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DRIVES, CONTROLS & MOTORS FEATURE


Seaworthy drives make engineering easier for marine equipment supplier


Nord Drivesystems ensures that adequate extras and options are readily available to facilitate operation in challenging environments. This was a particular boon to Italian ships outfitter Navalimpianti, as they found that adapting drives for maritime use no longer required a great application-specific engineering effort


Navalimpianti manufactures marine equipment such as this window cleaning platform with safety rails


C


omponents and systems for maritime applications must be especially rugged and


durable because of their continuous exposure to a moist, salty atmosphere. In addition, suitability for widely differing operating temperatures becomes necessary for ships that pass through several climate zones. Before turning to Nord, Navalimpianti, an experienced Italian marine equipment provider, used to individually select and procure all required equipment, including electric drive components. All configurations and adaptations of the drive solutions were done in-house to comply with rigorous demands and to ensure a totally reliable performance. This process required a very substantial effort, but all of this changed almost instantly when Navalimpianti found that Nord Drivesystems was able to flexibly


implement the required options from their standard catalogue, and can supply suitable drive systems anywhere in the world. Navalimpianti not only found the high gearbox quality and reliability more than satisfactory, but especially appreciated the German drive manufacturer’s readiness to implement specifications such as IP66 ingress protection or stainless-steel output shaft fittings. A number of other application-specific features were then jointly defined by the customer and Nord. The company’s engineers were able to draw on decades of experience, advising on the optimum drive selection and configuration.


RAIN OR SHINE - DRIVES MOVE SKYDOMES Individually designed for each ship, Navim Skydomes are a standout product in the portfolio of the experienced passenger vessel


outfitter. These elegant sliding glass roofs are composed of numerous movable segments and are equipped with a motor. When they are completely closed, they keep out wind and rain and enable air conditioning of the upper deck. The glass roofs add value to any cruise ship because they allow the year-round use of outdoor swimming pools, which are among the main attractions for many travell ers. They are opened and closed gently and quietly by specially configured Nord drives. Two or four parallel-shaft geared motors are used depending on the span and weight of the roofs. In addition to a high resistance to maritime climates, these drives must withstand the chlorine-saturated atmosphere around the pool. Notably, they must ensure failure-free operation for many years, because once the roof is installed, the drives are not easily accessible for maintenance or repairs.


DRIVE OVER BOARD - WINDOW CLEANING ON THE HIGH SEAS Moving window cleaning platforms into position is another task Nord drives takes care of. “We are outfitting two ships right now,” says Silvano Lonzar, chief designer at Navalimpianti, “one with six and one with seven motorised window cleaning platforms for the ship’s right, left, and stern side.” Four bevel and worm geared motors per window cleaning system, power the winches that move the platforms horizontally along. The worm-geared motors are self-holding and therefore need no brakes to stop. The fans of the vertically installed motors are protected


from rain ingress by double canopies. Further safeguards in this outdoor application and its salty and chlorine-saturated atmosphere include terminal boxes, sealed with epoxy resin and stainless steel hollow shafts. A five-layer coating for offshore operations with sturdy multi-component paints ensure class C5 corrosion protection according to EN 12944.


SATISFIED END CUSTOMERS Over the years, Nord systems used in Navalimpianti’s products have proven their mettle in numerous installations. The drives can be directly installed and put into operation by the OEM, without any extra engineering effort. With the company’s solutions, commissioning has also become a smoother, more efficient process, as the drive systems do not require a separate acceptance test or end user training. “The reliability of Nord products boosts our


overall reliability for our customers,” Lonzar says. “In fact, since we have been using Nord drives, we have experienced no service calls and no drive failures. Our group image benefits greatly from that. What’ s more, Nord is able to fulfil our wishes very quickly and supply suitable solutions. In the past, we had to wait a long time until drives were delivered with documentation according to our specifications. From our experience, Nord can usually configure a standard drive from their catalogue straight away. So, the selection takes little time and the delivery times are very short. Since we no longer have to build weather-proof housings for the drives anymore, we save a significant amount of time.” Working with the Italian subsidiary of the


Nord Drivesystems, Navalimpianti can rely on the manufacturer’s global sales and service network. This, too, is important to Lonzar: “Before we chose Nord, we made sure to confirm they could supply products and materials in uniform quality around the world. In this regard, as well as in respect to cost efficiency, Nord passed the supplier selection process with flying colours.”


Sliding glass roofs for swimming pools are among Navalimpianti's developments for cruise ships


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Nord Drivesystems T: 01235 534404 www.nord.com


DESIGN SOLUTIONS | OCTOBER 2017


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