Anti-Scour Mattresses
Scour can occur in a surprisingly short amount of time. In fast running waters with granule solid, excessive scour can create serious structural voids, leading to excessive free spans, excessive pile exposure or other structural problems.
Pipeshield’ s Bionic Seaweed Mattress (Frond-Mat) is designed to combat scour problems. The mattresses interrupt and reduce the velocity of the near-bottom current. Transported sediment drops out due to the reduced velocity and builds up to form an embankment on and around the mattress.
Pipes and cables are not protected from scour effects, but the embankment enhances the protection and stabilisation and even permits marine life to colonise the final bank.
Effective for stabilisation and scour prevention in areas that are subject to seabed material transition embankments can be formed in excess of one metre high, in some cases within a few weeks of installation.
Fronded Concrete Mattresses (FCM’s)
Similar in characteristic to Pipeshield’ s self-anchoring P25 Bionic Seaweed Mattress (Frond-Mat) the FCM is a three-ply system pre-fitted to a concrete mattress for additional stability and impact protection. Comprising of an under netting to keep all fronds secure, an upper tear-off netting for diver/ROV activation and a protective cover for safe storage and handling, the system is unique to Pipeshield and designed in-house through feedback from our clients.
Combined with a standard or high-performance N2 Edge Bi-flex concrete mattress these fronded concrete mattresses (FCM’s) form a continuous flexible concrete barrier and are a good alternative to trenching.
Self Anchoring Fronded Anti Scour Mattress (P25)
Pipeshield have developed a Bionic Seaweed Mattress (Fronds) to combat scour problems. The Self Anchoring Type P25 mattresses interrupt and reduce the velocity of the near bottom current. Transported sediment drops out due to the reduced velocity and builds up to form an embankment on and around the mattress.
Embankments can be formed in excess of one metre high, in some cases within a few weeks of installation. Pipes and cables are not only protected from scour effects but the embankment enhances the protection and stabilisation and even permits marine life to colonise the final bank.
Pipeshield’s Type P25 Bionic Seaweed Anti Scour Mattress has been designed with transportation and installation in mind, minimising project costs.
Fronded Structures
Where scour or free span is a concern at the edges of subsea structures a bespoke frond system can be fitted to encourage self-burial in the most exposed critical areas. A build-up of sediment/ sand embankment, as a result, can help maintain the integrity of the structures resulting in increased stability and protection from scour.
