Alfa Laval ups the pressure

22 Jan 2015
The solution has been modified in response to rising jacket water pressures

The solution has been modified in response to rising jacket water pressures

Alfa Laval’s AQUA Blue freshwater generator is now available in a stronger configuration that withstands considerably higher jacket water pressures.

Jacket water cooling systems have changed over the years when it comes to two-stroke engines as a result of slow steaming. The changes have been aimed at preventing cold corrosion in the engine cylinder liners, but have also resulted in higher jacket water pressures. Where four bar was the previous standard, pressures of five bar or more are common today.

Alfa Laval’s freshwater generator uses 3-in-1 AQUA plate technology that allows evaporation, separation and condensation to occur within the same plate pack, meaning only half the seawater flow and pumping energy are needed. The solution has been modified in response to rising jacket water pressures.

“Jacket water pressures will likely continue to rise,” said Alex Jönsson, regional business manager responsible for marketing AQUA Blue. “When MAN increased to five bar, many suppliers of freshwater generators assumed they could stretch the boundaries a little, and thus avoid making major changes. Since then, Wärtsilä has gone up to six bar.”

The company says it was prepared for even higher jacket water pressures from the start, despite having the Alfa Laval JWP-26 freshwater generator that can operate at five bar.

Alfa Laval says it hopes the greater strength of the high-pressure option, in addition to the system’s already compact construction, will also increase the attraction of AQUA Blue for shipyards since the stronger configuration will simplify the design of large vessels with a deep draught.

“Because of its pressure abilities, the new option will allow AQUA Blue to perform optimally even when much of the ship is below the waterline,” says Jönsson. “This combines with the minimised footprint and service area to make AQUA Blue a truly flexible option for shipyards as well as ship owners,” added Mr Jönsson.

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