Basic Engineering, Detailed Engineering and Construction Management of an ash slurry transfer system between Kriel and Matla Power Stations
Kriel Power Station is a coal-fired power station consisting of six units that produce a combined base load of 3000 MW. Ash is produced as a waste product of burning coal and is disposed of at the Kriel Ash Dam Complex. The Ash Dam Complex consists of three ash dams that have recently become unstable. This resulted in the need to transfer the ash produced at Kriel to the Ash Dam Complex at Matla Power Station. Water will be used to transport the ash as a slurry mixture to the required location. All water transferred with the slurry mixture must be returned to the Kriel Ash Water Return (AWR) dam via the solution trench and return water system.
EPCM Consultants (Pty) Ltd (EPCM) was awarded the contract to complete the basic and detailed engineering for the project.
Services provided:
The basic and detailed engineering will be required for the following:
- Four slurry pipelines from the distribution board (DB) pump station to the perimeter of the ash dam at Matla, as well as outlets at determined distribution points;
- Ash Water Return (AWR) pump house or barges and a booster pump station (if necessary) with the required auxiliaries, to promote the return of the water from Matla’s final cut to Kriel Power Station AWR dam via the solution trench;
- Maintenance access facilities for all the pumps and auxiliaries;
- Four AWR pipelines from Matla’s final cut to Kriel Power Station via the solution trench (quantity predicted by the Employer’s concept design) with the necessary instrumentation, such as valves, monitoring equipment, flow- and pressure measurement devices and indicators;
- Scale management system to prevent scale formation in the AWR pipelines to the solution trench that lead to Kriel’s AWR dam;
- Excess AWR treatment plant (if necessary);
- Daily water balance models;
- An additional AWR dam (if necessary);
- Capacity-, Operations- and Stability assessment of Matla’s ash dam;
- Geotechnical Investigations for Matla’s ash dam assessment and the pipeline route;
- Pipeline- and equipment support structures;
- Stormwater management infrastructure and road crossings over existing infrastructure;
- Access roads on both sides of the pipeline servitude for gravel maintenance;
- Access roads and an offloading facility for the delivery of the chemicals;
- Containment berms or trenches along the slurry pipelines to contain spillages;
- Collection sumps on both sides of the pipe servitude at Kriel to collect ash spillages;
- Two pipe bridges over the watercourses;
- Pipe sleeves under the Mine haul road;
- A drainage system on both sides of the pipe servitude at Matla to divert ash and AWR spillages;
- All associated Civil- and Structural infrastructure;
- All associated Control-, Instrumentation- and Electrical requirements;
Construction supervision of all activities associated with the points mentioned above
Client
Eskom
Location
South Africa
Date
2021
Contract
Engineering
