Sep 22, 2022 | Water & waste management news

Langh Tech’s one-way ballast water management system (BWMS) has become the first UV-based system to receive US Coast Guard type approval for one-way treatment.

Four months after successfully completing IMO type approval, the Finnish marine technology manufacturer Langh Tech now has US Coast Guard type approval for its LanghBW system. The system is based on fine filtration combined with UV treatment with an innovative reactor design allowing easy maintenance and installation flexibility.

LanghBW was among the few systems receiving approval for treating marine water only at intake in IMO areas, allowing free deballasting without energy being needed for treatment.

Langh Tech Product Manager Kim Tervonen said: “We are proud to announce being the first maker to have one-way treatment also approved by USCG, significantly reducing time and energy needed for ballasting operations. This feature is especially impactful when operating in turbid waters where systems often need to restrict flowrate and treatment can take a long time both during ballasting and deballasting. With one-way treatment there are none of the restrictions typical for UV systems when deballasting, allowing even deballasting by gravity.”

While one-way treatment provides the most significant reduction in operating costs by directly cutting the energy consumption of the system, it also increases the lifetime of the main consumable, the UV lamps, since they do not need to be ignited for deballasting operations.

The approval includes models LanghBW300 and LanghBW600 for treating ballast water up to 300m³/h and 600m³/h respectively, with models up to 1500m³/h scheduled to be added to the approval by the end of 2022. The UV-reactor is claimed to be unique in the way it can be opened for cleaning.

Langh Tech Design Engineer Joakim Keihäs said: “All of the UV-lamps with their protective quart sleeves will slide out from the reactor in a cassette, you can think of it as if pulling out a drawer, no tools needed. This allows system operators to easily clean the lamp sleeves manually, which in our experience is the most reliable way to get them fully cleaned. After cleaning you just push cassette back in and you are good to go, the whole cleaning operation taking only a few minutes.”

Langh Tech is a green tech company that designs and manufactures SOx scrubber systems, water treatment systems for closed loop scrubbers and Ballast Water Management systems. The company is one of the Langh group, which includes ship owning Langh Ship, steel carriage and bulk containers from Langh Cargo Solutions and Industrial and Ship Cleaning Services Hans Langh.

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