{"id":987475082,"date":"2024-09-15T03:59:48","date_gmt":"2024-09-15T03:59:48","guid":{"rendered":"https:\/\/courses.asiascubainstructors.com\/lessons\/decompression-theory-and-rdp-1-the-haldanean-decompression-model-copy\/"},"modified":"2024-09-16T12:52:32","modified_gmt":"2024-09-16T12:52:32","slug":"decompression-theory-and-rdp-2-dive-tables-and-planners","status":"publish","type":"lessons","link":"https:\/\/courses.asiascubainstructors.com\/de\/lessons\/decompression-theory-and-rdp-2-dive-tables-and-planners\/","title":{"rendered":"Restricted content"},"content":{"rendered":"

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Decompression theory and the RDP<\/h1>\n

 <\/p>\n

2. Dive tables and planners<\/h2>\n

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US Navy tables<\/h3>\n

The first dive tables to be widely used and adapted to recreational diving where the US Navy tables<\/strong><\/em> designed in the 1950’s. Most recreational divers and dive instructors at that time had a military background and the Navy tables were accessible for everybody.<\/p>\n

The US Navy table uses six compartments<\/em> with a slowest halftime of 120 minutes.
For surface intervals, a 120 minutes halftime is used<\/em> to calculate nitrogen release, so it takes 12 hours (720 mins. 6 x 120) to release all nitrogen.<\/p>\n

 <\/p>\n

<\/span><\/p>\n

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The Recreational Dive Planner (RDP)<\/h3>\n

In the mid-1980\u2019s, Dr. Raymond Rogers recognized that the USN tables were not ideal for recreational diving.
The US Navy divers were all male in their 20’s and 30’s and reasonably fit. They would normally make long dives that would include drills or exercises.<\/p>\n

For recreational divers that consist of all genders and age groups and would make several relaxed dives in a day, the surface credit based on a 120-minute halftime seemed very conservative. For this reason, Dr. Rogers used a 60-minute compartment to calculate surface intervals. The WXYZ rules make sure the slower compartments stay within limits.<\/p>\n

New technology (Doppler ultrasound) showed that silent bubbles often occurred when diving to the limits of the US Navy tables. Dr. Rogers suggested that lower M-values would be more appropriate for recreational divers.
With the help of DSAT (Diving Science & Technology), Rogers developed the RDP \u2013 Recreational Dive Planner<\/strong><\/em>.<\/p>\n

The RDP uses 14 compartments<\/em>, instead of the 6 used in the US Navy tables. To calculate the surface interval, the RDP uses a 60-minute halftime<\/em>, instead of 120 minutes on the US Navy tables.<\/p>\n

The pressure groups from the RDP are NOT interchangeable<\/em> with the US Navy table or with dive tables from other agencies.<\/p>\n

<\/span><\/p>\n

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eRDPml<\/h3>\n

When planning dives with the RDP it is assumed that the diver stays a the planned depth during the entire dive. The main advantage of the eRDPml (electronic RDP for multi-level)<\/strong> <\/em>is that divers can plan multi-level dives. The pressure groups on the eRDPml are the same as on the RDP. However, since depths and times on the RDP table are often rounded, calculations can have different results (there is no 19 meter on the RDP).
The eRDPml is not a dive computer and can not be taken underwater.<\/p>\n

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Dive Computers<\/h3>\n

Nowadays dive computers are the most accurate way to plan a dive. Most dive computers calculate no-decompression time using a 1-minute interval \u2013 this eliminates unnecessary rounding. In some models, the calculation interval can be changed.<\/p>\n

Dive computers can use different algorithms that are known under different names like Spencer Limits, Buhlmann, RGBM (Reduced Gradient Bubble Model). These models are essentially still based on Haldane’s original mathematical model.<\/p>\n

While dive tables use a fixed halftime to calculate the surface interval, most dive computers assume that all compartments release nitrogen at the surface at their underwater halftime rates. This is called EE washout<\/strong><\/em> (exponential absorption \u2013 exponential release).<\/p>\n

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PADI Recommendation for Diving with Computers<\/h3>\n

\u2022 Divers should not share a dive computer.
\u2022 Each diver must have his own computer and use the same computer through a series of dives.
\u2022 Computers have the same theoretical basis as tables so one is neither better nor safer than the other.
\u2022 All standard guidelines apply, such as deepest dives first.
\u2022 Follow all manufacturers\u2019 recommendations.
\u2022 End the dive based on the most conservative computer of a buddy team.
\u2022 If a computer fails during a dive, ascend slowly to 5m and make a long safety stop as long as your air supply permits. Remain out of the water for 12 \u2013 24 hours, so you can start clear again with another table or computer.<\/p>\n

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