CN1061660A - Measure the device of hold-up tank water bottom level and leakage - Google Patents
Measure the device of hold-up tank water bottom level and leakage Download PDFInfo
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- CN1061660A CN1061660A CN 91109188 CN91109188A CN1061660A CN 1061660 A CN1061660 A CN 1061660A CN 91109188 CN91109188 CN 91109188 CN 91109188 A CN91109188 A CN 91109188A CN 1061660 A CN1061660 A CN 1061660A
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- 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
- G01F23/14—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 measurement of pressure
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Abstract
A kind of differential pressure pickup that is used for measuring the water level of the water of assembling under the hold-up tank bottom treatment liquid.This differential pressure pickup is measured the pressure reduction between first and second unit penstock, wherein first unit penstock is positioned under the last water level of the bigger water of proportion, and second unit penstock that has contained the purification pipe of more low-gravity treat liquid is positioned on the last water level of water and leads in hold-up tank.Described pressure reduction is the function of the manometric head of the proportion of water or density and water.Just can determine the height of water in the hold-up tank according to this pressure differential and specific gravity data.This device can with present pot static pressure measuring system compatibility.
Description
The present invention relates to measure a kind of high sensitivity hold-up tank monitoring system of the last water level of the impurity that is in hold-up tank bottom such as water, the present invention also can be used for the Leak Detection of hold-up tank.
In the large-scale hold-up tank that is equipped with as the treat liquid (process liquids) of oil etc., some undesirable impurity as have than the depositing in water of the bigger proportion of treat liquid long-pending and accumulate in jar at the bottom of, be commonly referred to the bottom (water bottom).The bottom is the bigger impurity of density as along loosening top cover and by sealing the rainwater that Lou advances in the jar, is used for helping product is pumped into from ground the injection water of jar, and the seawater that is used for ballast when the oil tanker shipping.The escape hole whether the last water level of understanding water reaches jar is a particular importance, the escape hole of jar usually above jar at the bottom of one to three foot, the treat liquid of any discharge will contain very a high proportion of water.In addition, the liquid or solid thing that water and other undesirable density are bigger will shorten causing corrosion at the bottom of the jar life-span of jar, therefore often take and remove.
A kind of method of measuring jar middle water level is to use two airhoods (air bell), puts within another for one, and each all has an opening and be communicated with a tensimeter at different water levels, sees United States Patent (USP) 4084435 for details.The shortcoming of this method is that this system must insert in the jar.And cover body will accurately be located near at the bottom of the jar, and a jar end is not always surperficial uniformly.
Another method of measuring water level also is to utilize tensimeter to see United States Patent (USP) 1622794 for details.The shortcoming of this technology is a full of liquid and prover pipe is full of a certain amount of impurity (water) always in the jar, so produce a fixing datum pressure head (reference.head).
Many to have static pressure jar measuring system (HTG) be to measure amount of fluid in the jar by quality, 7500 systems that produce as Rosemount company (Eden Prairie Minnesota).Present HTG system utilizes the pressure transducer of two separation usually, it be in the static pressure head differing heights down that produces by treat liquid also apart one give fixed distance.Near at the bottom of first pressure transducer (pressure transmitter) is used for measuring jar static pressure, second pressure transducer are used for measuring the static pressure apart from first pressure transducer one known distance.The quality of treat liquid is directly proportional with the area that the pressure that the lower position sensor measures multiply by the level of jar.Its density then and the difference between two pressure that measure divided by the height between two pressure transducer pressure taps or the distance proportional.The liquid level of treat liquid and volume then can calculating by quality and density.
Yet, when the water with specific gravity bigger than treat liquid at the bottom of the jar reaches first (lower) sensor, HTG just is easy to when quality and density calculation make mistakes, because will suppose that in the above contained material of first pressure transducer only be the treat liquid with uniform density.Therefore, though HTG can accurately carry out overall control to the treat liquid with uniform density, and can be full-automatic, yet present HTG system does not possess the ability of the water level of the water of accurately measuring jar end.
Another problem of liquid hold-up tank is to leak.When relating to large-scale hold-up tank, when being the hold-up tank of 20-50 foot such as diameter, just may produce that a large amount of treat liquid is lost to ground and jar in the very little situation of treat liquid liquid level change.One of method that detects leakage is to use the visual observations mirror, yet its precision that detects the liquid level subtle change is relatively poor, and is acted upon by temperature changes.The pressure that another kind method is to use pressure transducer to measure pot bottom changes, in above-mentioned documents, the volume of liquid can vary with temperature, quality then can not.
People wish to obtain a kind of instrument, and it can not only accurately measure the pot bottom water level, and are easy to convert to the hold-up tank leakage detector of a pinpoint accuracy, in addition, people also wish this instrument can with present HTG system compatible.
The invention provides a kind of simplification and high-precision device, this device can be used to measure be in hold-up tank bottom and the density below the lower treat liquid of density when higher impurity such as water on water level.This device can be automatically maintains the last liquid level of impurity below the escape hole of treat liquid, in order to avoid impurity and treat liquid are together discharged.This device is easy to convert to leak detection system, this system can realize automatically control and with the HTG system compatible.
In first most preferred embodiment, in first liquid level one pressure hole is arranged according to the single lower range differential pressure pickup of conventional design, be used for receiving treat liquid and be in first liquid level and top higher first static pressure pressure that impurity produced of density.The low pressure hole of sensor is in the liquid level identical substantially with first liquid level and obtains second static pressure pressure from the purification pipe (purged column) that only contains treat liquid.Described purification pipe communicates with jar from the plane that is higher than water level on the impurity.Differential pressure pickup detects by being in the pressure reduction that impurity caused higher with density above it first liquid level by high pressure and low pressure hole, and provide an output, this output representative is with respect to the last water level of the impurity of first liquid level, calculation element receives this output valve, and can receive with one, the device of the specific gravity data of stores processor liquid and impurity is connected, and calculates the last water level of impurity in the known manner according to specific specific gravity data and the output valve that receives.The common pressure effect (mutually) that the treat liquid at sensor two ends produces is offset, and makes to use the differential pressure pickup with degree of precision of a lower range to become possibility.
In second most preferred embodiment, a valve has been installed, between purification pipe and hold-up tank in order to selectively pressure in the purification pipe and hold-up tank are come every edge, so that device can accurately detect the leakage of hold-up tank.The part of purification pipe extends upward, and a certain position of the liquid in being higher than hold-up tank communicates with jar.When shutting valve, produce a fixing benchmark liquid level in the purification pipe, its height is identical with the height of total amount of liquid in the hold-up tank.Any variation that liquid height sends subsequently in jar all can produce proportional pressure reduction by differential pressure pickup and change.The output valve of sensor be not leakage rate absolute value but with the ratio that is varied to of liquid level.Give the fixed time through one behind the valve closing, sensor produces an initial reading.When opening valve, produce second reading, the pressure differential on the differential pressure pickup both sides that reflect between the initial reading and second reading and the ratio that is varied to of liquid level.Thereby be reduced the degree of accuracy that improves Leak Detection owing to give the error that zero drift produced of fix time interior temperature difference and sensor.Keep temperature constant to help the stable of reading sensor and purification pipe.Because the counteracting of common manometric head effect can be used the high-precision sensor of lower range, therefore the leakage value that detects is very accurate.
Device of the present invention can with general static pressure system compatible because this sensor can join with the used flange that gives the jar that installs earlier in the common HTG system.The present invention does not indicate, and that is to say that whole device can place outside the hold-up tank, as needs, also can place in the jar.
Fig. 1 is the sketch of the water-bed measuring system of the present invention, demonstrates the principle of measuring water level in hold-up tank.
Fig. 2 is the sketch of second kind of form of the present invention, can convert water-bed measuring system to leak detection system.
With reference to Fig. 1, contain two kinds of liquid with the liquid hold-up tank shown in 10 with different specific gravity or density, comprising than water light specific gravity, low density treat liquid 12, and be in higher impurity or the water 14 of density under the treat liquid 12, comprising sediment.In the present embodiment, hold-up tank 10 has a bottom 16, and water impurity is deposited on this, is commonly referred to the bottom.Water-bed measuring system 20 links to each other with hold-up tank, and this system can place hold-up tank 10, or places outside the hold-up tank 10 by shown in Figure 1.
The hole 24 of purification pipe 22 on being arranged in water level 26 taps into hold-up tank 10, and this water level 26 is the interface of treat liquid 12 and water 14, preferably is lower than the exhaust opening 28 at liquid level 30 places, and the jar that therefore always is lower than hold-up tank 10 is gone up liquid level 32.Purification pipe 22 extends downward purge valve 34, and this valve is controlled by controller 36 automatically by control line 38, before any measurement with purification pipe in contained any impurity in the contained liquid 40, purify away as water.
Differential pressure pickup 42, such as Rosemount company (Eden, Prairie, Minhesota) the 3051 C types of Sheng Chaning, has a pressure hole 44, this aperture is linked to each other by the hole 48 that passage 46 and hold-up tank 10 were positioned near jar end 16, measures the manometric head P that water 14 and more low-gravity treat liquid 12 by high specific weight cause
1 Low pressure hole 50 is connected at height and the purification pipe 22 identical substantially with pressure hole 44 via passage 52, measures manometric head P
2And as datum pressure, pressure P
2Only produce, because purification pipe 22 has surpassed water level 26 by the lower treat liquid of the proportion in purification pipe 22 and the hold-up tank 10.The differential pressure probe 54 of sensor 42 measures the poor P between high- low pressure hole 44 and 50 respectively
1-P
2, this pressure reduction is that the existence by the water 14 of the high specific weight on the hole 48 forms.Sensor 42 is by line 56 outputs one and the proportional sensing output signal of pressure reduction, such as a DC current or the numeral output in the 4-20MA scope, this signal is delivered to the receiver 58 in the electronic circuit 60, and electronic circuit 60 can comprise logical circuit or based on the system of microprocessor.Because high- low pressure hole 44 and 50 is in respectively on the identical substantially surface level, offset by the common pressure effect that treat liquid 12 produces, so can use highly sensitive lower range differential pressure pickup to measure the small pressure reduction that forms by higher density water 14.
Give when deciding water level when water level 26 surpasses, can drive sound-track engraving apparatus or produce chimes of doom with output valve 68.Counter 64 can be by control line 72 automatic start-up control devices 36 to open draining valve 70, draining valve 70 links to each other with osculum 74, osculum leads to the water 14 in the hold-up tank, can eject reduction water level 26 by water 14 and other impurity that will accumulate in bottom 16, remain under the exhaust opening 28 to guarantee water level 26.Controller 36 can pass through control line 78 operation valves 76, and valve 76 links to each other with hold-up tank exhaust opening 28, so that discharge treat liquid 12 selectively.Counter 64 can calculate the quality of water 14 and treat liquid 12, promptly multiply by the function of the vertical height in the jar 10 by the horizontal area with known water and treat liquid.
In order to reduce the measuring error (temperature makes expansion of liquids) that is caused by temperature, differential pressure pickup 42 should be linked hold-up tank 10 by passage 46, and as far as possible near pot bottom 16, valve 34 and 70 should be on the identical substantially surface level.Passage 46 or 52 and purification pipe 22 should use and make with the hold-up tank identical materials and completely cut off with the external world, and should promptly join on the Northern Hemisphere in one side back to the sun on north and hold-up tank.
What Fig. 2 showed is second most preferred embodiment of the present invention, and this embodiment is the leakage of measuring the height and the jar of water level.In the present embodiment, with the similar measuring system of the described measuring system of first most preferred embodiment 20 with link to each other with hold-up tank.
The pressure hole 44 of sensor 42 is connected through the hole 48 of passage 46 and two-way valve and hold-up tank 10, and purification pipe 86 is led to through passage 52 and two-way valve 84 in the low pressure hole 50 of differential pressure pickup 42.Purification pipe 86 extends downward purge valve 34, this valve can be controlled by controller 36 automatically by control line 38 as previously mentioned, extend upwardly to passage 88, this passage leads to the storage canister through the hole 89 that is on the liquid level 32, so just can make in the pipe liquid 40 and treat liquid 12 bear same vapour pressure.Purification pipe 86 also leads to passage 90, this passage joins through valve 94 and passage 92, passage 92 leads to the hole 24 of hold-up tank 10 in a certain position that is higher than on the water level 26, its position is preferably lower than exhaust opening 28, when purification pipe 86 purifies before doing any measurement like this, have only more low-gravity treat liquid 12 to be drawn into purification pipe 86.
When valve 94 was opened, measuring system 80 was measured water level 26 according to the mode of describing in first most preferred embodiment.When beginning to carry out jar leakage measuring instrumentation, valve 94 cuts out selectively, such as it being closed by control line 96 by controller 36, purification pipe 86 is got by the pressure of passage 90 and 92 with hold-up tank 10 and is cut off, and measuring system 80 just can be used as jar leak detector and uses.The reference fluid 40 that is made of treat liquid 12 maintains the constant liquid level 98 corresponding to surface level 100, like this, when liquid level 32 owing to jar leaking, evaporation, just can causing pressure P when concentrating the variation that valve leak etc. takes place
1Variation, also just become the variation of the pressure reduction between pressure hole 44 and the low pressure hole 50.The pressure reduction that differential pressure probe is visited high- low pressure hole 44 and 50 respectively changes, and these pressure reduction change the ratio that is varied to liquid level 32, and sensor 42 spreads out of a sensing output signal that changes in proportion to line 56.Give the leakage rate of fixing time jar for calculating behind the shut-off valve 94 through one, produce a initial reading corresponding to liquid level 32 by sensor 42.When valve 94 was changed selectively, such as being opened it through control line 90 by controller 36, the pressure contact between purification pipe 86 and the hold-up tank 10 was recovered, and after this produced second reading corresponding to liquid level 32 by sensor 42.Between the initial number that counter 64 transmits according to line 56 and second reading variation of sensing output signal and specific gravity data 62 calculate one give regularly in the absolute change value of liquid level 32, operand store 66 provides represent jar output valve 68 of leakage.Because the time interval between the initial reading and second reading is very short, temperature difference and the caused error of sensor 42 zero drifts reduce greatly.If it is uniform in-plane that hold-up tank 10 has from vertical direction, as the Cylinder of end location, just the liquid level change of liquid 32 area with this face on duty can calculate leakage rate so.
Because the counteracting of common pressure effect, and when the measuring basis liquid level and jar leakage the time, only run into very little pressure reduction variation, differential pressure pickup 42 can be a kind of highly sensitive lower range sensor, therefore, provides high-precision leakage measuring instrumentation.
Two-way valve 82 is positioned between pressure hole 44 and 48, links to each other with the path 10 2 that leads to low pressure hole 50.Two-way valve 84 is positioned between low pressure hole 50 and the prover pipe 86, and can link to each other to the path 10 4 of pressure hole 44.Change the switch of valve 82 and 84 selectively and switch, such as making its switch by control line 100 and 108 respectively by controller 36, valve 82 just can make the bigger water 14 of proportion at 48 places in the hole lead to low pressure hole 50 through path 10 2 so, cuts off the pressure contact with pressure hole 44.Equally, valve 84 can make reference fluid 40 with lower specific gravity lead to the pressure hole of differential pressure pickup 42 through path 10 4, cuts off the pressure contact with low pressure hole 50, when by switching 82 and 84 when shifting one's position, manometric head P
1And P
2Exchanged with getting in touch of pressure hole 44 and low pressure hole 50, make counter can calculate pressure reduction mean value, thereby eliminated the error that zero drift produced by differential pressure probe 54 by the probe 54 of the transducing signal representative of line 56.To be positioned in the differential pressure pickup 42 such as valvular manifold, also can make pressure P
1And P
2Lead to opposite pressure port in a similar manner.
Device disclosed in this invention can with existing those already installed HTG system compatibles that comprises.
Although the present invention is described with reference to most preferred embodiment, these those skilled in the art should recognize spirit and the scope that can carry out the modification of form and details and not break away from the present invention.
Claims (12)
1, be used for being connected the device between first and second unit penstocks, wherein first unit penstock links to each other with hold-up tank by first hole in first liquid level, second unit penstock links to each other with a purification pipe in the position identical substantially with first liquid level, first liquid with first specific gravity is housed in the hold-up tank and has second liquid bigger than first liquid specific gravity, first liquid level forms a boundary surface layer on the between on second liquid and first liquid level, first liquid is housed in the purification pipe, second hole by hold-up tank communicates with hold-up tank, second hole communicates with hold-up tank at the liquid level place that is lower than on first liquid, provide the first roughly the same fluid pressure head to first and second unit penstock, this device can provide the output valve of expression interface height, and this device comprises:
Be connected on and measure its pressure reduction between first and second unit penstocks and export the device of the output of representing its pressure difference;
Receive and store the device of representing the relevant specific gravity data of first and second liquid;
Be connected to pressure output, in order to calculate as the height of the boundary surface layer of the function of pressure reduction output valve and data and the device of the expression output that this height produced is provided.
2, according to the device of claim 1, also comprise discharging valve device, this device is connected with the escape hole that leads to hold-up tank, in order to selectively first liquid is discharged from hold-up tank.
3, according to the device of claim 2, the device that wherein calculates the liquid level of second liquid also comprises the device that first signal can be provided to discharging valve device, selectively discharging valve device is controlled.
4, according to the device of claim 1, wherein also comprise the bleeder valve device that leads to second liquid, selectively second liquid is released from jar.
5, according to the device of claim 4, the device that wherein calculates second liquid level also comprises the device that secondary signal is provided to hold-up tank bleeder valve device, to control hold-up tank bleeder valve device selectively.
6, according to the device of claim 1, comprising the purge valve device that links to each other with purification pipe, selectively purification pipe is purified.
7, according to the device of claim 6, the device that wherein calculates second liquid level also comprises the device that the 3rd signal can be provided to the purge valve device, to control the purge valve device selectively.
8, according to the device of claim 1, wherein also comprise the isolation valve device that is positioned between second hole and the purification pipe, stop the circulation of first liquid and first liquid in the hold-up tank of purification pipe selectively, the variation of the pressure reduction that obtains thus output has just shown the variation of first kind of liquid level in the hold-up tank.
9, according to the device of claim 1, wherein purification pipe places outside the hold-up tank.
10, according to the device of claim 1, wherein also comprise the zero drift means for influencing that links to each other with the device of measuring pressure reduction, in order to receive first and second unit penstocks on this device with exchanging and to be used to provide average pressure reduction output valve, in order to eliminate the error of the zero drift effect of measuring Differential Pressure Unit.
11, be connected in device between first and second unit penstock, wherein first unit penstock is positioned at first liquid level of the hold-up tank that first and second liquid are housed, second pressure port links to each other with the purification pipe that first liquid is housed, second liquid has bigger specific gravity and is under first liquid, liquid level then is positioned on first liquid level on it, second unit penstock and first unit penstock are in same surface level substantially, and this device comprises:
Be connected on the pipe guide between purification pipe and the hold-up tank, this device leads to first liquid in the hold-up tank on the liquid level of the interface that is formed by first and second liquid;
Be connected on the device of measuring its pressure reduction between first and second unit penstocks and exporting pressure difference;
The device that joins and first liquid in the purification pipe and first liquid in the hold-up tank are kept apart with pipe guide in order to closure catheter for closing device selectively, thus the variation of first liquid level in the hold-up tank has just been represented in the variation of pressure difference.
12, according to the device of claim 11, wherein also comprise:
Receive the device of the specific gravity data relevant with first and second liquid with storage;
The device that links to each other with pressure reduction output, in order to the liquid level of calculating as second liquid of the function of pressure reduction output valve and relevant data, wherein, when the device of closure catheter for closing device was opened selectively, described calculation element provided an output of representing second liquid level to be produced.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US58826490A | 1990-09-26 | 1990-09-26 | |
| US588,264 | 1990-09-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1061660A true CN1061660A (en) | 1992-06-03 |
Family
ID=24353153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91109188 Pending CN1061660A (en) | 1990-09-26 | 1991-09-25 | Measure the device of hold-up tank water bottom level and leakage |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1061660A (en) |
| WO (1) | WO1992005408A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100392362C (en) * | 2006-06-30 | 2008-06-04 | 中国科学院合肥物质科学研究院 | Liquid level transmitter for sealed oil tank |
| CN108871703A (en) * | 2017-05-10 | 2018-11-23 | 高仪股份公司 | The water meter with control device for detecting the method for the leakage in fluid pipeline and for implementing this method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4203099A1 (en) * | 1992-02-04 | 1993-08-05 | Bosch Gmbh Robert | METHOD AND DEVICE FOR DETECTING TANK LEVEL |
| CN104035453A (en) * | 2014-05-29 | 2014-09-10 | 中冶南方工程技术有限公司 | Method for detecting oil-water interface height of oil groove in bottom of gas chamber and device thereof |
| CN107764361B (en) * | 2017-09-13 | 2024-04-30 | 美核电气（济南）股份有限公司 | Purging system and method for differential pressure measurement of nuclear power station |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1255333B (en) * | 1924-12-25 | 1967-11-30 | Deutsche Erdoel Ag | Device for determining the height of the contact surface between salt water and liquid gas in underground liquid gas storage facilities |
| US3371534A (en) * | 1966-05-10 | 1968-03-05 | Foxboro Co | Level sensing apparatus |
| US4638656A (en) * | 1984-10-17 | 1987-01-27 | The Foxboro Company | Apparatus and method for calibrating span of pressure measuring instruments |
| US4643025A (en) * | 1985-06-03 | 1987-02-17 | Stone Gerald P | System for measuring liquid level in a pressurized vessel |
| DE3541613A1 (en) * | 1985-11-25 | 1987-05-27 | Kraftwerk Union Ag | METHOD AND DEVICE FOR MEASURING THE LEVEL IN A REACTOR PRESSURE CONTAINER IN A BOILING WATER REACTOR |
-
1991
- 1991-09-20 WO PCT/US1991/006868 patent/WO1992005408A1/en unknown
- 1991-09-25 CN CN 91109188 patent/CN1061660A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100392362C (en) * | 2006-06-30 | 2008-06-04 | 中国科学院合肥物质科学研究院 | Liquid level transmitter for sealed oil tank |
| CN108871703A (en) * | 2017-05-10 | 2018-11-23 | 高仪股份公司 | The water meter with control device for detecting the method for the leakage in fluid pipeline and for implementing this method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1992005408A1 (en) | 1992-04-02 |
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