Fartyg och off-shore

Deck covering systems

The SWEDAC Deck covering System is a method of noise control in ships, which acts by preventing vibration of the steel structure. The energy thus absorbed is therefore not available to be radiated as sound in the treated area or in other parts of the ship. Over 200.000 square meters of Swedac Deck covering systems have been installed over the past 15 years.

The viscoelastic layer forms the filling of a sandwich construction between the steel of the deck and a constraining layer of latex modified concrete or steel.

As the deck flexes under vibration transmitted to it from engines or propellers, the viscoelastic layer is placed in shear. The special property of a viscoelastic material is that it not recover at the same rate as which it is distorted, and energy from the vibration is therefore absorbed, leaving less to be radiated as noise.

Approved according to European Union Council Marine Equipment Directive (MED) 96/98 EC. BV 062

• System U1, V2 and U 10
  
  System V2: Damping layer ACM, supplied in liquid form and trowelled out on the deck to a thickness of 2 mm wet layer and constrained with SBR - latex concrete.
  
  System U 10:: Damping layer DG-U1, 2 component polyurethane, for use on aluminium deck and wet areas. Applied at 1.5 mm thickness and constrained with SBR - latex concrete.
  

  Viscoelastic Deck covering System U10 / V2

  Swedac SBR-latex concrete    Thickness: 10 - 30 mm 1,5 mm viscoelastic layer, DG-U1 or ACM. Steel deck

  System U1:

  Viscoelastic Deck covering System U1 constrained with steel sheet

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• Floating floor PVP - 2,0/3,0-50               
  
  SWEDAC PVP floor is produced from 5 mm "sandwich" steel or aluminium plate and 40 - 100 mm mineral wool Rockwool A/S Marine slab 140, Partec/Rockwool slab 337 (140 Kg/m³) or similar approved marine slab of density 140 Kg/m³.

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Structural damping

• SWEDAC Damping Cassettes
  
  Damping Cassettes consist of a U-Profile backbone into which the viscoelastic material is cast and into which individual fixation legs are imbedded. Damping Cassettes are very practical and simple to fit by welding to flat or curved surfaces and are effective on plate thicknesses from 4 - 50 mm.

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• Viscoelastic sheet VS and compound DG-U6
  
  These are heavy duty treatments, having a wide range of temperature and frequency performance. Constructions can be designed for constrained layer applications on structures such as ships bulkheads, hullsides and decks. Viscoelastic layers are typically of 1 - 2 mm thickness, constrained with the same material as the main structure of around one-quarter of its thickness.

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• SWEDAC PVP Vibration damped sheet metal
  
  Used for construction of high efficient floating floors, low noise radiating lining and improved transmission loss between cabins. Available in steel, stainless steel and aluminium.

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• SWEDAC SBR-latex concrete
  
  Ordinary mortars and concrete have a high compressive strength. However they have a low tensile strength. SWEDAC SBR-latex can minimise these deficiencies, e.g. in a typical mix of 1 part cement, 3 parts coarse sand and using 5 - 8 % by weight of SWEDAC SBR-latex, the tensile strength is doubled. A simple practical demonstration is to paint a slurry of the latex and cement, and a slurry of water and cement onto steel strips. After hardening it will be found that only the strip painted with the latex/cement can be bent without the coating flaking off. This demonstrates the improvement in adhesion and flexibility given by the latex.

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• LANAT PU System
  
  Weather resistant polyurethane compound. Can be filled with sand up to 60 volume %. The system includes antislip and UV resistant topcoats.

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