GB2493163A - A method of inhibiting microbially induced corrosion (MIC) - Google Patents
A method of inhibiting microbially induced corrosion (MIC) Download PDFInfo
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- GB2493163A GB2493163A GB1112812.1A GB201112812A GB2493163A GB 2493163 A GB2493163 A GB 2493163A GB 201112812 A GB201112812 A GB 201112812A GB 2493163 A GB2493163 A GB 2493163A
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- 230000007797 corrosion Effects 0.000 title claims abstract description 36
- 238000005260 corrosion Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 6
- 239000004599 antimicrobial Substances 0.000 claims abstract description 37
- 230000003204 osmotic effect Effects 0.000 claims abstract description 23
- 229910052709 silver Inorganic materials 0.000 claims abstract description 11
- 239000004332 silver Substances 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- 230000000813 microbial effect Effects 0.000 claims abstract description 8
- 239000011248 coating agent Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 5
- 238000007747 plating Methods 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000012530 fluid Substances 0.000 claims description 12
- 229940100890 silver compound Drugs 0.000 claims description 9
- 150000003379 silver compounds Chemical class 0.000 claims description 9
- 239000004519 grease Substances 0.000 claims description 6
- 150000003839 salts Chemical group 0.000 claims description 5
- 239000000243 solution Substances 0.000 abstract description 15
- 239000012267 brine Substances 0.000 abstract description 5
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 abstract description 5
- 150000001875 compounds Chemical class 0.000 abstract 1
- 241000894006 Bacteria Species 0.000 description 7
- 230000001580 bacterial effect Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 108091006629 SLC13A2 Proteins 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- YZCKVEUIGOORGS-UHFFFAOYSA-N Hydrogen atom Chemical compound [H] YZCKVEUIGOORGS-UHFFFAOYSA-N 0.000 description 1
- 108010020056 Hydrogenase Proteins 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 230000031018 biological processes and functions Effects 0.000 description 1
- 238000010349 cathodic reaction Methods 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 210000000805 cytoplasm Anatomy 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000001404 mediated effect Effects 0.000 description 1
- 230000028161 membrane depolarization Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
- C02F1/505—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment by oligodynamic treatment
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/16—Heavy metals; Compounds thereof
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F15/00—Other methods of preventing corrosion or incrustation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/16—Flanged joints characterised by the sealing means
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- General Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Plant Pathology (AREA)
- General Health & Medical Sciences (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Environmental Sciences (AREA)
- Dentistry (AREA)
- Health & Medical Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Agronomy & Crop Science (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
A method of inhibiting metal corrosion in anaerobic conditions, comprising identifying, in a system comprising devices (Figure 1) interconnected by a pipe network, regions (Figure 1A, 90) 99 with an anaerobic regime, and applying an antimicrobial agent to the identified regions (Figure 1A, 90) 99 to prevent anaerobic microbial corrosion. The antimicrobial agent may comprise silver or Ag compounds and can be contacted with gaskets at pipe junctions, or agents generating high osmotic pressures such as brine applied in standby devices (Figure 1). The silver can be applied as a strap or a paste (figure 2d, 114) to the pipe 95 or gasket 97, or as a coating or plating layer to the brace of gasket 97, 92. A controller (Figure 4, 120) may be provided to identify anaerobic regions (Figure 1A, 90) 99and fill such regions (Figure 1A, 90) 99 with a highly osmotic solution such as brine or sugar solution.
Description
PREVENTING ANAEROBIC CORROSION
BACKGROUND
1. TECHNICAL FIELD
[00011 The present invention relates to prevention of colTosion, and more particularly, to preventing anaerobic corrosion.
2. DISCUSSION OF THE RELATED ART [0002] Corrosion is a major problem in water treatment plants. leading to the progressive destruction of piping and equipment elements. Controfling corrosion is a key concern and an ongoing challenge in the water treatment industry.
p0003] Corrosion is a complex electrochemicai and biological process influenced by several factors. The present invention focuses on microbial corrosion, which is a bacterially mediated process of hydrogen sulfide gas formation and subsequently conversion to sulfuric acid that attacks concrete and steel. The hydrogen sulfide gas is oxidized in the presence of moisture to form sulfuric acid.
[0004] The mechanisms of metal corrosion in the presence of sulfate-reducing bacteria are complex. In an anaerobic environment, sulfate-reducing bacteria uses sulfate as the electron acceptor and reduces it to the sulfide. C.A.H. Von Wolzogen Kuhr and L.S. Van dci Vlugt. Water 18 (1934) 147. cited by X. Sheng et al., Corrosion Science 49 (2007) 2159-2 176 suggested the following reactions occurring: 4Fe 3 4Fe -4-8 (anodic reaction) 8H2O 3 8W + 80ff (water dissociation) 8W + 85 -3 8H(ds) (cathodic reaction) SO42 + 8H S + 4H20 (bacterial consumption) Fe2 + S2 -9 FeS (corrosion products) 4Fe + 5042+ + 4H-O 3 3Fe(OH)2 -i-FeS + 201-F (overall reaction) [0005] This overall process is described as cathodic depolarization. Sulfate-reducing bacteria consume the atomic hydrogen accumulated at the cathode by a hydrogenase enzyme.
[0006] Some researchers (B. Little, P. Wagner, F. Mansfeld, Electrochirn. Acta 37 (1992) 2185 and P.F. Sanders, WA. Hamilton, Biologically Induced Corrosion, NACE International. 1-louston, 1986, p. 47) have suggested that the corrosion rates increase due to the cathodic reduction of l-IS: H2S + 25 3 H + S2, and the anodic reaction is accelerated by the formation of iron sulfide: Fe + 3 FeS + 26.
[0007] Experimental studies have been conducted, in which a layer of biofilm, consisting of clusters of microbial cells and extracellular polymeric substance, was formed on a stainless steel surface in the absence of dissolved oxygen in the enriched artificial seawater medium. The analysis suggests that the sulfate-reducing bacteria play a direct role in the formation of pits on the surface of stainless steel 316.
[0008] Most air-tight areas such as flange connections, Victaulic couplings and other piping connections, which provide the anaerobic conditions necessary for bacterial growth, are prone to microbial corrosion. Bacteria are most aggressive in the gasket contact areas, as the anaerobic environment in these areas allows bacterial growth best.
BRIEF SUMMARY
[0009] One aspect of the invention provides a method of inhibiting metal corrosion in anaerobic conditions, comprising: identifying, in a system comprising devices interconnected by a pipe network, regions with anaerobic regime, by identifying regions which are neither aerated nor in contact with flowing fluid. and applying an antimicrobial agent to the identified regions to prevent anaerobic microbial corrosion in the identified regions.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] For a better understanding of embodiments of the invention and to show how the same may be carried into effect, reference will now be made, purely by way of example. to the accompanying drawings in which like numerals designate corresponding elements or sections throughout.
[0011] In the accompanying drawings: Figures 1A. 2A and 2B illustrate regions that aie neither aerated nor in contact with flowing fluid according to some embodiments of the invention, Figures 2C and 2D illustrate prevention means of anaerobic corrosion in regions that are neither aerated nor in contact with flowing fluid in pipe junction, according to some embodiments of the invention, Figures 3A-3D illustrate various pipe junctions exhibiting regions prone to anaerobic corrosion, according to some embodiments of the invention, Figure 4 is a high level schematic illustration of a water handing system, according to some embodiments of the invention, and Figure 5 is a high level schematic flowchart illustrating a method of inhibiting metal corrosion in anaerobic conditions, according to some embodiments of the invention.
[0012] The drawings together with the following detailed description make apparent to those skilled in the art how the invention may be embodied in practice.
DETA I LED DESCRWTION
[0013] With specific reference now to the drawings in detail, it is stressed that the particulars shown are by way of example and for purposes of illustrative discussion of the preferred embodiments of the present invention only, and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the invention. In this regard, no attempt is made to show structural details of the invention in more detail than is necessary for a fundamental understanding of the invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the invention may be embodied in practice.
[0014] Before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description or illustrated in the drawings. The invention is applicable to other embodiments or of being practiced or carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limiting.
[0015] The invention is aimed at preventing anaerobic corrosion in systems comprising devices interconnected by a pipe network with regions which are neither aerated nor in contact with flowing fluid.
[0016] Figures IA, 2A and 2B illustrate regions that are neither aerated nor in contact with flowing fluid according to some embodiments of the invention. Such are for example standby water treating devices, in which oxygen is consumed during the initial standby period, and then lack of aeration and of fluid movement cause anaerobic condition to prevail, followed by the development of anaerobic conosion.
Figure IA illustrates schematically an empty standby device, delimited by valves 91 (see also Figure 4). Figures 2A and 2B illustrate schematically a pipe junction 95 connecting two pipes (see Figures 3A-3D for more realistic examples). Figure 2B illustrates schematically anaerobic regions 99 in an interface 98 between a gasket 97 in pipe junction 95 and rigid sides 96 of pipe junction 95 which are tightened upon gasket 97. Region 99 between sides 96 and gasket 97 receives neither oxygen nor is flushed by fluid, and hence operated under anaerobic conditions which encourage anaerobic corrosion.
[0017] Figures 2C and 2D illustrate prevention means of anaerobic corrosion in regions that are neither aerated nor in contact with flowing fluid in pipe junction 95, according to some embodiments of the invention.
[0018] An antimicrobial agent against anaerobic bacteria that cause corrosion is selected and inserted into anaerobic regions 99.
[0019] For example, a silver or silver compound strap 112 may be placed between gasket 97 and a tight-fitting pipe parts 96 (Figure 2C). The edges of pipes 96, gasket 97 or brace 92 may be coated or plated with an antimicrobial agent such as silver or silver compounds to prevent anaerobic corrosion in anaerobic regions 99 (see Figures 3A-3D).
[0020] In another example, a paste 114 comprising a silver or silver compound may be spread on gasket 97 to contact junction sides 96.
[0021] In another embodiment, paste 114 may comprise an antimicrobial agent that applies a high osmotic pressure onto its surroundings, to inhibit bacterial growth by overcoming internal osmotic pressure of the bacteria.
[0022] The antimicrobial agent exerting a high osmotic pressure may be e.g. a salt solution, a sugar solution, or any other solution.
[0023] For example, paste 114 may comprise grease mixed with a salt to yield a high osmotic concentration of the grease.
[0024] In another example, the antimicrobial agent may be applied as foam, powder, liquid, or coating of the antimicrobial agent.
[0025] Figures 3A-3D illustrate various pipe junctions 95 exhibiting regions 99 prone to anaerobic corrosion, according to some embodiments of the invention.
[0026] Figure 3A illustrates a Victaulic connection between two pipes 96 possibly with a small space 93 inbetween, the connection comprising a brace 92 affixing pipes 96 over gasket 97. Anaerobic regions 99 are created at the contact of gasket 97 and pipes 96. and to some extent also at the contact of gasket 97 with brace 92, and anaerobic corrosion is formed at these anaerobic regions 99. Figure 3D is a perspective view of a similar connection, presenting brace 92 and gasket 97.
[0027] Figures 3B and 3C illustrate a connection of two pipes 96A, 96B. made of either similar materials (such as metal) or of different materials (e.g. metal and plastic). Pipes 96A, 96B are attached over gasket 97. forming corrosion prone anaerobic regions 99, and are fixated by a backing flange 96C. Figure 3B is a longitudinal cross section and Figure 3C is an enlargement of region 94.
[0028] Figure 3C illustrates limiters 108 nanged to further isolate anaerobic regions 99 to maintain the antimicrobial agent in junction regions 99 to which the antimicrobial agent is applied.
[0029] Figure 4 is a high level schematic illustration of a water handing system, according to some embodiments of the invention.
[0030] The system comprises operating devices 80, handling water (e.g. seawater) from a water source 81 and conducted to a water receiver 84. The system may comprise a desalination system, a water treatment system, a power plant, a sewage system etc. The system commonly incorporates some standby devices 90, such as standby pipe systems. pumps, turbines or reservoirs. These standby devices 90 may be switched on periodically to replace operating devices, e.g. due to malfunction, or during maintenance periods. Standby devices 90 are generally interconnected in the system by valves 91.
[0031] In embodiments of the invention, standby devices 90 are connected to a highly osmotic solution source 101 and to a water receiver 85 (that may be identical with water receiver 84. being e.g. the sea). A controller 120 may be operable to fill standby devices 90 with a highly concentrated osmotic solution from highly osmotic solution source 101, to prevent anaerobic corrosion in standby device 90 by applying a high osmotic pressure in standby device 90. A different antibacterial agent may also be inserted into standby device 90 to prevent corrosion. The highly osmotic solution must exert an osmotic pressure of at least 60 bar (provided, e.g. by a i0% NaC1 solution), at least 100 bar (provided, e.g. by a 15% NaCJ solution), 150 bar (provided, e.g. by a 20% NaCI solution) or even 300-400 bar in order to inhibit bacterial growth.
The highly osmotic s&ution may be a concentrated sugar solution.
[0032] Figure 5 is a high level schematic flowchart illustrating a method 200 of inhibiting metal corrosion in anaerobic conditions, according to some embodiments of the invention.
[0033] Method 200 comprises the following stages: identifying (stage 210). in a system comprising devices interconnected by a pipe network, regions with anaerobic regime (such as pipe parts tight-fitting gaskets, or standby, not aerated devices), by identifying regions which are neither aerated nor in contact with flowing fluid (stage 212), and applying (stage 220) an antimicrobial agent to the identified regions to prevent anaerobic microbial colTosion in the identified regions (stage 222).
[0034] The antimicrobial agent may be silver or a silver compound (stage 230) and be applied as a strap or a paste to the identified regions (stage 224). for example as an insert beneath a gasket (stage 232) or spread on the gasket (stage 234). I.e., method may comprise enclosing a silver or silver compound strap between part of a pipe network component and a tight fitting gasket, that delimit an identified region (stage 232), or applying a silver or silver compound paste onto gaskets (stage 234). lii other embodiments, the antimicrobial agent may be coated or plated upon pipe edges gaskets. or any other parts on which anaerobic corrosion develops. Method 200 may comprise applying the antimicrobia' agent as a coating or a plating to parts bordering the identified regions.
[0035] The antimicrobial agent may be a salt in a concentration that creates an osmotic pressure of at least 60 bar in the identified regions (stage 240). The salt may be applied as a paste (stage 224) or be mixed with grease used in the system (stage 226). The highly osmotic solution is selected to overcome the osmotic pressure inside the cytoplasm of anaerobic, corrosion generating bacteria may be bnne, or a concentrated sugar solution.
[00361 For example, method 200 may comprise filling standby water handing devices with brine in a concentration that creates an osmotic pressure of at least 60 bar in the device (stage 250) such as brine, e.g. filling standby water handing devices with an at least 10% NaC1 solution (stage 252). Method 200 may further comprise controlling tilling (stage 250) and emptying the standby device with brine (stage 254).
[0037] In an embodiment, the antimicrobial agent may be applied as a structural part of at least one pipe network component that delimits the identified regions (stage 225). In yet another embodiment, method 200 may comprise mixing the antimicrobial agent in grease applied to gaskets in the system (stage 226).
[00381 In embodiments, method 200 may comprise maintaining the antimicrobial agent in the identified regions (stage 227). e.g. by enclosing the identified regions with applied antimicrobial agent (stage 228) by installing a limiter arranged to maintain the antimicrobial agent in the identified regions to which the antimicrobial agent is applied (stage 229).
[0039] In the above description, an embodiment is an example or implementation of the invention. The various appearances of "one embodiment", "an embodiment" or "some embodiments' do not necessarily all refer to the same embodiments.
[0040] Although various features of the invention may be described in the context of a single embodiment, the features may also be provided separately or in any suitable combination. Conversely, although the invention may be described herein in the context of separate embodiments for clarity, the invention may also be imp'emented in a single embodiment.
[0041] Furthermore, it is to be understood that the invention can be carded out or practiced in various ways and that the invention can be implemented in embodiments other than the ones outlined in the descnption above.
[0042] The invention is not limited to those diagrams or to the corresponding descriptions. For example, flow' need not move through each illustrated box or state, or in exactly the same order as illustrated and described.
[0043] Meanings of technical and scientific terms used herein are to be commonly understood as by one of ordinary skill in the art to which the invention belongs, unless otherwise defined.
[0044] While the invention has been described with respect to a limited number of embodiments, these should not be construed as Umitations on the scope of the invention, but rather as exemplitications of some of the preferred embodiments. Other possible variations, modifications, and applications are also within the scope of the invention.
Claims (1)
- <claim-text>CLAIMSWhat is claimed is: I. A method of inhibiting metal corrosion in anaerobic conditions, comprising: identifying, in a system compnsing devices interconnected by a pipe network, regions with anaerobic regime, by identifying regions which are neither aerated nor in contact with flowing fluid, and applying an antimicrobial agent to the identified regions to prevent anaerobic microbial corrosion in the identified regions.</claim-text> <claim-text>2. The method of claim I. wherein the antimicrobial agent is silver or a silver compound.</claim-text> <claim-text>3. The method of claim 2, wherein the antimicrobial agent is applied as a strap or a paste.</claim-text> <claim-text>4. The method of claim 2, wherein the antimicrobial agent is applied as a coating or a plating to parts bordering the identified regions.</claim-text> <claim-text>5. The method of claim 2, wherein the antimicrobial agent is applied as a structural part of at least one pipe network component that delimits the identified regions.</claim-text> <claim-text>6. The method of claim 1, wherein the antimicrobial agent is a salt in a concentration that creates an osmotic pressure of at least 60 bar in the identified regions.</claim-text> <claim-text>7. The method of claim 6, wherein the antimicrobial agent is applied as a paste.</claim-text> <claim-text>S. The method of claim 6, wherein the antimicrobial agent is mixed with grease used in the system.</claim-text> <claim-text>9. The method of claim 1, wherein the identified regions are pipe parts tight-fitting gaskets.</claim-text> <claim-text>10. The method of claim 1. wherein the identified regions are standby water handing devices and wherein the antimicrobial agent is a highly osmotic solution in a concentration that creates an osmotic pressure of at least 60 bar in the identified regions.</claim-text> <claim-text>II. The method of claim 10, wherein the highly osmotic solution is an at least 10% NaCI solution.</claim-text> <claim-text>12. The method of claim 1, further comprising maintaining the antimicrobial agent in the identified regions.</claim-text> <claim-text>13. In a system comprising devices interconnected by a pipe network, a controller arranged to identify standby devices which are neither aerated nor in contact with flowing fluid, and fill the identified device with a highly osmotic solution in a concentration that creates an osmotic pressure of at least 60 bar in the identified device during a standby period.</claim-text> <claim-text>14. A pipe junction comprising a gasket and an antimicrobial agent selected to prevent anaerobic microbial corrosion in junction regions which are neither aerated nor in contact with flowing fluid.</claim-text> <claim-text>15. The pipe junction of claim 14, wherein the antimicrobM agent is applied as a silver or silver compound strap placed between the gasket and a tight-fitting pipe part.</claim-text> <claim-text>16. The pipe junction of claim 14, wherein the antimicrobial agent is applied as a coating or a plating to pipe ends or the gasket.</claim-text> <claim-text>17. The pipe junction of claim 14. wherein the antimicrobial agent is applied as a silver or silver compound paste onto the gasket.18. The pipe junction of claim 14, wherein the antimicrobial agent is applied as salt or sugar in grease applied to the gasket.1 9. The pipe junction of claim 14, further compnsing a limiter arranged to maintain the antimicrobial agent in the junction regions to which the antimicrobial agent is applied.</claim-text>
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1112812.1A GB2493163A (en) | 2011-07-26 | 2011-07-26 | A method of inhibiting microbially induced corrosion (MIC) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1112812.1A GB2493163A (en) | 2011-07-26 | 2011-07-26 | A method of inhibiting microbially induced corrosion (MIC) |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201112812D0 GB201112812D0 (en) | 2011-09-07 |
| GB2493163A true GB2493163A (en) | 2013-01-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1112812.1A Withdrawn GB2493163A (en) | 2011-07-26 | 2011-07-26 | A method of inhibiting microbially induced corrosion (MIC) |
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| Country | Link |
|---|---|
| GB (1) | GB2493163A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015018624A1 (en) * | 2013-08-09 | 2015-02-12 | Mærsk Olie Og Gas A/S | Inhibition of bacterial growth in pipelines |
| US20150275377A1 (en) * | 2014-03-27 | 2015-10-01 | Umm Al-Qura University | Nanoparticles of diquaternary schiff dibases as corrosion inhibitors for protecting steel against exposure to acidic fluids |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015018624A1 (en) * | 2013-08-09 | 2015-02-12 | Mærsk Olie Og Gas A/S | Inhibition of bacterial growth in pipelines |
| GB2534310A (en) * | 2013-08-09 | 2016-07-20 | Maersk Olie & Gas | Inhibition of bacterial growth in pipelines |
| DK178767B1 (en) * | 2013-08-09 | 2017-01-09 | Maersk Olie & Gas | Inhibition of bacterial growth in pipelines |
| US10344905B2 (en) | 2013-08-09 | 2019-07-09 | Total E&P Danmark A/S | Inhibition of bacterial growth in pipelines |
| GB2534310B (en) * | 2013-08-09 | 2020-04-22 | Total E&P Danmark As | Inhibition of bacterial growth in pipelines |
| US20150275377A1 (en) * | 2014-03-27 | 2015-10-01 | Umm Al-Qura University | Nanoparticles of diquaternary schiff dibases as corrosion inhibitors for protecting steel against exposure to acidic fluids |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201112812D0 (en) | 2011-09-07 |
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