Facilitator- Richard Boswell, Stress Engineering Services

DISCUSSION ITEMS

1. Refractory Stiffness
2. Hot Spots
3. Nozzle – insert plate or repad
4. Improper refractor
5. Expansion Joint
6. Local Distortion & Refract. Failure
7. EJ: Lateral movements
Line Bending – non uniform temperature
8. EJ: VIB-CPT Flow
9. Pressure Thrust Risers
Surge Overloads
Upsets – Slug Flows
Design for Pressure End Load
Mass Impact
Normal Density
Upset Density

Need input from licensor or plant history of catalyst log.

10. Erosion
vessel metal
refractory liners
11. Cat Imbalance – aeration not adequate; slug flow – vibration and high loads
12. Hot Spots Top Head at cyclone hanger/supports
13. Bimetallic Joint
14. After Burn – Creep and Weak on SS
15. Hexmesh Failure
corrosion on welds
See John Handcock – API Dallas