{"id":10037,"date":"2021-02-13T19:00:57","date_gmt":"2021-02-13T19:00:57","guid":{"rendered":"http:\/\/www.max-sperling.bplaced.net\/?p=10037"},"modified":"2024-02-15T19:50:44","modified_gmt":"2024-02-15T19:50:44","slug":"dive-planning-example-1-with-v-planner","status":"publish","type":"post","link":"http:\/\/www.max-sperling.bplaced.net\/?p=10037","title":{"rendered":"Dive planning (Example 1, with V-Planner)"},"content":{"rendered":"

Situation<\/strong><\/p>\n

– Diving in a buddy team
\n– Diving a wreck at 40 m for 20 min in the sea
\n– No penetration dive (deco always startable)
\n– Diving OC with just back gas (one type of gas)
\n– The only dive for that day<\/p>\n

\n

Configuration<\/strong><\/p>\n

Gas<\/u>
\n<\/a>
\n– The max. ppO2 shall be 1.4 bar, so for 40 meter we have to choose EAN28 (Travel, Bottom, Deco Gas)
\n– The deco could be shorter if another gas with a higher oxygen level would be used there<\/p>\n

RMV<\/u>: Bottom: 20 l\/min, Deco: 20 l\/min
\n– Normally the RMV is depending on the depth in contrast to the SAC, but here they just mean the SAC
\n– Varies for every person and even then it’s based on the situation (e.g. temperature, stress level, …)<\/p>\n

Descent\/Ascent rate<\/u>:
\n– Descent (surface to bottom): 15 m\/min
\n– Ascent (bottom to first deco): 8 m\/min, Deco: 6 m\/min, Surface (last deco to surface): 6 m\/min<\/p>\n

Deco model<\/u>: VPM-B (+2)
\n– Varying Permeability Model (with Boyle’s Law compensation)
\n– The argument defines the level of conservatism<\/p>\n

\n

Result<\/strong><\/p>\n

Dive profile<\/u>
\n<\/a><\/p>\n

Dive details<\/u>
\n<\/a><\/p>\n

\nGas consumption (manual calculation)<\/summary>\n
\r\nGas for Dive    = Gas for Descent + Gas for Bottom + Gas for Deco\r\n\r\nGas for Descent = RMV(0 to 40m)<\/sub> * Time(0 to 40m)<\/sub>\r\n                = RMV20m<\/sub> * Time(0 to 40m)<\/sub>\r\n                = 3 * SAC * Time(0 to 40m)<\/sub>\r\n                = 3 * 20 l\/min * 2:40 min\r\n                = 3 * 1\/3 l\/sec * 160 sec\r\n                = 160 l (\u2260 159 l)\r\n\r\nGas for Bottom  = RMV40m<\/sub> * Time40m<\/sub>\r\n                = 5 * SAC * Time40m<\/sub>\r\n                = 5 * 20 l\/min * 17:20 min\r\n                = 5 * 1\/3 l\/sec * 1040 sec\r\n                \u2248 1733 l (\u2260 1723 l)\r\n\r\nGas for Deco    = ...\r\n<\/pre>\n<\/details>\n
Description<\/u><\/p>\n
\r\nV-Planner 3,103 by Ross Hemingway,\r\nVPM code by Erik C. Baker.\r\n\r\nDecompression model:  VPM - B\r\n\r\nDIVE PLAN\r\nSurface interval = 1 day 0 hr 0 min.\r\nElevation = 0m\r\nConservatism = + 2\r\n\r\nDec to\t40m\t\t(2)\tNitrox 28\t15m\/min descent.\r\nLevel\t40m\t 17:20\t(20)\tNitrox 28\t1,39  ppO2,  36m ead\r\nAsc to\t15m\t\t(23)\tNitrox 28\t-8m\/min ascent.\r\nStop at\t15m\t  0:53\t(24)\tNitrox 28\t0,70  ppO2,  13m ead\r\nStop at\t12m\t  1:00\t(25)\tNitrox 28\t0,61  ppO2,  10m ead\r\nStop at\t9m\t  2:00\t(27)\tNitrox 28\t0,53  ppO2,  7m ead\r\nStop at\t6m\t  5:00\t(32)\tNitrox 28\t0,45  ppO2,  5m ead\r\nStop at\t3m\t  7:00\t(39)\tNitrox 28\t0,36  ppO2,  2m ead\r\nSurface\t\t\t(39)\tNitrox 28\t-6m\/min ascent.\r\n\r\nOff gassing starts at  23,9m\r\n\r\nOTU's this dive: 35\r\nCNS Total: 13,9%\r\nGas density: 6,0g\/l\r\n\r\n2636,6 ltr  Nitrox 28\r\n2636,6 ltr  TOTAL\r\n\r\n\r\nDIVE PLAN COMPLETE\r\n\r\n*********   WARNING & DISCLAIMER  *********\r\nThis V-Planner generated dive schedule could indirectly kill you.\r\n...\r\n<\/pre>\n
\n
Implication<\/strong><\/p>\n
Reserve<\/u>
\n– The calculated amount of necessary breathing gas is without any reserve yet
\n– You can get the necessary values from the Dive details table (they are rounded)<\/p>\n
The worst case you should be prepared for is if one of you lost all their gas right before the deco.<\/p>\n
\r\nReserve                = Gas for Deco (SAC of buddy, here it's the same)\r\n                       = Gas for Dive - (Gas for Descent + Gas for Bottom)\r\n                       \u2248 2637 l - (159 l + 1723 l)\r\n                       = 755 l\r\n\r\nGas for Dive + Reserve \u2248 2637 l + 755 l\r\n                       = 3392 l\r\n<\/pre>\n
This should definitely be rounded up, cause the gas consumption will be increased in an emergency.<\/p>\n
Tanks<\/u>
\nA good choice would be a double pack of 12 l tanks at 200 bar (finishing at 50 bar).<\/p>\n
\r\nGas in Tanks (200 bar to 50 bar) = 2 * 12 l * 150 bar = 3600 l > 3392 l\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
Situation – Diving in a buddy team – Diving a wreck at 40 m for 20 min in the sea<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false},"categories":[20],"tags":[],"_links":{"self":[{"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=\/wp\/v2\/posts\/10037"}],"collection":[{"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10037"}],"version-history":[{"count":1,"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=\/wp\/v2\/posts\/10037\/revisions"}],"predecessor-version":[{"id":16666,"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=\/wp\/v2\/posts\/10037\/revisions\/16666"}],"wp:attachment":[{"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10037"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10037"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10037"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}