TAG Diving needed to remove 9 heavily corroded 12m high aluminium posts from a reservoir that had to remain full of water and online throughout the process.

Council water reservoir

Project Description
Reservoir Post removal and replacement

Underwater drilling
Broco cutting

Equipment / Resources
Fibreglass reinforced plastic (FRP) posts
Crane lift for removal and replacement
Inflatable boat

The fibreglass reinforced plastic (FRP) posts were delivered to the site wrapped. As the reservoir had to remain online, great care was needed to keep all materials entering the water hygienic and free from any contaminants.

A crane lift was used to move the posts into position in the reservoir (all posts were disinfected prior to entering the water supply). Divers entered the tank to receive the post bases and position them correctly, communicating between themselves and the surface via comms system.

All posts were secured to the base with dynabolts and the top of the posts were secured onto the existing purlins prior to removing old posts. The old corroded posts were removed with the crane and stacked externally for removal from site.

        20 years of experience working on and in potable reservoirs enabled TAG Diving to identify and provide its clients with another “watertight solution