Drum for generator steam of HRSG boilers systems (Heat recovery steam generator) during construction in Combined-Cycle Co-Generation Power Plant. Beautiful pond in spring park Drum for generator steam of HRSG boilers systems (Heat recovery steam generator) during construction in Combined-Cycle Co-Generation Power Plant. Cooling tower systems for supply cooling water to mature equipment in power plant about industrial concept. air conditioner cooling towers on a roof Worker painting steel tube with paint brush selective focus on hand Drum for generator steam of HRSG boilers systems (Heat recovery steam generator) during construction in Combined-Cycle Co-Generation Power Plant. Cooling tower