The cost of a high-quality 250-horsepower compressor was $13,900 when recently purchased. What would a 620-horsepower compressor be expected to cost? Component/ System/ Plant Size Range Exponent Activated sludge plant 1-100 MGD 0.84 Aerobic digester 0.2-40 MGD 0.14 Blower 1000-7000 ft/min 0.46 Centrifuge 40-60 in 0.71 Chlorine plant 3000-350,000 tons/ year 0.44 Clarifier 0.1-100 MGD 0.98 Compressor, reciprocating (air service) 5-300 hp 0.90 Compressor 200-2100 hp 0.32 Cyclone separator 20-8000 fts/ min 0.64 Dryer 15-400 ft2 0.71 Filter, sand 0.5-200 MGD 0.82 Heat exchanger 500-3000 ft2 0.55 Hydrogen plant 500-20,000 scfd 0.56 Laboratory 0.05-50 MGD 1.02 Lagoon, aerated 0.05-20 MGD 1.13 Pump, centrifugal 10-200 hp 0.69 Reactor 50-4000 gal 0.74 Sludge drying beds 0.04-5 MGD 1.35 Stabilization pond 0.01-0.2 MGD 0.14 Tank, stainless 100-2000 gal 0.67 Note: MGD = million gallons per day; hp = horsepower; sefd = standard cubic feet per day. A 620-horsepower compressor costs $