annual overhauling of l and t make esp of unit 4 2x660 mw sstpp mppgcl dongalia- 1 cleaning, inspection & alignment rectification of esp passes 2 internal cleaning of esp fields & hoppers with water washing 3 preparation of scaffolding and internal inspection for fields 4 cleaning & inspection of frp & its heating elements 5 cleaning & inspection of support insulator & its heating elements 6 alignment of discharge electrode frame (complete frame) 7 repair & replacement of damaged components of esp 8 replacement / repairing of electrical single impulse (esi) rapping system (inlet gas distribution rapper, modulok collecting electrode rapper, rigitrode discharge electrode rapper). 9 internal repairing/ replacement of frp 10 repair/ replacement of support insulators. 11 replacement/repair of g.d. screen. 12 alignment of collecting electrode 13 repairing of rigitrode discharge electrode 14 reclamation/ replacement of rapper piston, rapper rod and boot mounting assembly of cerm /derm/ gdrm