DOP Submersible dredge pumps

Hydropower dam cleared using DOP150

Location: Hydroelectric power dam, Yunnan Province, China
Period: Q3/2020
Product type: DOP150 with sand mining head
Owner: n.n.
Hydropower dam cleared using DOP150

In the Panlong River, in the Chinese Yunnan Province, a concrete-face rock-fill dam has been constructed about a decade ago. This dam, named the Malutang Dam, is used for hydroelectric power generation.

The reservoir created behind the 156 m high dam has a volume of some 8,000,000 m3. As the Panlong river transports sediment into the reservoir, the site needs maintenance dredging.

The dam’s gates, or water inlets, to the power house had filled up due to the sedimentation. The material built up in from to the dam ranged from silt and medium sand to gravel between 5-50 mm.

The DOP150, fitted out with its standard sand mining head, was used for the dredging activities. These activities included the removal of a 12 m thick layer of sediment. The dredging job started at -35m, and was concluded at a dredging depth of -47m – freeing the water inlet gates.

The DOP150 continuously pumped some 600 m3/h of mixture, at a mixture concentration ranging from 20% to 35%.

The sand dredge pump is hydraulically powered requiring max 80kW.

The maintenance job was finished well on schedule, enabling the Malutang hydropower
dam to maximise its output, being on the average 1,800 GWh per year. Moreover the safety ducts were fully operational again.