Removal of foreign object such as mooring ropes, chains, wires and tiers are usually the most common, getting tangled in the stern propeller(s)/ shaft or the bow thruster. These are removed by cutting the entangled materials away.
Sometimes it can be unclear whether foreign objects are in the propeller some indications may include but are not limited to increased vibration, auxiliary noise, rising temperature in exhaust gas, reduced speed and an increase in fuel consumption.
If left untreated the problem can rapidly progress and cause major damage to the shaft and engine as plastic can melt, break seals and work its way inside of components.
DSI can send divers to any port at short notice or even out to sea if circumstances permit. Minimizing or eliminating interruptions to scheduling, expensive repairs and possibly the cost of drydocking.
Hull inspections may be necessary after impacts or grounding. Diving Service of Iceland (DSI) is approved by the major insurers to carry out such inspections. In some cases, a ship’s dry-dock inspection may be postponed depending on the results
of the in-water inspection. Such an inspection comprises of a, survey of the hulls condition, bottom paint, zinc anodes, shaft seals, propeller, transducers, steering gear, and sea chests.
It is advisable to call for an DSI hull inspection if a ship has been grounded, or if one of the following symptoms are observed:
- A minor deformation of a propeller blade can easily cause vibrations. Frequently, the blade may be repaired by sanding
- Suspect readings by echo-sounders or other instruments using transducers.
- Unusually high temperature of coolant or exhaust. This could be caused by fouling
in sea chests/sea coolers.
- Suspicion of oil leak past oil seals.
The diver carries a camera, allowing the client to observe proceedings in real time.
A video disc is provided to the client along with a written report on the findings.
Diving Service of Iceland has decades’ long experience in replacing transducers for echo-sounders, sonars and other transducers. Transducers may need to be inspected or replaced when old instruments are replaced, or after a ship has been grounded. Questionable readings from instruments may indicate a need for
transducers to be, inspected, cleaned or replaced. Please note that transducers are
inspected and cleaned during hull cleaning and hull inspection, and reported on in a status report.
Anodes need monitoring, as they may deteriorate faster than planned for, e.g. due to poor coverage or shadowed areas, missing anodes or anodes with poor connections.
Depleted anodes may lead to extensive, fast corrosion in the ship’s hull, sea chest valves, propellers or steering mechanism with serious consequences. Without anodes, bottom paint may also flake off prematurely.
It only takes one day for a diver to weld new zinc anodes on a good size ship. The quality of the welds is very important. Underwater welding leads to more brittle welds, and such welding is only to be entrusted to experienced operators.
A diver will weld new zinc anodes to the hull. The client can monitor the proceedings in real time via a live feed and will receive a USB with recordings and a written report on the condition of anodes.
DSI can provide this service at short notice and work quickly in order to avoid expensive delays. The company can provide all anodes and other supplies required.
Diving Service of Iceland provides a propeller polishing service utilizing specialized equipment. This can be arranged without upsetting a ship’s schedule. A propeller can be cleaned during a visit to port for unloading, for example.
The equipment used is designed for brushing/polishing, and precise measurements are used for evaluating the success of the project.
In addition, we invite ship owners to make service agreements in order to ensure proper monitoring of propeller condition, and cleaning at 6-month intervals. The work is monitored by video, allowing the client to follow proceedings in real time and will receive a USB with recordings and a written report.
Rapid corrosion (ALWC) of harbor installations at low water
Anodes may be used to counter microbially influenced corrosion (MIC) associated with zero tidal level (accelerated low-water corrosion, ALWC).
Corrosion of steel constructions in harbors is a difficult problem. It can create dangers to traffic and affect all safety issues. Local, accelerated corrosion is a difficult problem to allow for in plans of maintenance and running of harbor installations.
Corrosion in excess of „standard corrosion level“ (0.10 to 0.15 mm per year), may be caused if a protective layer is removed by electric currents or by chemical pollutants.
Microbes can increase corrosion rates, especially near tidal zero level.
Unpredictable pollution events may occur in or near harbors. Commonly, these are associated with a boat sinking, a ship running aground, or a ship releasing bilge water into a harbour. Marine biota may suffer, and ships and harbor constructions may need cleaning. DSI owns gear for pollution prevention, such as oil spill booms used to isolate the polluted area, and an oil skimmer which is used to remove surface oil. This is achieved with brushes which absorb the oil which then can be pumped ashore. DSI can take this gear to any port at short notice.
Diving Service of Iceland now offers to inspect sheet piles all over the country. The inspection includes precise thickness measurements and a video recording of the inspection. A report on the condition of the sheet pile is submitted. A 200 m long jetty can be inspected in a day.
A diver carries out the inspection. All holes in the steel are measured and recorded. The diver carries a camera, and the client can watch the proceedings in real time. The video record accompanies the report.
Thickness of the steel is measured by a Tritex Multigauge Ultrasonic 5600 meter which has proved very successful in this type of work.
The measurements are made on vertical lines, spaced 5 meters apart. Up to 5 points are measured on each line. If a visual inspection suggests a need for denser measurements, the interval may be reduced to 1 meter.
Junk in harbors can damage ships and boats. DSI can map unwanted objects on the bottom, using side-scan sonar or multibeam survey. Both methods are independent of visibility and can therefore be used at any time. Most junk is to be found near piers, and objects like tires, ropes, wooden beams, steel beams and steel cables can damage propellers and steering gear. Once the distribution of junk has been mapped, divers may be deployed to clear the harbor.
Diving Service of Iceland has a long experience in salvaging ships, boats and other valuables from the sea, both in harbors and along the Icelandic coastline. We have also undertaken rescue work on land, of vehicles, snowmobiles, and other valuables from rivers and lakes. The company is the largest salvage company of its kind in Iceland and is well equipped with specialized gear and manpower for most salvation tasks.
Rapid response and experience count heavily when accidents occur, and when further damage is imminent. Diving service of Iceland has reclaimed many vessels sunk in harbors and has developed a new technology to re-float boats and thus minimize expensive work with cranes. The company utilities an oil protection fence in order to avoid unnecessary oil pollution during rescue operations. Our response time is less than 2 hours in the Reykjavik area, which we use to bring divers, powerful pumps,
inflatable floats, and booms to the site.
We team up and support international salvage teams that manage salvages around Iceland. Well equipped with whatever is needed to make a successful salvage.
In our latest project we teamed up with Ardent salvaging 4000t vessel in November 2018 – Th name of vessel was Fjordvik
Diving Service of Iceland has a long experience of work on underwater pipelines for effluents, water, and gas. We have installed large effluent pipes, up to 3000 meters in length.
We have all the equipment necessary for work of this nature, such as barges and hoisting gear. We can provide the preparatory work necessary for the installation, for example by precise mapping of the bottom for choosing the best pipeline route. We can supply all sinkers and arrange them on the bottom. We can survey the pipeline on the bottom, in order to mark it on nautical charts. We offer service contracts for regular monitoring of underwater installations by the use of divers and ROV’s.
Certified underwater welders
Our team consist of certified underwater welders with years of experience
In the pictures you can see David Keats, world leading expert in underwater welding, giving seminar to our dive team.
Steel thickness measurement
Steel thickness measurements of vessels and structure
We have two types of underwater thickness gauges, Cygnus dive 2 and Tritex-multigauge ultrasonic 5600. After the measurement detailed report of steel thickness is delivered to the customer.
Do you need to monitor steel thickness to see corrosion in time?