welding and welding procedures , cross country pipelines , downhill technique ,off shore structures techniques ,plant shutdown and maintenance ,system documentation safety,system documentation quality,inspection surveillance, powerplant procedures , corrosion and prevention techniques , protective coating ,heat treatment , continuos improvement-kaizen,planning and scheduling , failure analysis , audit-system verfication
APPLICATION & PROCEDURES - PROTECTIVE COATING SYSTEM:

BEING A CONSULTANT FOR SSPC - PITTSBURGH - U.S.A FOR PROTECTIVE COATINGS SYSTEMS - (REFER - www.paintsquare.com)

VCS CAN OFFER PROPER GUIDANCE FOR CORRECT APPLICATION PROCEDURES BASED ON THE ENVIRONMENTAL CONDITIONS.

A ) PAINTING

B ) ELECTRO PLATING / ANODIZING / GALVANIZING

C ) CATHODIC PROTECTION

D ) COATING & WRAPPING

E ) REFRACTORY LINING


F ) RUBBER LINING ETC..


VCS HAVE ALREADY GIVEN SOLUTIONS TO MANY INDUSTRIAL PAINTING SYSTEMS AND AN APPROACH TO SOLVE ANY PROBLEM RAISING OUT OF PROTECTIVE COATING SYSTEMS ( REFER -
www.paintsquare.com ).


ELECTRO PLATING / ANODIZING / GALVANIZING [ TOP ]

METHODS OF SURFACE COATINGS GIVING CORROSION PROTECTION AGAINST ATMOSPHERIC (CORROSION) OXIDATION, ADDITIONAL THICKNESS TO GIVE WEAR RESISTANCE ETC., COATING THICKNESS ACHIEVED IS BASED ON PROCESS SELECTION, SURFACE PREPARATION, PICKLING BATH, NEUTRALIZATION, STOP BATH, TEMPERATURE OF BATH, BATH CONCENTRATION ETC.

CATHODIC PROTECTION [ TOP ]

BURIED STRUCTURES - PIPELINES / SUBMEREGED STRUCTURES CALL FOR CATHODIC PROTECTION IN ADDITION TO PROTECTIVE COATINGS. WHEN BURIED OR IMMERSED IN SEA WATER, WATER SATURATED SOILS OR MUDS A SMALL ELECTRIC CURRENT FLOWS FROM ACTIVE POTENTIALS / ANODIC SITES TO NEGATIVE POTENTIALS / CATHODIC SITES SURROUNDED BY THE EVALUATION OF HYDROGEN OR REDUCTION OF OXYGEN. WHEN THE ENTIRE STEEL SURFACE IS CONVERTED INTO A CATHODIC RELATIVE TO AN EXTERNAL ANODE IT WILL NOT CORRODE.

SACRIFICIAL ANODES
IMPRESSED CURRENT SYSTEM
METAL ANODES
TO ELIMINATE DOWN TIME
TO COMBAT CORROSION
TO REDUCE MAINTENANCE COST

APPLICATION PROCEDURES FOR CORROSION & PROTECTION

PROCESSES

METAL REACTION WITH ELECTROLYTES DIFFERS FROM CHEMICAL CORROSION - (DRY GASES) NON ELECTROLYTES.

GALVANIC CORROSION: ELECTROLYTE - METAL REACTION - METAL DISSOLUTION - LOSS OF METAL.



CORROSION CONTROL : APPLICATION OF SINGLY OR COMBINATION

CHANGE OF METAL ( ALLOYS AND CORROSION RESISTANT MATERIALS )
CHANGE OF ENVIRONMENT ( INHIBITORS )
CHANGE OF METAL POTENTIAL ( CATHODIC AND ANODIC PROTECTION )
USE OF COATINGS ( ORGANIC, INORGANIC OR METALLIC )

welding and welding procedures, cross country pipelines, downhill technique, off shore structures techniques, plant shutdown and maintenance, system documentation safety, system documentation quality, inspection surveillance, powerplant procedures, corrosion and prevention techniques, protective coating, heat treatment, continuos improvement-kaizen, planning and scheduling, failure analysis, audit-system verfication

MEASURES AGAINST CORROSION

ISOLATION FROM ENVIRONMENT
ENVIRONMENT TREATMENT
ELECTRIC ANTI-CORROSION

  ELECTRIC CELL AT CORROSION

CURRENT DIRECTION

welding and welding procedures, cross country pipelines, downhill technique, off shore structures techniques, plant shutdown and maintenance, system documentation safety, system documentation quality, inspection surveillance, powerplant procedures, corrosion and prevention techniques, protective coating, heat treatment, continuos improvement-kaizen, planning and scheduling, failure analysis, audit-system verfication

CONSIDERATIONS

SELECTION OF LESS PERMEABLE MATERIAL ( WATER / OXYGEN / ELECTROLYTE)
ADHESIVENESS TO THE BASE INCLUDING SURFACE PREPARTION.
FORMULATING TECHNIQUE ( PIGMENT / ADDITIVES... ETC.,)
THICKNESS ( PAINT FILM )
PAINTING SYSTEM RECOMMENDED



COATING AND WRAPPING ( AWWA C- 203 & BS 4164 )
[ TOP ]

BURIED UNDERGROUND PIPELINES GENERALLY CALLS FOR EXTERNAL CORROSION COATINGS WITH THE FOLLOWING OPERATIONS.

CLEANING THE PIPE SURFACE
welding and welding procedures, cross country pipelines, downhill technique, off shore structures techniques, plant shutdown and maintenance, system documentation safety, system documentation quality, inspection surveillance, powerplant procedures, corrosion and prevention techniques, protective coating, heat treatment, continuos improvement-kaizen, planning and scheduling, failure analysis, audit-system verfication
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PRIMING BY COAL TAR PRIMER
COATING BY COAL TAR ENAMEL
INNER WRAPPING WITH GLASS FIBRE
OUTER WRAP OF KRAFT PAPER OR EQUIVALENT
HOLIDAY DETECTION BEFORE LOWERING
ALTERNATIVELY HEAT STRINK SLEEVES ARE ALSO RECOMMENDED

REFRACTORY LINING [ TOP ]

THE SELECTION OF MATERIAL FOR INSULATION AND REFRACTORY CARTABLES IS BASED ON OPERATING CONDITIONS.
-

GAS
H
INLET TEMPERATURE
DESIGN TEMPERATURE
OPERATING PRESSURE
AMBIENT TEMPERATURE
MAXIMUM - SKIN TEMPERATURE

PRECAUTION : - STORING, PREPARATION, MIXING AND PLACING PROCEDURES (CURING - DRYING).

RUBBER LINING
[ TOP ]

VESSELS, EQUIPMENTS, STEEL PIPES ( IS 4682 PART I) ( BSCP 3003 PART I) CHOICE OF TYPE OF RUBBER LINING - OPERATIONAL AND ENVIRONMENTAL CONDITIONS SUBJECTED TO IN SERVICE.

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