Rdp Padi Table
Lorri Dent
Do you also love the playful look of various sized tables together? With its design inspired by the beautiful shapes of Indonesia's famous paddy fields, the Knut Padi Coffee Table appears to exists of separate tables, while actually being one compact piece. The table is crafted of hand-braided abaca rope and reclaimed teak wood
The 1980s were when PADI truly became a leader in dive research. By taking the initiative to study diving, PADI was able to create new texts, tools, and course structures that continue to benefit the dive industry.
Additionally, offering the course after Advanced Open Water fit into the PADI philosophy of building skills gradually as the diver is ready for them, ensuring that divers already have the basics down and can truly understand and succeed with their rescue skills. Many divers say that Rescue Diver is their favorite course.
Seeing a gap in the knowledge resources available for avid recreational divers, in 1988 PADI published the Encyclopedia of Recreational Diving. This was the first comprehensive informational resource aimed specifically at recreational diving, with sections on dive physics, physiology, the environment, equipment, and special activities. Today the Encyclopedia is in its third edition.
In 1987, PADI funded the development of a new decompression model specific to no stop decompression diving. The result was the Recreational Dive Planner (RDP), introduced by PADI in 1988 as a table and The Wheel. These were the first dive tables created specifically for no stop recreational diving. Today, electronic versions of the RDP remain available and popular.
Table 1 is arranged as a set of columns, each corresponding to the depths listed across the top. The last number in each column, denoted in red, is the Maximum Bottom Time (MBT) associated with that depth. (As an example, the MBT for a dive to 70 ft. [21 m] is 40 minutes.) The goal of safe dive planning is to avoid going over your MBT which would require decompression stops.
Find the column corresponding to the greatest depth of the dive; use the next greater depth if your actual depth is not listed on the table (e.g., if your actual depth is 52 ft. [16 m], use the row corresponding to 60 ft. [18 m]).
CAUTION: Do not attempt to use the Recreational Dive Planner without first reading the Instructions for use. The Recreational Dive Planner is intended for use by certified divers or those under the supervision of a certified scuba instructor. Misuse of the Recreational Dive Planner may result with serious injury or death. Consult the instruction manual or a certified scuba instructor prior to its use. If you have any questions regarding its use, please reach out to a certified scuba instructor.
Plan on having at hand the Diving Science and Technology Recreational Dive Planner sanctioned by PADI, a Pen/pencil, and paper. If you do not have an RDP, you may click on the depictions below to expand their size.
If this is the first time you will be walking through the RDP, plan on spending about an hour for the exercises below. You may always return to this page to continue your studies of course if your time is limited.
The purpose of the recreational dive planner is to calculate for no decompression dives. For the benefit of those just learning to dive, decompression is a term used to describe an act for removing excess nitrogen accumulated in the body during the course of a dive, prior to reaching the surface. It usually means pausing the ascent at a specific depth for a specific amount of time before resuming the ascent. Decompression may occur in stages, like steps of a staircase, where with each step up the staircase there is a pause in the ascent to allow excess accumulated nitrogen time to be released from the body. The definition defined for recreational diving implies a diver never reaches the state of decompression and may reach the surface without the obligation to pause the ascent to release excess accumulated nitrogen. The RDP facilitates the proper planning and management of time, and depth to be sure dives are within recreational limits.
In addition to the recreational dive planner tables, you will require a depth gauge, and a timing device for use underwater. Prior to the dive you will need to know the planned depths and times. The table will assist you in determining if the planned dive remains within recreational limits. If something was discovered during the planning phase such as the depth is too deep for a planned dive time or perhaps the time is too short to support a depth, you can make adjustments to the plan according to the tables.
After returning from the dive, should the dive have deviated from the plan, check the tables to assure you are still within safe recreational limits. Make changes to any upcoming dives that day. Make notes to carry on the next dive that allow you to reference your planned dive limits and any maximum and limits should the dive deviate from the plan.
Use the planner to quickly look up a depth and/or time. Combine the use of two or more tables to calculate a depth or a limit. When using the planner there are a number of rules to follow. Follow these rules when calculating depth and time.
When preparing for the first dive of the day, you will start from table 1. Table 1 informs you of a number of pieces of information. It will tell you the Maximum Bottom Time (No Decompression Limit, NDL) for the depth you plan to dive (See the red circled numbers and the black box circled in red) and the residual nitrogen (The Gold colored circles) the body has retained by the end of the dive..
Your next step is to determine the amount of time you would like to spend at 57 that will not exceed 55 minutes. You decide on 38 minutes. If this will be the only dive performed, there will be no need to continue with the planner. Go and enjoy your dive.
If your plan has you conducting multiple dives in a day, continue by scanning down the same column under 60 feet and locate your bottom time of 38 minutes. What you find are boxes with 37 minutes followed by 39 minutes. When searching for time where you do not find your exact time listed, round up to the next higher time. 39 minutes will be the time used in this case.
The Alpha designation represents a theoretical quantity of Nitrogen absorbed and stored in the body by the end of your dive. It represents the Residual Nitrogen that remains in the body. To simplify planning Residual Nitrogen is calculated as time.
Since 63 feet cannot be found at the top of the table, you move to the next deeper depth, 70 feet. Following the 70 foot column down you search for 32 minutes. The exact time was not found so you use the next highest time, 33 minutes. Scanning to the right, remaining on the horizontal line 33 minutes is found, you find the Pressure Group P
44 feet cannot be found at the top of the table, you move to the next deeper depth, 50 feet. Scanning down the 50 foot column you search for 54 minutes. The exact time was not found so you use the next highest time, 57 minutes. Scanning to the right, remaining on the horizontal line 57 minutes is found, you find the Pressure Group R
When performing multiple dives in a day, you will spend time on the surface between dives. The time spent on the surface allows excess nitrogen accumulated from previous dives to escape. Table 2 allows you to calculate the amount of residual nitrogen remaining in the body after a specified period of time on the surface.
Due to the excess nitrogen expelled during the surface interval you move from one pressure group to a lesser pressure group, affording you time or credit of time on your upcoming dive. Table 2 will inform you of this new pressure group.
To continue to table 2, you must start at the pressure group assigned from the end of your last dive. Let us continue from the last scenario where your planned dive to 44 feet for 54 minutes placed you in pressure group R at the end of the dive.
From the Pressure Group R continue on the horizontal line towards the right looking for a box containing a pair of numbers. The pair of numbers represent hours and minutes and denote time spent on the surface. After having spend 1 hour ans 10 minutes on the surface you find the pair of numbers where your 1:10 surface interval fall on or between the pair of numbers. You find the pair 1:08 and 1:15 which 1:10 falls between.
Scanning to the right of Pressure Group M, you look for the pair of times where your surface interval matches or is found between the two times. You find a pair with 0:56-1:04. Following the column down from this pair you come to the Pressure group designation D.
Table 3 informs you how much residual nitrogen remains in your body after spending a period of time out of the water in the form of minutes. This time is then added to the planned Actual Dive Time, ABT for the upcoming dive to determine your Pressure Group at the end of the dive. Table 3 also allows you to calculate your Adjusted No Decompression Limit, ANDL. Your Actual Bottom Time should not exceed the Adjusted No Decompression Limit.
Let us continue from Table 2 where your new Pressure Group after spending a period time out of the water is a C. Moving to table 3 you would locate Pressure Group C at the top of the table. You would then locate the depth for your next and upcoming dive on the left side. If you do not find your exact depth listed, round up to the next deepest depth.. For example, a dive to 75 feet would have you use the 80 foot depth on the left side of the card.
From the depth on the left, follow the row to towards the right until you are lined up with the column underneath the pressure group, C. Where the row and the column intersect will be a pair of numbers.
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