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    Hot Dip Galvanising

    Hot Dip Galvanising
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    HOT DIP GALVANISING

    [EIRI/EDPR/4750] J.C.: 2970INR, 2970 OMANI RIAL


    INTRODUCTION

    Galvanization is the process of applying a protective zinc coating to steel or iron in order to prevent it from rusting. The term is derived from the name of Italian scientist Luigi Galvani. Galvanized iron (GI) sheets are steel sheets which are basically coated with zinc and include a range of hot dip galvanized and electro-galvanized steel sheets. Zinc weathers at a very slow rate, so the coating generally has a long life. Zinc has a greater electro-negativity than iron and hence provides cathodic (or sacrificial) protection to the steel. This results in the zinc corroding in preference to the steel if the coating is chipped or damaged to expose the base metal. Besides acting as galvanic protector, The other functions of the zinc layer are as follow:

    • To retain the steel intact with its full initial strength.

    • To provide the surface a more pleasing appearance.

    • To increase the life of any suitable organic finishing system applied over it.

    • To protect the steel from corrosive attack in most atmospheres, acting as a continuous and lasting shield between steel and the atmosphere.


    COST ESTIMATION

    Plant Capacity            10 MT/Day

    Land & Building (2000 sq.mt.)    Rs. 1.24 Cr

    Plant & Machinery                    Rs. 1.10 Cr

    Working Capital for 2 Months    Rs. 1.37 Cr

    Total Capital Investment          Rs. 3.94 Cr

    Rate of Return                          38%

    Break Even Point                      63%


    CONTENTS

    INTRODUCTION

    ADVANTAGES OF GALVANISING

    THE USE OF GI SHEETS GIVES THE FOLLOWING ADVANTAGES

    USES AND APPLICATION OF GALVANISING

    MARKET SURVEY OF HOT DIP GALVANIZING

    KEY PLAYER IN THE HOT DIP GALVANIZING MARKET

    BENEFITS OF GALVANIZING

    CORROSION PROTECTION

    DURABILITY

    LONGEVITY

    VERSATILITY AND DURABILITY

    ENVIRONMENTAL ADVANTAGES

    STEPS IN HOT DIP GALVANIZING

    THE EFFECTIVE FORM OF GALVANIZATION PROVIDES 2 LEVELS OF PROTECTION:

    THERE ARE 3 STEPS IN HOT-DIP GALVANIZATION:

    SURFACE PREPARATION FOR HOT DIP GALVANIZING

    CLEANING STEEL TO PREPARE FOR THE HOT-DIP GALVANIZED COATING CONSISTS OF THREE STEPS:

    DEGREASING

    PICKLING

    FLUXING

    PROCESS FLOW CHART

    GALVANISING PROCESS

    THE GALVANIZING PROCESS CAN BE GROUPED TOGETHER UNDER THREE CATEGORIES, NAMELY

    SOME OF THE COMMON TERMINOLOGY USED IN GALVANIZING PROCESS IS AS FOLLOWING:

    ASH –

    DROSS –

    FLUX –

    OVER-PICKLING –

    INHIBITOR –

    GALVANIZING BATH –

    ALUMINUM ADDITIONS –

    COATING THICKNESS

    DETAILS OF HOT DIP GALVANIZING PROCESS

    ALL GALVANIZING CONSISTS OF FOUR FUNDAMENTAL STEPS:

    SURFACE PREPARATION:

    DEGREASING:

    CLEANING:

    PICKLING:

    AGITATION:

    RINSING:

    FLUXING:

    GALVANIZING:

    IMMERSION:

    WITHDRAWAL:

    WATER QUENCHING:

    CENTRIFUGING:

    THREAD BRUSHING:

    POST TREATMENT:

    STACKING:

    5. INSPECTION

    CHARACTERISTICS OF GALVANIZED SURFACES

    6. QUALITY CONTROL

    INSPECTION & TESTING

    GALVANIZING PLANT SAFETY AND STANDARD

    GALVANIZING STANDARDS

    ASTM STANDARDS

    THE THREE GOVERNING ASTM SPECIFICATIONS FOR HOT-DIP GALVANIZING ARE:

    OTHER GALVANIZING STANDARDS

    THERE ARE ALSO A FEW INTERNATIONAL GOVERNING STANDARDS TO BE AWARE OF:

    PRE-GALVANIZING

    POST-GALVANIZING

    SUPPLIERS OF RAW MATERIALS

    SUPPLIERS OF ZINC INGOT

    SUPPLIERS OF CASTIC SODA

    SUPPLIERS OF HYDROCLORIC ACID

    ADDRESSES OF PLANT AND MACHINERY SUPPLIERS

    SUPPLIERS OF DG SETS

    SUPPLIERS OF EOT CRANES

    SUPPLIERS OF POWER TRANSFORMERS

    SUPPLIERS OF ELECTRICAL PANEL

    SUPPLIERS OF ELECTRIC MOTOR

    SUPPLIERS OF COOLING TOWER

    SUPPLIERS OF EFFLUENT TREATMENT PLANT (ETP PLANT)

    SUPPLIERS OF AIR POLLUTION CONTROL EQUIPMENTS

    SUPPLIERS OF AIR CONDITIONING EQUIPMENTS

    SUPPLIERS OF AIR COMPRESSORS

    SUPPLIERS OF PLATFORM WEIGHING MACHINE

    SUPPLIERS OF MATERIAL HANDLING EQUIPMENTS

    SUPPLIERS OF FIRE FIGHTING EQUIPMENTS

    SUPPLIERS OF SHOT BLASTING MACHINE

    SUPPLIERS OF JIGS AND FIXTURE

    SUPPLIERS OF SUBMERSIBLE WATER PUMP


    APPENDIX – A:

    01. PLANT ECONOMICS

    02. LAND & BUILDING

    03. PLANT AND MACHINERY

    04. OTHER FIXED ASSESTS

    05. FIXED CAPITAL

    06. RAW MATERIAL

    07. SALARY AND WAGES

    08. UTILITIES AND OVERHEADS

    09. TOTAL WORKING CAPITAL

    10. TOTAL CAPITAL INVESTMENT

    11. COST OF PRODUCTION

    12. TURN OVER/ANNUM

    13. BREAK EVEN POINT

    14. RESOURCES FOR FINANCE

    15. INSTALMENT PAYABLE IN 5 YEARS

    16. DEPRECIATION CHART FOR 5 YEARS

    17. PROFIT ANALYSIS FOR 5 YEARS

    18. PROJECTED BALANCE SHEET FOR (5 YEARS)

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