1. Atmospheric Corrosion Discussion BY John Williams The Tapecoat / Royston Company CHASE Construction Products TAPECOAT / ROYSTON

2. Opening Line

3. Discussion Format  Analysis of Environment  Transition Areas  Bridge Crossings  Vaults  Difficult Applications  Conclusions

4. Analysis of Environment  Line Temperature  Line Temperature Variance  Exposure to UV  Frost Heave  Harsh Backfill or Weed Whacker Attack

5. Line Temp & Variance

6. Line Temp and Variance

7. Exposure to UV

12. Harsh Backfill

13. Transition Areas  Definition: The area that begins at the frost line below grade and rises at least 24” above grade. 1.Frost line is different across the US 2.Below grade meaning buried pipe 3.Above grade meaning rising into the atmosphere

14. Transition Areas  Below Grade Forces impact coating: Soil stress or frost heave pull on the pipe and coating creating a unique environment during the winter months  Above Grade Forces impact coating: UV, harsh backfill, weed whackers, weather, and atmospheric temperatures continually wear on pipe coating  Product temperature can effect coating too.

15. Transition Area Pics

17. Bridge & Creek Crossings  Definition: An Atmospheric Application that has a Transition Area on both sides  New construction or Rehab with damaged coating to dispose  External forces that damage coating: UV, Atmospheric temp, product temp, weather, be it a rising creek with debris flowing down river or overflow from snow plow trucks  Human factor: kids walking across, or being used to fish from  Access problems  Preparation problems  Sweating surface limits coating choices

18. Bridge and Creek Crossings  Typical Limitations: Difficult access, removal and disposal of old coating, restrictive surface preparation, sweating pipe, and ambient temperature.  Limited Coating Choices: Coating choice is determined by environmental factors

19. Bridge Crossing

20. Bridge Crossing Encapsulation

21. Bridge Crossing

23. Creek Crossing

27. Vault Applications 1.Unique environment where a regulator station or other piping could be in an atmospheric condition and at times an underwater condition. 2.Typical Environment: Limited and restrictive access to area, wet surfaces, flanges that need to be inspected 3.Limited Surface Prep: Hand tools, no power, no sandblast

28. Vault Applications

31. Unique Applications  Real world applications that occur during the course of field work.

32. Unique Applications

40. CONCLUSIONS  Analyze the application environment  Analyze the surface prep choices available to the application  Narrow coating possibilities  Do once to maximize return