External SCC of Pipelines John A. Beavers, Ph.D.,  FNACE
Pipeline SCC  –
Pipeline SCC  –
Pipeline SCC  –
Environment Material Stress Pipeline SCC  –  SCC
Two Forms of SCC <ul><li>High-pH (Classical) SCC </li></ul><ul><li>Near-Neutral-pH (Low-pH) SCC </li></ul><ul><ul><li>pH r...
Characteristics of Both Forms of  SCC
The dark area on the fracture surface indicates the extent of the crack before it was broken open Pipeline SCC  –
High-pH  SCC Photomicrograph showing high-pH stress corrosion crack.
Near-Neutral-pH  SCC Photomicrograph showing near neutral pH stress corrosion crack
External SCC  Integrity Management <ul><li>Three tools commonly used: </li></ul><ul><ul><li>Direct assessment </li></ul></...
Upcoming SlideShare
Loading in …5
×

Pipeline SCC

2,261 views

Published on

Published in: Business, Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
2,261
On SlideShare
0
From Embeds
0
Number of Embeds
95
Actions
Shares
0
Downloads
48
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Pipeline SCC

  1. 1. External SCC of Pipelines John A. Beavers, Ph.D., FNACE
  2. 2. Pipeline SCC –
  3. 3. Pipeline SCC –
  4. 4. Pipeline SCC –
  5. 5. Environment Material Stress Pipeline SCC – SCC
  6. 6. Two Forms of SCC <ul><li>High-pH (Classical) SCC </li></ul><ul><li>Near-Neutral-pH (Low-pH) SCC </li></ul><ul><ul><li>pH refers to electrolyte beneath disbonded coating, not soil pH </li></ul></ul>
  7. 7. Characteristics of Both Forms of SCC
  8. 8. The dark area on the fracture surface indicates the extent of the crack before it was broken open Pipeline SCC –
  9. 9. High-pH SCC Photomicrograph showing high-pH stress corrosion crack.
  10. 10. Near-Neutral-pH SCC Photomicrograph showing near neutral pH stress corrosion crack
  11. 11. External SCC Integrity Management <ul><li>Three tools commonly used: </li></ul><ul><ul><li>Direct assessment </li></ul></ul><ul><ul><li>Hydrostatic testing </li></ul></ul><ul><ul><li>In-line Inspection </li></ul></ul>

×