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- W1998021270 abstract "The primary life extension technique for penstocks is assuring that the corrosion protective coating and lining is intact and functioning. There are five primary steps that must be performed for life extension. These include (1) Visual inspection determining the age of the existing system, performing an internal inspection of the condition of the internal lining or performing localized inspections at access locations; (2) Thickness measurements to determine the thickness of the penstock shell to insure that there is sufficient wall thickness for safe operation prior to spending money on coating/relining of the penstock. This requires representative ultrasonic thickness measurements to be taken and a statistical evaluation to be performed; (3) Powerhouse operating pressure, assessment done in conjunction with the penstock shell thickness, includes operational tests performed to measure the maximum operating pressures in the penstock. This is done by performing a series of load rejection tests; (4) Stress level evaluation done using the penstock wall thickness measurements and the penstock pressure data, Based on the outcome, it can be determined if the penstock is safe to coat/reline, or the penstock needs to be replaced; and (5) Coating/lining rehabilitation is the phase. Included in this phase is a Contractor qualification process, such as Steel Structures Painting Council's QP1, QP2 and QP3 quality process, selecting the appropriate coating system to minimize down time, specification development, and performing the actual work." @default.
- W1998021270 created "2016-06-24" @default.
- W1998021270 creator A5014413880 @default.
- W1998021270 date "1999-07-05" @default.
- W1998021270 modified "2023-09-27" @default.
- W1998021270 title "Penstock Life Extension" @default.
- W1998021270 doi "https://doi.org/10.1061/40440(1999)31" @default.
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