal can 1, that is to say; This level planar S and surface level parallel, and in jar end level measurement subsequently, use as benchmark.Because level measurement at the bottom of operating personnel stand in and carry out on the floating top 2 jar, thereby this level planar S is higher than floating top 2, and this level planar S also is higher than the top on floating top 2.
Preferably, this level planar S is also used as benchmark in level measurement at the bottom of the jar.Thereby, jar bottom side portion level measurement that relates in the capacity calibrating at the bottom of to jar with jar an end level measurement adopt same level planar S to use as benchmark, the verification result accuracy of capacity is higher at the bottom of making jar.
As shown in Figure 2, under the situation that the level planar S is confirmed through spirit-leveling instrument 4, the reading of absolute altitude chi 8 at the bottom of can directly reading jar through spirit-leveling instrument, thus obtain the top of floating top column 7 and the distance L 5 of level planar S.
More than jar end level measurement method provided by the present invention is described in detail.In addition; The present invention also provides capacity calibration method at the bottom of a kind of band flow container; The capacity calibration method is used for the outer floating roof metal can at the bottom of this band flow container, and the capacity calibration method comprises at the bottom of the said band flow container: a jar bottom side portion level measurement and a jar end level measurement, calculate the capacity at jar end according to said jar of bottom side portion level measurement and a jar jar bottom side portion level measurement value that end level measurement obtains and a jar end level measurement value; Wherein, said jar end level measurement according to above-mentioned band flow container at the bottom of the level measurement method carry out.
In capacity calibration method at the bottom of this jar; When measuring jar end absolute altitude; Need not to resemble and to float top column 7 in the tradition jar end absolute altitude detection method and extract again one by one and measure; But directly measure the top of floating top column 7 and the distance between the level planar S, and can obtain the jar end level measurement value at each place, column 7 positions, floating top, easy and simple to handle and safe and reliable.
There is following defective at least in (in the band liquid-in metrological verification method that provides like CN1664498A to jar bottom side portion level measurement method) in traditional jar bottom side portion level measurement method: in to the level measurement of jar bottom side portion; Be to measure in the tank body outside, the data reduction that then outside is recorded is jar elevation data of interior jar bottom side portion.Because the tank bottom external margin nearly all is in the perk state because of tank body weight; And be used in the tank body outside and record data need to convert the limit standard laid down by the ministries or commissions of the Central Government of tank interior several times to high; Therefore the error of measuring is bigger, and is the time of day that data are difficult to reflect jar bottom side portion to the tank body external detection.
Therefore, the precision of traditional jar bottom side portion level measurement is lower, thereby the calibration accuracy of capacity is also relatively low at the bottom of causing jar.In provided by the present invention jar of end calibration method, also jar bottom side portion level measurement method is improved, specifically describe as follows:
In provided by the present invention jar of end capacity calibration method, the band flow container bottom side portion level measurement method that is used for the outer floating roof metal can comprises the steps:
In the girth sheets 10 of the floating top of said outer floating roof metal can 1 more than 2, confirm basic girth sheets 3, and a plurality of measurement points evenly are set (at interval) around the circumference of this basis girth sheets 3;
Confirming level planar S (preferably, the level planar S in this level planar S and the above-mentioned jar end level measurement method is same level plane) above the floating top 2;
At each said measurement point; Along contact a jar bottom side portion until the bottom of this jar bottom side portion absolute altitude chi 5 in the gap between the edge that jar bottom side portion absolute altitude chi 5 is inserted said floating top 2 perpendicular to the direction of said level planar S and said metal can 1 inwall, the top of said jar bottom side portion absolute altitude chi 5 is higher than said level planar S; Thereby obtain the jar bottom side portion level measurement value of each said measurement point.
As shown in Figure 1, the tank body of metal can 1 comprises a plurality of girth sheets 10, and each girth sheets 10 all surrounds cylindrical and be fixedly connected sequentially (like welding) together, thereby constitutes whole tank body.
According to provided by the present invention jar of bottom side portion detection method, when detecting, the testing staff stand on the floating top 2 jar bottom side portion absolute altitude is measured.
Specifically; Because the operating personnel that stand on the floating top 2 can see or touch the girth sheets of floating top more than 2; Therefore at first in the girth sheets 10 of the floating top of said metal can 1 more than 2, confirm basic girth sheets 3; Thereby pass through the position that this basis girth sheets 3 is confirmed measurement points, and a plurality of measurement point (a are set around the even compartment of terrain of circumference of this basis girth sheets 3
1, a
2... A
n).
Here, the selection of basic girth sheets 3 so that operating personnel be operating as principle and select.For example, basic girth sheets 3 is and floating top 2 contacted girth sheets that perhaps basic girth sheets 3 is and the floating adjacent girth sheets in top that pushes up 2 contacted girth sheets.
About a plurality of measurement point (a
1, a
2... A
n) selection can confirm according to principle known in the field, for example can be according to selecting about the method for selecting measurement point among the national metrological verification regulations JJG168-2005.Usually, measurement point (a
1, a
2... A
n) number add up to even number.When girth was less than or equal to 100m, the arc length of adjacent measurement points must not surpass 3m, and measurement point number sum minimum must not be less than 12; During greater than 100m, the arc length of adjacent measurement points must not surpass 4m at girth, and measurement point number sum must not be less than 36.And, a plurality of measurement point (a
1, a
2... A
n) should along the circumferential direction evenly distribute.
For example, as shown in Figure 3, after having confirmed basic girth sheets 3, evenly confirmed 24 measurement points along the inwall of basic girth sheets 3, so that carry out a jar bottom side portion level measurement subsequently.
For the ease of directly read jar measured value of bottom side portion absolute altitude chi 5 through spirit-leveling instrument, preferably, this level planar S is set to: with the bottom of jar bottom side portion absolute altitude chi 5 with after a jar bottom side portion contact, the top of jar bottom side portion absolute altitude chi 5 is higher than said level planar S.Therefore, can directly read the measured value of the jar bottom side portion absolute altitude chi that is positioned at a measurement point, thereby directly obtain measured value at the jar bottom side portion absolute altitude of this measurement point through spirit-leveling instrument.
In order to confirm spirit-leveling instrument 4 to be adsorbed in the level planar S on the inwall of basic girth sheets 3 more accurately, thereby behind the level-off and be convenient to the operation back and confirm the level planar S.Can also on the position that is positioned at metal can 1 center on floating top 2, set the center measurement point, and a spirit-leveling instrument 4 (as shown in Figure 1) that is positioned at the center is set on this center measurement point, thereby can further improve the precision of determined level planar S.Employed here spirit-leveling instrument 4 can be existing spirit-leveling instrument 4 known in the field.
Accomplish after the confirming of level planar S, respectively at each said measurement point (a
1, a
2... A
n), along contacting a jar bottom side portion 6 until the bottom of this jar bottom side portion absolute altitude chi 5 in the gap between the edge that jar bottom side portion absolute altitude chi 5 is inserted said floating top 2 perpendicular to the direction of said level planar S and said metal can 1 inwall.
With a measurement point is that example is explained, as shown in Figure 1, and jar bottom side portion absolute altitude chi 5 passes the slit between the inwall of edge and metal can 1 on floating top 2 and gets in the space of 2 belows, floating top, contacts with a jar bottom side portion 6 up to the bottom of jar bottom side portion absolute altitude chi 5.Longitudinal direction and the level planar S of jar bottom side portion absolute altitude chi 5 are perpendicular, thereby can be through the measured value of this jar bottom side portion absolute altitude chi 5 definite jar bottom side portion in this measurement point, promptly and the distance between the level planar S.
As shown in Figure 4; At this measurement point; The top of jar bottom side portion absolute altitude chi 5 is higher than said level planar S; And the measurement starting point of jar bottom side portion absolute altitude chi 5 be this an absolute altitude chi 5 and jar bottom side portion 6 contacted positions, so the measured value L1 of the jar bottom side portion absolute altitude chi 5 that directly reads through spirit-leveling instrument 4 is in this measurement point jar bottom side portion level measurement value.That is to say that the distance L 1 between the intersection point of jar bottom side portion absolute altitude chi 5 and level planar S and the bottom of this jar bottom side portion absolute altitude chi 5 is the jar bottom side portion level measurement value in this measurement point.
Can obtain the jar bottom side portion level measurement value of jar bottom side portion thus, and then accomplish the measurement of jar bottom side portion absolute altitude in each said measurement point.
Said metal can 1 also comprises around the O-ring seal 11 at these 2 edges, floating top (usually by comprise rubber, plastics elastomeric material process).During gap between the inwall of edge that jar bottom side portion absolute altitude chi 5 is inserted floating top 2 and metal can 1; If the pressure between O-ring seal 11 and metal can 1 inner tank wall is less, can be directly with jar bottom side portion absolute altitude chi 5 insert in the gap between the inwall of edge and metal can 1 on floating top 2 and the bottom that makes this jar bottom side portion absolute altitude chi 5 up to jar bottom side portion 6.
And if the pressure between O-ring seal 11 and metal can 1 inner tank wall is bigger; For fear of O-ring seal 11 is caused damage; Preferably; Before jar bottom side portion absolute altitude chi 5 is inserted the edge and the gap between said metal can 1 inwall on said floating top 2, said O-ring seal 11 is strutted edge and the gap between said metal can 1 inwall (for example, can O-ring seal 11 be strutted to obtain bigger gap with wooden stick, bamboo pole etc.) to form said floating top 2.
Because band flow container bottom side portion level measurement method provided by the present invention is carried out under the band liquid status; Therefore; When the bottom with jar bottom side portion absolute altitude chi 5 is inserted into jar bottom side portion 6; The length L 1 of this jar bottom side portion absolute altitude chi 5 needs to satisfy the top that makes this jar bottom side portion absolute altitude chi 5 and is higher than floating top 2, thereby be convenient to operating personnel the top of this jar bottom side portion absolute altitude chi 5 and the distance between the level planar S is measured.
Therefore, preferably, the length of said jar of bottom side portion absolute altitude chi 5 is not less than 3 meters.Further preferably, the length of said jar of bottom side portion absolute altitude chi is 3 meters to 3.5 meters, thereby can be applicable to that multiple band flow container bottom side portion detects and the workplace of jar end calibrating.
More than a jar bottom side portion measuring method that the jar bottom side portion level measurement that relates to of jar end capacity calibration method that is used for the outer floating roof metal can is adopted describe in detail.Because in capacity calibration method at the bottom of this jar; The detection of jar bottom side portion absolute altitude directly detects the jar bottom side portion through jar bottom side portion absolute altitude chi; Therefore compare with the detection method of existing indirect conversion jar bottom side portion absolute altitude, the precision of the testing result of of the present invention jar of end capacity calibration method is higher.Because the measurement to the jar bottom side portion describes in detail hereinbefore, no longer it is given unnecessary details here.
The detection method of absolute altitude at the bottom of the jar is carried out in the prior art (like national metrological verification regulations JJG168-2005 or CN1664498A) and can utilize, thereby obtain a jar end level measurement value for level measurement at the bottom of the jar.After obtaining jar bottom side portion level measurement value and jar end level measurement value, the capacity at the bottom of how calculating jar is well known in the art.For example, can handle through the requirement among the national metrological verification regulations JJG168-2005.For example, can carry out jar according to geometric measurement method at the bottom of the capacity calibrating.
Confirming of measurement point: at the bottom of the jar, confirm concentric circles (m); In 360 degree in the center of circle, confirming with the center of circle to be the n bar ray of starting point; Angle between the adjacent ray equates that all (in as shown in Figure 5, n=8 is according to different application scenarios; Can select the ray of different bar numbers), then many rays and concentrically ringed intersection point are measurement point.
Concentric circles confirms that according to the long-pending condition that equates of anchor ring branch the radius of each annulus calculates as follows to the distance at jar center, the end:
Each donut to centre distance:
●
●
●
R
m＝R
In the formula: R: the first girth sheets inside radius;
M: the quantity of five equilibrium annulus.
The jar bottom side portion level measurement of measurement point and a jar end level measurement: promptly obtain a jar bottom side portion level measurement value and a jar end level measurement value; Wherein, Jar end level measurement value can obtain through provided by the present invention jar of end level measurement method, and the jar bottom side portion level measurement method that comprises in the capacity calibration method at the bottom of jar bottom side portion level measurement value band flow container provided by the present invention then capable of using is measured acquisition.
Measure a jar end with geometric measurement method, jar end capacity (jar following capacity Δ of end peak V
B) be calculated as follows:
Wherein: Δ V
B---jar end capacity is height h
dFunction;
h
d---the height of establishment end amount capacities chart;
D---the first girth sheets interior diameter;
B
0, i, B
1, i... B
M, i---each measurement point absolute altitude;
B
Base---following gauge point absolute altitude;
F (h
d, B
M, n, B
Base)---SQL defines as follows:
Here, following gauge point is meant: through the free drop wire of last gauge point and the joining on metering plate surface, be called gauge point down, be also referred to as zero point.(metering plate: being positioned under the dip hatch, holding the horizontal metal plate of ullage rule hammer during dipping, is the location-plate of following gauge point.) height of establishment end amount capacities chart is meant: this is interval for gauge point is to a jar end peak down, and this interval capacity is called end amount.Following gauge point absolute altitude is meant: by the height of the measured following gauge point of absolute altitude chi to the reference level face.
A kind of band flow container bottom side portion level measurement method and a jar end calibration method that is used for the outer floating roof metal can provided by the present invention more than described.Those skilled in the art will be appreciated that; For the calibrating of outer floating roof metal can also comprise detection to each girth sheets diameter, to the detection of the detection of metal can tank body radial missing, degree of tilt and to detecting the aspects such as processing of the data that obtain, but the present invention relates generally to the content to the high context of detection of the limit standard laid down by the ministries or commissions of the Central Government at the bottom of the jar.Therefore, for the otherwise detection of outer floating roof metal can, can carry out with reference to the relevant regulations among the existing national metrological verification regulations JJG168-2005.For example; Measurement for annex in the jar; If reinspection metal can; The data of annex can be with reference to the raw measurement data of last one-period then jar, if do not go up the one-period raw data, and can be through consulting the data such as shape, physical dimension and terminal of interior each annex of jar that jar construction drawing writes down.
Level measurement method and jar end capacity calibration method are all carried out under band liquid situation at the bottom of the band flow container provided by the present invention; That is to say; Level measurement is not carried out after need the liquid (like various oil products) in the metal can 1 not being emptied with the calibrating of a jar end capacity at the bottom of this jar, just can carry out the detection at the bottom of the jar but in this metal can 1, store under the situation of liquid.Therefore, can not influence the normal production and operating activities of enterprise, thereby can avoid owing to the detection to (and metal can) at the bottom of the jar causes bigger economic loss.
Though above specific embodiments of the invention has been carried out detailed description; But it is exemplary or descriptive that above description to the specific embodiment of the invention is merely; The present invention is not limited to this; Above-mentioned each characteristic, step and/or method can be used with the any-mode of independent and/or combination in zone of reasonableness understood by one of ordinary skill in the art, and protection scope of the present invention is limited claims.
Claims (10)
- One kind the band flow container at the bottom of the level measurement method; The level measurement method is used for outer floating roof metal can (1) at the bottom of this band flow container; This outer floating roof metal can (1) comprises floating (2) and a plurality of floating top columns (7) of pushing up; These a plurality of floating top columns (7) pass said floating top (2) and by supporting at the jar end of said outer floating roof metal can (1), the level measurement method comprises at the bottom of the said band flow container:Confirm a level plane (S);Utilize a jar end absolute altitude chi (8) to measure the top of said floating top column (7) and the distance between the said level plane (S), thereby obtain the jar end level measurement value at each place, floating top column (7) position.
- 2. level measurement method at the bottom of the band flow container according to claim 1; Wherein, Said outer floating roof metal can (1) also comprises upright supports plate (12); On the surface at the bottom of this upright supports plate (12) is fixedly connected on jar; The bottom of said floating top column (7) contacts with said upright supports plate (12), and the jar end level measurement value at each place, said floating top column (7) position equals top and the distance between the said level plane (S), the length of this floating top column (7) and the thickness sum of said upright supports plate (12) of this floating top column (7).
- 3. level measurement method at the bottom of the band flow container according to claim 2, wherein, the area on said upright supports plate (12) and said jar of contacted surface, the end is greater than the area of said floating top column (7) with the contacted surface of upright supports plate (12).
- 4. according to level measurement method at the bottom of claim 1, the 2 or 3 described band flow containers, wherein, the longitudinal direction of said floating top column (7) is vertical with said level plane (S).
- One kind the band flow container at the bottom of the capacity calibration method; The capacity calibration method is used for the outer floating roof metal can at the bottom of this band flow container; The capacity calibration method comprises at the bottom of the said band flow container: a jar bottom side portion level measurement and a jar end level measurement; Calculate the capacity at jar end according to said jar of bottom side portion level measurement and a jar jar bottom side portion level measurement value that end level measurement obtains and a jar end level measurement value; Wherein, said jar end level measurement according to any described band flow container among the claim 1-4 at the bottom of the level measurement method carry out.
- 6. capacity calibration method at the bottom of the band flow container according to claim 5; Wherein, Said jar of bottom side portion level measurement comprises: confirm basic girth sheets (3) in the girth sheets more than the floating top (2) of said outer floating roof metal can (1), and around the circumference of this basis girth sheets (3) a plurality of measurement points are set equably;At each measurement point; Along contact a jar bottom side portion until the bottom of this jar bottom side portion absolute altitude chi (5) in the gap between the edge that jar bottom side portion absolute altitude chi (5) is inserted said floating top (2) perpendicular to the direction on said level plane (S) and said metal can (1) inwall, the top of said jar bottom side portion absolute altitude chi (5) is higher than said level plane (S);Obtain the jar bottom side portion level measurement value of each said measurement point.
- 7. capacity calibration method at the bottom of the band flow container according to claim 6; Wherein, In each said measurement point, the distance between the intersection point on said jar bottom side portion absolute altitude chi (5) and said level plane (S) and the bottom of said jar of bottom side portion absolute altitude chi (5) is the jar bottom side portion level measurement value of this measurement point.
- 8. capacity calibration method at the bottom of the band flow container according to claim 6, wherein, said basic girth sheets (3) is and the contacted girth sheets in said floating top (2), perhaps said basic girth sheets (3) is the adjacent girth sheets in top with the contacted girth sheets in said floating top (2).
- 9. according to capacity calibration method at the bottom of any described band flow container among the claim 6-8; Wherein, Said outer floating roof metal can (1) also comprises around the O-ring seal (11) that should float (2) edge, top; Before jar bottom side portion absolute altitude chi (5) is inserted the edge and the gap between said outer floating roof metal can (1) inwall on said floating top (2), said O-ring seal (11) is strutted with the edge that forms said floating top (2) and the gap between said outer floating roof metal can (1) inwall.
- 10. capacity calibration method at the bottom of the band flow container according to claim 9, wherein, the length of said jar of bottom side portion absolute altitude chi is 3 meters to 3.5 meters.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100340414A CN102128578B (en) | 2010-01-12 | 2010-01-12 | Method for measuring elevation of bottom of tank with liquid and method for measuring volume of bottom of tank with liquid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010100340414A CN102128578B (en) | 2010-01-12 | 2010-01-12 | Method for measuring elevation of bottom of tank with liquid and method for measuring volume of bottom of tank with liquid |
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| CN102128578B true CN102128578B (en) | 2012-07-25 |
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| US9188472B2 (en) * | 2013-05-21 | 2015-11-17 | Saudi Arabian Oil Company | Enhanced reference line tank calibration method and apparatus |
| US10697820B2 (en) | 2018-02-06 | 2020-06-30 | Saudi Arabian Oil Company | Self-calibrating base station for offset measurements |
Citations (1)
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|---|---|---|---|---|
| CN1664498A (en) * | 2005-03-24 | 2005-09-07 | 国家大容量第一计量站 | Liquid-in metrological verification method for vertical metallic tank with an outer floating roof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664498A (en) * | 2005-03-24 | 2005-09-07 | 国家大容量第一计量站 | Liquid-in metrological verification method for vertical metallic tank with an outer floating roof |
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| 刘宪英.立式金属罐罐底容量的近似计算方法.《中国测试技术》.2006,(第05期), * |
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