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| Monroe
Unit 3
Low Pressure Turbine, Guide Blade Drain Design
ICE personnel
working under a Dynamic Power Technologies, LLC contract,
conducted a comprehensive design and confirmatory analysis
for Siemens-Westinghouse Power Corporation (SWPC) regarding
the addition of new steam drain lines routed from the Low
Pressure (LP) turbine cylinder; out through the condenser
wall to an existing extraction line. The Monroe Unit 3 LP
turbines are being retrofitted and consequently require a
means for protecting the last row blades from erosion due
to water droplets in the wet steam. This will be accomplished
by routing superheated extraction steam through the inside
of the hollow last-row stationary blades. The resulting temperature
difference between the hotter inside and colder outside of
the hollow blades will evaporate and prevent the formation
of water droplets on the outside surfaces. Because some of
the steam inside the blades will condense in the process,
new drain lines are required.
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ICE personnel
worked with SWPC engineering to optimize the requirements for
the system, including details of a loop seal and check valve.
During the course of the design, various pipe routings were
investigated/analyzed (in accordance with ASME B 31.1 requirements)
to minimize material and field fabrication costs. The final
arrangement is unique and cost effective because no pipe supports
are required inside the condenser. In addition, a single expansion
joint at the condenser wall is used in lieu of what would normally
be specified as one bellows at each of the two LP cylinder nozzles.
The flexibility analysis, illustrated by the stress plot above,
considered deadweight, thermal effects (including LP cylinder
movements), pressure and the effects of steam flow on the outside
of piping contained within the condenser.
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