FEATURE SPONSOR
UNEXPLODED ORDNANCE
28 items of UXO were safely disposed using its innovative ‘Barracuda’ UXO disposal system, allowing the construction to continue in earnest and preventing the costly delays that mismanagement of UXO risks can lead to.
INNOVATIVE DETONATION SYSTEM
JFMS developed an innovative detonation system, the Barracuda, a self-filled charge containing just 1kg of plastic explosive, which keeps costs low and minimises environmental impact. Following any detonation, debris is removed from the seabed and post- clearance surveys performed to confirm the state of the seabed.
Safety, both to human and marine life, is of paramount importance to JFMS and measures are taken to reduce any impact to marine life. Team safety was ensured by using ROVs as well as the implementation of a no-touch policy, meaning that the ROV, diver or Barracuda system must not touch the target being detonated.
HINKLEY POINT C PROJECT For the Hinkley Point C project a similar approach was used by JFMS, this time in conjunction with the Royal Navy, to ensure the proposed area for the seawater cooling system outfall pipe from the nuclear power station was clear of similar munitions. The campaign saw the investigation of 120 underwater objects, with the identification of a variety of targets including five WWII bombs in the highly tidal and low visibility waters of the Severn Estuary, UK.
JFMS was proud to receive the ‘Best Construction Supplier 2017’ award by EDF Energy for its professional, efficient and safe project delivery.
James Fisher Marine Services
ACCURATE UXO TARGET
IDENTIFICATION Unexploded Ordnance continues to be a major issue with the ongoing development of most offshore windfarms
UXO identification, subsequent physical investigation and de- burial affects all subsea aspects of a windfarm development from the platforms themselves through to inter- array and export cabling. This is not just a possible time delay issue but also a possible major cost issue.
Current electromagnetic technologies tend to identify many targets in any subsea and sub-seabed survey but a large amount of them tend to be ghost targets ie something that is not actually a UXO but could be anything from a coke can to an anchor. Worse, they have no accurate means of identifying size, mass, orientation, likely weight or, most importantly, target depth of burial. Accurate depth of burial is crucial as, generally, the deeper the target is buried, the more costly it is to physically investigate, recover it or destroy it.
IDENTIFICATION – THE KEY In 2016 PanGeo Subsea recognised that more accurate UXO target identification would lead to a lesser number of ‘real’ targets requiring subsequent investigation, which, in turn, reduces the overall costs involved with dealing with UXOs on offshore windfarm development.
PanGeo Subsea thus offered its Sub Bottom Imager (SBI) technology which can be deployed from an ROV, be pole mounted, crane mounted or even towed on the sea surface so it can deal with virtually any potential offshore windfarm location.
It has also been successfully used in UXO surveys on such projects as the London Thames Tideway sewer construction where dealing with many targets could have greatly delayed construction.
OTHER BENEFITS Another of the SBI’s major advantages over the more conventional UXO survey equipment is its ability to identify natural geohazards such as boulders at the same time as carrying out a UXO survey thus reducing the requirement for what was previously two separate surveys down to a single survey.
Such has been the uptake of the SBI that, by late 2017, PanGeo Subsea had been awarded their 20th UXO Survey.
PanGeo Subsea
www.windenergynetwork.co.uk
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