Subtech Inshore Majuba Sluice Gate Repair
Majuba is a coal-fired power station located between Volksrust and Amersfoort in Mpumalanga. Owned and managed by Eskom. With an installed capacity of 4110 MW, it is the second largest power plant in the county. The plant is situated in close proximity to a raw water dam from which it draws water for its cooling towers. The flow of water from the dam is controlled by a sluice gate on an intake tower leading to a piping manifold. Eskom was in the process of beginning maintenance on the piping manifolds downstream from one of the sluice gates when it became apparent that the sluice gate had become damaged. The cause and extent of the damage to the gate was unknown.
Subtech Inshore was awarded the inspection contract to determine the extent of the damage and offer an innovative solution. A team was mobilised and upon inspection, it was revealed that the entire gate assembly had broken off from the intake tower. After consulting with Eskom the decision was made to remove the gate and penstock to determine whether or not the gate assembly could be reused. After a successful removal and a thorough surface inspection, the team determined that only the penstock shaft was damaged and that the gate assembly could be re-installed.
A detailed plan to complete the repair was submitted to Eskom and has since been approved. The team is currently awaiting confirmation as to when the repairs and re-installation can occur.