Thrust Maritime have two DNV approved A-Frames available for rent; they are identical and have a 50t SWL (design load of 82t, which allows for a 25t SWL capacity when carrying people). They are fully certified to DNV 2.22 Lifting Appliances for use in the Offshore environment.
The A-Frames' primary use is for the recovery of HRC's (Hyperbaric Rescue Chambers) and SPHLs (Self Propelled Hyperbaric Lifeboats).  Although they can be used for a varierty of other purposes, including:
  • Recovery and deployment of large subsea assets
  • Deployment of concrete mattresses;
  • Deployment of subsea structures;
  • Core sampling;
  • ROV deployment.
The A-Frames have been designed to suit a wide variety of vessels allowing rapid installation.  Typically the A-frames are fitted to Anchor handlers (AHTS), or Platform Supply Vessels (PSVs), although they can also be fitted to smaller lighter vessels.
The A-Frames are formed in modular sections allowing efficient mobilization on a B-double truck or open top 40ft container.
The slideshow to the right details typical installation steps.  Installation normally takes 2-3 days.
We have a specialist team to engineer the interface to the host vessel.  Normal connection detail is either through side bolting with welded bolt plates.  As part of this process we conduct structural, motion and stability analysis for the host vessel.  We then generate installation drawings, procedures and a supporting integration design report.
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