Customized Dredging Rig for Underwater Pipe Maintenace


DRAGFLOW designed and delivered a solution to one of the largest contractors in the oil and gas industry. The challenge was to remove sand from the seabed uncovering oil pipes, to allow proper maintenance, and finish the job by covering back the pipes with sand.

DRAGFLOW specialty has always been the capability of designing equipment according to customer's needs. Our engineers analyze the system conditions and requirements and design adequate solution.

We design and built a system that includes two Hydraulic Pumps model HY85 attached to a steel frame with a protective shield. This shield covers the pipe of approx. 1 m diameter. This symmetrical and reversible system uses a special version of our classic HY85 pumps, modified for increased performance. The solution is unique and can be used in different ways according to specific needs.

Every pump is assisted by two attached Hydraulic Excavators model EXHY20

The contractor will use this hydraulic system in a project at the Caspian Sea, Kazakhstan.

The whole project has been thought paying great attention to the severe climatic conditions, static and dynamic strains and to the restricted space for operations.

The system can be easily moved along the whole length of the pipes lying on the seabed, to complete the sand extraction. Once the maintenance is over, the same equipment will put the sand back to cover the pipes. 

By working in close coordination with the client, DRAGFLOW designed an optimal solution and built the right tool for this application.

This solution includes two HY85/180HC, four Hydraulic Excavators EXHY20, and the customized structure.