A typical turnkey 500 MWe unit FGD system retrofit requires 380,000=man-hours, or approximately 200 person-years, of which 20 percent, or 72,000 man-hours, are dedicated to engineering and project management,3 and roughly 40 percent of man-hours are for boilermakers.
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An FGD system requires 380,000 man hour.
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An FGD system only needs 10,000 man hours.