CN103469213B - Based on the storage tank outer bottom cathodic protection system of lamellar zinc alloy anode - Google Patents
Based on the storage tank outer bottom cathodic protection system of lamellar zinc alloy anode Download PDFInfo
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- CN103469213B CN103469213B CN201310387227.1A CN201310387227A CN103469213B CN 103469213 B CN103469213 B CN 103469213B CN 201310387227 A CN201310387227 A CN 201310387227A CN 103469213 B CN103469213 B CN 103469213B
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Abstract
The present invention relates to a kind of storage tank outer bottom cathodic protection system based on lamellar zinc alloy anode; this storage tank outer bottom cathodic protection system is arranged in the bottom of tank bottom plate (1); be followed successively by zinc alloy thin plate anode (2), tar sand (3) and basic layer of sand (4) from top to bottom, described storage tank shell steel plate (7) is connected by cable (6) with between zinc alloy thin plate anode (2).Advantage of the present invention is: occur slight crack or the infiltration of tank week for tar sand, and cause moisture water of condensation and underground water to rise and to infiltrate close to the Outer Bottom Plating of tank or rainwater, form the situation of corrosive environment, adopt sacrificial anode mode of the present invention, the protection time limit can reach 20 years.The all good water-proof effect of tank, the protection time limit of zine plate will extend.
Description
Technical field
The present invention relates to a kind of storage tank outer bottom cathodic protection system based on lamellar zinc alloy anode, belong to the corrosion and protection technical field of Oil & Gas Storage system.
Background technology
In Oil & Gas Storage system, great majority adopt steel storage tank to store crude oil at present.Steel storage tank is in operation, and must be subject to the corrosion of internal and external environment medium and affect work-ing life.Solve as how economic measure or alleviate the corrosion of storage tank, particularly important in tank design.Galvanic protection is exactly the technology preventing or suppress protected metal structures generation galvanic corrosion.
Outer bottom for storage tank corrodes, and mainly comes from the corrosion of soil media at the bottom of tank.Most tank pads is with layer of sand and tar sand main composition, also has part storage tank below layer of sand, add anti seepage membrane or antiseepage bed course.Storage tank is seated on tar sand face, due to the continuous change of liquid in tank and temperature, tar sand can be made to occur slight crack, causes underground water to rise close to the Outer Bottom Plating of tank, forms corrosive environment.
Chinese patent CN2753693 discloses a kind of crude oil storage tank bottom plate external cathode protecting device, adopts the mode being at least equiped with three anode bodies below bottom of storage tank, with the arrangement of radial radiation shape, symmetrical, be flatly installed in below bottom of storage tank.US Patent No. 05340455A discloses one and adopts mixed oxide (being called for short MMO) anode strap earlier, is distributed on below storage tank outer bottom with grid-like fashion.Also have domestic and international Patents then to adopt a kind of flexible anode, substitute MMO anode strap and be distributed on below storage tank outer bottom.The anode adopted in above-mentioned technology is the supplementary anode of impressed current.Auxiliary anode material mainly contains high silicon cast iron, graphite, iron and steel, platinum plating niobium, platinized titanium, magnet, flexible anode and mixed oxide etc.The layout of supplementary anode can select horizontal at the bottom of oblique angle type at the bottom of the other deep-wall type of tank week vertical type, tank, tank and tank.Burying underground of above-mentioned anode mainly adopts deep-wall type and shallow embedding formula.
United States Patent (USP) also disclosed the galvanic protection mode of sacrificial anode.Such as United States Patent (USP) 20090205951 discloses aluminium alloy or sacrificial zinc alloy anode protection, and anode adopts plate-like or netted, and anode is filled out construction materials contract parcel by overbasic.U s company also has outside at the bottom of employing Plattline type zinc band anode mode protective pot.Oil company of Saudi Arabia then adopts magnesium ribbon or zinc band to be distributed on outside at the bottom of tank and protects.
Entered development for many years, and all formulated relevant technical specifications and standard at present both at home and abroad, clear stipulaties has been made to storage tank bottom plate galvanic protection.The standard of domestic main reference has SY0007-99 " steel pipe and storage tank anticorrosion engineering standard ", SY/T0088-2006 " at the bottom of steel storage tank tank outer wall cathode protection technology standard ", API RP 651-97 " on the ground petroleum storage tank galvanic protection " and GB50393-2009 " steel petroleum storage tank anticorrosion engineering technical specifications ".
Generally speaking, be: lower to soil resistivity, tank diameter is less adopt sacrificial protection at present to the design philosophy of storage tank outer bottom galvanic protection; And higher for soil resistivity, that tank diameter is larger environment, then adopt impressed current protection.
Above-mentioned protected mode main purpose be allow protective current at the bottom of tank outside be uniformly distributed.But there is following problem:
For impressed-current protection system, protective current required in the initial operating stage several years is far smaller than design-calculated galvanic protection power supply capacity.Such as, protect outside at the bottom of the petroleum tank tank of 10 ten thousand steres, according to national and foreign standards algorithm, power supply generally needs 65V/65A or 50V/50A.But the measuring result in initial operating stage several years shows, practical power exports general even lower at 2A.Like this, the output capacity of Power Management Design is actually a kind of waste.In addition, export too low, under the relatively specified output fixing situation of power supply ripple coefficient, during power supply exports, Alternating Component increases, and galvanic protection constant-current mode operating performance is very poor.Even become the running status of cathode and anode intermitter change, add the danger of corrosion.
Sacrificial protection outside at the bottom of traditional tank, adopts strip or banded magnesium alloy or zinc alloy anode, is sometimes also equipped with and fills out construction materials contract, to promote anode dissolution.The storage tank that, diameter higher for soil resistivity is larger, the protective current fan-out capability of sacrificial anode is limited.In order to make protective current be uniformly distributed, adopt traditional sacrificial anode mode, sacrificial anode spacing will be caused very little, and usage quantity is huge, greatly increases initial investment.In fact, at present there is concrete pedestal below a lot of storage tank bottom, also have tar sand and anti seepage membrane between at the bottom of pedestal and tank, which in turns increases the resistivity of lateral media at the bottom of tank, adopt traditional sacrificial anode mode in fact infeasible.
Summary of the invention
For overcoming the defect of prior art; the invention provides and be a kind ofly not suitable for solve traditional sacrificial anodes mode the storage tank protection problem that resistivity is high, diameter is large; also in order to avoid impressed current system initial operating stage outward current is too small, power supply capacity waste, the problem that operation fluctuation relative value is larger.The present invention adopts thin board type sacrificial anode Systematical control tank bottom plate to corrode; Consider the corrosion inducement outside current storage tank, stem from periphery waterproof failure at the bottom of tank, moisture and erosion carbon dioxide infiltrate.Therefore, the corrosion of Outer Bottom Plating at the bottom of tank is usually from outer circumferential sides.So the present invention carries out emphasis galvanic protection to storage tank outer bottom circumference, to tank Outer Bottom Plating region intermediate, reduce zinc anode consumption or do not do galvanic protection.
Technical scheme of the present invention is: a kind of storage tank outer bottom cathodic protection system based on lamellar zinc alloy anode; this storage tank outer bottom cathodic protection system is arranged in the bottom of tank bottom plate (1); be followed successively by zinc alloy thin plate anode (2), tar sand (3) and basic layer of sand (4) from top to bottom, described storage tank shell steel plate (7) is connected by cable (6) with between zinc alloy thin plate anode (2).
The upper surface of described zinc alloy thin plate anode (2) is as sacrificial anode working-surface, between tank bottom plate (1) and zinc alloy thin plate anode (2), add one deck fill out construction materials contract, to promote that zinc alloy thin plate anode (2) upper surface dissolves and current dissipation; Described zinc alloy thin plate anode (2) and the contact surface of tar sand (3) are coated with coating.
Described storage tank shell steel plate (7) is welded with cable stiffening plate (9), described zinc alloy thin plate anode (2) is installed with cable stiffening plate (13), and the two ends of described cable (6) are fixed on the cable stiffening plate (9) of storage tank shell steel plate (7) and the cable stiffening plate (13) of zinc alloy thin plate anode (2) respectively by fastening piece (11).
Described zinc alloy thin plate anode (2) comprises several unit thin plate, described several unit thin plates circularize distribution along the circumferential direction of tank bottom plate (1), the edge section of two adjacent unit thin plates stacks successively, and is linked together by two adjacent unit thin plates by rivet.
Described unit thin plate adopts Zn-Al-Cd alloy to make, and the weight percent of each component is Al:0.1-0.5%; Cd:0.025-0.07%; Cu:0.005% Max.; Fe:0.005% Max.; Pb:0.006% Max.; Surplus is Zn.
Advantage of the present invention is: occur slight crack or the infiltration of tank week for tar sand, and cause moisture water of condensation and underground water to rise and to infiltrate close to the Outer Bottom Plating of tank or rainwater, form the situation of corrosive environment, adopt sacrificial anode mode of the present invention, the protection time limit can reach 20 years.The all good water-proof effect of tank, the protection time limit of zine plate will extend.
Accompanying drawing explanation
Fig. 1 is agent structure schematic diagram of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the A-A sectional view of Fig. 2;
Fig. 4 is the structural representation that unit thin plate connects.
Embodiment
See Fig. 1 to Fig. 4; the present invention relates to a kind of storage tank outer bottom cathodic protection system based on lamellar zinc alloy anode; this storage tank outer bottom cathodic protection system is arranged in the bottom of tank bottom plate (1); be followed successively by zinc alloy thin plate anode (2), tar sand (3) and basic layer of sand (4) from top to bottom, described storage tank shell steel plate (7) is connected by cable (6) with between zinc alloy thin plate anode (2).
The upper surface of described zinc alloy thin plate anode 2 is as sacrificial anode working-surface, between tank bottom plate 1 and zinc alloy thin plate anode 2, add one deck fill out construction materials contract, this is filled out construction materials contract and is made up of 50% terra alba, 45% wilkinite or diatomite and 5% sodium sulfate, except the formation of playing limiting surface film and the effect preventing electric osmose from dewatering; The output of uniform current can also be guaranteed, make the consumption of homogenize material, the realization of this function is mainly because fill out in construction materials contract containing gypsum component, and wilkinite or diatomite can keep moisture, add sodium sulfate and can reduce resistivity, described zinc alloy thin plate anode (2) and the contact surface of tar sand (3) are coated with coating, such as epoxide coal bituminous coating.
Described storage tank shell steel plate 7 is welded with cable stiffening plate 9, described zinc alloy thin plate anode 2 is installed with cable stiffening plate 13, the two ends of described cable 6 are respectively by fastening piece 11(such as screw bolt and nut) be fixed on the cable stiffening plate 9 of storage tank shell steel plate 7 and the cable stiffening plate 13 of zinc alloy thin plate anode 2, the length of the weld seam that cable stiffening plate 9 is formed on storage tank shell steel plate 7 is at least 80 millimeters, to ensure that stiffening plate is firmly welded on storage tank shell steel plate, cable 6 and cable stiffening plate 9, and between cable stiffening plate 13, form galvanic protection energising point 5, cable stiffening plate 9, cable stiffening plate 13 adopts stainless steel, and all adopt coating protection, this coating is identical with the coating of storage tank outer wall, technical requirements should meet GB 50393-2008 " steel petroleum storage tank anticorrosion engineering technical specifications ".
Described zinc alloy thin plate anode 2 comprises several unit thin plate 14, and described several unit thin plates 14 circularize distribution along the circumferential direction of tank bottom plate 1, to make tank bottom plate 1 region intermediate reduce zinc anode consumption or not do galvanic protection; The edge section of two adjacent unit thin plates stacks successively, and by rivet 12, two adjacent unit thin plates 14 are linked together, described cable stiffening plate 13 fixedly mounts on a unit thin plate 14 wherein, the angle that adjacent two module unit thin plates 14 stack and area depend on tank diameter, storage tank radius is large, unit thin plate 14 overlapping angle is less, and utilization ratio is just high, and vice versa.
Described unit gauge of sheet is generally 1.2 ~ 3 millimeters, and adopt Zn-Al-Cd alloy to make, the weight percent of each component is Al:0.1-0.5%; Cd:0.025-0.07%; Cu :≤0.005%; Fe :≤0.005%; Pb :≤0.006%; Surplus is Zn.
Claims (4)
1. the storage tank outer bottom cathodic protection system based on lamellar zinc alloy anode, it is characterized in that: this storage tank outer bottom cathodic protection system is arranged in the bottom of tank bottom plate (1), be followed successively by zinc alloy thin plate anode (2), tar sand (3) and basic layer of sand (4) from top to bottom, described storage tank shell steel plate (7) is connected by cable (6) with between zinc alloy thin plate anode (2); Described zinc alloy thin plate anode (2) comprises several unit thin plate, described several unit thin plates circularize distribution along the circumferential direction of tank bottom plate (1), the edge section of two adjacent unit thin plates stacks successively, and is linked together by two adjacent unit thin plates by rivet.
2. the storage tank outer bottom cathodic protection system based on lamellar zinc alloy anode according to claim 1, it is characterized in that: the upper surface of described zinc alloy thin plate anode (2) is as sacrificial anode working-surface, between tank bottom plate (1) and zinc alloy thin plate anode (2), add one deck fill out construction materials contract, to promote that zinc alloy thin plate anode (2) upper surface dissolves and current dissipation; Described zinc alloy thin plate anode (2) and the contact surface of tar sand (3) are coated with coating.
3. the storage tank outer bottom cathodic protection system based on lamellar zinc alloy anode according to claim 1; it is characterized in that: described storage tank shell steel plate (7) is welded with cable stiffening plate (9); described zinc alloy thin plate anode (2) is installed with cable stiffening plate (13), and the two ends of described cable (6) are fixed on the cable stiffening plate (9) of storage tank shell steel plate (7) and the cable stiffening plate (13) of zinc alloy thin plate anode (2) respectively by fastening piece (11).
4. the storage tank outer bottom cathodic protection system based on lamellar zinc alloy anode according to claim 1, is characterized in that: described unit thin plate adopts Zn-Al-Cd alloy to make, and the weight percent of each component is Al:0.1-0.5%; Cd:0.025-0.07%; Cu:0.005% Max.; Fe:0.005% Max.; Pb:0.006% Max.; Surplus is Zn.
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| CN201310387227.1A CN103469213B (en) | 2013-08-30 | 2013-08-30 | Based on the storage tank outer bottom cathodic protection system of lamellar zinc alloy anode |
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| CN201310387227.1A CN103469213B (en) | 2013-08-30 | 2013-08-30 | Based on the storage tank outer bottom cathodic protection system of lamellar zinc alloy anode |
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| CN103469213B true CN103469213B (en) | 2015-08-05 |
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| CN104630785A (en) * | 2015-01-16 | 2015-05-20 | 北京碧海舟腐蚀防护工业股份有限公司 | Mounting method for material storage tank system and material storage tank system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0633276A (en) * | 1992-07-20 | 1994-02-08 | Nippon Steel Corp | Method for preventing corrosion in bottom plate of tank |
| CN2362869Y (en) * | 1998-12-30 | 2000-02-09 | 中国科学院上海冶金研究所 | Combined protective coating for sacrificial anode on outside of bottom board of iron and steel storage tank |
| CN2753693Y (en) * | 2004-12-31 | 2006-01-25 | 覃红权 | Crude oil storage tank bottom plate external cathode protecting device |
| US7964067B2 (en) * | 2008-02-18 | 2011-06-21 | Miki Funahashi | Corrosion control of bottom plates in above-ground storage tanks |
| CN202543331U (en) * | 2012-04-05 | 2012-11-21 | 西安格林石油科技有限公司 | Corrosion preventing device for storage tank |
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2013
- 2013-08-30 CN CN201310387227.1A patent/CN103469213B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0633276A (en) * | 1992-07-20 | 1994-02-08 | Nippon Steel Corp | Method for preventing corrosion in bottom plate of tank |
| CN2362869Y (en) * | 1998-12-30 | 2000-02-09 | 中国科学院上海冶金研究所 | Combined protective coating for sacrificial anode on outside of bottom board of iron and steel storage tank |
| CN2753693Y (en) * | 2004-12-31 | 2006-01-25 | 覃红权 | Crude oil storage tank bottom plate external cathode protecting device |
| US7964067B2 (en) * | 2008-02-18 | 2011-06-21 | Miki Funahashi | Corrosion control of bottom plates in above-ground storage tanks |
| CN202543331U (en) * | 2012-04-05 | 2012-11-21 | 西安格林石油科技有限公司 | Corrosion preventing device for storage tank |
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