When sediment is heavy or toxic gas is present, the safest method is a dredging robot that enters the pipe, breaks up and crushes the sediment and extracts it, with a surface suction truck for hauling. No man-entry is required, eliminating confined-space risks such as hydrogen sulfide exposure.

Our delivered models can work inside 450mm pipes (the three-track crawler suction robot with tracks that adapt to 450-600mm). Heavy-duty models are available for 800mm+ pipes. For special diameters, contact us for a custom evaluation.

Mechanical suction dredging robots are the best answer. In one Hong Kong project — where water jetting was explicitly banned — a 450-600mm crawler suction robot working with a suction truck completed the job with a pull force of over 200kg.

Yes. For wet wells full of tangled waste (snack wrappers, gloves, socks), we add a pre-pump intake grid with a cutter roller brush that shreds the tangles before pumping. This configuration was delivered for a Singapore project covering 72 ageing pump stations.

No. For saline conditions — such as cities where seawater is used for toilet flushing, like Hong Kong — the entire machine is built from 316/316L stainless steel for long-term corrosion resistance.

Yes. In the Singapore project the robot had to be lowered from basement level 2 through a hatch right against the wall where no ordinary crane could be positioned. We designed a custom compact manual hoist specifically for this deployment.