System identification: Hydrogen cooler and main condenser for recirculating cooling water Solids/Liquid: Debris, sediment and corrosion by-products in brackish, aggressively corrosive cooling water Problem: Due to heavy sludge fouling, the shell and tube heat exchanger of the hydrogen cooler at a major east coast power plant had to be removed from service to be mechanically cleaned every six to eight weeks. This typically resulted in two days of

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