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Failure Mode 2 – General Buckling
2006 collapse of 1995 vintage penstock when ice plug in vent induced vacuum due to external pressure.
Page 1 and 2: Northwest Hydro Association May 17,
Page 3 and 4: Concerns • Safe, Reliable, and Ec
Page 5 and 6: Failure Mode 1 - Internal Pressure
Page 8 and 9: Galvanic corrosion at 1953 vintage
Page 10 and 11: Overall Shell Corrosion (typically
Page 12 and 13: An example of exterior stave wood d
Page 14 and 15: Slippage at shoes can release bands
Page 18 and 19: General buckling caused by uncontro
Page 20 and 21: Pipe collapsed when decayed top woo
Page 22 and 23: Local overhead “dents” in burie
Page 24 and 25: Failure Mode 4-Inadequate Support
Page 26 and 27: Cracked concrete saddle.
Page 28 and 29: Slope Instability
Page 30 and 31: Cracked foundation and buckled anch
Page 32 and 33: TOPIC 3 - FAILURE MODE INSPECTION T
Page 34 and 35: Basic Tools
Page 37 and 38: TOPIC 4 - Penstock Safety Program M
Page 39 and 40: Ketchikan Alaska Public Utilities (
Page 41 and 42: Step 1 Establish Baseline Condition
Page 43 and 44: Step 3: Documented Inspection, Main
Page 45 and 46: Important to “Expect the Unexpect

ASSESSMENT

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