ASSESSMENT

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Failure initiated in heat affected zone of 1937 vintage longitudinal weld seam.
Page 1 and 2: Northwest Hydro Association May 17,
Page 3 and 4: Concerns • Safe, Reliable, and Ec
Page 5: Failure Mode 1 - Internal Pressure
Page 9 and 10: Random pitting pattern in 1939 vint
Page 11 and 12: Wood Stave Penstocks Internal press
Page 13 and 14: Steel band corrosion
Page 15 and 16: Seam failure due to gravity dead we
Page 17 and 18: 2006 collapse of 1995 vintage penst
Page 19 and 20: Blocked vent induced collapse Note
Page 21 and 22: Failure Mode 3 - Local Buckling “
Page 23 and 24: Relatively rare shear buckling of v
Page 25 and 26: Deteriorated saddles
Page 27 and 28: . Loss of support at tipped saddle
Page 29 and 30: Surge tanks require very stable fou
Page 31 and 32: Surge tank anchor bolt corrosion re
Page 33 and 34: Types of Inspection Cursory Inspec
Page 35: Check rivets for loss of material a
Page 38 and 39: Penstock Safety Program Effective P
Page 40 and 41: Ketchikan Lakes Beaver Falls
Page 42 and 43: Step 2 - Site Specific Inspection,
Page 44 and 45: Step 4: Periodic Comprehensive Cond
Page 46: Questions / Comments Thomas L. Kahl

ASSESSMENT

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