Transcript UNDERSTANDING VINYL ESTER AND EPOXY TANK LINING …

UNDERSTANDING VINYL ESTER
AND EPOXY TANK LINING
PROPERTIES FOR THE POWER
INDUSTRY: TIPS FOR OWNERS
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Outline
▪Permeation Protection
▪Temperature Resistance
▪Chemical Resistance
▪Abrasion Resistance
▪Film Thickness
▪Flexibility / Elongation
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Outline
▪Adhesion
▪Cure
▪Material Pricing
▪Labor / Application Considerations
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OVERVIEW
▪ The process of burning fossil fuels to generate electricity
creates many corrosive environments including storage of
corrosive chemicals, containing chemical and dewatering
processes, and transfer of gasses, liquids, and solids many of
which are elevated temperatures.
▪ This presentation deals with defining and evaluating some of
the variables associated with the selection of the proper epoxy
or vinyl ester based materials for the protection of the power
producers’ assets.
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Permeation Protection
▪ Barrier coatings – remove the electrolyte bridge from the
corrosion process
▪ Permeation
▪ Definition - Permeation is the penetration of a permeate (liquid, gas,
▪
or vapor) through a solid.
Role in corrosion
▪ Measurement by ASTM E-96
▪ Application factors that effect permeation
▪ Coatings characteristics that effect permeation
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Temperature Resistance
▪ Glass Transition - Tg
▪ Maximum Temperature Resistance
▪ Dry
▪ Immersion (water)
▪ Chemical
▪ Specific Considerations
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Chemical Resistance
▪ Is a function of the lining base chemistry
▪ Average Molecular Weight
▪ Degree of cross linking
▪ Data should be obtained from manufacturer
▪ General lining chemistry can be researched through generic
chemical resistance tables
▪ Temperature dependent
▪ Caution should be used in evaluating mixtures and/or the
effect of sunlight
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Abrasion Resistance
▪ ASTM D4060 – Taber testing
▪ Comparing “Apples to Apples”
▪ Wheel
▪ Weight
▪ Revolutions
▪ Evaluating the results
▪ Abrasion variables
▪ Type of solids
▪ Amount of solids
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Abrasion Resistance
▪ A function of the polymer’s strength
▪ Additives
▪ Ceramic Linings
▪ Reinforcements
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Film Thickness
▪ Effect of Physical Performance
▪ Permeation performance
▪ Abrasion performance
▪ Flexibility
▪ Return on investment
▪ Minimum to function
▪ No appreciable improvement
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Flexibility / Elongation
▪ The importance is a function of the application
▪ Vinyl Ester vs. Epoxy
▪ Exceptions
▪ Tests for Tensile Properties
▪ ASTM D638
▪ ASTM D882
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Adhesion
▪ Adhesion – Bond strength
▪ Stress Factors
▪ Thermal Coefficient of expansion
▪ Physical Forces
▪ Tests
▪ ASTM D4541 – Steel
▪ ASTM D7234 - Concrete
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Cure
▪ Materials cure through polymerization (chemical reaction)
▪ Dry vs. Cure
▪ Recoat
▪ Time to final cure
▪ Ambient/Forced Cure
▪ Environmental Effects
▪ Temperature
▪ Moisture
▪ Oxygen
▪ Sunlight
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Material Price
▪ Evaluation of the price of material
▪ $’s/gallon
▪ Percent solids
▪ Coverage rates
▪ Life Cycle Evaluation
▪ Expected life of equipment
▪ Number of applications
▪ Cost of application
▪ Cost of down time
▪ Cost of Access
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Labor / Application Considerations
▪ Man Power
▪ Man Power Loading
▪ Skill Requirements
▪ Material Factors
▪ Number of coats
▪ Complexity
▪ Application Methods
▪ Value / Cost
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Conclusion
▪ Epoxy and Vinyl Ester chemistry has been used to formulate a
wide range of coatings and linings to successfully perform in a
number of very different environments.
▪ In order to achieve this performance there are variables to be
considered when trying to match the right coating to your
application.
▪ Proper research into the application’s requirements and
coating/lining’s properties should be made before specifying
the product(s) to be used.
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▪Questions??
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▪Thank you
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