Underwater services in Norway

Kristiansand Bygg is a Norwegian contractor with a specialty in underwater services.

Our team consists of craftsmen in several selected disciplines. When you choose us for underwater services, you get craftsmen who can dive, not divers doing craft. Our reputation means everything to us, so we are always careful to deliver the highest level of quality.

Kristiansand Bygg AS holds DNV Approval of Service Suppliers (DNV-CP-0628, certificate AOSS0000S13) for In-Water Survey by diver and remotely operated vehicle, valid until 30 March 2029.

Hull cleaning

The performance of the hull refers to the relationship between the condition of a ship’s underwater hull and the power required to move the ship through water. with a large degree of deterioration on the hull and propeller, fuel efficiency will decrease.

According to IMO Marine Environment Protection Committee (MEPC63), deterioration in hull & propeller performance accounts for 10% of world-fleet fuel costs and GHG emissions. Therefore, investing in underwater services will greatly reduce emissions and cost.

• We use methods that are adapted to the antifouling coating, -and marine fouling type.

• We will always choose the least aggressive cleaning system that will effectively remove the fouling.

• We clean flat Bottom, vertical sides, sea chest grids rudder and all niche areas such as Bilge keels, Dock keel blocks, etcetera.

Propeller polishing

Barnacles or tubeworms on the propeller will cause a severe loss in the propeller propulsion efficiency. The way to fix this problem is removing all calcium deposits using propeller polishing.

Our divers use gentle methods to clean the propeller, as not to harm it in any way. A polished propeller will be clean and efficient.

Underwater inspection

Underwater inspections ensure safety and structural integrity of a vessel. By assessing the hull condition and observing the condition of the antifouling paint we can report the underwater status of the ship. We carry out In-Water Surveys (IWS) of ships with our own commercial divers and ROV. An In-Water Survey is an inspection of the hull and underwater parts of a vessel while it is afloat. Underwater Inspection in Lieu of Drydocking (UWILD) is a related arrangement in which a classification society may accept an in-water inspection in place of dry-docking for a periodic survey.

We perform In-Water Surveys in Southern Norway, including Kristiansand, Stavanger, Arendal, Grenland, Larvik, Sandefjord, Drammen and Oslo.

Book your In-Water Survey early. An early inspection gives you the true condition of the hull, propeller, rudder and sea chests while there is still time to plan, so repairs, cleaning and class requirements can be scheduled around your vessel's operation instead of against it.

Every inspection is documented with high-quality photos and video from our divers and ROV, giving your class surveyor a clear, reliable basis for the survey. We can also offer a live two-way video feed so your class surveyor can follow the inspection in real time.

This report will help the responsible personnel ashore, and onboard to make good and correct operational decisions whiles planning voyages and maneuvering the ship.

Request an In-Water Survey in Southern Norway

For an In-Water Survey enquiry, please provide the vessel name and IMO number, classification society, port of call and preferred inspection date.

Ship repairs

Our high quality technical underwater repair solutions are performed in almost any Norwegian port.

Some of the repairs we can provide:

• Welded crack repairs

• Rudder repairs

• In water propeller repairs

• Bilge keel cropping

• Rudder repairs

• Underwater welding, cropping, grinding, and profiling

• Cathodic protection (anode) inspection and replacement

• Thruster and sea chest cleaning and repairs

• Underwater opening inspection and repair (sea chests, thrusters, valves)

Please contact us if you have need for repairs on any seagoing vessel. the list shows examples and does not represent all our areas of expertise.

Kristiansand Bygg AS is your provider of underwater services in Norway, with our own commercial divers and ROV. Our divers work with surface-supplied equipment (umbilical) down to 50 metres. In the Grenland ports, Porsgrunn and Herøya, Brevik and Stathelle, and Langesund, see our page for diving and hull inspection in Porsgrunn, Brevik and Langesund. In the Stavanger area, including Risavika, Tananger, Dusavik and Mekjarvik, see our page for commercial diving and hull inspection in Stavanger. You are welcome to contact us for more information about our services. For diving services in Norwegian, see our dykkertjenester page.