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69 Cards in this Set
- Front
- Back
The individual credited with developing the basic decompression model used in most dive table and computers today is:
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John Scott Haldane
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The Haldanean model consists of several ______, each with a _____ in minutes that represent how fast it absorbs and releases nitrogen, and a(n) _____ that sets the maximum nitrogen pressure it can have when a diver surfaces.
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Compartments, halftimes, M-value
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A 60-minute tissue compartment requires ______ to fill or empty completely, while a 120-minute compartment requires _____.
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6 hours, 12 hours
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There is _____ relationship between the Haldanean model and the human body; you can rely it only as far as it is supported by ____.
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No direct, test and field data
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What is Actual bottom time?
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Used in repetitive diving and added to Residual Nitrogen Time equal to Total Bottom Time
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What is Adjusted no decompression limit?
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The time limit for a repetitive dive that accounts for residual nitrogen remaining in your body form a previous dive
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What is Bottom time?
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The time from the beginning of descent until the beginning a direct continuous ascent to the surface or safety stop
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What is Total Bottom time?
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The sum of Residual Nitrogen time and Actual Bottom Time of a repetitive dive used on Table 1 of the RDP Table to determine the pressure group following the repetitive dive
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What is Surface Interval?
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The time spent on the surface between two dives – usually recorded in hours: minutes
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What is Residual Nitrogen time?
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An amount of nitrogen, expressed in minutes, for a specific depth added to the actual bottom time of a dive to account for residual nitrogen from a previous dive
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What is Safety Stop?
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A stop usually at 5meters/15 feet for three or more minutes at the end of a dive for additional safety
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What is Residual Nitrogen?
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The higher than normal amount of nitrogen remaining in your body after a dive
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What is Pressure Group?
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A letter used on the Recreational Dive Planner to designate the amount of theoretical residual nitrogen in your body
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What is Repetitive dive?
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A dive that follows another while there is still residual nitrogen in your body
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What is No Stop Dive?
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A dive made within no decompression limits because you don’t have any required emergency stops
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What is Ascent Rate?
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The proper speed for ascending, which is not faster than 18meters/60 feet per minute
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What is No Decompression Limit?
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The maximum time that can be spent at a depth before decompression stops are required
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The early versions of the US Navy tables were the standard for recreational diving because:
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they were widely available, many early divers were former military divers who used them already, and before the rise of computers, it was beyond the piratical abilities of most people to develop a table
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The basis of surface interval credit with the 1950’s version of the US Navy table is the _____ minute compartment.
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120
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The US Navy selected the 120-minute tissue compartment to control their “Surface Interval Credit Table” because:
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they were designing table that enabled decompression diving
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The RDP uses a different basis for repetitive diving from that used by the 1950s US Navy table because:
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surface interval credit can be less restrictive when limited to no decompression diving
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The 60 minute halftime surface interval credit of the RDP gives approximately ________ the surface interval credit of the 1950s version of the US Navy tables.
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Double
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Why were the WX and YZ rules created for RDP?
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Analysis found that a compartment slower than 60 minutes could control a repetitive dive for a small portion of no stop dives involving long shallow multiple dive profiles
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The RDP was developed for ____ divers. Its test included ____ divers, a wider range of _____ and _____type.
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Recreational, female, age, physical
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Why can’t pressure groups from the RDP be used on the US Navy table or any other tables?
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The tables are based on different decompression models
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Match the version of the RDP with its name:
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Traditional RDP, Enriched Air RDP and eRDPML
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A dive computer provides more no decompression time than a table because:
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it eliminates unnecessary rounding by calculating the dive exactly
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A dive computer:
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follows the same theoretical basis as dive tables, calls for following the same general recommendations as when diving with tables and should not be shared by 2 or more divers on a dive
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Which decompression models are commonly used in dive computer?
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Buhlmann limits –EE washout & Spencer Limits – 60 minute washout
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Some dive computers have added adjustments that reduce dive time or mandate safety/decompression stops:
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if you exceed a safe ascent rate, if the water is cold or if you make short surface intervals
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Most RDP special rules, recommendations and considerations come entirely from ________.
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What diving found to work, whether they have any basis in a decompression model or not
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An in-depth understanding of all the special rules, recommendations, and considerations can help you _____.
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Avoid decompression sickness
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Which of the following are recommendations or rules for RDP use?
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Make deeper dives before shallower dives, make safety stops at the end of all dives, plan cold/strenuous dives as if they are 4 meters/10 feet deeper than actual, and allow at least 12 hours after diving before flying
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When diving with a computer:
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follow the recommendations that apply to dive table, don’t share it with a buddy, and follow manufacturer recommendations
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With the RDP, if you are planning 3 or more dives in a day, beginning with the first dive, if you ending pressure group after any dive is W or X, the minimum surface interval between all subsequent dives is _______.
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1 hour
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When using the RDP, limit repetitive dives to:
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30 meters/100 feet or shallower
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The 42meters/140 foot designation on the Recreational Dive Planner is for ______.
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Emergency purposes only; do not dive deeper than 40 meters/130 feet
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RDP procedures REAUIRE a safety stop:
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On any dive to 30metes/100feet or deeper, on any dive that comes within three Pressure Groups of a no decompression limit, and on any dive that reaches RDP limit
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If you discover you have accidentally descended below 40 meters/130 feet, immediately _________.
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Ascend to 5meter/15 feet, make an emergency decompression stop for 8 minutes and do not dive again for 6 hours
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If while at depth, you discover that you have exceeded a not decompression limit on the RDP by 5 minutes or less you should _________.
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Make an emergency decompression stop for 8 minutes at 5meter/15 feet prior to surfacing, then remain out of the water at least 6 hours prior to making another dive
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You need to follow special dive table and computer procedures at altitude (where there is _____ atmospheric pressure) because decompression model were developed for ______.
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Less/sea level
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Using the RDP above ______ requires the use of special procedures including the conversion of actual depth to theoretical depth. To use theoretical depth tables you must know the _______.
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1000 feet/ altitude of the dive
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At about ____ above sea level, atmospheric pressure drops enough to question the accuracy of calculations intended for sea level. Diving ______ this altitude without following proper altitude procedures increases the risk of decompression sickness.
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300 meters/100 feet & above
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You may use the RDP to plan dives to a maximum altitude of _______.
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3,000meters/10,000feet
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When making an altitude dive, the ascent rate is ______ per minute or slower.
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9 meters/30 feet
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Make no more than __ dives per day while altitude diving, and don’t mix altitudes by making the repetitive dive at a ____ altitude than the first dive.
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Two/higher
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A diver plans an altitude dive at 2286meters/7500feet. What is the divers’ pressure group upon arrival at the dive site altitude?
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P
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A diver plans to dive at an altitude of 2150meters/7053 feet to an actual depth of 25 meters/65 feet. What is the depth used on the RDP for planning this dive?
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35 meters/94 feet
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IF you make a single no decompression dive at sea level, it is suggested that you minimum preflight surface interval be:
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12 hours
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Using the RDP above ______ requires the use of special procedures including the conversion of actual depth to theoretical depth. TO use theoretical depth tables, you must know ____.
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300meters/1000feet & altitude of the dive
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Flying after diving recommendations suggest that divers wait __ hours after completing a single dive and __ hours after completing multiple dives for several days before flying in a commercial jet airliner.
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12/18
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In a decompression model, the rate at which a theoretical tissue absorbs and releases nitrogen is called its:
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halftime
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You can rely on Haldanean decompression model:
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only as far as it has been shown to work in tests and by field experience
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The US Navy tables were the standard for recreational diving at one time because:
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many years ago, recreational divers and instructors came from military and merely adopted them for use
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If a diver exceeded the no decompression limit for a dive by 5 minutes, but didn’t realize it until after surfacing and boarding the dive boat, what procedures would the diver follow?
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Remain on the surface, rest and be monitored for signs/symptoms of decompression sickness; wait at least 24 hours before diving again
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The US Navy table repetitive dive credit is based on a ____, and the RDP’s repetitive dive credit is based on a _____.
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120 minute half time/60 minute halftime
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The effect of RDP’s repetitive control compared to the US Navy table’s is that the RDP:
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gives approximately twice the credit for a given surface interval
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A dive computer provides more no-decompression time than a table because:
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it eliminates unnecessary rounding by calculating the dive exactly
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A dive computer:
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follows the same theoretical basis as dive table, calls for following the same general recommendations as when diving with tables, and should not be shared by two or more divers on a dive
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You cannot interchange Pressure Groups from the RDP with those of the US Navy table or other tables, or vice versa, because:
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the tables are based on different models and the letter designations represent different theoretical nitrogen levels
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The RDP model is characterized by:
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14 compartments and a 60 minute surface interval washout
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Using the RDP table, you plan to make two dives, the first to 40m/130ft and the second to 12m/40ft. What is the no decompression limit for the first dive? Assuming your first dive is for 9 minutes and you have a one hour, 30 minute surface interval, what is the no decompression limit for the second dive?
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10 minutes/124 minutes
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Using the RDP table, you plan to make three dives. The first will be to 29meters/95 feet for 15 minutes, followed by a one hour, 45 minute surface interval. The second will be to 21m/67ft for 20 minutes. If this is followed by a 52 minute surface interval, what is the no decompression limit for a repetitive dive to 21m/67 ft.?
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25 minutes
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Using the RDP table, what is the minimum surface interval required between a dive to 16m/50ft for 60 minutes, followed by a second dive to 14m/40ft for 70 minutes?
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11 minutes
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Using the eRDPML, what is the no decompression limit for a dive28m/95ft?
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22 minutes (planning mode)
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Using the eRDPML, you plan to make two dives. The first dive will be to 28m/95 ft for 14 minutes, followed by a one hour, 30 minute surface interval. The second dive will be to 12m/40ft. What is the no decompression limit for the second dive?
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124 minutes (planning mode)
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Using the eRDPML, you’re planning a two-level multilevel dive. You plan to spend 18 minutes at your first level of 29m/92ft and then ascend to 20m/65ft for the remainder of the dive. What is the maximum time you can spend at you second depth level?
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11 minutes (planning mode w/multilevel dive)
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Using the eRDPML, you plan to make three dives. The first will be to 19m/63 ft for 30 minutes, followed by a 30 minute surface interval. The second will be to 15m/54ft for 27 minutes. If this is followed by a one hour, 40 minute surface interval, what is the on decompression limit for a repetitive dive to 14m/48 ft?
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63 minutes (planning mode)
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Using the eRDPML, you have just made two dives, the first to 29m/98ft for 12 minutes, and the second to 23m/59ft for 20 minutes, with a 42 minute surface interval between them. What is the minimum required surface interval for a third dive to 15m/54 ft for 40 minutes?
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31 minutes (dive planning & surface interval)
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