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<br />001701 <br /> <br />Ring-follower Gates <br /> <br />. Perfolrm interior inspection after: <br /> <br />5 days of operation in a single valve operated above 1600 c.f.s <br />... The 5 day requirement should be expected to change with <br />information gained during operations and subsequent inspections. <br />Detailed records of flowrates and the time the gate was exposed <br />should be kept for for the inspection <br /> <br />Yearly for flows less than 1600 c.f.s. <br />... Perform interior inspection early enough before spring startup to <br />effect repairs if necessary. <br /> <br />Weekly inspection of the hanger and gate's position. <br />... The weekly requirement should be expected to change with <br />information gained during operations and subsequent inspections <br />This requires observation from the valve house only. <br /> <br />. Inspection requires closure and lockout of 6-foot by 13-foot gate and <br />draining of the penstock. <br /> <br />· Inspect.ion for interior <br />q> Jf damaged, plans should be made for immediate repair. <br />Cavitation will "jump" downstream and will multiply it's damage <br />rapidly. The valve's casting would be hard to replace and the more <br />welding required, the more likely casting cracking is to occur. <br />. Inspe,ct the cylinder operator, all packing, structural and hydraulic piping <br />integrity. Inspect the leaf connection to the stem. Operate the hanger. <br />. The gate's interior is difficult to access from the penstock because of the <br />pipe's steepness. <br /> <br />General ,. opics/11 O-inch Penstock <br /> <br />. Perfoll'm interior inspection of the Penstock after: <br /> <br />5 days of operation in a single hollow jet valve operated above 1600 <br />c.f.s <br />q> The 5 day requirement should be expected to change with <br />