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  • CHATHODIC PROTECTION MANUFACTURE (18)

CHATHODIC PROTECTION MANUFACTURE (18)

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01 / 12 / 2019
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Detail CHATHODIC PROTECTION MANUFACTURE (18)

AGRO INDUSTRI SURABAYA PHONE. 031 3989496 FAX. 031 3980197 EMAIL INDUSTRI2034@ GMAIL.COM AGRO INDUSTRI SURABAYA IS ACTIVE IN THE DESIGN DELIVERY INSTALLATION MONITORING AND MAINTENANCE OF CP SYSTEMS FOR A WIDE RANGE OF APPLICATIONS AS EXTERNAL CP OF BURIED PIPELINES EXTERNAL CP OF BURIED TANKS INTERNAL CP OF TANKS CP APPLICATIONS OFFSHORE Kami memproduksi Katode dan Anode sesuai spesifikasi dan aplikasi yang anda Butuhkan. _ _ _ _ _ _ _ _ _ _ _ WHAT IS IT AND HOW DOES IT WORK HOW DOES STEEL CORRODE IN SEAWATER TO UNDERSTAND CATHODIC PROTECTION ONE MUST FIRST UNDERSTAND THE CORROSION MECHANISM. FOR CORROSION TO OCCUR THREE CONDITIONS MUST BE PRESENT. 1. TWO DISSIMILAR METALS 2. AN ELECTROLYTE WATER WITH ANY TYPE OF SALT OR SALTS DISSOLVED IN IT 3. A METAL CONDUCTING PATH BETWEEN THE DISSIMILAR METALS THE TWO DISSIMILAR METALS MAY BE TOTALLY DIFFERENT ALLOYS SUCH AS STEEL AND ALUMINUM BUT ARE MORE USUALLY MICROSCOPIC OR MACROSCOPIC METALLURGICAL DIFFERENCES ON THE SURFACE OF A SINGLE PIECE OF STEEL. IF THE ABOVE CONDITIONS EXIST AT THE MORE ACTIVE METAL SURFACE IN THIS CASE WE WILL CONSIDER FREELY CORRODING STEEL WHICH IS NON UNIFORM THE FOLLOWING REACTION TAKES PLACE AT THE MORE ACTIVE SITES 2FE 2FE 4E 2 IRON IONS PLUS 4 FREE ELECTRONS THE FREE ELECTRONS TRAVEL THROUGH THE METAL PATH TO THE LESS ACTIVE SITES WHERE THE FOLLOWING REACTION TAKES PLACE O2 4E 2 H20 4 OH OXYGEN GAS CONVERTED TO OXYGEN ION BY COMBINING WITH THE FOUR FREE ELECTRONS WHICH COMBINES WITH WATER TO FORM HYDROXYL IONS RE COMBINATIONS OF THESE IONS AT THE ACTIVE SURFACE PRODUCE THE FOLLOWING REACTION WHICH YIELDS THE IRON CORROSION PRODUCT FERROUS HYDROXIDE. 2FE O2 2H2O 2FE OH 2 IRON COMBINING WITH OXYGEN AND WATER TO FORM FERROUS HYDROXIDE THIS REACTION IS MORE COMMONLY EXPLAINED AS CURRENT FLOW THROUGH THE WATER FROM THE ANODE MORE ACTIVE SITE TO THE CATHODE LESS ACTIVE SITE . HOW DOES CATHODIC PROTECTION STOP CORROSION CATHODIC PROTECTION PREVENTS CORROSION BY CONVERTING ALL OF THE ANODIC ACTIVE SITES ON THE METAL SURFACE TO CATHODIC PASSIVE SITES BY SUPPLYING ELECTRICAL CURRENT OR FREE ELECTRONS FROM AN ALTERNATE SOURCE. USUALLY THIS TAKES THE FORM OF GALVANIC ANODES WHICH ARE MORE ACTIVE THAN STEEL. THIS PRACTICE IS ALSO REFERRED TO AS A SACRIFICIAL SYSTEM SINCE THE GALVANIC ANODES SACRIFICE THEMSELVES TO PROTECT THE STRUCTURAL STEEL OR PIPELINE FROM CORROSION. IN THE CASE OF ALUMINUM ANODES THE REACTION AT THE ALUMINUM SURFACE IS 4AL 4AL 12 E 4 ALUMINUM IONS PLUS 12 FREE ELECTRONS AND AT THE STEEL SURFACE 3O2 12E 6H20 12OH OXYGEN GAS CONVERTED TO OXYGEN IONS WHICH COMBINE WITH WATER TO FORM HYDROXYL IONS AS LONG AS THE CURRENT FREE ELECTRONS IS ARRIVING AT THE CATHODE STEEL FASTER THAN OXYGEN IS ARRIVING NO CORROSION OCCURS. BASIC CONSIDERATIONS WHEN DESIGNING SACRIFICIAL ANODE SYSTEMS THE ELECTRICAL CURRENT WHICH AN ANODE DISCHARGES IS CONTROLLED BY OHM S LAW THAT IS I E R WHERE I CURRENT FLOW IN AMPS E DIFFERENCE IN POTENTIAL BETWEEN THE ANODE AND CATHODE IN VOLTS R TOTAL CIRCUIT RESISTANCE IN OHMS INITIALLY CURRENT WILL BE HIGH BECAUSE THE DIFFERENCE IN POTENTIAL BETWEEN THE ANODE AND CATHODE ARE HIGH BUT AS THE POTENTIAL DIFFERENCE DECREASES DUE TO THE EFFECT OF THE CURRENT FLOW ONTO THE CATHODE CURRENT GRADUALLY DECREASES DUE TO THE POLARIZATION OF THE CATHODE. THE CIRCUIT RESISTANCE INCLUDES BOTH THE WATER PATH AND THE METAL PATH INCLUDING ANY CABLE IN THE CIRCUIT. THE DOMINANT VALUE HERE IS THE RESISTANCE OF THE ANODE TO THE SEAWATER. FOR MOST APPLICATIONS THE METAL RESISTANCE IS SO SMALL COMPARED TO THE WATER RESISTANCE THAT IT CAN BE IGNORED. NOT TRUE FOR SLEDS OR LONG PIPELINES PROTECTED FROM BOTH ENDS . IN GENERAL LONG THIN ANODES HAVE LOWER RESISTANCE THAN SHORT FAT ANODES. THEY WILL DISCHARGE MORE CURRENT BUT WILL NOT LAST AS LONG. THEREFORE A CATHODIC PROTECTION DESIGNER MUST SIZE THE ANODES SO THAT THEY HAVE THE RIGHT SHAPE AND SURFACE AREA TO DISCHARGE ENOUGH CURRENT TO PROTECT THE STRUCTURE AND ENOUGH WEIGHT TO LAST THE DESIRED LIFETIME WHEN DISCHARGING THIS CURRENT. AS A GENERAL RULE OF THUMB LENGTH OF THE ANODE DETERMINES HOW MUCH CURRENT THE ANODE CAN PRODUCE AND CONSEQUENTLY HOW MANY SQUARE FEET OF STEEL CAN BE PROTECTED. CROSS SECTION WEIGHT DETERMINES HOW LONG THE ANODE CAN SUSTAIN THIS LEVEL OF PROTECTION. IMPRESSED CURRENT CATHODIC PROTECTION SYSTEMS DUE TO THE HIGH CURRENTS INVOLVED IN MANY SEAWATER SYSTEMS IT IS NOT UNCOMMON TO USE IMPRESSED CURRENT SYSTEMS. IMPRESSED CURRENT SYSTEMS USE ANODES OF A TYPE THAT ARE NOT EASILY DISSOLVED INTO METALLIC IONS BUT RATHER SUSTAIN AN ALTERNATIVE REACTION OXIDIZATION OF THE DISSOLVED CHLORIDE IONS. 2CL CL2 2E POWER IS SUPPLIED BY AN EXTERNAL DC POWER UNIT. FIGURE 2 IMPRESSED CURRENT CATHODIC PROTECTION SYSTEM HOW DO WE KNOW WHEN WE HAVE ENOUGH CATHODIC PROTECTION WE KNOW WHETHER OR NOT WE HAVE ENOUGH CURRENT BY MEASURING THE POTENTIAL OF THE STEEL AGAINST A STANDARD REFERENCE ELECTRODE USUALLY SILVER SILVER CHLORIDE AG AGCL SW. BUT SOMETIMES ZINC ZN SW. . CURRENT FLOW ONTO ANY METAL SHIFTS ITS NORMAL POTENTIAL IN THE NEGATIVE DIRECTION. HISTORY HAS SHOWN THAT IF STEEL RECEIVES ENOUGH CURRENT TO SHIFT THE POTENTIAL TO 0.800 V VS. SILVER SILVER CHLORIDE THE CORROSION IS ESSENTIALLY STOPPED. DUE TO THE NATURE OF THE FILMS FORMED THE MINIMUM 0.800 V POTENTIAL IS RARELY THE OPTIMUM POTENTIAL AND DESIGNERS TRY TO ACHIEVE A POTENTIAL BETWEEN 0.950 V AND 1.000 V VS. AG AGCL SW. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ZAP MITZUI S3 S4 S6 S8. ZAP B TYPE AVAILABLE UPON REQUEST. CATHODIC PROTECTION FOR THE OIL GAS WATER POWER INDUSTRIES ZINC ALUMINUM ANODES ALUMINIUM ALLOY SACRIFICIAL ANODES HAVE AN ELECTRO CHEMICAL PROPERTY THAT MAKES THEM SUITABLE FOR USE IN CATHODIC PROTECTION SYSTEMS. AN OXIDE FILM CAN DEVELOP ON THE SURFACE OF THE ALUMINIUM THAT MAKES THE MATERIAL PASSIVE. ALUMINIUM ALLOYS HAVE BEEN DEVELOPED SO THAT ONE OR MORE OF THE ALLOYS DISRUPTS THE PROTECTIVE OXIDE LAYER AND MAKES THE ALLOY ANODIC TO PROMOTE EVEN CORROSION WHEN THE ANODE IS PLACED IN THE ELECTROLYTE. ZINC HAS BEEN USED AS A SACRIFICIAL ANODE MATERIAL IN SEAWATER SINCE 1824 BUT MODERN ZINC ANODES USED FOR CATHODIC PROTECTION ARE CAST FROM HIGH PURITY ZINC 99.9 ALLOYED WITH ALUMINIUM AND CADMIUM WITH LIMITATIONS ON THE LEVELS OF LEAD IRON AND COPPER. TRANSFORMER RECTIFIERS A VARIED RANGE OF HIGH QUALITY TRANSFORMER RECTIFIERS ARE DESIGNED AND MANUFACTURED TO MEET THE MARKET REQUIREMENT FOR ALL LAND AND MARINE STRUCTURES NECESSITATING AN IMPRESSED CURRENT CATHODIC PROTECTION ICCP SYSTEM OR A MARINE GROWTH ANTI FOULING SYSTEM. ANODE CATHODE BOND BOXES A WIDE RANGE OF CUSTOM MADE JUNCTION BOXES FOR THE CONTROL AND MEASUREMENT REQUIRED FOR YOUR PROTECTION SYSTEM. ALL ITEMS ARE MANUFACTURED AND TESTED USING THE HIGHEST QUALITY MATERIALS. EEXD AND EEXE RATED PRODUCTS ARE ALSO AVAILABLE FOR HAZARDOUS AREA LOCATIONS. REFERENCE ELECTRODES COUPONS WE SUPPLY REFERENCE ELECTRODES FROM THE MOST RELIABLE NAMES IN THE INDUSTRY INCLUDING MC MILLER BORIN GMC AND EDI. WE CAN ADVISE THE CORRECT CHOICE OF PRODUCT FOR YOUR SPECIFIC APPLICATION. MIXED METAL OXIDE MIXED METAL METAL OXIDE MMO IMPRESSED CURRENT ANODES SUPPLIED BY CATHODIC PROTECTION CO LTD HAVE BEEN DESIGNED FOR THEIR USE IN SPECIFIC CATHODIC PROTECTION APPLICATIONS. THE MMO ANODE SUBSTRATE USUALLY TITANIUM IS ACTIVATED BY THE METAL OXIDE COATING AND IS SUITABLE FOR USE IN SOILS CARBONACEOUS BACKFILL FRESH AND BRACKISH WATER SEAWATER AND CONCRETE. SILICON IRON ANODES ARE PROBABLY THE MOST COMMONLY USED ANODES IN CATHODIC PROTECTION GROUND BED CONSTRUCTION AND THE HIGH CORROSION RESISTANCE OF SILICON IRON AND SILICON CHROMIUM IRON ALLOYS MEANS THAT CATHODIC PROTECTION SYSTEM LIFETIME IN EXCESS OF 20 YEARS MAY BE ACHIEVED. THE ANODES CAN BE USED IN MANY DIFFERENT ENVIRONMENTS EG ONSHORE SEAWATER AND FRESHWATER APPLICATIONS. SILICON IRON ANODES ARE FOR USE IN NEUTRAL SOILS AND FRESHWATER ENVIRONMENTS. SILICON CHROMIUM IRON ANODES ARE FOR USE IN AGGRESSIVE ACIDIC OR ALKALINE SOILS AND SEAWATER ENVIRONMENTS. MAGNESIUM ANODES WE SUPPLY THE FINEST QUALITY MAGNESIUM ANODES THAT HAVE BEEN SPECIFICALLY DEVELOPED FOR THE CATHODIC PROTECTION MARKET. TYPICAL APPLICATIONS FOR MAGNESIUM ANODES INCLUDE TEMPORARY PROTECTION OF PIPELINES TEMPORARY PROTECTION OF TANK BOTTOMS PERMANENT PROTECTION OF WELL COATED PIPELINES IN LOW RESITIVITY SOIL PERMANENT PROTECTION OF BURIED VESSELS INTERNAL PROTECTION OF WATER TANKS CARBONACEOUS BACKFILL METALLURGICAL AND CALCINED PETROLEUM BACKFILL FOR HORIZONTAL AND DEEP ANODE GOUNDBEDS. CHEMICAL COMPOSITIONS AND DENSITIES AVAILABLE FOR YOUR SPECIFIC APPLICATIONS. PHONE. 031 3989496 082129847777 082129846666 FAX. 031 3980197 EMAIL INDUSTRI2034@ GMAIL.COM update on : 7 Maret 2016

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