Installing Quality Internal Tank Linings: A Perspective David Cushman West Virginia Paint LLC...
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Transcript of Installing Quality Internal Tank Linings: A Perspective David Cushman West Virginia Paint LLC...
![Page 1: Installing Quality Internal Tank Linings: A Perspective David Cushman West Virginia Paint LLC General Manager NACE Certified Coating Inspector #1591 Copyright.](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649d845503460f94a6afca/html5/thumbnails/1.jpg)
Installing Quality Internal Tank Linings: A Perspective
David CushmanWest Virginia Paint LLC
General ManagerNACE Certified Coating Inspector #1591
Copyright 2013
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External Paint or Internal Paint
• What is the difference?• Immersion service calls for better surface
preparation• Confined space issues• Surface access• Uninspectable for many years• And of course….
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Dust
• Abrasive blasting is a dusty process!
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If you don’t manage your dust….
• You can wind up with a coating like this.
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How do you measure clean?
• Cleanliness is very important
• Surface preparation needs to be a minimum SP-10 near white metal or better yet SP-5 white metal blasting
• Test for contaminants in the air stream
• Test for contaminants in the abrasive
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Test for chloride contamination
• Can test using various methods
• What are the sources of the contaminant?
• Hydro test water• Product sludge• Tracking on feet
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Surface preparation is a visual standard that needs to be met with tough working conditions
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SP-10 near white vs. SP-5 white metal
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Recycled media
Advantages• Less disposal• Less dust• “Cleaner” working
conditions
Disadvantages• Does not access to all
surfaces to be prepared• May be challenging to get
equipment into the tank • Difficult to ensure “sharp,
angular profile”• Recycle process does not
remove any contaminants, just classifies by particle size
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Dehumidification
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Two cardinal rules
Rule 1: What goes in, must come out!
=
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Rule 2: What goes up, must come down!
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Cleaning the residual dust and grit
• Where to look?
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Blowing and vacuuming
• Blowing is often used to remove dust from the surface
• OR Combination of Methods
• OSHA regulations regarding blowing with compressed air
• Vacuuming is used to cleaning the surface
• Vacuuming has hazards from static
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Dancing?
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Once the surface is clean …
• Applying the proper coating at the proper thickness
• Applying the proper coating to the proper surfaces
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Selecting the Coating
• MIL –PRF-4556(F)• Types of Coating- Generic• Film Build• Where to apply?
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Epoxies- Generic
• Amine• Phenolic• Novolac• Other high performance products
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Which surfaces get coated?How high do you coat?
• Do you coat the lower three feet?• Do you coat the entire wetted surface?• Do you coat the roof underside and structure?
• Internal piping and equipment?• Where is corrosion occurring?
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Inaccessible areas
• A tank built to API 650 with a lap welded roof and a rafter structure has plenty of areas that cannot be coated
• Only a best effort can be made
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Film Thicknesses
• Specifications define film thickness
• It is possible that there is excessive pitting and there is not enough coating film
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So what substrate condition are you starting with?
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If you apply a thin film too thick…
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If you apply a thick film too thin
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This coating is just right!
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Holiday testing and cure
• Holiday testing is done to ensure that the film has no voids
• This is the subject of an entire presention, beyond the scope of this discussion
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Curing
• Proper curing is essential to a good job.• If you rush the cure, you might be throwing
away the whole job.
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Importance of floating suction
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Coating may be performing multiple functions
• Protecting the steel substrate from corrosion• Preserving product quality
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ULSD and MIC- A connection?
• Recent developments showing accelerated corrosion for ULSD service
• Uncoated tank bottoms needing replacement after only 10 years
• New phenomenon- never had issues with conventional distillate products (high sulfur)
• MIC- “microbially induced corrosion”
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Good operations procedures are essential to keep the product clean!
• IN ADDITION TO INTERNAL COATING:
• Floating suction• Filtration and filter maintenance• Removal of residual dust and grit following
coating• Regular dewatering and sludge removal
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Any questions?