Recommended
More Related Content
What's hot
What's hot (20)
Viewers also liked
Viewers also liked (17)
Similar to Cathodic protection fundamentals
Similar to Cathodic protection fundamentals (20)
Recently uploaded
Recently uploaded (20)
Cathodic protection fundamentals
- 1. CATHODIC PROTECTION DIVISION PREPARED BY : ABINASH PADHY NDTCCS
- 2. HISTORY OF NDTCCS IN CATHODIC PROTECTION • NDT Corrosion Control Services (NDTCCS) is a fully owned Saudi Company operating since 1975. NDT & CCS is one of the subsidiary company of well known Abdullah Al-Shuwayer group. Recently major share of NDT CCS has been acquired by Investcorp Bank, a leading financial GCC institution as part of strategic partnership between Abdullah Al-Shuwayer group and Investcorp • NDTCCS offers Cathodic Protection & NDT Services (Conventional & Advanced). • Our Cathodic Protection solutions can prevent corrosion in new structures and mitigate corrosion in existing structures for pipelines, refineries, above and underground storage tanks for every industrial market including offshore and marine, which includes Feasibility studies, site surveys, system design,intereference control systems, installation supervision, system commissioning and maintenance. We also supply wide range of CP materials such as Transformer rectifiers, ICCP Anodes & SACP anodes, Junction boxes, remote monitoring systems etc.
- 3. CATHODIC PROTECTION SERVICES CATHOSIC PROTECTION PRE-DESIGN SURVEY CATHODIC PROTECTION DESIGN ENGINEERING CATHODIC PROTECTION INSTALLATION FOR ONSHORE & OFFSHORE CATHODIC PROTECTION SYSTEM MONITORING AND MAINTENANCE CATHODIC PROTECTION MATERIAL SUPPLY CATHODIC PROTECTION SURVEYS
- 4. WHY CATHODIC PROTECTION Corrosion costs money. The only successful and cheapest way of saving deterioration of metals from corrosion. No coating is 100% perfect so cathodic protection used in conjunction with coatings to prevent metals from corrosion.
- 8. WHAT IS CATHODIC PROTECTION • Cathodic protection is a method for reducing the corrosion rate that can be applied to buried and submerged metallic structures • Making the structure cathode of a macroscopic corrosion cell by impressing current onto the structure from an external electrode called Anode.
- 9. HOW DOES IT WORK? • Cathodic protection current is impressed from an external cathodic protection anode through the electrolyte to the metal and reduces the potential difference between anodic and cathodic sites.
- 10. TYPES OF CATHODIC PROTECTION SYSTEMS CATHODIC PROTECTION ICCPSACP
- 11. SACRIFICIAL ANODE CATHODIC PROTECTION SYSTEM Test Station Structure Sacrificial Anode Flow of Current through Electrolyte
- 12. IMPRESS CURRENT CATHODIC PROTECTION SYSTEM
- 14. TRANSFORMER RECTIFIER • AC input Voltage, Single/ three phase, Frequency • DC maximum output Amp, Volt • Air Cooled: with sun-shade Oil Cooled: with thermometer • Location: according to area classification • Explosion proof (hazardous area) • Non-explosion proof (non- hazardous area
- 15. IMPRESS CURRENT ANODES COMMON ICCP ANODES Si-Fe MMO PLATINISED Si-Cr-Fe
- 16. MMO Coating Solid Titanium Core Titanium Substrate with a Copper Core Titanium Tubular Titanium Substrate Mesh Titanium Substrate Ribbon
- 18. IMPRESS CURRENT ANODES ARE SOMETIMES PACKAGED WITH THE CARBONACEOUS BACKFILL
- 20. ALUMINIUM ANODES ZINC ANODE MAGNESIUM ANODES BACKFILLED MAGNESIUL ANODES
- 22. INSTALLATION OF ICCP SYSTEM DEEP-WELL GB HORIZONTAL SHALLOW GB DITRIBUTED ANODES TYPES OF GROUND-BED
- 23. Non-metallic vent tube DEEP WEEL GROUNDBED One or more anodes installed vertically at a nominal depth of 15 meter (50 ft.) or more below the earth’s surface in a drilled hole for the purpose of supplying cathodic protection for an underground or submerged metallic structure.
- 24. CARBON BACKFILL TO MAINTAIN THE STABILITY OF THE DRILLED HOLE TO SERVE AS THE PRIMARY ANODIC REACTION SURFACE TO LOWER THE RESISTANCE TO EARTH OF THE SYSTEM
- 26. SHALLOW BED GROUND BED DEPTH- 3 TO 5 MTR
- 28. ANODE CONNECTION CABLES FROM ANODE GROUND BED MAIN CABLE TO +VE TERMINALOF TR POSITIVE JUNCTION BOX
- 29. CP OF ABOVE GROUND NEW TANKS
- 30. UNDERTANK WATERING SYSTEM ICCP Anode Grit Tank PVCWateringPipe To T/R Compacted Soil
- 31. DISTRIBUTED ANODE CP FOR TANKS
- 32. CP FOR WELL CASINGS
- 33. CP OF TANK INTERNALS Hanging ICCP anode
- 35. CP FOR OFFSHORE JACKETS
- 37. CATHODIC PROTECTION CRITERIA DescriptionPotential vs. Cu/CuSO4 mV Free Corrosion-700 Zone of Cathodic Protection-900 Intense Corrosion-600 Sever Over-Protection Problems-1200 Increased Over-Protection-1100 Some Over-Protection-1000 Some Protection-800
- 38. CATHODIC PROTECTION MONITORING Structure to electrolyte Potential measured with a Reference Electrode For soil – Copper Copper Sulfate For Sea Water – Silver Silver Chloride Electrode Placement- i. For Pipelines- on the line @ every 1-2 km ii. For Tanks – Under the tank
- 40. CSE Perforated PVC Pipe Filled with Water Tank Perforated PVC Pipe Installed for Reference Electrode Placement AVO
- 41. POTENTIAL MEASUREMENT OF OFFSHORE STRUCTURES Diver with Portable Reference Electrode
- 42. POTENTIAL MEASUREMENT OF WELL CASINGS TP-3TP-1 TP-2 well TP TP-3 TP-4 - 850 mV Min. protection level Un protected area Pipetosoilpotential -mV What about the potential at any point ? Buried pipeline ( 1.2 meter deep) Well casing 8000 feet deep The criterion most widely used on pipelines is based on measurements of potential differences between the pipeline and its environment . ie: more negative than ( - 850 mv) reference to Cu/Cu So4 cell
- 43. MONITORING TEST POSTS Flush – to – ground
- 44. CABLE CONNECTIONS Prior to welding : The coating must be removed at welding point ( 5x5 cm square ) Metal surface to be polished and cleaned
- 45. Pin Brazing Unit Pistol / Gun Pins & Ferrules Lug Grinder
- 46. ELECTRICAL ISOLATION Structure to be protected should be electrically isolated from the structures which do not require protection
- 47. Thank you