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Split Case Turbine
Solution: Utilizing small air impact tools and hand torque wrenches, the entire turbine is bolted in under 4 hours at a leisurely pace. The management of the company timed the installation for each size, start to finish, for 1 worker. Following the current Superbolt procedure, air impact tools were used for most of the tightening of the jackbolts. Final calibration is done with the hand torque wrenches. The times were as follows: 2" size: 1-2 minutes 3" size: about 3 minutes 3-1/2" and 4" size: 4-5 minutes Keep in mind, with Superbolt products, multiple workers can work simultaneously if room permits. This can be very valuable if the turbine work goes over schedule and unit generation is being lost. With Superbolt products and enough workers, it is possible to bolt or unbolt even the largest steam turbines in only a couple of hours! |
Problem: The awkward bolting
of this turbine amplifies the difficulties of the traditional hot
bolting method. It previously required 30-45 minutes per stud to
tighten using heating rods. Workers complained of the safety hazard
of the heating rods and the time and effort for the bolting process.