Testing beyond IMO

Wilhelmsen Technical Solutions says that there is general concern in industry about insufficient information on the operation of ballast water treatment systems (BWTS) in real life conditions. The company took this into consideration during the IMO testing of the Unitor BWTS.

According to Wilhelmsen, in order to make a test more difficult, one can either make the test conditions more demanding, or use more challenging test methods. Wilhelmsen says it, and Resource Ballast Technologies, the  technology provider for the Unitor BWTS, did both.

The IMO BWTS test protocol specifies ‘challenge water’ conditions. These detail the minimum numbers of various organism types and water characteristics, such as suspended solids, per unit volume in the water that must be tested. In the land-based testing of the Unitor BWTS, where the challenge water make-up could be controlled, the parameters were set far above the minimum requirements. Despite testing at multiple times the required level, the system met IMO’s D2 performance standards.

One demanding testing method employed was the use of a FlowCAM for analysis during shipboard trials. In parallel testing it was found that the FlowCAM recorded higher organism counts than those found when the samples were sent to a laboratory for analysis. It is thought that this is because some organisms died in transit. Wilhelmsen believes that few, if any, other systems have been subject to such stringent shipboard analysis.

The Unitor BWTS is a fully inline system treating ballast water on intake only. With what is claimed to be one of the smallest footprints and lowest power consumptions in the market, it is said to be a flexible and economical solution for both newbuilds and retrofits.


Great anniversary year – 60 years of Geislinger & 25 years of “Gesilco®“

Geislinger GmbH, located in Salzburg, Austria, celebrates its 60th anniversary this year which coinc... Read more


Expanding its global presence, MyTaskit has signed its first international reseller. Auckland, New Z... Read more

Vickers Oils are pleased to welcome Ian Bower, Business Development Manager and Esther Murray

Vickers Oils are pleased to welcome Ian Bower, Business Development Manager and Esther Murray, Marke... Read more


After replacing the all-rubber cutlass bearing of his new Jeanneau Sun Fast 35 Tide The Knot a frust... Read more


A mid-ocean loss of steerage due to a faulty rudder bearing wasn't a scenario Luke Fisher wanted to ... Read more

Experts Highlight Viable Power and Propulsion Solutions for Next Generation Vessels

Lithium-ion battery expert Dr John Warner is presenting at the NEXT GENERATION Marine Power & Propul... Read more

View all