Subcon is pleased to announce the award by Woodside of a contract for the supply of frond mattresses for freespan correction.  Subcon’s design enables freespan correction by implementing their Active Anti Scour (AAS) frond mattress system.

Subcon Frond Matt

Subcon’s Managing Director, Matthew Allen, said, “at Subcon we’ve been developing solutions that aim to change the conversation around freespan correction. Our AAS Frond Mattresses mean our clients can survey and rapidly rectify low height spans as they go, rather than having to conduct expensive analysis and remobilise the vessel. Our AAS demonstrates our commitment to developing systems that reduce the cost of installation which is vital in the current low oil environment. Our engineers are continually finding better ways to support our clients in their IRM programs and we’re very proud to be supported by Woodside who continue to show their commitment to local innovation and jobs through this contract award”.

Subcon’s AAS Frond Mattresses provide active support at the mid span points by promoting sand deposition as well as providing scour propagation protection at the span touch down points by preventing the span from propagating along the pipeline. For more information go to

Subcon is the leading international provider of Marine Foundation and Seabed Stabilisation solutions with offices in Australia, Singapore, China and Belgium.