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VPM model in detail
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The Commercial Diver edition of V-Planner, is a special build for use in surface supplied commercial diving operations. It is purpose built with commercial ops in mind: it has these additional features:
* Prints out plans in a work sheet format - for dive supervisor use.The initial version of Commercial Diver, is approved by the Danish Maritime Authority for use in commercial diving ops. At HHS Software, we can create other special builds and changes per your requests, or for other versions seeking further approvals. Email us here.
V-Planner is a decompression program that uses the Varying Permeability Model (VPM-B) for decompression profiles. VPM-B is the latest decompression model that is well suited to today's technical diving. The deco profiles will start deeper than traditional models, accounting for micro bubbles, giving a better decompression.
Bubble models are quickly becoming the way of the future for technical and deep diving. At their core, bubble models use math to simulate and measure micro bubble growth, and set limits accordingly. The output of a bubble model is remarkably similar to many established deep practices such as Pyle Stops, Pearl divers, Florida cave practices and others. At the recent Deep Stops Workshop, presentations from Comex and USN researchers among others, showed that the bubble model style profile is the preferred approach to decompression.
In VPM-B, ascent ceilings are determined on allowable gradients for bubble formation rather than M-values. These super saturation gradients are determined by tracking sets of VPM nuclei (bubble seeds) of a certain initial critical radius. These are the microscopic physical structures that stabilize free phase gas and that can grow into full fledged bubbles when the super saturation gradient is sufficient to probe the laplace condition for bubble formation.
The Varying Permeability Model was originally developed by Yount and Hoffman in 1986. It was further developed by David Yount, Eric Maiken, and Erik Baker from 1999 to 2001. In 2002, after considerable diver feed back, the model was further developed by Erik Baker, to the current VPM-B model. The V-Planner program was developed by Ross Hemingway, and presents the VPM-B algorithm inside a complete and useful Windows dive decompression program. See also... Varying Permeability Model (VPM) References
Please note - this program is made with the experienced and technical diver in mind. If you're relatively new to diving, you may find this program difficult to use. You're expected to know the theory behind the diving practices and procedures used here.