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Technical documentation

Perma skirt has been approved as permanently attached supplementary equipment by the Norwegian engineering and certification company Aquastructures. It is verified that perma skirts satisfies the requirements set in NYTEK Regulation and NS 9415: 2009. Drawings, calculations and designs are examined. The equipment is evaluated and documented for use within the specified limits of Aquastructures AS in:


  • Technical report:
    Analysis of perma skirt for Botngaard. Doc no. TR-30678-1751-1
  • Technical report:
    Methodology for modelling perma skirt for Botngaard. Doc no. TR-30678-1751-2


Permeability of perma skirt

Water penetration through the fabric is examined in a separate test at the US Naval Academy in Annapolis, Maryland. The test showed that the fabric lets through 285 litres per m² per minute at a flow rate of approximately 17cm/seconds at a right angle to the fabric. If the flow rate is higher, more water will pass through and opposite at lower flow speeds it will pass through less water.

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