duvha power station turbine failure
Power utility Eskom has started an investigation into a fire at its Duvha power station in Mpumalanga, after a 600 MW unit at the power station was severely damaged during a routine turbine test. History. Eskom’s Duhva power station in Mpumalanga was extensively damaged in a major accident last month, putting heavy pressure on South Africa’s already precarious power … 18 Mar 2011. History []. Construction of Duvha Power Station started in November 1975 and the last unit came into operation in 1984. Various parameters were also found not to be correctly set to design specifications. • Similar damage as seen on Unit No. [6], Location of Duvha Power Station in South Africa, "Cost comparisons between electrostatic precipitators and pulse jet fabric filters and inherent challenges of both technologies at ESKOM's 6 X 600 MW units at Duvha Power Station", "GE claims Eskom favoured Chinese firm's bid, with backing of Trillian", President of South Africa Residence Nkandla, https://en.wikipedia.org/w/index.php?title=Duvha_Power_Station&oldid=995326378, Coal-fired power stations in South Africa, Infobox mapframe without OSM relation ID on Wikidata, Thermal power station articles using Infobox power station, Creative Commons Attribution-ShareAlike License, This page was last edited on 20 December 2020, at 12:41. Duvha has six units each with a sent out capacity of 575 MW, so as a base load station it represents 3450 MW on the national grid. In 1993 Duvha became the first power station in the world to be retrofitted with pulse jet fabric filter plants on three of its six units. Three of the units use electrostatic precipitators with sodium trioxide injection. Eskom … Dames said Eskom was focused on getting the station back up and running, and was in the final stages of procuring spare parts. At the time of its construction, Duvha was a giant of. Before the bearing failure occurs, the temperature change rate is abnormal in most cases. “Eskom is taking comprehensive action to address the findings of the report,” Dames said. superlatives: it cost a staggering R1.6 billion to build, its chimneys were largest. Construction of Duvha Power Station started in November 1975 and the last unit came into operation in 1984. It is not yet clear how long Eskom’s embattled Duvha power station will be limping after “an apparent over pressurisation incident” rendered its unit 3 out of action on Monday night. Sweeping the bullshit as well as the taxpayer’s money under the carpet!! In April 2017 General Electric filed a court application accusing Eskom of rigging the tender to install a new boiler at the station so that Dongfang Electric would get the contact even though their bid was R1 billion (US$76 million) more than the General Electric bid. In 1993 Duvha became the first power station in the world to be retrofitted with pulse jet fabric filter plants on three of its six units. Remember the Vertical Turbine pump, we would have to remove the pump from both the suction and discharge pipe work, messy. last-stage blades. He warned that electricity supply would continue to be critical for the next two years. On the day of the accident, turbine № 2 worked as the plant’s power output regulator. The major failure at Duvha power station in Mpumalanga was caused by operator error, Eskom said on Wednesday. by News Kick in Articles 0 comments. One worker was killed and damage was estimated at US$100 … The remaining three feature ABB fläkt Optipulse pulsejet fabric filters. 4 with a fire, ruptured shafts & components leaving the building • Minimal visible damage to outside of LP casings Turbine Overspeed Test Failure. The pumps will be installed to achieve a flow rate of Construction of Duvha Power Station started in November 1975 and the last unit came into operation in 1984. The insurers had agreed to settle the claim so it would not impact Eskom's financial position. Duvha was one of South Africa’s largest fossil fired power stations, and was often referred to as the "flagship" of the ESCOM fleet. Destruction of the plant as it fell from the Niagara Gorge wall and collapsed into the Niagara River, caused by water seeping into the back wall of the power station. They found the root cause of the failure was a modification of the electro-hydraulic governor controller done in 2004 while the direct cause was operator error. They are very lucky they didn’t lose the entire station. 6x600 MWe Coal Overspeed Test Failure: 9 February 2011. Duvha Power Station in Mpumalanga, South Africa, is a coal-fired power plant operated by Eskom. [3] On 9 February 2011 another unit failed catastrophically while performing over speed testing. Steam turbine rotor vibration that results in premature failure of blades and other components is one of the most serious problems in power plant operations Duvha LSB Failure 2003 • Sister Unit No. The 300 metres (980 ft) tall chimneys at Duvha are the second and third tallest structures in Africa, only a chimney located at the Secunda CTL plant is taller. Duvha power station details. Scary thing is Duvha has a shared turbine hall. "This is a statutory test that is carried out in every power station. Plant process parameters revealed instrumentation errors and discrepancies between plant gauges and the operator’s mimic across all units. The combined generating capacity of the six units is 3 600 MW, enough power to supply a city three times the size of Johannesburg with electricity on a winter’s night. It was the first power station in South Africa to have a black power station manager, Ehud Matya. Duvha power station’s very big bang 15th April 2011 By: Terry Mackenzie-hoy Just about everybody now knows that the Number 4 turbine at Eskom’s Duvha power station has gone to heaven. The recent damage to the 600MW units at Duvha Power Station presents a challenge to state-owned power utility Eskom. DUVHA POWER STATION FOR A PERIOD OF THREE YEARS C1.1 Form of Offer & Acceptance Offer THE PROVISION INDUSTRIAL CLEANING SERVICES ON BOILER & TURBINE PLANT AREAS OUTSIDE PLANT AREAS AT DUVHA POWER STATION Options A The offered total of the Prices exclusive of VAT is Sub total The offered total of the amount due inclusive of VAT is 1 (in words) Duvha has always been a baseload station and the 2007 blade failure occurred at around six in the morning before the daily activities started, hence the lack of injuries. Duvha Blade Root Failure May 30, 2018 | Author: Nalise Hahn | Category: Turbine , Medical Ultrasound , Power Station , Electric Generator , Applied And Interdisciplinary Physics DOWNLOAD PDF The incident happened when the 600 MW units at Duvha had been taken off load to perform a required turbine test. “We are concerned about summer and are urging all our customers to work with us and save electricity,” Dames said. A last stage turbine blades failure was experienced in two units of 660 MW. Share. Niagara Falls, New York. These plants contribute largely to the reduction of air pollution by removing 99.99% of the fly ash, which otherwise would be released into the air through the station's chimneys. “The direct cause of … The 300 metres (980 ft) tall chimneys at Duvha are the second and third tallest structures in Africa, only a chimney located at the Secunda CTL plant is taller. not for publication – background info. Conclusion Dhuva Power Station, approved of our presentation and, yes they placed an order for 2 x 300mm the biggest in our range Self-Priming pumps, order value R600K. The incident happened when the 600 MW units at Duvha had been taken off load to perform a required turbine test. Eskom added that the event had taken place when the 600MW unit at Duvha had been taken off load to perform a required turbine test. All rights reserved, Please visit the official Government information portal for Coronavirus by clicking HERE. “We are now in maintenance season and we normally take advantage of low demand (to do maintenance) but these days South Africans all have air conditioners so demand is not that low any more,” he said. History. Duvha power station is a coal fired power station built between 1978 and 1984, it is situated near eMalahleni (Witbank) in Mpumalanga. At 8:12 the turbine № 2 output power was reduced by an automatic turbine regulator, and it entered into a powerband unrecommended for the head pressure that day. 2 suffered a last stage blade (LSB) failure on 8 January 2003. These units have one high-pressure turbine and two tandem-compound low-pressure turbines with 44-in. However, the other five units of the 3 600MW power station were running normally. “This is a statutory test that is carried out in every power station. Shortly afterwards the bolts keeping the turbine № 2 cover in place were broken. The three units were retrofitted with pulsejet fabric filters in 1993. Duvha, South Africa. Siemens are not the OEM and were never involved. The 300 metres (980 ft) tall chimneys at Duvha are the second and third tallest structures in Africa, only a chimney located at the Secunda CTL plant is taller. In 1993 Duvha became the first power station in the world to be retrofitted with pulse jet fabric filter plants on three of its six units. Duvha was a major setback in an already tight supply system. Duvha coal-fired power station unreported accident . Transcript Blade Root / Blade Attachment Inspection by Advanced UT and Phased Array Technique Dr. Michael F. Opheys, Hans Rauschenbach, Michael Siegel; Siemens AG Power Generation, D-45466 Mülheim (Germany) Graham Goode; Siemens Power Generation, Newcastle (UK) Detlev Heinrich; Cegelec AT GmbH & Co KG, Nürnberg (Germany) Corresponding Author Contact: Email: [email … facebook twitter google+ News Kick No comments: Post a … A well-informed, close observer of this photographed turbine-explosion at the 3600MW fossil-fuel power station in Mpumalanga on February 10 2011 writes:“They were doing a test of the turbine overspeed protection system, and in short, the protection did not kick in. unit came into operation in 1984. The 300 metres (980 ft) tall chimneys at Duvha are the second and third tallest structures in Africa, only a chimney located at the Secunda CTL plant is taller. On 8 January 2003, Unit 2 generator exploded while being returned to service after a malfunction. History: Construction of Duvha Power Station started in November 1975 and the last. Duvha Power Station in Mpumalanga, South Africa, is a coal-fired power plant operated by Eskom. Well, in the worst case, all the Duvha turbines are faulty and the African National Congress company, Chancellor House, buys 25% in a turbine company to replace them at five times their actual cost. Duvha Blade Root Failure - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. In 1993 Duvha became the first power station in the world to be retrofitted with pulse jet fabric filter plants on three of its six units. Eskom still had a critical maintenance backlog and this could not be put off for much longer. The trouble at Duvha would take 575MW out of the system for more than a year, Eskom said previously. – Sapa, © 2021 Independent Online and affiliated companies. All six units are placed in one long straight stripe, with no missile shield between them. The station is a twin sister to Tutuka Power Station. In the execution of the test, the protection of the unit failed, causing severe mechanical damage and starting a fire, which was brought rapidly under control by the power station’s fire team,” said Joffe. Duvha Power Station in Mpumalanga, South Africa, is a coal-fired power plant operated by Eskom. Station Employees: Approximately 900. The station consists of six 600 MW units with a total installed capacity of 3,600 MW operating with a turbine Maximum Continuous Rating of 37.6%. Tags: Articles. Email. And if you look at the third last pic you can see how big that shaft is, if that landed on another turbine it would have destroyed that too. Last Thursday Eskom announced that Unit Four of its Duvha power station had been damaged in the course of a routine test. The major failure at Duvha power station in Mpumalanga was caused by operator error, Eskom said on Wednesday. Construction of Duvha Power Station started in November 1975 and the last unit came into operation in 1984. United States. “Unit 4 of the Duvha power station, which was damaged in the course of a statutory turbine overspeed test in February, was expected to be back in service in mid-2012.”. “The direct cause of the incident is attributed to an operating error, in that the operator did not follow the set procedure while undertaking (a) test,” CEO Brian Dames said at the release of Eskom's interim results in Joburg. Mpumalanga, South Africa. Noordhoeknic,Your knowledge is sorely lacking. [4][5] The units are over speed rated at 3600 rpm and the last recorded speed before failure was 4250 rpm. assessment and maintenance review has been conducted on Duvha Power Station Units 1 to 6 Generators. (1) Turbine bearing temperature The turbine bearing temperature changes depending on whether the rotating part and the bearing itself are normal, as well as the amount of cooling water, water temperature, room temperature, oil temperature, and the like. The investigation was conducted by a team of independent experts appointed by the insurers. Duvha power station is a base-load plant consisting of six units of 600MW each. Duvha Power Station in Mpumalanga, South Africa, is a coal-fired power plant operated by Eskom.