WO2008010702A1 - Réservoir de liquide - Google Patents

Réservoir de liquide Download PDF

Info

Publication number
WO2008010702A1
WO2008010702A1 PCT/NL2007/000166 NL2007000166W WO2008010702A1 WO 2008010702 A1 WO2008010702 A1 WO 2008010702A1 NL 2007000166 W NL2007000166 W NL 2007000166W WO 2008010702 A1 WO2008010702 A1 WO 2008010702A1
Authority
WO
WIPO (PCT)
Prior art keywords
cover element
storage tank
liquid
detection means
tank according
Prior art date
Application number
PCT/NL2007/000166
Other languages
English (en)
Inventor
Jamaleddine Chfar
Adrianus Leonardus David Van Schie
Jan Leendert Stolk
Bastiaan Zacharias Van Krimpen
Herman Frans Ronald Groenewegen
Original Assignee
Enraf B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Enraf B.V. filed Critical Enraf B.V.
Publication of WO2008010702A1 publication Critical patent/WO2008010702A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/48—Arrangements of indicating or measuring devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/02—Large containers rigid
    • B65D88/06—Large containers rigid cylindrical
    • B65D88/08—Large containers rigid cylindrical with a vertical axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/22—Safety features
    • B65D90/32—Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure
    • B65D90/34—Venting means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
    • G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
    • G01F23/76—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats characterised by the construction of the float

Definitions

  • the invention relates to a storage tank for a liquid, which comprises a bottom and upright walls and which can be closed by means of a cover element that floats on the liquid, which cover element substantially abuts against the upright walls with its circumferential edge, whilst determining means are present for determining the liquid level in the tank.
  • the storage tank according to the introduction above is frequently used in particular in the process industry or in oil refineries for the storage of water or a petroleum product, such as oil or petrol.
  • the determining means are used for determining the level of the liquid in the storage tank in an effective manner in order to thus get a perception of the amount of liquid that is still present in the storage tank.
  • a cover element will be used in the storage tank, which cover element floats on the liquid surface and thus screens the volatile and/or combustible liquid. Since most storage tanks are cylindrical in shape, the cover element is usually circular in shape as well, its dimensions being such that the circumferential edge closely abuts against the inner side of the upright walls of the storage tank.
  • a cover element on a volatile and/or combustible liquid such as petrol
  • a cover element on a volatile and/or combustible liquid provides an effective screening, mechanical imperfections may lead to the cover element getting wedged between the upright walls of the storage tank, or the increased weight from excessive rainfall may result in the cover element moving below the liquid surface and subsequently sinking to the bottom of the storage tank as a result of the slanted position or tilting of the cover element.
  • the object of the invention is to overcome the above drawbacks and provide a device according to the introduction by means of which it can also be determined whether the cover element is positioned at the same level as the liquid surface in the tank and thus covers the liquid in a correct manner.
  • the storage tank is according to the invention furthermore provided with detection means, which detect the position of the cover element in the tank.
  • the detection means are arranged for comparing the detected position of the cover element with the liquid level determined by the determining means, whilst the detection means are further arranged for delivering a warning signal on the basis of the comparison between the detected position of the cover element in the tank and the liquid level determined by the determining means.
  • the detection means comprise at least one position sensor disposed above the cover element, which position sensor detects the position of the cover element on the basis of a detection signal.
  • said at least one position sensor is disposed near the geometric centre of the cover element.
  • a more precise determination of the position of the cover element in the storage tank, by which it can also be determined whether the cover element takes up a slanted or inclined position relative to the liquid surface can be realised in that the detection means used in such a functional embodiment comprise at least three position sensors disposed above the cover element.
  • the detection means are arranged for comparing the positions of the cover element in the tank as detected by the various position sensors with each other and delivering a further warning signal on the basis of said comparison.
  • the detection means detect the position of the cover element in the tank on the basis of the emitted and reflected radar waves, wherein said at least one position sensor is embodied as a radar antenna for emitting radar waves to the cover element and receiving radar waves reflected by the cover element.
  • the cover element is provided, near each position sensor, with a material that reflects the detection signal.
  • Figure 1 shows a first embodiment of a device according to the invention
  • Figure 2 shows a plan view of figure 1.
  • FIG. 1 schematically shows an embodiment of a storage tank according to the invention.
  • the storage tank 10 is built up of upright walls 11 , which are provided with an upper edge 13, and a bottom 12, and is filled with a liquid 1 , usually a petroleum product such as petrol or the like.
  • the liquid 1 is covered by a cover element 15, which to that end floats on the liquid surface 1a.
  • the cover element 15 is usually embodied as a rigid element, which substantially abuts against the inner side of the upright wall 11 with its circumferential edge. The latter is made possible in particular in that such storage tanks are cylindrical in shape, which makes it possible to use circular cover elements.
  • the height of the liquid level relative to the bottom 12 is indicated by the letter H.
  • every standard storage tank 10 is provided with determining means 14, which are arranged for determining said liquid level H.
  • determining means are commonly known and may generally make use of a standpipe 14a, in which the height H of the liquid column collected in the standpipe is measured by means of suitable measuring methods.
  • One measuring method is to make use of radar waves, but it is also possible to make use of a servo float construction.
  • the cover element 15 will get wedged mechanically between the upright walls 11 , so that it can no longer follow the falling and/or rising of the level of the liquid 1 in the storage tank 10. This may lead to undesirable operating conditions, whilst on the other hand the cover element may take up an inclined position, for example under the influence of the weight of the collected rainwater after heavy rainfall, and become partially submerged in the liquid 1 , in an extreme case even sinking into the liquid 1 at an angle in the direction of the bottom 12.
  • the storage tank is according to the invention provided with additional detection means 20, which are arranged for detecting the actual position of the cover element 15 in the storage tank. In this way it is possible to determine in an effective manner whether the cover element 15 is positioned at the same height as the liquid level H of the liquid 1. Furthermore, the detection means 20 may be arranged for comparing the detected position of the cover element 15 in the storage tank 10 with the liquid level H determined by the determining means 14 (by means of the standby 14a).
  • a warning signal may be delivered in an adequate manner.
  • said warning signal may be generated by the detection means 20 and be delivered to the operating staff of the storage tank 10, or on the other hand the two measured values as generated by the detection means 20 and the determining means 14 may be forwarded to a control room, via means yet to be discussed hereinafter, where the values are compared with each other and further action is taken in case of a difference being detected.
  • the detection means 20 comprise at least one position sensor 21 a, whilst three position sensors 21a-21 b-21c are used in the embodiment shown in figures 1 and 2.
  • the position sensor 21 a or, in the case of a multi-sensor embodiment, the position sensors 21a-21c, are mounted to the upper edge 13 of the upright wall of 11 , being oriented above the cover element 15.
  • the detection means 20 comprise one position sensor 21 a, by means of which the actual position of the cover element 15 in the storage tank 10 can be detected. More specifically, said single position sensor 21a is positioned precisely above the geometric centre of the (circular) cover element 15. By comparing the detected position of the cover element 15 with the level H of the liquid surface 1a as determined by the determining means 14, it is possible to determine whether the cover element 15 is still floating on the liquid surface 1a or whether there is a difference between the position of the cover element and the liquid level H.
  • cover element 15 may take up an inclined position and move partially below the liquid level 1a, possibly sinking into the liquid 1 in the direction of the bottom 2.
  • Submersion of the cover element 15, which may or may not be jammed, as a result of a rising liquid surface 1a of the liquid 1 may also lead to undesirable operating conditions, because the liquid 1 is now in open communication with the outside atmosphere, which is of course undesirable in the case of combustible and volatile liquids.
  • the submerged cover element 15 may sink towards the bottom 12 under the influence of the weight of the liquid 1 present thereon.
  • a difference between the position of the cover element and the actual level H of the liquid surface 1a, with the cover element 15 being positioned either above or below the liquid surface number 1 a, can be detected with suitable equipment and may result in a warning signal.
  • the comparison may be carried out by the detection means 20, which are to that end provided with a control unit 23.
  • said control unit 23 forming part of the detection means 20 may be disposed elsewhere, i.e. not on the storage tank, for example in a control room.
  • Said control room may be located some distance away from the tank, where the signals delivered by the detection means 20 (position of the cover element) and by the determining means 14 (height of the liquid level) are received, processed and compared with each other, on the basis of which a suitable warning signal is generated and delivered to the operating staff.
  • FIG 2 a functional embodiment of the storage tank according to the invention is shown, in which the detection means 20 comprise several position sensors, in this embodiment three position sensors 21a-21c, which are mounted to the upper edge 13 of the upright wall 11 at different positions and which are disposed above the cover element 15.
  • the various position sensors 21a-21 c are oriented in such a manner relative to each other that they are spaced about 120° from each other.
  • each position sensor 21a-21 c locally determines the position of the cover element 15 with respect to the tank 10.
  • Each position sensor 21a-21c may to that end be provided with electronics 22a-22c, which receive and process the detection signal generated by the position sensor 21a-21c for the purpose of comparing it to the liquid level determined by the determining means 14.
  • the three-point measurement by means of the three different position sensors 21a-21c makes it possible to determine whether the cover element 15 takes up an inclined or "slanted" position between the upright walls 11.
  • Each position sensor 21a-21 generates a local position signal of the cover element 15, and because the detection means 20 are according to the invention further arranged for comparing said local measuring signals with each other, any inclination or slanting of the cover element between the upright walls 11 will be easy to detect.
  • the cover element 15 takes up a horizontal position between the upright walls 11.
  • the cover element 15 is floating on the liquid surface 1a (the detected deviation is minimal) or whether, if a deviation has been detected, the cover element 15 is positioned far above or far below the determined liquid level H.
  • warning signals may be delivered to the operating staff of the storage tank 10, for example by means of the control unit 23.
  • each position sensor 21a- 21c is provided with control electronics 22a-22c, which are interconnected by means of suitable signal lines 24 and which are furthermore connected to a control unit 23, which likewise receives signals from the determining means 14.
  • the mutual comparison of the measuring signals delivered by the various position sensors 21a- 21c (for detecting any slanting) and/or the comparison between the position of the cover element 15 detected by the detection means 20 and the liquid level H determined by the determining means 14 may also be carried out by the control unit 23 or by suitable control means located elsewhere, for example in a control room of the storage tank 10.
  • said electronics 22a-22c may also be incorporated in the control unit 23 for safety reasons (fire/explosion hazard), which control unit 23 may in turn also be disposed elsewhere, i.e. not on the storage tank but, for example, in a control room, and which receives and processes the measuring signals both from the various position sensors 21a-21 c and from the determining means 14.
  • the control unit 23 can compare the various position signals delivered by the position sensors 21a-21c with each other so as to get a perception of the orientation of the cover element in the storage tank (flat or inclined/slanted).
  • the control unit 23 can also compare the various position signals regarding the position of the cover element 15 with the liquid level H as determined by the determining means 14.
  • the control unit 23 can deliver suitable warning signals in the case of deviations for both comparisons (between the position sensors mutually or between the position sensors and the determining means).
  • the position sensors 21a-21c preferably make use of radar waves for determining the position of the cover element 15 in the storage tank 10.
  • each position sensor 21a-21c possesses a radar antenna directed towards the cover element 15, which radar antenna is arranged for emitting radar waves towards the cover element 15 and for receiving radar waves reflected by the cover element 15.
  • the position of the cover element relative to the radar antenna of the position sensor 21a-21c can then be precisely determined on the basis of the difference in delay between the emitted radar waves and the reflected radar waves.
  • the cover element may be provided, near each position sensor 21 a-21c, with a suitable material 25 that effectively reflects the emitted radar signals to the radar antenna.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Level Indicators Using A Float (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

La présente invention concerne un réservoir de stockage de liquide qui comprend un fond et des parois verticales et qui peut se fermer à l'aide d'un élément couvercle qui flotte sur le liquide. Ledit élément couvercle vient sensiblement buter contre les parois verticales avec son bord circonférentiel. Les moyens de détermination servent à déterminer le niveau de liquide dans le réservoir. Pour obtenir une perception adéquate de la position de la surface du liquide et de celle de l'élément couvercle flottant sur le liquide, le réservoir de stockage est équipé, selon la présente invention, de moyens de détection qui détectent la position de l'élément couvercle dans le réservoir de stockage.
PCT/NL2007/000166 2006-07-18 2007-07-03 Réservoir de liquide WO2008010702A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1032192A NL1032192C2 (nl) 2006-07-18 2006-07-18 Opslagtank voor een vloeistof.
NL1032192 2006-07-18

Publications (1)

Publication Number Publication Date
WO2008010702A1 true WO2008010702A1 (fr) 2008-01-24

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ID=37684995

Family Applications (1)

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PCT/NL2007/000166 WO2008010702A1 (fr) 2006-07-18 2007-07-03 Réservoir de liquide

Country Status (2)

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NL (1) NL1032192C2 (fr)
WO (1) WO2008010702A1 (fr)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8186214B2 (en) 2007-09-04 2012-05-29 Enraf B.V. Method and device for determining the level L of a liquid within a specified measuring range by means of radar signals transmitted to the liquid surface and radar signals reflected from the liquid surface
US8224594B2 (en) 2008-09-18 2012-07-17 Enraf B.V. Apparatus and method for dynamic peak detection, identification, and tracking in level gauging applications
US8234084B2 (en) 2009-03-17 2012-07-31 Enraf B.V. Apparatus and method for automatic gauge reading in an inventory control and management system
US8271212B2 (en) 2008-09-18 2012-09-18 Enraf B.V. Method for robust gauging accuracy for level gauges under mismatch and large opening effects in stillpipes and related apparatus
US8319680B2 (en) 2006-02-22 2012-11-27 Enraf B.V. Radar liquid level detection using stepped frequency pulses
WO2013070131A1 (fr) * 2011-11-11 2013-05-16 Rosemount Tank Radar Ab Contrôle de cuve à toit flottant
US8631696B2 (en) 2008-08-12 2014-01-21 Enraf, B.V. Apparatus and method for monitoring tanks in an inventory management system
US8659472B2 (en) 2008-09-18 2014-02-25 Enraf B.V. Method and apparatus for highly accurate higher frequency signal generation and related level gauge
US8670945B2 (en) 2010-09-30 2014-03-11 Honeywell International Inc. Apparatus and method for product movement planning to support safety monitoring in inventory management systems
CN103885467A (zh) * 2012-12-21 2014-06-25 罗斯蒙特储罐雷达股份公司 识别容器的浮置顶部的运行中的不期望的状况
US8997549B2 (en) 2010-09-23 2015-04-07 Honeywell International Inc. Apparatus and methods for automatically testing a servo gauge in an inventory management system
US9046406B2 (en) 2012-04-11 2015-06-02 Honeywell International Inc. Advanced antenna protection for radars in level gauging and other applications
CN105346881A (zh) * 2015-10-21 2016-02-24 中国石油化工股份有限公司 外浮顶储罐浮盘水平状态监控系统
US9336074B2 (en) 2013-07-26 2016-05-10 Honeywell International Inc. Apparatus and method for detecting a fault with a clock source
US20160229627A1 (en) * 2015-02-06 2016-08-11 Honeywell International Inc. Floating roof monitoring with laser distance measurement
CN106248169A (zh) * 2015-06-08 2016-12-21 振华石油（营口）储运有限责任公司 一种外浮顶原油储罐内原油液位高度的测量方法
EP3505878A1 (fr) * 2017-12-22 2019-07-03 Endress+Hauser Consult AG Procédé pour détecter l'inclinaison d'un toit flottant sur un milieu stocké dans un réservoir
CN110406818A (zh) * 2019-07-16 2019-11-05 河北旭日汇阳能源科技有限公司 一种具有储罐浮盘状态输出能力的浮盘式储罐系统及方法
WO2019238384A1 (fr) * 2018-06-14 2019-12-19 Endress+Hauser Consult Ag Procédé et système de détection d'un état défectueux dans la mesure du niveau d'un milieu dans un réservoir
CN112357382A (zh) * 2020-10-12 2021-02-12 浙江亚德复合材料有限公司 一种玻璃钢智慧储罐
EP3792198A1 (fr) * 2019-09-12 2021-03-17 Rosemount Tank Radar AB Surveillance de toit flottant

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
US7965182B2 (en) 2008-02-08 2011-06-21 Honeywell International Inc. Apparatus and method for providing a failsafe-enabled wireless device
US7891229B2 (en) 2008-05-13 2011-02-22 Enraf B.V. Method and apparatus for real-time calibration of a liquid storage tank level gauge

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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8319680B2 (en) 2006-02-22 2012-11-27 Enraf B.V. Radar liquid level detection using stepped frequency pulses
US8186214B2 (en) 2007-09-04 2012-05-29 Enraf B.V. Method and device for determining the level L of a liquid within a specified measuring range by means of radar signals transmitted to the liquid surface and radar signals reflected from the liquid surface
US8631696B2 (en) 2008-08-12 2014-01-21 Enraf, B.V. Apparatus and method for monitoring tanks in an inventory management system
US8224594B2 (en) 2008-09-18 2012-07-17 Enraf B.V. Apparatus and method for dynamic peak detection, identification, and tracking in level gauging applications
US8271212B2 (en) 2008-09-18 2012-09-18 Enraf B.V. Method for robust gauging accuracy for level gauges under mismatch and large opening effects in stillpipes and related apparatus
US8659472B2 (en) 2008-09-18 2014-02-25 Enraf B.V. Method and apparatus for highly accurate higher frequency signal generation and related level gauge
US8234084B2 (en) 2009-03-17 2012-07-31 Enraf B.V. Apparatus and method for automatic gauge reading in an inventory control and management system
US8997549B2 (en) 2010-09-23 2015-04-07 Honeywell International Inc. Apparatus and methods for automatically testing a servo gauge in an inventory management system
US8670945B2 (en) 2010-09-30 2014-03-11 Honeywell International Inc. Apparatus and method for product movement planning to support safety monitoring in inventory management systems
US9377340B2 (en) 2011-11-11 2016-06-28 Rosemount Tank Radar Ab Monitoring of floating roof tank
WO2013070131A1 (fr) * 2011-11-11 2013-05-16 Rosemount Tank Radar Ab Contrôle de cuve à toit flottant
US9046406B2 (en) 2012-04-11 2015-06-02 Honeywell International Inc. Advanced antenna protection for radars in level gauging and other applications
CN103885467A (zh) * 2012-12-21 2014-06-25 罗斯蒙特储罐雷达股份公司 识别容器的浮置顶部的运行中的不期望的状况
US9163973B2 (en) 2012-12-21 2015-10-20 Rosemount Tank Radar Ab Identifying undesired conditions in the function of a floating roof of a tank
RU2619808C2 (ru) * 2012-12-21 2017-05-18 Роузмаунт Танк Радар Аб Способ определения нежелательных условий для функционирования плавающей крыши резервуара
WO2014098696A1 (fr) * 2012-12-21 2014-06-26 Rosemount Tank Radar Ab Identification de conditions indésirables dans le fonctionnement d'un toit flottant d'un réservoir
US9336074B2 (en) 2013-07-26 2016-05-10 Honeywell International Inc. Apparatus and method for detecting a fault with a clock source
EP3059186A1 (fr) * 2015-02-06 2016-08-24 Honeywell International Inc. Surveillance de toit flottant avec mesure de distance par laser
US10384866B2 (en) 2015-02-06 2019-08-20 Honeywell International Inc. Floating roof monitoring with laser distance measurement
US20160229627A1 (en) * 2015-02-06 2016-08-11 Honeywell International Inc. Floating roof monitoring with laser distance measurement
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