NACE Installing Quality Internal Tank Linings.ppt

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1. Installing Quality Internal Tank
Linings: A Perspective
David Cushman
West Virginia Paint LLC
General Manager
NACE Certified Coating Inspector #1591
Copyright 2013

2. 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….

3. Dust
•Abrasive blasting is a
dusty process!

4. If you don’t manage your dust….
•You can wind up with a
coating like this.

5. 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

6. Test for chloride contamination
•Can test using various
methods
•What are the sources of the
contaminant?
•Hydro test water
•Product sludge
•Tracking on feet

7. Surface preparation is a visual standard that needs to be met with
tough working conditions

8. SP-10 near white vs. SP-5 white metal

9. 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

10. Dehumidification

11. Two cardinal rules
Rule 1: What goes in, must come out!
=

12. Rule 2: What goes up, must come down!

13. Cleaning the residual dust and grit
•Where to look?

14. 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

15. Dancing?

16. Once the surface is clean …
•Applying the proper
coating at the proper
thickness
•Applying the proper
coating to the proper
surfaces

17. Selecting the Coating
•MIL –PRF-4556(F)
•Types of Coating- Generic
•Film Build
•Where to apply?

18. Epoxies- Generic
•Amine
•Phenolic
•Novolac
•Other high performance products

19. 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?

20. 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

21. Film Thicknesses
•Specifications define
film thickness
•It is possible that there
is excessive pitting and
there is not enough
coating film

22. So what substrate condition are you starting
with?

23. If you apply a thin film too thick…

24. If you apply a thick film too thin

25. This coating is just right!

26. 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

27. Curing
•Proper curing is essential to a good job.
•If you rush the cure, you might be throwing
away the whole job.

28. Importance of floating suction

29. Coating may be performing
multiple functions
•Protecting the steel substrate from corrosion
•Preserving product quality

30. 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”

31. 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

32. Any questions?