Attention On The Power Project For First Medupi Unit
State-owned power utility Eskoms current worst-case scenario for delivering initial
power to the grid from the first Medupi power station unit, or Unit 6, was currently September 2013, Engineering News Online has learned.
The unit would be the first of six to begin producing at the R100-billion (R125-billion when interest during construction was included), 4 800 MW coal-fired plant, which was currently under construction near Lephalale, in the Limpopo province.
The scenario was premised on there being no material improvement in the delivery of the key boiler contract, which was being built and installed by Hitachi in association with local and international subcontractors. Together, the boilers for Medupi, as well as the Kusile power station, which is being built almost simultaneously in Mpumalanga, were valued at R38.5-billion and represent the largest single contract ever awarded by Eskom.
There had been a range of problems with the project, which moved ahead in 2006 despite the absence of a finalised design and a funding plan, as well as a serious dearth of internal project management capacity, which was augmented by PB Power.
Initial site preparation was delayed, which had a knock-on effect to the laying of the civil foundations by a joint venture led by Murray & Roberts (M&R). Progress has since been made in agreeing the precise scope of the works and additional advances had been paid to M&R in line with that new scope.
But the boiler portion remained a concern and Eskom currently had serious doubts about the ability of Hitachi and its subcontractors to deliver on the contracted 48-month delivery schedule for the first unit. We manufacture complete sets of mining equipment, jaw crusher, compact crusher, ball mill.
A source close to the development said that, in other parts of the world, Hitachi generally delivered such units in 62 months and that it was also currently about ten-and-a-half months behind on the Medupi delivery schedule.
The delays had arisen partly as a result of serious deviations, against the original design, on the steel fabrication portion of the contract, which had been let to M&Rs Genrec between January and March more than 6 000 modifications had to be made.
But also, insufficient human resources had reportedly been mobilised for actual erection, which led to the appointment, in August, of Shanahan Engineering.
Site logistics were also described as appalling, which had further delayed erection, as had serious welding errors, which were currently being remedied by the appointment of yet more foreign welders, mainly from Thailand, as well as the introduction of an orbital welding machine.
The critical hydro-pressure test, which was scheduled for December 2011, would not take place this year. In fact, under the worst-case scenario, which was premised on the delivery performance to date, the pressure test would only take place in September 2012, which would result in first power in September 2013 and a ramp-up to full capacity over several months. Recent years, the machinery industry develops fastly, there are cone crusher, energy saving cone ball mill.
Eskom was meeting weekly with Hitachi and there were various scenarios under discussion to improve delivery by between 10% and 50%. Should a 10% improvement be achieved, first power would arise in June 2012. Should it improve by 20%, the date would be brought forward to May 2013 and a 50% improvement would result in first power by March 2013.
Hitachi Power Africa CEO Johannes Musel indicated recently that the first Medupi unit should be producing during the first half of 2013.
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