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Kaplan Blade Bolts
Old Method: Heating Rods with extensiometer check. Installation: 5-8 hours per blade due to the time required for heating & cooling of bolts, then extensiometer check. Removal - up to a full shift per blade.
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A
representative of this company discovered Superbolt® at a trade
show just prior to the unit outage. The individual was very enthusiastic,
stating: "We have been struggling with this problem for years!
I can't believe how simple the answer is!" He immediately
consulted with engineering and purchasing to apply Superbolt Tensioners
to his unit. The Torquebolts® were designed by Superbolt within
two days of the initial inquiry from the trade show and the product
was shipped within a week.
Superbolt
Solution: (30)
M60 Torquebolts®,
two o-rings per bolt to provide a seal between oil lubrication
and water flow through the turbine. Extensiometers were used for
the first few Torquebolts® installed. The check confirmed .015" stretch
achieved at 85 ft•lbs jackbolt torque. Installation required
about 35 minutes per blade (6 minutes per Torquebolt®).