WO1994026627A1 - A method and a monitoring system for monitoring the inclination of a floating roof - Google Patents
A method and a monitoring system for monitoring the inclination of a floating roof Download PDFInfo
- Publication number
- WO1994026627A1 WO1994026627A1 PCT/DK1994/000193 DK9400193W WO9426627A1 WO 1994026627 A1 WO1994026627 A1 WO 1994026627A1 DK 9400193 W DK9400193 W DK 9400193W WO 9426627 A1 WO9426627 A1 WO 9426627A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- floating roof
- monitoring system
- monitoring
- liquid
- inclination
- Prior art date
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 239000002828 fuel tank Substances 0.000 claims abstract description 3
- 235000014676 Phragmites communis Nutrition 0.000 claims description 5
- 230000000717 retained effect Effects 0.000 claims 1
- 230000000254 damaging effect Effects 0.000 abstract description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- HEFNNWSXXWATRW-UHFFFAOYSA-N Ibuprofen Chemical compound CC(C)CC1=CC=C(C(C)C(O)=O)C=C1 HEFNNWSXXWATRW-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
- B65D88/00—Large containers
- B65D88/34—Large containers having floating covers, e.g. floating roofs or blankets
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/18—Measuring inclination, e.g. by clinometers, by levels by using liquids
-
- 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
- G01F23/68—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 using electrically actuated indicating means
- G01F23/70—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 using electrically actuated indicating means for sensing changes in level only at discrete points
- G01F23/703—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 using electrically actuated indicating means for sensing changes in level only at discrete points using electromechanically actuated indicating means
Definitions
- the invention concerns a method for monitoring the incli- nation of a floating roof with respect to the free liquid surface in a liquid tank, in particular a fuel tank, as stated in the introductory portion of claim 1, as well as a monitoring system for performing said method.
- floating roofs for this purpose are usually manufac- ture as large steel structures and have a weight of the order of 50-180 tons and a diameter about 25 meters, it is extremely important to ensure that the floating roof does not capsize in case of failure in some of the buoyancy means positioned in the floating roof.
- capsizing of the floating roof may e.g. cause the floating roof to sink into the liquid.
- cap- sizing of the floating roof may cause the floating roof to wedge in the structure of the tank, which, when e.g. fuel is discharged from the tank, might result in a catastrophy if it subsequently falls down. This may cause the genera ⁇ tion of sparks that ignite the oil product, which results in an explosion.
- the object of the present invention is therefore to pro ⁇ vide a method and a monitoring system for floating roofs, ensuring that it is always possible to monitor the incli- nation of the floating roof in a simple manner so as to prevent the above-mentioned damaging effects.
- Claims 2, 3, 5, 6, and 7 define embodiments in which the system is more in the nature of an alarm system that be ⁇ gins to operate when the inclination of the floating roof becomes critical, which is achieved in a particularly in ⁇ expensive and uncomplicated manner.
- Claim 10 defines an embodiment which makes it simple to adjust and calibrate the monitoring system, the advantage being that the system is simple to adapt to many different floating roof structures, including floating roofs which are in operation.
- fig. 1 is a schematic top view of a floating roof provided with a monitoring system according to the invention.
- fig. 2 is a lateral cross-section of the floating roof at one of the liquid level gauges shown in fig. 1.
- Fig. 1 shows an example of a floating roof having a moni ⁇ toring system according to the invention, where the rest of the tank structure is omitted for clarity.
- the floating roof has an annular floating roof pontoon 20 and a central one-plate or two-plate floating roof structure 25.
- the central structure 25 includes four groups of liquid level gauges 10 which are spaced from the center of the floating roof and are positioned at a mutual angle of 90° with re- spect to the center. To obtain the best possible effect of the system, the liquid level gauges are located as far as possible away from the center of the floating roof, which means in the vicinity of the floating roof pontoon 20.
- the liquid level gauges are connected to the monitoring unit 15 via the signal lines 12.
- the monitoring unit 15 which may expediently be located in a control room adapted for the purpose, may be formed by a simple alarm or a more complicated calculating unit for writing measurement values, as required.
- Fig. 2 shows a cross-section of the floating roof at one of the liquid level gauges 10 shown in fig. 1.
- the liquid surface in the tank is indicated by the broken line 30.
- the liquid level gauge 10 comprises a vertical pipe 50 having an interiorly located concentric pipe 60.
- a ring- shaped float 40 is slidable in a vertical direction in the space between the pipes 50, 60. This space is downwardly defined by a blocking face having oil inlet openings 58.
- the float 40 thus floats on the liquid surface 30 in the pipe 50.
- the pipe 50 is defined by a blocking plate 70 having two tightening elements 72, 74 which have cooperating conical faces.
- a termination box 80 which connects the liquid level gauge 10 to the monitoring unit 15 of the tank, is provided at the top of the pipe 60.
- the pipe 60 is interiorly provided with a printed circuit board having a plurality of reed contacts which are ac ⁇ tuated by a magnet arranged in the float 40. Since the printed circuit board in the pipe 60 is provided with a reed contact which is actuated when the float 40 is in the expected position of the liquid level, a shift of the reed contact will be recorded when the float 40 moves away from its expected position.
- the reed contact registers this as soon as the float 40 with its active magnetic field has been moved a few centimeters away from it.
- the monitoring system then gives an alarm signal, making it possible to prevent damage which may be a consequence of the inclination of the floating roof.
- the system lends itself for incorporation into floating roofs of very different structures. In connection with floating roofs which are in use, it will thus also be possible to incor- porate the monitoring system while the tank is in opera ⁇ tion, e.g. in one of the pipes in the supporting legs of the floating roof.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Fluid Mechanics (AREA)
- Level Indicators Using A Float (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention concerns a method for monitoring the inclination of a floating roof with respect to the free liquid surface in a liquid tank, in particular a fuel tank, whereby measurements of the height of the liquid surface with respect to the floating roof are performed at a plurality of spaced areas in the floating roof, following which the measurement values are transmitted to a monitoring unit which relates the measurement values from the individual areas to each other and generates a signal in response to this to indicate the inclination of the floating roof. This enables constant monitoring of the inclination of the floating roof in a simple manner, so that damaging effects because of e.g. wedging of the floating roof can be avoided.
Description
A method and a monitoring system for monitoring the in¬ clination of a floating roof
The invention concerns a method for monitoring the incli- nation of a floating roof with respect to the free liquid surface in a liquid tank, in particular a fuel tank, as stated in the introductory portion of claim 1, as well as a monitoring system for performing said method.
In connection with large liquid tanks, in particular fuel and oil tanks at refineries and the like, which are cap¬ able of holding large amounts of oil products, use is fre¬ quently made of a floating roof which floats on the liquid in the tank and is therefore displaceable in a vertical direction, so that it is capable of following the level of the liquid when the liquid is discharged from or filled into the tank. Floating roofs of this type are used for preventing leakage of hydrocarbon gases from the tank and ingress of e.g. rainwater from the surroundings, and at the same time the floating roof reduces the size of the empty space above the oil product, thereby reducing the amount of hydrocarbon gases in vapour form.
Since floating roofs for this purpose are usually manufac- ture as large steel structures and have a weight of the order of 50-180 tons and a diameter about 25 meters, it is extremely important to ensure that the floating roof does not capsize in case of failure in some of the buoyancy means positioned in the floating roof.
Such capsizing may cause great damage.
Thus, capsizing of the floating roof may e.g. cause the floating roof to sink into the liquid. In addition, cap- sizing of the floating roof may cause the floating roof to
wedge in the structure of the tank, which, when e.g. fuel is discharged from the tank, might result in a catastrophy if it subsequently falls down. This may cause the genera¬ tion of sparks that ignite the oil product, which results in an explosion.
The object of the present invention is therefore to pro¬ vide a method and a monitoring system for floating roofs, ensuring that it is always possible to monitor the incli- nation of the floating roof in a simple manner so as to prevent the above-mentioned damaging effects.
This is achieved by the method defined in the character¬ izing portion of claim 1 and by the monitoring system de- fined in claim 4.
It is hereby made possible to monitor the inclination of the floating roof automatically and continuously, already at quite small degrees of inclination of the floating roof.
Claims 2, 3, 5, 6, and 7 define embodiments in which the system is more in the nature of an alarm system that be¬ gins to operate when the inclination of the floating roof becomes critical, which is achieved in a particularly in¬ expensive and uncomplicated manner.
The subject-matter defined in claims 8 and 9 provides par¬ ticularly reliable embodiments, which are additionally ex- pedient in connection with containers containing inflam¬ mable liquids.
Claim 10 defines an embodiment which makes it simple to adjust and calibrate the monitoring system, the advantage being that the system is simple to adapt to many different floating roof structures, including floating roofs which
are in operation.
An embodiment of the invention will be described more fully below with reference to the drawing, in which
fig. 1 is a schematic top view of a floating roof provided with a monitoring system according to the invention, and
fig. 2 is a lateral cross-section of the floating roof at one of the liquid level gauges shown in fig. 1.
Fig. 1 shows an example of a floating roof having a moni¬ toring system according to the invention, where the rest of the tank structure is omitted for clarity. The floating roof has an annular floating roof pontoon 20 and a central one-plate or two-plate floating roof structure 25. The central structure 25 includes four groups of liquid level gauges 10 which are spaced from the center of the floating roof and are positioned at a mutual angle of 90° with re- spect to the center. To obtain the best possible effect of the system, the liquid level gauges are located as far as possible away from the center of the floating roof, which means in the vicinity of the floating roof pontoon 20. The liquid level gauges are connected to the monitoring unit 15 via the signal lines 12.
The monitoring unit 15, which may expediently be located in a control room adapted for the purpose, may be formed by a simple alarm or a more complicated calculating unit for writing measurement values, as required.
Fig. 2 shows a cross-section of the floating roof at one of the liquid level gauges 10 shown in fig. 1. The liquid surface in the tank is indicated by the broken line 30. The liquid level gauge 10 comprises a vertical pipe 50 having an interiorly located concentric pipe 60. A ring-
shaped float 40 is slidable in a vertical direction in the space between the pipes 50, 60. This space is downwardly defined by a blocking face having oil inlet openings 58. The float 40 thus floats on the liquid surface 30 in the pipe 50. Upwardly, the pipe 50 is defined by a blocking plate 70 having two tightening elements 72, 74 which have cooperating conical faces.
It is hereby possible to adjust the position of the pipe 60, thereby enabling calibration and adjustment of the equipment. A termination box 80, which connects the liquid level gauge 10 to the monitoring unit 15 of the tank, is provided at the top of the pipe 60.
The pipe 60 is interiorly provided with a printed circuit board having a plurality of reed contacts which are ac¬ tuated by a magnet arranged in the float 40. Since the printed circuit board in the pipe 60 is provided with a reed contact which is actuated when the float 40 is in the expected position of the liquid level, a shift of the reed contact will be recorded when the float 40 moves away from its expected position.
Thus, if the floating roof does not follow the liquid level 30, the reed contact registers this as soon as the float 40 with its active magnetic field has been moved a few centimeters away from it. The monitoring system then gives an alarm signal, making it possible to prevent damage which may be a consequence of the inclination of the floating roof.
Since it is possible to adjust the position of the pipe 60, enabling calibration of the equipment, the system lends itself for incorporation into floating roofs of very different structures. In connection with floating roofs which are in use, it will thus also be possible to incor-
porate the monitoring system while the tank is in opera¬ tion, e.g. in one of the pipes in the supporting legs of the floating roof.
Claims
1. A method of monitoring the inclination of a floating roof with respect to a free liquid surface in a liquid tank, in particular a fuel tank, c h a r a c t e r i z e d by performing measurements of the heigth of the liquid surface with respect to the floating roof at a plurality of mutually spaced areas in the floating roof, and then transmitting the measurement values to a monitoring unit which relates the measurement values from the individual areas to each other and generates a signal in response to this to indicate the inclination of the floating roof.
2. A method according to claim 1, c h a r a c t e r ¬ i z e d by comparing the measured height with a reference value.
3. A method according to claim 1 or 2, c h a r a c - t e r i z e d in that the signal applied by the monitor¬ ing unit constitutes an indication of whether the inclina¬ tion of the floating roof exceeds a predetermined refe¬ rence value.
4. A monitoring system for use in the performance of the method according to one or more of claims 1-3, c h a ¬ r a c t e r i z e d in that the system comprises a moni¬ toring unit and a plurality of liquid level gauges which are connected to said unit and are adapted to be mounted spaced from each other in areas in the floating roof, and that the liquid level gauges are moreover adapted to apply measuring signals of the level of the liquid with respect to the floating roof, and that the monitoring unit is adapted to relate the received measuring signals to each other and to generate signals in response to this to indi¬ cate the inclination of the floating roof.
5. A monitoring system according to claim 4, c h a - r a c t e r i z e d in that the monitoring system com¬ prises four liquid level gauges.
6. A monitoring system according to claim 4 or 5, c h a ¬ r a c t e r i z e d in that the monitoring unit is adapted to apply a signal if the difference between the measurement values from the various areas exceeds a pre¬ determined reference value.
7. A monitoring system according to one or more of claims 4-6, c h a r a c t e r i z e d in that the liquid level gauges are adapted exclusively to apply a signal if the level of the liquid differs from a predetermined reference range.
8. A monitoring system according to one or more of claims 4-7, c h a r a c t e r i z e d in that the liquid level gauges comprise floats which float on the liquid surface and are displaceable in a vertical direction along respec¬ tive float guides, and that the liquid level gauges have means to detect the position of the floats with respect to the float guides.
9. A monitoring system according to claim 8, c h a ¬ r a c t e r i z e d in that the means for detecting the position of the floats are formed by reed contacts ar¬ ranged in connection with the float guide, and that the floats are provided with magnets.
10. A monitoring system according to claim 8 or 9, c h a ¬ r a c t e r i z e d in that the means for detecting the position of the floats are adapted to be displaced and retained in a vertical direction with respect to the floating roof for reference value calibration and adjust¬ ment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU67939/94A AU6793994A (en) | 1993-05-17 | 1994-05-17 | A method and a monitoring system for monitoring the inclination of a floating roof |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK57493A DK57493D0 (en) | 1993-05-17 | 1993-05-17 | PROCEDURE FOR MONITORING SYSTEM FOR MONITORING OF A FLOAT TAG |
| DK0574/93 | 1993-05-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1994026627A1 true WO1994026627A1 (en) | 1994-11-24 |
Family
ID=8095096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DK1994/000193 WO1994026627A1 (en) | 1993-05-17 | 1994-05-17 | A method and a monitoring system for monitoring the inclination of a floating roof |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU6793994A (en) |
| DK (1) | DK57493D0 (en) |
| WO (1) | WO1994026627A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2264338C2 (en) * | 2003-08-08 | 2005-11-20 | Государственное унитарное предприятие "Институт проблем транспорта энергоресурсов" (ГУП "ИПТЭР") | Floating reservoir roof |
| NL1032192C2 (en) * | 2006-07-18 | 2008-01-21 | Enraf Bv | Storage tank for a liquid. |
| WO2010035201A2 (en) * | 2008-09-24 | 2010-04-01 | Syscor Research And Development Inc. | Apparatus for the wireless remote monitoring of covered floating storage tank roofs |
| WO2013070131A1 (en) * | 2011-11-11 | 2013-05-16 | Rosemount Tank Radar Ab | Monitoring of floating roof tank |
| CN103885467A (en) * | 2012-12-21 | 2014-06-25 | 罗斯蒙特储罐雷达股份公司 | Identifying Undesired Conditions In The Function Of A Floating Roof Of A Tank |
| CN106248169A (en) * | 2015-06-08 | 2016-12-21 | 振华石油（营口）储运有限责任公司 | The measuring method of crude oil liquid level in a kind of outer floating roof crude oil storage tank |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2309790A1 (en) * | 1973-02-27 | 1974-08-29 | Goetzelmann Ind Abwasser | DEVICE FOR MEASURING A LIQUID LEVEL |
| EP0146919A2 (en) * | 1983-12-23 | 1985-07-03 | Pfister GmbH | Method and arrangement for the compensation of floating-roof influences of a tank weighing installation |
-
1993
- 1993-05-17 DK DK57493A patent/DK57493D0/en unknown
-
1994
- 1994-05-17 AU AU67939/94A patent/AU6793994A/en not_active Abandoned
- 1994-05-17 WO PCT/DK1994/000193 patent/WO1994026627A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2309790A1 (en) * | 1973-02-27 | 1974-08-29 | Goetzelmann Ind Abwasser | DEVICE FOR MEASURING A LIQUID LEVEL |
| EP0146919A2 (en) * | 1983-12-23 | 1985-07-03 | Pfister GmbH | Method and arrangement for the compensation of floating-roof influences of a tank weighing installation |
Non-Patent Citations (2)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN, Vol. 12, No. 497, P-806; & JP,A,63 206 611, (KAWASAKI STEEL CORP), 25 August 1988. * |
| PATENT ABSTRACTS OF JAPAN, Vol. 13, No. 334, M-85; & JP,A,1 111 691, (ISHIKAWAJIMA HARIMA HEAVY IND CO LTD), 28 April 1989. * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2264338C2 (en) * | 2003-08-08 | 2005-11-20 | Государственное унитарное предприятие "Институт проблем транспорта энергоресурсов" (ГУП "ИПТЭР") | Floating reservoir roof |
| NL1032192C2 (en) * | 2006-07-18 | 2008-01-21 | Enraf Bv | Storage tank for a liquid. |
| WO2008010702A1 (en) * | 2006-07-18 | 2008-01-24 | Enraf B.V. | Storage tank for a liquid |
| WO2010035201A2 (en) * | 2008-09-24 | 2010-04-01 | Syscor Research And Development Inc. | Apparatus for the wireless remote monitoring of covered floating storage tank roofs |
| WO2010035201A3 (en) * | 2008-09-24 | 2010-05-20 | Syscor Research And Development Inc. | Apparatus for the wireless remote monitoring of covered floating storage tank roofs |
| US9377340B2 (en) | 2011-11-11 | 2016-06-28 | Rosemount Tank Radar Ab | Monitoring of floating roof tank |
| WO2013070131A1 (en) * | 2011-11-11 | 2013-05-16 | Rosemount Tank Radar Ab | Monitoring of floating roof tank |
| RU2607312C2 (en) * | 2011-11-11 | 2017-01-10 | Роузмаунт Танк Радар Аб | Method of monitoring floating roof tank |
| CN103885467A (en) * | 2012-12-21 | 2014-06-25 | 罗斯蒙特储罐雷达股份公司 | Identifying Undesired Conditions In The Function Of A Floating Roof Of A Tank |
| WO2014098696A1 (en) * | 2012-12-21 | 2014-06-26 | Rosemount Tank Radar Ab | Identifying undesired conditions in the function of a floating roof of a tank |
| 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 (en) * | 2012-12-21 | 2017-05-18 | Роузмаунт Танк Радар Аб | Method for determining undesirable conditions for tank floating roof operation |
| CN106248169A (en) * | 2015-06-08 | 2016-12-21 | 振华石油（营口）储运有限责任公司 | The measuring method of crude oil liquid level in a kind of outer floating roof crude oil storage tank |
Also Published As
| Publication number | Publication date |
|---|---|
| AU6793994A (en) | 1994-12-12 |
| DK57493D0 (en) | 1993-05-17 |
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