Tender For corrigendum : engineering, procurement, material selection, manufacturing, supply, inspection, delivery to site, freight and transit insurance, unloading, handling and storage at site, assembly, civil works, erection, testing, commissioning, successful performance guarantee, 3 months operation and maintenance and handing over of ash water recovery system including mandatory spares and tools and tackles for kothagudem thermal power station vii stage (1x800 mw)