PLTU Cilacap 2x300 MW Unit #1

01 / 12 / 2009 - Project Date

Defect existing before overhaul Air leakage and block in air preheater led to the unit unable to operate in full load Hydrogen need to be made up three times per day due to bad leakage, also cause hydrogen generation beyond its maximum Valve stem of high pressure regulating valve broke off, turbine main governing valve leaks steam badly Overhaul and Trial Operation Commisioned by S2P, D&C company carried out grade C+ for Unit #1 in December 2009 According to the actual condition of unit #1, the summary items for unit #1 overhaul that confirmed to be solved in total is as follows: boiler 156items, turbine 102items, electric 172items, i&c 25items, relay and protection 20items, coal handling 9items, ash removal 10items January 16 2010 the unit #1 parallel off at 02.26. overhaul of grade C for unit #1 started. till january 28 2010 most of overhaul activities have finished and started the single equipment debugging and finished on January 31 During the overhaul, cracks were discovered in welding seam of partition plate, air preheater. it is very dangerous to the unit rush to repair immediately without any delay, as well as cleaning, the third part should be in charge due to damage of cleaning equipment, which quit the contract, our company has taken over and fulfilled cleaning for air preheater January 31 2010 the unit started up at 16.00 boiler start at 23.20 turbine started rotating at 01.52 February 1 2010, turbine rotation reached to rated speed 3000rpm and at 05.12 generator synchronized The man defects of unit #1 were eliminated totally through the minor overhaul. according to the regulations of the unit operation, at 5.12 february 1 2010, generator synchronized to the power grid for commercial operation after finished all test items the minor overhaul took 16days, 2hours and 46minutes from unit#1 parallel off to power grid Conclusion Overhaul of grade C+ has been accomplished at 10.00 February 11 2010 and inspected and accepted by s2p