News: January 2016

The purpose of in-service underwater hull cleaning

The purpose of in-service underwater hull cleaning is to remove biological roughness
or fouling to decrease drag and weight.   Depending on the coating, the cleaning process can have the added benefit of rejuvenating the active paint layer. Proper cleaning removes all traces of fouling and does not remove or damage the coating or cause any increased surface roughness.

The most critical issue to address is when and how often cleaning should be done. A pro-active approach that preempts any type of widespread macro fouling is always warranted simply because the cost of having such fouling present outweighs the cost of cleaning by a substantial margin.

Regular cleaning of micro fouling is also often cost effective, if the correct cleaning technique is used so that the surface roughness is not degraded and the coating material is not removed.

For best results, the scheduling of cleaning should be based either on monitoring
of performance indicators (such as fuel consumption) or on regular inspections. In both cases a threshold is established that identifies when cleaning is economically justified.

For visual inspections the threshold includes the percentage of the hull surface that is fouled and the type of fouling. Regular inspection, photographs and roughness measurements would be a prudent way to monitor the impact of cleaning and the condition of the coating.  The area the vessel operates in will determine the rate and type of growth.

The solution to this critical issue is to monitor and to know the condition of the underwater hull, to understand the consequence of the condition seen, and to take appropriate action.

It is clear that regular hull cleaning reduces the hull drag and fuel consumption if it is well managed, resulting in reduced total cost. As discussed the cost of fouling (even slime fouling), is now much better understood, and if cleaning schedules are adhered to the net result is amazingly positive for the ship owner.

February 2016

Benefits of underwater hull cleaning with the CROV

SRN Group is specialized in hull cleaning and diving services in many countries worldwide.
For hull cleaning a CROV is used which is a remote operated hull-cleaning unit.
The major benefit of utilizing the CROV is that there are no divers needed to clean of the marine growth.

In the diving law a diver should only be used when there are no other possibilities available to get the job done.
The CROV cleanings are safer, quicker and can be done in most parts of the world. With the CROV handwork belongs to the past.

SRN GROUP is able to assist any shipping agencies/vessel owners in scheduled diving inspections, repairs or emergency work that may arise.  Operating from Europe and USA there is nowhere in the world that is in accessible to the SRN teams.  With transportable equipment the SRN team can be mobilized and be on the job at very short notice.  We are on call 24 hours a day to ensure peace of mind for the vessel owners and captain!

“Our vision is to be acknowledged as a strong strategic partner for our clients and our people. Head quarters of the SRN GROUP are based in Stabroek- Antwerp, Belgium.

Hull cleaning of fouling/marine growth on vessels has a positive impact on:

  • Propulsion efficiency for vessels.
  • Reduce loading and drag on vessel exceeding their designed limits.
  • Eases data acquisition for periodical non-destructive testing and inspection.
  • Releases block on water intakes and out flows.
  • Avoid possibility of exacerbated corrosion.

SRN is able to clean this fouling without damage to the paint and anti fouling.   To undertake this the company can either use its revolutionary CROV or by means of diver and brush cart.  Major international shipping companies rely on SRN to keep their ship hulls clean, which equities to a substantial reduction in the fuel bill.

Propeller polishing is carried out by SRN to reduce the drag on the propeller, which will make considerable reductions in the ship’s fuel consumption.  Polishing is done to Rupert’s scale A.

October 2017

New in Europe !!!!!



It is with great proud & pleasure to announce to you that SRN GROUP has obtained their license to offer environmental safe underwater hull cleaning in the Netherlands and the port of Antwerp.

SRN GROUP has developed and uses a remote operated unmanned underwater cleaning apparatus and reclaim system, called the “NAVIGATOR”.

Across the marine industry, it is common knowledge that a clean underwater ship hull provides significant economic and environmental advantages to all stakeholders. Despite the use of active biocidal and anti-fouling coatings, biofouling is a persistent and common phenomenon. It leads to:

  • Increase in frictional resistance
  • Weight issues
  • Reducing vessels speed
  • Increasing fuel consumption and related emissions
  • Increased risk of transfer of indigenous species (NIS) into local marine environment
  • Obstruction of regular inspections.
  • Removing this marine growth results in ‘keeping the cost down’

Operating your fleet economically and wisely is all about saving fuel and keeping your paint system intact.

The Navigator can remove bio fouling from any vessel submersed hull and separate the bio fouling residue with the reclaim system.

The Navigator is steered from the surface. Clients representative or Captain is more than welcome to witness the entire cleaning process from behind the monitor if wished.

The Navigator can be adapted to different types of brushes, which are carefully chosen after the initial fouling inspection.

Hull cleaning with reclaim system can perfectly be done at Antwerp Port or Rotterdam while vessel is fastened at dolphin buoy at Calland Cannal.

If you wish to receive more information, our team is more than welcome to walk you through. Do not hesitate and get in contact with us to get a competitive quote.

And please rest assured: the price of hull cleaning with reclaim system remains competitive.

Have a great & clean day!