CN102718005A - Leakage detection method for detecting tank bottom leakage through oil gas in tank base of oil tank - Google Patents
Leakage detection method for detecting tank bottom leakage through oil gas in tank base of oil tank Download PDFInfo
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- CN102718005A CN102718005A CN2012102354393A CN201210235439A CN102718005A CN 102718005 A CN102718005 A CN 102718005A CN 2012102354393 A CN2012102354393 A CN 2012102354393A CN 201210235439 A CN201210235439 A CN 201210235439A CN 102718005 A CN102718005 A CN 102718005A
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Abstract
A leakage detection method for detecting tank bottom leakage through oil gas in the tank base of an oil tank comprises the following methods: marking more than 4 marks uniformly on the outer wall of the oil tank on the upper edge of the tank base; drilling detection holes leading to a sand cushion in all the marked positions with a manual drilling device, wherein each detection hole is 10 to 13 mm in diameter, 200 to 300 mm in depth, and the included angle Alpha between the axial line of each detection hole and the cement covered upper surface of the detection hole is 30 to 50 degrees; sealing a detection hole with a silica gel plug as long as the detection hole is drilled; measuring and recording the oil gas concentration of each detection hole and a tank chamber with an oil gas concentration detector at set intervals; and judging whether the bottom plate of the oil tank leaks or not according to the oil gas concentration value in each detection hole obtained in a period. As whether the bottom plate of the oil tank leaks or not is detected according to the method of drilling hole on the base of the tank to detect oil gas concentration in the tank base, impact on the normal production of the oil tank can be avoided, and harm to the oil tank base is eliminated.
Description
Technical field
The invention belongs to oil and gas detection and environmental protection technical field, particularly tank foundation has in the jar base of oil tank of sand bedding course the spy leakage method of seepage at the bottom of the oil and gas detection jar.
Background technology
Oil tank is as the visual plant in the petroleum industry, and its safe operation more and more receives extensive concern.Since oil tank bottom plate 1a to one section height of can body by tank base (with reference to Fig. 2; Tank base is made up of ring beam 2, sand bedding course 3, bitumen sand cushion 4 and cement clad can 5; Tank bottom from the bottom to top successively the heap sand bed course (300mm～600mm) and bitumen sand cushion (being no less than 100mm), oil tank bottom plate 1a is supported on the bitumen sand cushion, the cement clad can closely is covered with the slit between oil tank bottom plate and the ring beam; Because the oil tank bottom plate upper surface contacts with oil tank ponding or sediment, very easily corrosion; And lower surface is in the oxygen-abundant wet environment, very easily electrochemistry and chemical corrosion, so oil tank bottom plate is the position that oil tank is easy to generate hidden danger most, the factors such as tank base differential settlement, weld seam and steel defective that add very easily cause the oil tank bottom plate seepage.And oil tank bottom plate is to be buried in the tank base; Normally can't observe directly the state of oil tank bottom plate; Causing the oil tank bottom plate seepage is the oil tank hidden danger that is difficult for discovering most in service; This hidden danger not only can cause the waste and the economic loss of oil resources, but also can cause serious ecological environmental pollution and destruction, even also can cause fire explosion.Therefore oil tank bottom plate is carried out detecting in real time or regularly, in time finds seepage, removes a hidden danger, very important practical sense is arranged.
The leak detection technical point stopping production leak detection method of oil tank bottom plate and the leak detection method that do not stop production.Detections that stop production need soar oil plant, open and jar detect, influence the daily production of oil depot on the one hand, economy is impaired, time-consuming on the other hand.The detection that do not stop production promptly is to detect under the oil storage state, does not influence the ordinary production of oil depot, and main leak hunting method has: robot advances a jar checking system, acoustic emission testing, preset sensor and drill hole sampling monitoring etc.It is higher to safety, controllability, the sealing requirements of equipment that robot advances jar checking system, and it is high to detect cost, and reliability is lower, also is in the exploratory stage, is mainly used in surface storage tank and detects at present; Acoustic emission testing technology is a kind of Dynamic Non-Destruction Measurement technology; Have real-time, online characteristic, very economical, testing result is directly perceived, thorough; But field application is also at the early-stage; Because base plate corrosion or flaw indication identification difficulty add that field data is few, this technology is applied to the scene and is still waiting time; Preset sensor has lays optical fiber, two kinds of methods of leakage of oil induction cable at the bottom of jar; These two kinds of method leakage of oil induction cables and optical fiber generally can only use once just can not have been used again; Product price is also more expensive, and generally before building jar, just should lay completion, re-lays the requirement of explosion proof height after building jar; Difficulty is big, and cost is high.
Summary of the invention
To above-mentioned technical matters, the object of the present invention is to provide in a kind of jar base of oil tank the spy leakage method of seepage at the bottom of the oil and gas detection jar, whether the present invention exists seepage to survey with the mode of gas concentration in the borehole detection basis on tank base to oil tank bottom plate; Method of the present invention does not influence the ordinary production of oil tank, and to the tank foundation zero damage, needed instrument is buied easily; Good economy performance; Saving of work and time, applicability is wide, and testing result is reliable.
The technical scheme that realizes the object of the invention is following:
The spy leakage method of seepage at the bottom of the oil and gas detection jar in the jar base of oil tank may further comprise the steps:
Adopted such scheme, owing to be covered with bitumen sand cushion and the sand bedding course that supports oil tank bottom plate under the oil tank bottom plate successively, and bitumen sand cushion and sand bedding course all have hole; In case oil tank bottom plate generation seepage; Oil product can to around with bottom diffusion, generally speaking, leave the nearest sealing exploration hole of leakage of oil point and will be filled with oil gas earlier; This is to find seepage, judges the foundation of breakthrough approximate location.Because it is narrow and small that the jar space, chamber of oil tank is installed, in case air and outside air exchange difficulty in jar is the oil tank bottom plate seepage; Also can more or less there be oil gas the jar chamber; So can not adopt the boring method that can produce spark, the present invention adopts manual boring, guarantees the safety of holing; Boring at need can be in drill bit top-pour little water, with the wearing and tearing that alleviate drill bit, the resistance that reduces boring.Because the gas concentration exploration hole is deep into sand bedding course, and sand bedding course has a lot of holes, if oil tank has seepage, and also exploration hole not sealing immediately again, the oil gas of seepage can be scurried into a jar chamber along exploration hole, and the one, the influence judgement, the 2nd, very dangerous.After adopting the gas concentration detector to measure and write down the gas concentration of each exploration hole and jar chamber, the process whether oil tank bottom plate seepage takes place is:
Because of being covered with one deck tar sand insulating barrier in the tank foundation; The part tank foundation is also used at the bottom of the asphaltic seal jar and between the basis slit in addition; And volatile organic compound gas (VOC gas) can residually be arranged more or less in the pitch; So the gas concentration in the tank foundation is generally non-vanishing, and field experiment proof institute has or not the gas concentration difference the leakage of oil tank base in little, and can obtain an oil depot does not have the interior on average oil gas concentration value of leakage of oil tank base; When the gas concentration value of an exploration hole of certain oil tank or a plurality of exploration holes reaches this storehouse and do not have tens times of average oil gas concentration value in the leakage of oil tank base even hundreds of times, can judge this jar generation seepage.
Further; In step 5; If certain the exploration hole gas concentration that obtains exceeds other exploration hole when a lot, continue to drill through exploration hole in this hole and adjacent holes midway location, repeating step 3 to 4; Last according to the gas concentration value in each exploration hole that obtains in a period of time, judge the roughly position or the orientation at oil tank bottom plate breakthrough place.In this way, help increasing the particularity of detection.
Further, the hand drill aperture apparatus that adopts in the step 2 is ratchet bit brace or hand drill machine.Ratchet bit brace or hand drill machine help protecting the safety in the boring procedure.
Further, in the step 2, the diameter of exploration hole is 12mm, degree of depth 250mm.The aperture of exploration hole is chosen as 12mm, mainly based on the consideration of these several respects: 1. be the aperture too conference tank base is produced destroy or damage; 2. be the drill bit that hand drill aperture apparatus maximum can only be installed diameter 10mm, the aperture that the drill bit of diameter 10mm is accomplished is exactly 12mm; 3. the confined space that is the too little exploration hole in aperture is too little, and the PID gas concentration detector of pump suction type is easy to inhale flat and shuts down, thereby influences the measurement of gas concentration.4. be to be complementary with the size of silica gel plug, the lower end diameter of the silica gel plug that uses among the present invention is 12mm, and upper end diameter is 17mm, both made when boring drill bit rock severity, make that the aperture, upper end of exploration hole is bigger than normal, silica gel plug also can seal up exploration hole.The degree of depth of exploration hole is chosen as 250mm; Mainly based on the consideration of following aspect: 1. the bitumen sand cushion that is tank base is 100mm; If exploration hole leaning angle a is 45 °, the hole depth of passing bitumen sand cushion is 141.4mm, adds cement coating layer ranges in thickness 10mm; And the thickness of sand bedding course is 300mm at least, can guarantee that exploration hole arrives among the sand bedding course so exploration hole is chosen as 250mm; 2. the specification that is drill bit generally all is long 300mm, needs longer customizedly specially, considers and buys the convenient long drill bit of 300mm of just selecting; 3. be that the long drill bit of 300mm is exactly 250mm with the exploration hole hole depth that hand power tool drills through, this degree of depth also satisfies the requirement of actual measurement fully; 4. be if can conveniently buy longer drill bit, select 500mm or 600mm also better.
Further, the angle between the upper surface of the axis of exploration hole and cement clad can is 45o.Angle with 45o is holed to the sand bedding course direction, helps making the degree of depth in hole to reach 250mm, and also comparatively suitable for the selection of instrument.
Further, the surface of the silica gel plug in the step 3 scribbles aquaseal, and aquaseal is vacuum silicone grease, petroleum ointment etc.Silica gel plug itself has good flexibility, if can around stopper, smear a layer sealing agent, and the sealing effectiveness of exploration hole can be better.
Further, in the step 3, behind silica gel plug sealing exploration hole, and exploration hole carried out label.Help behind the label each exploration hole is carried out survey record and management, helpful to the judgement of the concrete breakthrough of oil tank.
The gas concentration detector is a PID gas concentration detector.The detection of seepage gas concentration not only requires high precision, high sensitivity in the tank foundation, and requires detecting instrument in the complicated gaseous environment of tank base, to have certain directive property.PID gas concentration detector (10.6eV photoionization detector) has response to the oil gas of seepage oil product volatilization in the tank base (in the VOC gas more than the butane); And other carbonic oxide that possibly exist, CO2, methane and aqueous vapor etc. in the tank base are not all had response; And PID gas concentration detector has better precision (being low to moderate 1PPM) and sensitivity than other detectors, so our preferred PID gas concentration detector is measured the instrument of gas concentration as us.Because the sample mode of PID gas concentration detector is a pump suction type, the sampling time can not be too short when measuring gas concentration, could finish sampling after waiting reading basicly stable, and the later stage that when the reading of gas concentration value, preferably is selected in the sampling time stablizes and locates.
In sum, whether the present invention exists seepage to survey with the mode of borehole detection gas concentration on tank base to oil tank bottom plate, and method of the present invention does not influence the ordinary production of oil tank; To the tank foundation zero damage; Needed instrument is buied easily, good economy performance, saving of work and time; Applicability is wide, and testing result is reliable.
Description of drawings
Fig. 1 is the birds-eye view of oil tank;
Fig. 2 is installed in the structural representation in the tank base for tank body;
Fig. 3 is equipped with the oil tank of sealing plug and the scheme drawing of tank base;
1 is oil tank, and 1a is an oil tank bottom plate, and 2 is ring beam, and 3 is sand bedding course, and 4 is bitumen sand cushion, and 5 is the cement clad can, and 6 is exploration hole, and 7 is silica gel plug.
The specific embodiment
See figures.1.and.2, the spy leakage method of seepage at the bottom of the oil and gas detection jar in the jar base of oil tank of the present invention may further comprise the steps:
After step 3, exploration hole of every completion drill through, rapidly with silica gel plug 7 these exploration holes of sealing; The surface of the silica gel plug in the step 3 scribbles aquaseal.Behind silica gel plug sealing exploration hole, and exploration hole carried out label.
Embodiment one
With a 1000m
3The earthing oil tank be example, the girth of at first measuring oil tank is 38.62 meters, begins by anticlockwise direction every at a distance from 9.66 meters position and mark 1#, 2#, 3# and 4# that confirm 1 spy small opening from oil-feed jar right side 200mm then.Adopt ratchet bit brace or hand drill machine to drill through exploration hole in each mark; Drill bit need penetrate in cement coating, ring beam, the arrival sand bedding course; The diameter of exploration hole is 12mm, degree of depth 250mm, and the angle between the upper surface of the axis of the exploration hole of moulding and cement clad can is 45o; Clog exploration hole with the surperficial silica gel plug that scribbles the vacuum silicone grease rapidly behind the intact hole, after 24 hours a gas concentration is measured in jar chamber and 1# to 4# exploration hole.If the gas concentration of 2# exploration hole is very high, then the midway location at 1# exploration hole and 2# exploration hole, 2# exploration hole and 3# exploration hole drills through 2 exploration holes again, is designated as 1.5# exploration hole and 2.5# exploration hole.If 1.5# exploration hole and 2.5# exploration hole gas concentration are all very high, explain that leak source is near the mid point of 2# exploration hole and jar end center O; If 1.5# exploration hole and 2.5# exploration hole gas concentration are no abnormal, explain that leak source is near the 2# exploration hole; If 1.5# exploration hole gas concentration is very high, and 2.5# exploration hole gas concentration is no abnormal, explains that leak source is near 1.5# exploration hole and 2# exploration hole connection lead.
Embodiment two
With a 5000m
3Oil tank be example; Can know that from the nameplate of oil tank its diameter is 24.8 meters, calculating its girth is 77.87 meters, according to the requirement that drills through 9 exploration holes; The 200mm beginning is along the every position at a distance from an exploration hole of 8.65 meters marks of oil tank outer wall boundary plank conter clockwise from the oil inlet right side; Hole one by one and seal exploration hole with silica gel plug with the ratchet bit brace tool, exploration hole need penetrate in cement coating, ring beam, the arrival sand bedding course, and the diameter of exploration hole is 12mm; Degree of depth 250mm; Angle between the upper surface of the axis of the exploration hole of moulding and cement clad can is 45o, has bored the silica gel plug of using the surface to scribble the vacuum silicone grease rapidly behind the exploration hole and has clogged exploration hole, treats to begin exploration hole is numbered 1#～9# by anticlockwise direction from oil inlet after all exploration holes are all accomplished.Jar chamber and 1# to 9# exploration hole are measured a gas concentration after 24 hours, compile a register and note information such as measurement date, gas concentration value.The judgment mode of pressing embodiment one is judged whether seepage of oil tank bottom plate, and the roughly position of seepage.
Claims (8)
1. the spy leakage method of seepage at the bottom of the interior oil and gas detection jar of jar base of oil tank is characterized in that, may further comprise the steps:
Step 1, along the oil tank outer wall at the even mark of mark more than 4 on the tank base;
Step 2, adopt the hand drill aperture apparatus, drill through the exploration hole of through sand bedding course in each mark, the diameter of exploration hole is 10-13mm, the degree of depth 200-300mm, and the angle between the upper surface of the axis of exploration hole and cement clad can is 30o to 50o;
Step 3, whenever drilled through an exploration hole after, rapidly with this exploration hole of silica gel plug sealing;
Step 4, is at set intervals measured and writes down the gas concentration of each exploration hole and jar chamber with the gas concentration detector;
Step 5, according to the gas concentration value that obtains in a period of time in each exploration hole, judge whether oil tank bottom plate seepage takes place.
2. the spy leakage method of seepage at the bottom of the oil and gas detection jar in the jar base of oil tank according to claim 1; It is characterized in that, in step 5, if certain the exploration hole gas concentration that obtains exceeds other exploration hole when a lot; Continue to drill through the development examination hole in this hole and adjacent holes midway location; Repeating step 3 to 4, last according to the gas concentration value in each exploration hole that obtains in a period of time, judge the roughly position or the orientation at oil tank bottom plate breakthrough place.
3. the spy leakage method of seepage at the bottom of the interior oil and gas detection jar of jar base of oil tank according to claim 1 and 2 is characterized in that the hand drill aperture apparatus that adopts in the step 2 is ratchet bit brace or hand drill machine.
4. the spy leakage method of seepage at the bottom of the interior oil and gas detection jar of jar base of oil tank according to claim 1 and 2 is characterized in that in the step 2, the diameter of exploration hole is 12mm, degree of depth 250mm.
5. the spy leakage method of seepage at the bottom of the interior oil and gas detection jar of jar base of oil tank according to claim 1 and 2 is characterized in that the angle between the upper surface of the axis of exploration hole and cement clad can is 45o.
6. the spy leakage method of seepage at the bottom of the interior oil and gas detection jar of jar base of oil tank according to claim 1 and 2 is characterized in that the surface of the silica gel plug in the step 3 scribbles aquaseal.
7. the spy method of leakageing of seepage at the bottom of the oil and gas detection jar in the jar base of oil tank according to claim 1 and 2 is characterized in that, in the step 3, seal exploration hole with silica gel plug after, and exploration hole carried out label.
8. the spy leakage method of seepage at the bottom of the interior oil and gas detection jar of jar base of oil tank according to claim 1 and 2 is characterized in that the gas concentration detector is a PID gas concentration detector.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102354393A CN102718005A (en) | 2012-07-09 | 2012-07-09 | Leakage detection method for detecting tank bottom leakage through oil gas in tank base of oil tank |
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| CN2012102354393A CN102718005A (en) | 2012-07-09 | 2012-07-09 | Leakage detection method for detecting tank bottom leakage through oil gas in tank base of oil tank |
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| CN102718005A true CN102718005A (en) | 2012-10-10 |
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| CN2012102354393A Pending CN102718005A (en) | 2012-07-09 | 2012-07-09 | Leakage detection method for detecting tank bottom leakage through oil gas in tank base of oil tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261043A (en) * | 2019-05-15 | 2019-09-20 | 中国石油天然气集团有限公司 | A kind of tank bottom oil leak monitoring method |
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| JPS5536734A (en) * | 1978-09-06 | 1980-03-14 | Toyo Kanetsu Kk | Method of inspecting leakage of bottom plate for cylindrical storage tank |
| JPS5935125A (en) * | 1982-08-24 | 1984-02-25 | Kobe Steel Ltd | Detection of gas leak from inner tank bottom plate for double shell flat bottom cylindrical tank |
| CN201190005Y (en) * | 2008-04-10 | 2009-02-04 | 浙江省特种设备检验研究院 | Vertical storage tank capable of real-time monitoring of tank bottom leakage |
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2012
- 2012-07-09 CN CN2012102354393A patent/CN102718005A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5536734A (en) * | 1978-09-06 | 1980-03-14 | Toyo Kanetsu Kk | Method of inspecting leakage of bottom plate for cylindrical storage tank |
| JPS5935125A (en) * | 1982-08-24 | 1984-02-25 | Kobe Steel Ltd | Detection of gas leak from inner tank bottom plate for double shell flat bottom cylindrical tank |
| CN201190005Y (en) * | 2008-04-10 | 2009-02-04 | 浙江省特种设备检验研究院 | Vertical storage tank capable of real-time monitoring of tank bottom leakage |
Non-Patent Citations (3)
| Title |
|---|
| 刘丽川等: "油罐底部基础探漏方法及试验研究", 《石油工程建设》, no. 5, 31 October 2011 (2011-10-31) * |
| 杨金林等: "油罐底板实时监漏方法比较", 《中国储运》, no. 5, 31 May 2012 (2012-05-31) * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261043A (en) * | 2019-05-15 | 2019-09-20 | 中国石油天然气集团有限公司 | A kind of tank bottom oil leak monitoring method |
| CN110261043B (en) * | 2019-05-15 | 2020-10-27 | 中国石油天然气集团有限公司 | Method for monitoring leakage of oil product at bottom of storage tank |
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Application publication date: 20121010 |