Cofferdam – ABC Diving

Complete Diving Services to Vessels & Civil Engineering Industry

UNDER WATER BLANKING & COFFERDAM

In-water repair is a cost-saving alternative to dry-docking and the only possibility in case of emergency.

We have a range of different products:

We provide a fast response afloat for any seawater inlets or outlets below the waterline:

Pneumatic Plugs with Bypass quickly inserted, Size Range (ø mm): 90-125; 125-175; 175-225; 205-255; 225-325
Custom-made cofferdams

We are able to intervene following hull damage, cutting and replacing a portion of the hull sheeting underwater:

Custom made cofferdam for replacing a section of hull plating 8 meters below the waterline at the bow of a 208 meters container ship
DNV approved.

Cofferdams fall into three main categories:

I.

Fully enclosed ‘top hat’ type cofferdams used for a variety of repairs where an area needs to be sealed off from the sea or water environment.

II.

Man entry cofferdams used where engineers or technicians need to have dry access to equipment that cannot be repaired in the wet.

III.

Open bottom or hyperbaric cofferdams used where a dry space is required to carry out a repair below water, but that can be carried out by a trained diver.

Applications for cofferdams

Applications for cofferdams are as wide and varied as can be imagined and typically include:

I.

Permanent Class approved insert plate hull repairs

II.

Replacement of hull mounted fittings i.e. logs, sounders, gate valves, etc.

III.

Replacement of stern seals

IV.

Repairs to concrete structures i.e. docks, jetties etc