Bringing UV to the high ballast dependent market

Individual PureBallast 3 systems will handle ballast flows of 300, 500, 750, 1000 (pictured) or 1,500 m3/h, and the systems will have IMO revised G8 approval or U.S. Coast Guard (USCG) type approval. Individual PureBallast 3 systems will handle ballast flows of 300, 500, 750, 1000 (pictured) or 1,500 m3/h, and the systems will have IMO revised G8 approval or U.S. Coast Guard (USCG) type approval.
Industry Database

Alfa Laval is targeting the high ballast dependent bulker market with its new PureBallast 3 bulker-fit launch.

Hakan Persson, Manager Business Development and Marketing for Alfa Laval’s PureBallast business, outlined the advantages of the company’s new PureBallast 3 bulker-fit ballast water treatment (BWT) system during an interview with The Motorship at Marintec in Shanghai in December.

The product was launched to the Chinese market on 3 December at Marintec, and will be launched to the the global market in Q1 2020, Persson said. The first delivery of a PureBallast 3 bulker-fit system is due in April 2020.

The product is an adaptation of Alfa Laval’s UV ballast water treatment system designed for the bulk carrier market. Until now, shipowners in the bulk carrier market have favoured electrochlorination systems over UV ballast water treatment systems.

However, shipowners in a number of other large ballast water flow segments have shown increasing interest in UV BWT solutions, and Alfa Laval has received “a lot of interest” from shipowners.

An UV solution for bulkers

One of the unique characteristics of bulk carriers is their ballasting and deballasting profile, with bulk loaders permitting loading at up to twice the speed that bulk carriers unload.

“This means deballasting can occur at twice the ballasting speed,” said Hakan Persson. The Motorship notes that pump rate requirements for bulk carriers can range up to 3,000 m3/hour for Capesize vessels.

One of the advantages of the PureBallast 3 bulker-fit BWTS is that it separates the treatment and ballasting functions, by independently dimensioning the reactor and filtration capacities.

The filter stage is only needed during ballasting, and can be dimensioned for the slower ballasting flow. “We are achieving savings using the same system simply by improving the configuration of the filter,” Persson noted, giving the example of how two pumps can be used during deballasting, while only one pump might be required during ballasting.

This not only reduces Opex significantly but also lowers the investment costs of the system. The system will be available in a range of deballast flow-rate capacities ranging from 600 to 3,000m3. Individual systems will handle ballast flows of 300, 500, 750, 1000 or 1,500 m3/h, and the systems will have IMO revised G8 approval or U.S. Coast Guard (USCG) type approval.

The reduction in the system’s equipment size requirements has also allowed the system’s footprint to be reduced further, improving the engineering and installation costs, Persson added.

A PureBallast 3 bulker-fit system with a 1,500m3/h ballasting capacity would require two 650kg reactors, each with a 205 litre volume, along with a 1.1 tonne, 480 litre filter.

The Motorship notes that the ability to differentiate between ballasting and deballasting flows also represents a competitive advantage against a number of electrochlorination systems, many of which employ neutralization during deballasting.

Other bulk operators have identified Alfa Laval’s automatic Cleaning-In-Place (CIP) process, which cleans the quartz sleeves and UV sensor after ballast operations, as a key advantage of its system.

Alfa Laval’s BWTS also offers a number of other advantages, including chemical-free operation, the elimination of corrosion risk and superior performance at low salinities and temperatures.

Flow regulation

The PureBallast 3 bulker-fit configuration makes use of an external flow control in addition to the system’s own flow regulating valve. PureBallast 3 produces an external feed control output signal, which is intended as a setpoint signal for either the ballast water pump via a variable frequency drive (VFD) or a control valve installed before the ballast water treatment system.

A differentiated approach

The introduction of the PureBallast 3 bulker-fit solution is only one part of a broader strategic plan, which is based on listening to customer requirements. This has led to the introduction of a number of vessel-type specific solutions in order to maximise the system’s efficiencies.

One such example was the launch of a solution for MRT tankers, which frequently feature submerged pumprooms. The PureBallast 3 deckhouse solution integrated a booster pump unit, providing a solution that met the space and pressure requirements of the vessel type.

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