US20030221482A1 - Liquid volume monitor for pressurized tanks - Google Patents
Liquid volume monitor for pressurized tanks Download PDFInfo
- Publication number
- US20030221482A1 US20030221482A1 US10/159,136 US15913602A US2003221482A1 US 20030221482 A1 US20030221482 A1 US 20030221482A1 US 15913602 A US15913602 A US 15913602A US 2003221482 A1 US2003221482 A1 US 2003221482A1
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- tank
- load cell
- probe
- port
- liquid
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- 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
- G01F23/0038—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 using buoyant probes
Definitions
- This invention relates to apparatus mountable to pressurized liquid hydrocarbon storage tanks for remote monitoring of the volume of contents therein, and more particularly to improvements in monitors which function by suspending a buoyant displacement probe in liquid tank contents from a load cell to measure the apparent weight of the probe.
- LP gas storage tanks area classified as explosion hazards by the National Fire Protection Association, requiring special care in the design and installation of any ancillary equipment.
- the LP Gas Code(NFPA 58) defines the area within 5 feet of any tank, fill opening or point where LP gas is dispensed, loaded, vented or the like as a Class I, Division 1, Group D hazard.
- U.S. Pat. No. 5,157,968 discloses a buoyant displacement probe mounted through a top tank port via a load cell for the determination of the liquid tank content weight. It also provides a second buoyant probe mounted via a load cell through a second tank port, so that the specific gravity of the liquid may be calculated from the second load cell reading and the content weight thus be converted to a volume.
- U.S. Pat. No. 5,614,672 likewise determines content weight by a load cell-mounted buoyant displacement probe. It, however relies for volume determination on an assumption that the specific gravity of the liquid in the tank is a constant, known value.
- the object of this invention is to provide a volume monitoring apparatus which may be readily and safely installed on both new and existing tanks used to store liquid propane, liquid butane or like hazardous liquids.
- An important consideration in this invention is to maintain a high degree of accuracy in the volume determination.
- a device for measuring the liquid volume in a tank including a load cell positioned adjacent a port in the top wall of the tank.
- a downwardly extending displacement probe is supported by the load cell, and has sufficient length so that its lower end is adjacent to, but not touching, the tank bottom.
- a suspension mechanism for the load cell includes a universal joint means allowing the load cell to be oriented horizontally without regard to the orientation of the tank and port.
- the load cell monitors the apparent weight of the probe, and thus the weight of the liquid contents in the tank.
- An elongate temperature probe is mounted in the same port and has at least one temperature sensor for measuring the temperature of the liquid in the tank. This temperature reading may then be used with the known specific gravity-temperature curve of the stored liquid to utilize the specific gravity of the stored liquid at the measured temperature to calculate the volume of the liquid content.
- the displacement probe is an elongate hollow member.
- the temperature probe is a string extending through the open center of the displacement probe, the string carrying a plurality of spaced thermometric units for measuring the temperature of the tank liquid at spaced levels of the tank.
- the preferred form of the invention includes a riser pipe secured in the tank port, a mounting flange threaded on the riser pipe and a flange cap secured to the flange to close the port, the flange cap supporting a hanger bracket from which the load cell and displacement probes are suspended by way of a universal joint assembly which insures that the load cell, in the form of a planar beam sensor is maintained in true horizontal orientation.
- FIG. 1 is a plan view of a monitor constructed in accordance with this invention mounted on a pressurized tank;
- FIG. 2 is a perspective view of the hanger bracket universal joint assembly and load cell of the device of FIG. 1;
- FIG. 3 is a plan view of the portion of the apparatus shown in FIG. 2;
- FIG. 4 is a plan view of the displacement probe and temperature probe of the device of FIG. 1, taken at right angles to the depiction of the probe in FIG. 1;
- FIG. 5 is a horizontal cross-section taken along line 5 - 5 IN FIG. 4;
- FIG. 6 is a schematic illustration of a monitoring system utilizing the invention.
- a storage tank 10 for liquefied propane, butane or similar hazardous liquid is provided with a monitoring apparatus constructed in accordance with the invention by installation through a single top port 12 .
- Existing tanks are conventionally provided with such an inspection port having a two inch diameter, and the preferred form of apparatus of this invention may be readily and safely installed in such a pre-existing port.
- a threaded riser pipe 14 is secured and sealed in port 12 , and extends above the port a few inches. Typically, pipe 14 may be about six inches in length.
- a heavy-duty flange 16 is threaded and sealed to riser 14 .
- Flange may be provided with a circular array of eight bolt holes.
- a flange gasket and flange cover 18 having conventional pressure-proof electrical cable pass-through is secured to flange 16 by conventional means such as bolts 20 to close the port 12 in sealed, pressure-proof fashion.
- a hanger bracket 30 is provided for suspending the in-tank elements of the apparatus.
- Hanger bracket 30 has an upper flange 32 , a lower flange 34 , and a vertically extending web 36 connecting the flanges 32 and 34 .
- a circuit board 38 is mounted on web 36 . The details of construction of board 38 are conventional.
- Board 38 is provided with a plug 37 for connecting to the cabling of the pass-through flange cover 20 to communicate the data received by board 38 .
- Web 36 also carries a temperature sensor 41 for measuring the air temperature in the upper portion of the tank, connected to circuit board 38 . This permits temperature compensation of data from the load cell described below.
- An aperture 40 is provided in upper flange 32 for alignment with the pressure measuring port of the flange cover 18 for measuring tank pressures.
- Upper flange 32 also has a pair of mounting holes 42 for bolting bracket 30 securely to flange cover 18 .
- a universal joint assembly 43 is suspended below hanger bracket 30 .
- the assembly 43 may be any suitable commercially available universal joint assembly, such as Par Number 64565K1 from McMaster-Carr Supply Company, depicted here.
- the upper body 44 of assembly 43 is secured to the lower face of flange 34 by bolt 46 .
- a pair of spaced legs 48 extend downwardly from upper body 44 , and carry an upper horizontal pivot pin 50 .
- the lower body 52 of assembly 43 has upwardly extending spaced legs 54 which carry a lower horizontal pivot pin 56 . Pins 50 and 56 are oriented so that the vertical planes through their axes are mutually perpendicular.
- Each of the pins 50 and 56 extend through a pivoting central body 58 of the universal joint assembly 43 , positioned between legs 48 and 54 .
- This arrangement permits lower body 52 to hang vertically plumb from pin 56 , even if the lower flange 34 of hanger bracket 30 is not oriented horizontally because of a tilt in the tank 10 , the tank port 12 , or for any other reason.
- An upper load cell-mounting u-bracket 60 is secured to the universal joint assembly 43 at its lower bodes 52 by means of a clevis pin 62 secured by a cotter pin 64 .
- U-bracket 60 has a horizontal leg 66 extending therefrom.
- One end of a load cell in the form of a planar beam sensor 70 is secured to leg 66 by means of a first compressionc clamp 72 .
- the opposite end of planar beam sensor 70 is secured to leg 76 of lower u-bracket 78 by second compression clamp 79 .
- the wiring harness 73 of planar beam sensor 70 is connected to circuit board 38 .
- Lower u-bracket 78 is provided with a clevis pin 82 secured by cotter pin 84 for mounting a buoyant displacement probe 90 .
- Probe 90 may be a hollow tubular aluminum extrusion, and includes a vertically extending central passage 92 , as well as vertically extending side chambers 94 provided to lighten probe 90 and increase its buoyancy.
- Annular covers 96 are secured to each end of probe 90 to close chambers 94 while leaving central passage 92 open to the liquid contents of tank 10 .
- a mounting neck 100 extends from the upper end of probe 90 , and is provided with a through-hole 102 for receiving the clevis pin 82 to suspend probe 90 from lower u-bracket 78 .
- a second through-hole 104 is provided in neck 100 , so that a screwdriver or the like may be placed therethrough to support probe 90 on the riser pipe 14 during installation, while the installer makes the wiring connections to circuit board 38 .
- Probe 90 houses a flexible temperature probe string 110 which passes downwardly through open central passage 92 .
- a plurality of temperature sensors 112 are spaced along temperature probe 110 for measuring the temperature of the liquid contents at spaced levels. In the preferred embodiment, the sensors 112 are spaced so that they are suspended at the 5%, 35% and 65% of tank height levels within the tank.
- Each sensor 112 communicates separately with a signal connector 114 located at the upper end of probe 110 .
- Connector 114 plugs into circuit board 38 at temperature plug-in 39 . This plug-in connection is adequate to support the temperature probe string 100 , because of its light weight.
- control box 120 The data conveyed from the load cell 70 to circuit board 38 through wiring harness 73 , and the temperature data coming to the board through connector 114 , is communicated externally of the tank to a microprocessor housed in control box 120 secured atop flange.
- the microprocessor calculates the volume of contents in the tank from: (1) the apparent probe weight data from load cell 70 , compensated for air temperature surrounding load cell 70 as measured by temperature sensor 41 ; (2) the liquid temperature data from probe 110 ; and (3) the specific gravity curve for the stored liquid.
- Control box 120 also houses a radio frequency transmitter/receiver which can transmit the data to a master computer. This eliminates the need for a power hook-up within the hazardous area of the tank, as the microprocessor and radio may be conveniently operated on safe battery power.
- FIG. 5 A suitable arrangement of the monitoring station is depicted in FIG. 5.
- a plurality of tanks with monitors installed as described above communicate by radio to a master computer housed under roof at a nearby location outside the hazardous zone.
- the master computer can be polled periodically by telephone from a remote monitoring station located many miles away.
- the master computer may be a pc used for office or other functions.
Abstract
A monitor for remote reading of liquid volumes in pressured tanks utilizes a hollow buoyant displacement probe extending downwardly from a load cell carried adjacent a top port in the tank. The load cell is suspended from a flange cover acting as a closure for the tank port so that the load cell is freely pivotable on perpendicular horizontal axes, insuring that it is always oriented horizontally. A temperature-reading string is positioned in the open hollow center of the probe and has three spaced temperature sensing units along its length. Force data from the load cell, giving the apparent weight of the probe immersed in the liquid tank contents, and temperature data, from which volumetric data may be calculated, are fed to an external battery-operated microprocessor which periodically radios its data to a central computer which may be polled by phone lines from a remote monitoring station.
Description
- This invention relates to apparatus mountable to pressurized liquid hydrocarbon storage tanks for remote monitoring of the volume of contents therein, and more particularly to improvements in monitors which function by suspending a buoyant displacement probe in liquid tank contents from a load cell to measure the apparent weight of the probe.
- Storage tanks for liquefied hydrocarbon products such as butane and propane present special problems for the safe and ready monitoring of tank volume levels. This is particularly so where the tanks are located in remote or relatively inaccessible locations, making tank inspections inefficient and, inconvenient.
- LP gas storage tanks area classified as explosion hazards by the National Fire Protection Association, requiring special care in the design and installation of any ancillary equipment. The LP Gas Code(NFPA 58) defines the area within 5 feet of any tank, fill opening or point where LP gas is dispensed, loaded, vented or the like as a Class I,
Division 1, Group D hazard. - Despite the daunting nature of the problems involved in safely installing a volume monitor for such a tank it would be desirable to provide for the remote reading of volume levels so that fuel supplies can be maintained in adequate amounts without the necessity of site trips to ascertain the amount of fuel on hand.
- It is known in the measuring art to determine the weight of liquid contents in a tank by suspending a buoyant probe in the liquid from a load cell to measure the apparent weight of the probe. By well-known calculational formulas, such measurement yields the weight of tank contents. Examples of such systems in the prior patent art may be found in U.S. Pat. Nos. 5,614,672, 5,157,968, 5,132,923 and 4,244,218.
- U.S. Pat. No. 5,157,968 discloses a buoyant displacement probe mounted through a top tank port via a load cell for the determination of the liquid tank content weight. It also provides a second buoyant probe mounted via a load cell through a second tank port, so that the specific gravity of the liquid may be calculated from the second load cell reading and the content weight thus be converted to a volume. U.S. Pat. No. 5,614,672 likewise determines content weight by a load cell-mounted buoyant displacement probe. It, however relies for volume determination on an assumption that the specific gravity of the liquid in the tank is a constant, known value.
- Despite these efforts to provide tank monitors employing buoyant displacement probes for monitoring tank contents, there remains a lack of suitable devices employing this principle for safe and ready installation on remote hazardous storage tanks. This invention is directed to apparatus which will satisfy this need by providing an accurate and reliable monitoring system which can be safely installed for monitoring of the liquid contents of hazardous storage tanks.
- The object of this invention is to provide a volume monitoring apparatus which may be readily and safely installed on both new and existing tanks used to store liquid propane, liquid butane or like hazardous liquids. An important consideration in this invention is to maintain a high degree of accuracy in the volume determination.
- In accordance with the invention, there is provided a device for measuring the liquid volume in a tank, including a load cell positioned adjacent a port in the top wall of the tank. A downwardly extending displacement probe is supported by the load cell, and has sufficient length so that its lower end is adjacent to, but not touching, the tank bottom. A suspension mechanism for the load cell includes a universal joint means allowing the load cell to be oriented horizontally without regard to the orientation of the tank and port. The load cell monitors the apparent weight of the probe, and thus the weight of the liquid contents in the tank. An elongate temperature probe is mounted in the same port and has at least one temperature sensor for measuring the temperature of the liquid in the tank. This temperature reading may then be used with the known specific gravity-temperature curve of the stored liquid to utilize the specific gravity of the stored liquid at the measured temperature to calculate the volume of the liquid content.
- In a specific embodiment of the invention, the displacement probe is an elongate hollow member. The temperature probe is a string extending through the open center of the displacement probe, the string carrying a plurality of spaced thermometric units for measuring the temperature of the tank liquid at spaced levels of the tank.
- The preferred form of the invention includes a riser pipe secured in the tank port, a mounting flange threaded on the riser pipe and a flange cap secured to the flange to close the port, the flange cap supporting a hanger bracket from which the load cell and displacement probes are suspended by way of a universal joint assembly which insures that the load cell, in the form of a planar beam sensor is maintained in true horizontal orientation.
- For a more complete understanding of the present invention and for further advantages thereof, reference is now made to the following Description of the Preferred Embodiments taker in conjunction with the accompanying Drawings in which:
- FIG. 1 is a plan view of a monitor constructed in accordance with this invention mounted on a pressurized tank;
- FIG. 2 is a perspective view of the hanger bracket universal joint assembly and load cell of the device of FIG. 1;
- FIG. 3 is a plan view of the portion of the apparatus shown in FIG. 2;
- FIG. 4 is a plan view of the displacement probe and temperature probe of the device of FIG. 1, taken at right angles to the depiction of the probe in FIG. 1;
- FIG. 5 is a horizontal cross-section taken along line5-5 IN FIG. 4; and
- FIG. 6 is a schematic illustration of a monitoring system utilizing the invention.
- As illustrated in the drawings, a
storage tank 10 for liquefied propane, butane or similar hazardous liquid is provided with a monitoring apparatus constructed in accordance with the invention by installation through asingle top port 12. Existing tanks are conventionally provided with such an inspection port having a two inch diameter, and the preferred form of apparatus of this invention may be readily and safely installed in such a pre-existing port. - A threaded
riser pipe 14 is secured and sealed inport 12, and extends above the port a few inches. Typically,pipe 14 may be about six inches in length. A heavy-duty flange 16 is threaded and sealed toriser 14. Flange may be provided with a circular array of eight bolt holes. A flange gasket andflange cover 18 having conventional pressure-proof electrical cable pass-through is secured toflange 16 by conventional means such asbolts 20 to close theport 12 in sealed, pressure-proof fashion. - A
hanger bracket 30 is provided for suspending the in-tank elements of the apparatus.Hanger bracket 30 has anupper flange 32, alower flange 34, and a vertically extendingweb 36 connecting theflanges circuit board 38 is mounted onweb 36. The details of construction ofboard 38 are conventional.Board 38 is provided with aplug 37 for connecting to the cabling of the pass-throughflange cover 20 to communicate the data received byboard 38.Web 36 also carries atemperature sensor 41 for measuring the air temperature in the upper portion of the tank, connected tocircuit board 38. This permits temperature compensation of data from the load cell described below. Anaperture 40 is provided inupper flange 32 for alignment with the pressure measuring port of theflange cover 18 for measuring tank pressures.Upper flange 32 also has a pair ofmounting holes 42 for boltingbracket 30 securely toflange cover 18. - A
universal joint assembly 43 is suspended belowhanger bracket 30. Theassembly 43 may be any suitable commercially available universal joint assembly, such as Par Number 64565K1 from McMaster-Carr Supply Company, depicted here. Theupper body 44 ofassembly 43 is secured to the lower face offlange 34 bybolt 46. A pair ofspaced legs 48 extend downwardly fromupper body 44, and carry an upperhorizontal pivot pin 50. Thelower body 52 ofassembly 43 has upwardly extendingspaced legs 54 which carry a lowerhorizontal pivot pin 56.Pins pins central body 58 of theuniversal joint assembly 43, positioned betweenlegs lower body 52 to hang vertically plumb frompin 56, even if thelower flange 34 ofhanger bracket 30 is not oriented horizontally because of a tilt in thetank 10, thetank port 12, or for any other reason. - An upper load cell-mounting
u-bracket 60 is secured to the universaljoint assembly 43 at its lower bodes 52 by means of aclevis pin 62 secured by acotter pin 64. U-bracket 60 has ahorizontal leg 66 extending therefrom. One end of a load cell in the form of aplanar beam sensor 70 is secured toleg 66 by means of afirst compressionc clamp 72. The opposite end ofplanar beam sensor 70 is secured toleg 76 oflower u-bracket 78 bysecond compression clamp 79. Thus, downward force onlower u-bracket 78 will produce an electrical signal fromplanar beam sensor 70 which measures the magnitude of the force. Thewiring harness 73 ofplanar beam sensor 70 is connected tocircuit board 38. - The effect of universal
joint assembly 43 is to insure thatplanar beam sensor 70 is oriented horizontally. This eliminates the need for measurement and correction for any variation of theload cell 70 from the horizontal. Were thecell 70 permitted to be oriented out of horizontal, its measurements of force would be reduced by the sine of the angle of deviation. Universaljoint assembly 43 eliminates this source of error, and the necessity of compensation. -
Lower u-bracket 78 is provided with aclevis pin 82 secured bycotter pin 84 for mounting abuoyant displacement probe 90.Probe 90 may be a hollow tubular aluminum extrusion, and includes a vertically extendingcentral passage 92, as well as vertically extendingside chambers 94 provided to lightenprobe 90 and increase its buoyancy. Annular covers 96 are secured to each end ofprobe 90 to closechambers 94 while leavingcentral passage 92 open to the liquid contents oftank 10. A mountingneck 100 extends from the upper end ofprobe 90, and is provided with a through-hole 102 for receiving theclevis pin 82 to suspendprobe 90 fromlower u-bracket 78. A second through-hole 104 is provided inneck 100, so that a screwdriver or the like may be placed therethrough to supportprobe 90 on theriser pipe 14 during installation, while the installer makes the wiring connections tocircuit board 38. - Probe90 houses a flexible
temperature probe string 110 which passes downwardly through opencentral passage 92. A plurality oftemperature sensors 112 are spaced alongtemperature probe 110 for measuring the temperature of the liquid contents at spaced levels. In the preferred embodiment, thesensors 112 are spaced so that they are suspended at the 5%, 35% and 65% of tank height levels within the tank. Eachsensor 112 communicates separately with asignal connector 114 located at the upper end ofprobe 110.Connector 114 plugs intocircuit board 38 at temperature plug-in 39. This plug-in connection is adequate to support thetemperature probe string 100, because of its light weight. - The data conveyed from the
load cell 70 tocircuit board 38 throughwiring harness 73, and the temperature data coming to the board throughconnector 114, is communicated externally of the tank to a microprocessor housed incontrol box 120 secured atop flange. The microprocessor calculates the volume of contents in the tank from: (1) the apparent probe weight data fromload cell 70, compensated for air temperature surroundingload cell 70 as measured bytemperature sensor 41; (2) the liquid temperature data fromprobe 110; and (3) the specific gravity curve for the stored liquid.Control box 120 also houses a radio frequency transmitter/receiver which can transmit the data to a master computer. This eliminates the need for a power hook-up within the hazardous area of the tank, as the microprocessor and radio may be conveniently operated on safe battery power. - A suitable arrangement of the monitoring station is depicted in FIG. 5. A plurality of tanks with monitors installed as described above communicate by radio to a master computer housed under roof at a nearby location outside the hazardous zone. The master computer can be polled periodically by telephone from a remote monitoring station located many miles away. Of course, when remote downloading is not required, as where an on-site manned facility exists, the data can be accessed directly at the master computer. Indeed, the master computer may be a pc used for office or other functions.
- Whereas the present invention has been described with respect to specific embodiments thereof, it will be understood that various changes and modifications will be suggested to one skilled in the art and it is intended to encompass such changes and modifications as fall within the scope of the appended claims.
Claims (7)
1. A device for measuring the liquid volume in a tank comprising:
(a) a load cell positioned adjacent a port in the top wall of the tank;
(b) a displacement probe supported by the load cell, and extending down into the tank, the displacement probe having a lower end near the tank bottom, whereby the load measured by the load cell gives the apparent weight of the probe when immersed in the liquid contents of the tank; and
(c) a suspension mechanism mounted at the tank port for supporting the load cell and the probe, including universal joint means to orient the load cell horizontally without regard to the orientation of the tank and the tank port.
2. The device of claim 1 , wherein the suspension mechanism includes a hanger bracket secured in fixed relationship to the tank, supporting the load cell from above the load cell, and the universal joint means comprises a first pivotal mount between the hanger bracket and load call freely pivotable on a first horizontal axis and a second pivotal mount between the hanger bracket and load cell freely pivotable on a second horizontal axis perpendicular to said first horizontal axis.
3. The device of claim 2 , further comprising:
(a) a riser pipe secured in the tank port and extending upwardly therefrom;
(b) a mounting flange threaded onto the riser pipe;
(c) a flange cap secured to the flange, to which the hanger bracket is fastened.
4. The device of claim 1 , further comprising means mounted adjacent said tank port for measuring the temperature of the liquid contents of the tank.
5. The device of claim 4 , wherein the displacement probe has a vertically extending hollow chamber open to the liquid contents of the tank, and supports a temperature measuring string extending downwardly through said hollow chamber, said string having a spaced array of temperature sensors positioned therealong.
6. An apparatus for measuring the volume of liquid in a tank having a top port, comprising:
(a) a riser pipe secured in the port and extending upwardly therefrom;
(b) a flange mounted on the riser pipe;
(c) a flange cover secured to the flange;
(d) a hanger bracket carried by the flange cover;
(d) a load cell suspended from the hanger bracket;
(e) a hollow liquid displacement probe suspended from the load cell, and extending to a lower end adjacent to, but clear from, the tank bottom; and
(f) a spaced array of temperature sensors extending downwardly through the hollow open center of the displacement probe.
7. A device for measuring the liquid volume in a tank comprising:
(a) a load cell positioned adjacent a port in the top wall of the tank;
(b) a displacement probe supported by the load cell, and extending down into the tank, the displacement probe having a lower end near the tan bottom, whereby the load measured by the load cell gives the apparent weight of the probe when immersed in the liquid contents of the tank; and
(c) means associated with the displacement probe for measuring the temperature of the liquid contents of the tank.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/159,136 US6662643B1 (en) | 2002-05-30 | 2002-05-30 | Liquid volume monitor for pressurized tanks |
US10/621,270 US6834544B2 (en) | 2002-05-30 | 2003-07-18 | Liquid volume monitor for pressurized tanks |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US10/159,136 US6662643B1 (en) | 2002-05-30 | 2002-05-30 | Liquid volume monitor for pressurized tanks |
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US10/621,270 Continuation-In-Part US6834544B2 (en) | 2002-05-30 | 2003-07-18 | Liquid volume monitor for pressurized tanks |
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US20030221482A1 true US20030221482A1 (en) | 2003-12-04 |
US6662643B1 US6662643B1 (en) | 2003-12-16 |
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US10/159,136 Expired - Fee Related US6662643B1 (en) | 2002-05-30 | 2002-05-30 | Liquid volume monitor for pressurized tanks |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100242595A1 (en) * | 2009-03-30 | 2010-09-30 | Alan Paine | Tank measurement system using multiple sensor elements |
DE102014119260A1 (en) * | 2014-12-19 | 2016-06-23 | Endress + Hauser Flowtec Ag | Connecting device for an electronics housing and transducer or field device with such a connection device |
CN112357382A (en) * | 2020-10-12 | 2021-02-12 | 浙江亚德复合材料有限公司 | Glass steel wisdom storage tank |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US20060130572A1 (en) * | 2004-12-16 | 2006-06-22 | Northrop Charles L | Tank mass measurement assembly |
US7209865B2 (en) * | 2004-12-29 | 2007-04-24 | Fueling Technologies, Inc. | Method and system for remotely processing volumetric data |
US10935187B2 (en) * | 2017-02-17 | 2021-03-02 | Eagle Field Tech, Inc. | Remote contents monitoring |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US2342696A (en) | 1939-05-30 | 1944-02-29 | Rover Martin | Liquid level gauge |
US4244218A (en) | 1978-10-20 | 1981-01-13 | Eric Thomas Scriven | Fluid measuring device |
US4890492A (en) * | 1988-09-06 | 1990-01-02 | Emhart Industries, Inc. | Differential pressure level sensor with temperature sensing elements |
US4945756A (en) * | 1989-08-08 | 1990-08-07 | Alert Technologies, Inc. | Leakage detection system |
US5132923A (en) | 1990-02-23 | 1992-07-21 | J.A. King & Company, Inc. | System for monitoring storage tanks |
IL93545A (en) | 1990-02-27 | 1992-12-01 | Uri Zfira | Liquid counter |
US5614672A (en) * | 1996-01-23 | 1997-03-25 | Legendre; W. J. | Apparatus for measuring the liquid contents of a tank |
US6202486B1 (en) * | 1998-10-01 | 2001-03-20 | Imaging & Sensing Technology Corporation | Analog liquid level sensor |
-
2002
- 2002-05-30 US US10/159,136 patent/US6662643B1/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100242595A1 (en) * | 2009-03-30 | 2010-09-30 | Alan Paine | Tank measurement system using multiple sensor elements |
US8141421B2 (en) | 2009-03-30 | 2012-03-27 | Alan Paine | Tank measurement system using multiple sensor elements |
DE102014119260A1 (en) * | 2014-12-19 | 2016-06-23 | Endress + Hauser Flowtec Ag | Connecting device for an electronics housing and transducer or field device with such a connection device |
CN112357382A (en) * | 2020-10-12 | 2021-02-12 | 浙江亚德复合材料有限公司 | Glass steel wisdom storage tank |
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US6662643B1 (en) | 2003-12-16 |
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