{"id":1731,"date":"2019-08-07T21:18:28","date_gmt":"2019-08-07T13:18:28","guid":{"rendered":"http:\/\/scubatechphilippines.com\/scuba_blog\/?p=1731"},"modified":"2023-04-13T20:58:39","modified_gmt":"2023-04-13T12:58:39","slug":"calculating-no-stop-time-scuba-diving","status":"publish","type":"post","link":"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/","title":{"rendered":"Calculating No Stop Time for Scuba Diving"},"content":{"rendered":"\n<h1 class=\"wp-block-heading has-text-align-center\">Calculating No Stop Time for Scuba Diving<\/h1>\n\n\n\n<p>Welcome to an informative article on &#8220;Calculating No Stop Time for Scuba Diving&#8221; written by Erik C. <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/confusion-deep-stops-erik-baker\/\">Baker<\/a>. This article is specifically designed for recreational divers who want to learn about the source theory and calculations involved in determining no stop times during their dives. <\/p>\n\n\n\n<p>By reproducing this article on our website, I aim to make this valuable source information easily accessible and available online for everyone. <\/p>\n\n\n\n<p>In this article, you will get to learn about the calculations and formulas developed from the basic Haldane equation. So, keep reading to gain a deeper understanding of the no-stop time calculation for scuba diving.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_80 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title ez-toc-toggle\" style=\"cursor:pointer\">Article Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#About-Erik-Baker\" >About Erik Baker<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#Calculating-%E2%80%98No-Stop-Time-by-Erik-C-Baker\" >Calculating &#8216;No Stop Time&#8217; by\u00a0Erik C. Baker<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#Re-arranging-the-Haldane-equiation\" >Re-arranging the Haldane equiation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#Substitute-the-surfacing-M-value\" >Substitute the surfacing M-value<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#An-example-dive\" >An example dive<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#Factoring-ambient-pressure-into-no-stop-time\" >Factoring ambient pressure into no stop time<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#Surfacing-M-values-vary-by-compartment\" >Surfacing M-values vary by compartment<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#You-cannot-apply-the-No-Stop-Time-under-this-condition\" >You cannot apply the No Stop Time under this condition<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#Surfacing-M-values-in-the-logarithm\" >Surfacing M-values in the logarithm<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#Scuba-Diving-No-Stop-Time-Summary\" >Scuba Diving No Stop Time Summary<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#No-stop-time-and-NDL\" >No stop time and NDL<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#Surface-interval-time\" >Surface interval time<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#NAUI-and-US-Navy-diving-tables\" >NAUI and US Navy diving tables<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#DAN-recommendations-on-flying-after-diving\" >DAN recommendations on flying after diving<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#About-The-Author\" >About The Author<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/calculating-no-stop-time-scuba-diving\/#Purchase-my-exclusive-diving-ebooks\" >Purchase my exclusive diving ebooks!<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"About-Erik-Baker\"><\/span>About Erik Baker<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Erik C. Baker is a well-known figure in the world of <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/what-is-technical-diving\/\">technical diving<\/a>, with a focus on decompression models and dive planning. He is an electrical engineer with a consulting engineering firm in Florida who has developed several computer <a href=\"https:\/\/www.shearwater.com\/wp-content\/uploads\/2012\/08\/Deep-Stops.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">programs to improve the safety of his cave and trimix diving<\/a>.<\/p>\n\n\n\n<p>Baker&#8217;s contributions to the diving community include articles on decompression models, such as his work on <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/understanding-m-values-eric-baker\/\">understanding M-values<\/a> and the <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/confusion-deep-stops-erik-baker\/\" target=\"_blank\" rel=\"noreferrer noopener\">use of deep stops<\/a>. He has also developed computer programs for dive planning, including those used to <a href=\"https:\/\/www.shearwater.com\/wp-content\/uploads\/2012\/08\/Oxygen_Toxicity_Calculations.pdf\">manage exposure to oxygen toxicity<\/a>. Additionally, he has written about calculating the &#8220;No-Stop Time&#8221; for divers <a href=\"https:\/\/www.shearwater.com\/wp-content\/uploads\/2012\/08\/No-Stop_Time.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">breathing only one inert gas, such as air or nitrox<\/a>.<\/p>\n\n\n\n<p>Calculating &#8216;No Stop Time&#8217; explains how to calculate the amount of time a diver can spend at a given depth without needing to make a decompression stop. <\/p>\n\n\n\n<p>This calculation is based on the Haldane equation, which describes <a href=\"https:\/\/www.shearwater.com\/wp-content\/uploads\/2012\/08\/No-Stop_Time.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">gas loading in tissues during a constant-depth dive<\/a>. Baker also wrote about the importance of proper decompression <a href=\"https:\/\/www.shearwater.com\/wp-content\/uploads\/2012\/08\/Deep-Stops.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">planning and avoiding decompression sickness in technical diving<\/a>.<\/p>\n\n\n\n<div class=\"scuba-b4-h2-2\" style=\"margin-top: 10px;margin-bottom: 10px;\" id=\"scuba-3432704251\"><div class=\"scuba-adlabel\">Sponsored Link<\/div><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-9354033900485448\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-9354033900485448\" \ndata-ad-slot=\"2393012471\" \ndata-ad-format=\"auto\" data-full-width-responsive=\"false\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div><h2 class=\"wp-block-heading has-text-align-left\"><span class=\"ez-toc-section\" id=\"Calculating-%E2%80%98No-Stop-Time-by-Erik-C-Baker\"><\/span>Calculating &#8216;No Stop Time&#8217; by\u00a0Erik C. Baker<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The following is an explanation about calculating the &#8220;No Stop Time&#8221;:<\/p>\n\n\n\n<p>Starting out with the basic Haldane equation (keep in mind that&nbsp;this equation is for a CONSTANT DEPTH profile, not for ascents&nbsp;or descents):<\/p>\n\n\n\n<p class=\"has-text-align-center\">P = Po + (Pi &#8211; Po)(1 &#8211; e^-kt)<\/p>\n\n\n\n<p>which states that P, the final <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/scuba-gas-laws-for-diving-physics\/\">partial pressure<\/a> in a given compartment\u00a0(as a function of time), will be the initial partial pressure, Po, plus\u00a0(or minus) the exponential gas loading that takes place. The exponential\u00a0gas loading is given by the second part of the equation, (Pi &#8211; Po)(1 &#8211; e^-kt).<\/p>\n\n\n\n<p>Note that Pi &#8211; Po is the pressure gradient between the inspired gas pressure\u00a0and the initial compartment pressure. This is the &#8220;driving force&#8221; for\u00a0on-gassing and off-gassing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Re-arranging-the-Haldane-equiation\"><\/span>Re-arranging the Haldane equiation<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>You can rearrange the Haldane equation to solve for time, t:<\/p>\n\n\n\n<p class=\"has-text-align-center\">(P &#8211; Po)\/(Pi &#8211; Po) = 1 &#8211; e^-kt<\/p>\n\n\n\n<p class=\"has-text-align-center\">e^-kt = 1 &#8211; (P &#8211; Po)\/(Pi &#8211; Po)<\/p>\n\n\n\n<p>Before you take the natural logarithm of both sides, you should simplify\u00a0the equation further (you did not do this in your post):<\/p>\n\n\n\n<p class=\"has-text-align-center\">e^-kt = (Pi &#8211; Po)\/(Pi &#8211; Po) &#8211; (P &#8211; Po)\/(Pi &#8211; Po)<\/p>\n\n\n\n<p class=\"has-text-align-center\">e^-kt = [(Pi &#8211; Po)-(P &#8211; Po)]\/(Pi &#8211; Po)<\/p>\n\n\n\n<p class=\"has-text-align-center\">e^-kt = (Pi &#8211; Po &#8211; P + Po)\/(Pi &#8211; Po)<\/p>\n\n\n\n<p class=\"has-text-align-center\">e^-kt = (Pi &#8211; P)\/(Pi &#8211; Po)<\/p>\n\n\n\n<p>Now take the natural logarithm of both sides:<\/p>\n\n\n\n<p class=\"has-text-align-center\">ln[e^-kt] = ln[(Pi &#8211; P)\/(Pi &#8211; Po)]<\/p>\n\n\n\n<p class=\"has-text-align-center\">-kt = ln[(Pi &#8211; P)\/(Pi &#8211; Po)]<\/p>\n\n\n\n<p class=\"has-text-align-center\">t = (-1\/k)*ln[(Pi &#8211; P)\/(Pi &#8211; Po)]<\/p>\n\n\n\n<p>This time, t, is the time that it will take for the compartment to load gas\u00a0(on-gas or off-gas) from the initial compartment pressure, Po, to the final\u00a0pressure, P.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Substitute-the-surfacing-M-value\"><\/span>Substitute the surfacing M-value<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>You can substitute the surfacing M-value, Mo, for the final pressure, P:<\/p>\n\n\n\n<p class=\"has-text-align-center\">t = (-1\/k)*ln[(Pi &#8211; Mo)\/(Pi &#8211; Po)]<\/p>\n\n\n\n<p>In this case, the time, t, is the &#8220;No Stop Time&#8221; or &#8220;No Decompression Limit&#8221; (NDL)&nbsp;based on the present gas loading, Po, and the inspired gas pressure, Pi.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"An-example-dive\"><\/span>An example dive<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A diver begins an air dive by descending to a depth of 30 meters of seawater (msw)&nbsp;very rapidly. Let&#8217;s assume that it was an &#8220;instantaneous&#8221; <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/best-technical-diving-computer\/\">descent<\/a>. Now he is on&nbsp;the bottom at 30 msw. What is the &#8220;No Stop Time&#8221; or &#8220;No &nbsp;Decompression Limit&#8221; for&nbsp;this depth?<\/p>\n\n\n\n<p>Note: Remember all pressures are ABSOLUTE!<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Factoring-ambient-pressure-into-no-stop-time\"><\/span>Factoring ambient pressure into no stop time<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Assuming the dive is from sea level, the <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/understanding-m-values-eric-baker\/\">ambient pressure<\/a> is the depth pressure of&nbsp;30 msw plus the surface barometric pressure of 10 msw:<\/p>\n\n\n\n<p class=\"has-text-align-center\">Pamb = 30 msw + 10 msw = 40 msw<\/p>\n\n\n\n<p>The inspired pressure is the ambient pressure minus the water vapor pressure&nbsp;(<a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gradient-factors-dummies\/\">Buhlmann<\/a> value) times the fraction of inert gas:<\/p>\n\n\n\n<p class=\"has-text-align-center\">Pi = (Pamb &#8211; PH2O)<em>FN2 = (40 msw &#8211; 0.627 msw)<\/em>0.79 = 31.1 msw<\/p>\n\n\n\n<p>The initial compartment pressure will be due to breathing atmospheric air at the&nbsp;surface for a long time (first dive of the day):<\/p>\n\n\n\n<p class=\"has-text-align-center\">Po = (Pamb &#8211; PH20)<em>FN2 = (10 msw &#8211; 0.627 msw)<\/em>0.79 = 7.4 msw<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Surfacing-M-values-vary-by-compartment\"><\/span>Surfacing M-values vary by compartment<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>The surfacing M-values will vary by compartment. Example: for Compartment No. 2 using the\u00a0Buhlmann ZH-L16B M-values, Mo = 25.4 msw.<\/p>\n\n\n\n<p>The time constant, k, for Compartment No. 2 is the natural logarithm of 2 divided&nbsp;by the half-time:<\/p>\n\n\n\n<p class=\"has-text-align-center\">k (Cpt 2) = ln2\/half-time = 0.693\/8 min = 0.086625<\/p>\n\n\n\n<p>Now we can compute the &#8220;No Stop Time&#8221; or NDL for this compartment:<\/p>\n\n\n\n<p class=\"has-text-align-center\">t = (-1\/k)*ln[(Pi &#8211; Mo)\/(Pi &#8211; Po)]<\/p>\n\n\n\n<p class=\"has-text-align-center\">t (Cpt 2) = (-1.0\/0.086625)*ln[(31.1 &#8211; 25.4)\/(31.1 &#8211; 7.4)]<\/p>\n\n\n\n<p class=\"has-text-align-center\">t (Cpt 2) = 16.45 minutes<\/p>\n\n\n\n<p>This process is repeated for each compartment and the shortest time computed&nbsp;across all compartments is the NDL for the profile.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"You-cannot-apply-the-No-Stop-Time-under-this-condition\"><\/span>You cannot apply the No Stop Time under this condition<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>VERY IMPORTANT NOTE: You cannot apply the &#8220;No Stop Time&#8221; equation: t = (-1\/k)*ln[(Pi &#8211; Mo)\/(Pi &#8211; Po)], under the following conditions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If the quantity within the logarithm bracket is a negative number.\u00a0This is because the logarithm of a negative number is a complex number\u00a0(i.e. a + ib) which is NOT A REAL situation for diving!<\/li>\n<\/ul>\n\n\n\n<p>The quantity within the logarithm bracket will be negative if:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Mo &gt; Pi &gt; Po<\/li>\n\n\n\n<li>Mo &lt; Pi &lt; Po<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If Pi = Po then there will be division by zero which cannot be accomplished.<\/li>\n\n\n\n<li>If the quantity within the logarithm bracket is a positive number greater than&nbsp;one (1), then the time computed in the overall equation will be negative, which&nbsp;is NOT A REAL situation for diving!<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Surfacing-M-values-in-the-logarithm\"><\/span>Surfacing M-values in the logarithm<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>The quantity within the logarithm bracket will be positive and greater than&nbsp;one (1) if:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Mo &lt; Pi > Po<\/li>\n\n\n\n<li>Mo > Pi &lt; Po<\/li>\n<\/ol>\n\n\n\n<p>THEREFORE, the &#8220;No Stop Time&#8221; equation, t = (-1\/k)*ln[(Pi &#8211; Mo)\/(Pi &#8211; Po)], can only be applied when:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Pi > Mo > Po (on-gassing), or<\/li>\n\n\n\n<li>Pi &lt; Mo &lt; Po (off-gassing)<\/li>\n<\/ol>\n\n\n\n<p>In other words, Mo, has to be a value between the present value of Pi and Po.<\/p>\n\n\n\n<p>For the typical sport diving application, the &#8220;No Stop Time&#8221; equation will be&nbsp;applied only for condition A above, that is when,<\/p>\n\n\n\n<p class=\"has-text-align-center\">Pi > Mo > Po (on-gassing)<\/p>\n\n\n\n<p>The program must include the logic to account for this requirement. An example<br \/>of this is as follows:<\/p>\n\n\n\n<p>NOSTOP = 0.0<br \/>DO 100 I = 1,16<br \/>IF ((PIN2 .GE. MVALUE(I)) .AND. (MVALUE(I) .GT. PN2O(I)) THEN&nbsp;TIME(I) = -1.0\/KN2(I)*ALOG((PIN2 &#8211; MVALUE(I))\/(PIN2 &#8211; PN2O(I)))<br \/>NOSTOP = MIN(NOSTOP, TIME(I))<br \/>END IF<br \/>100 CONTINUE<\/p>\n\n\n\n<p>The &#8220;No Stop Time&#8221; calculation will be applied after each change in depth during the\u00a0dive (if it is being calculated in real-time). Of course, the dive computer will still\u00a0need to keep track of the gas loadings separately during the dive as well.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Scuba-Diving-No-Stop-Time-Summary\"><\/span>Scuba Diving No Stop Time Summary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Calculating No Stop Time for Scuba Diving refers to the maximum amount of time that a scuba diver can safely spend underwater at a certain depth without requiring a decompression stop. Several factors determine No Stop Time, including the dive&#8217;s depth, duration, and breathing gas mixture.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"No-stop-time-and-NDL\"><\/span>No stop time and NDL<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>It&#8217;s important to note that most recreational dives have a No Decompression Limit (NDL), which is the maximum time a diver can spend at a particular depth without requiring a decompression stop. For instance, the NDL at 60 feet is 55 minutes. If a diver exceeds the NDL, they must <a href=\"https:\/\/joescuba.com\/2014\/02\/no-stop-vs-no-decompression-which-is-correct\/\" target=\"_blank\" rel=\"noreferrer noopener\">make decompression stops to prevent decompression sickness<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Surface-interval-time\"><\/span>Surface interval time<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Moreover, scuba divers must also factor in the surface interval time (SIT) between dives, which determines the repetitive dive timetable. A repetitive dive timetable allows divers to make successive dives while avoiding <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/types-decompression-sickness-dcs\/\">decompression sickness<\/a>. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"NAUI-and-US-Navy-diving-tables\"><\/span>NAUI and US Navy diving tables<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>NAUI Dive Tables are a set of <a href=\"https:\/\/www.naui.org\/resources\/dive-tables-review\/\" target=\"_blank\" rel=\"noreferrer noopener\">tables based on the US Navy Decompression Tables<\/a> and are designed explicitly for recreational diving. They consist of three factors:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>End-Of-Dive Letter Group<\/li>\n\n\n\n<li>Surface Interval Time (SIT) Table<\/li>\n\n\n\n<li>Repetitive Dive Timetable<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"DAN-recommendations-on-flying-after-diving\"><\/span>DAN recommendations on flying after diving<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Finally, DAN recommends allowing a minimum of:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>24 hours before flying after any dive to account for variables such as fatigue and dehydration <\/li>\n\n\n\n<li>Single dives within the No Decompression Limits require a minimum of 12 hours before flying<\/li>\n\n\n\n<li>Repetitive dives of multiple days require at least 18 hours. <\/li>\n\n\n\n<li><a href=\"https:\/\/www.tdisdi.com\/sdi-diver-news\/dive-computer-no-fly-time\/\" target=\"_blank\" rel=\"noreferrer noopener\">Decompression dives (planned or unplanned) require substantially more time<\/a><\/li>\n<\/ul>\n\n\n\n<p>In summary, calculating No Stop Time for Scuba Diving is critical to ensure divers don&#8217;t exceed the No Decompression Limit and make decompression stops. Divers must also consider other factors such as the repetitive dive timetable, surface interval time, and DAN&#8217;s recommendations before flying.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n\n\n\n<div class=\"wp-block-columns alignwide is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-content-justification-center is-layout-constrained wp-block-column-is-layout-constrained\" style=\"flex-basis:25%\">\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-medium is-resized is-style-default\"><a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/andy-davis-technical-diving\/\"><img decoding=\"async\" width=\"300\" height=\"296\" src=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2018\/03\/Cartoon-Andy-900x900-1-300x296.png\" alt=\"Andy Davis Technical Sidemount Wreck Diving Subic Bay Philippines RAID Courses Training\" class=\"wp-image-6812\" style=\"width:225px;height:222px\" srcset=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2018\/03\/Cartoon-Andy-900x900-1-300x296.png 300w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2018\/03\/Cartoon-Andy-900x900-1-1024x1009.png 1024w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2018\/03\/Cartoon-Andy-900x900-1-768x757.png 768w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2018\/03\/Cartoon-Andy-900x900-1.png 1280w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-constrained wp-block-column-is-layout-constrained\" style=\"flex-basis:75%\">\n<h2 class=\"wp-block-heading has-text-align-center\"><span class=\"ez-toc-section\" id=\"About-The-Author\"><\/span>About The Author<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><a href=\"https:\/\/buymeacoffee.com\/andydavistech\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" width=\"274\" height=\"77\" src=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2022\/12\/bmc-button-1-1.png\" alt=\"\" class=\"wp-image-27046\" srcset=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2022\/12\/bmc-button-1-1.png 274w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2022\/12\/bmc-button-1-1-250x70.png 250w\" sizes=\"(max-width: 274px) 100vw, 274px\" \/><\/a><\/figure>\n\n\n\n<p><a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/andy-davis-technical-diving\/\">Andy Davis<\/a> is a <a href=\"https:\/\/scubatechphilippines.com\/raid-diving-courses-philippines\/raid\/\">RAID<\/a>, PADI TecRec, ANDI, BSAC, and SSI-qualified independent technical diving instructor who specializes in teaching <a href=\"https:\/\/scubatechphilippines.com\/sidemount-courses\/\">sidemount<\/a>, <a href=\"https:\/\/scubatechphilippines.com\/technical-diving-courses\/\">trimix<\/a>, and <a href=\"https:\/\/scubatechphilippines.com\/technical-diving-courses\/\">advanced wreck<\/a> diving courses.<\/p>\n<\/div>\n<\/div>\n\n\n\n<p>Currently residing in <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/subic-bay-wreck-diving-sites\/\">Subic Bay, Philippines<\/a>; he has amassed more than 10,000 open-circuit and CCR dives over three decades of challenging diving across the globe.<\/p>\n\n\n\n<p><a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/andy-davis-technical-diving\/\">Andy<\/a> has published numerous diving magazine articles and designed advanced certification courses for several dive training agencies, He regularly tests and reviews new dive gear for scuba equipment manufacturers. Andy is currently writing a series of <a href=\"https:\/\/www.buymeacoffee.com\/andydavistech\/extras\">advanced diving books <\/a>and creating a range of <a href=\"https:\/\/www.redbubble.com\/people\/andydavistech\/shop\">tech diving clothing and accessories<\/a>.<\/p>\n\n\n\n<p>Prior to becoming a professional technical diving educator in 2006, Andy was a commissioned officer in the Royal Air Force and has served in Iraq, Afghanistan, Belize, and Cyprus.<\/p>\n\n\n\n<p>In 2023, Andy was named in the &#8220;<a rel=\"noreferrer noopener\" href=\"https:\/\/gue.com\/blog\/sidemount-andy-davies\/\" target=\"_blank\">Who&#8217;s Who of Sidemount<\/a>&#8221; list by GUE InDepth Magazine.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-palette-color-7-color has-vivid-red-background-color has-text-color has-background has-link-color wp-elements-dd81a6de961563c5bf17302e4376cbd2\"><span class=\"ez-toc-section\" id=\"Purchase-my-exclusive-diving-ebooks\"><\/span>Purchase my exclusive diving ebooks!<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<div class=\"wp-block-columns is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/buymeacoffee.com\/andydavistech\/e\/233191\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" width=\"652\" height=\"1024\" src=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/03\/Gas-Management-Book-Cover-Image-652x1024.jpg\" alt=\"Gas Management For Scuba Divers Book\" class=\"wp-image-26264\" srcset=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/03\/Gas-Management-Book-Cover-Image-652x1024.jpg 652w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/03\/Gas-Management-Book-Cover-Image-191x300.jpg 191w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/03\/Gas-Management-Book-Cover-Image-768x1206.jpg 768w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/03\/Gas-Management-Book-Cover-Image-96x150.jpg 96w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/03\/Gas-Management-Book-Cover-Image.jpg 794w\" sizes=\"(max-width: 652px) 100vw, 652px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/buymeacoffee.com\/andydavistech\/e\/233171\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" width=\"652\" height=\"1024\" src=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/Shearwater-Gradient-Factors-ebook-652x1024.jpg\" alt=\"Become A Shearwater Power User Book\" class=\"wp-image-26382\" srcset=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/Shearwater-Gradient-Factors-ebook-652x1024.jpg 652w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/Shearwater-Gradient-Factors-ebook-191x300.jpg 191w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/Shearwater-Gradient-Factors-ebook-768x1206.jpg 768w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/Shearwater-Gradient-Factors-ebook-978x1536.jpg 978w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/Shearwater-Gradient-Factors-ebook-95x150.jpg 95w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/Shearwater-Gradient-Factors-ebook.jpg 1200w\" sizes=\"(max-width: 652px) 100vw, 652px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/buymeacoffee.com\/andydavistech\/e\/111242\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" width=\"652\" height=\"1024\" src=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/COVER-IMAGE-652x1024.jpg\" alt=\"\" class=\"wp-image-26656\" srcset=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/COVER-IMAGE-652x1024.jpg 652w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/COVER-IMAGE-191x300.jpg 191w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/COVER-IMAGE-768x1206.jpg 768w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/COVER-IMAGE-96x150.jpg 96w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/COVER-IMAGE.jpg 794w\" sizes=\"(max-width: 652px) 100vw, 652px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/buymeacoffee.com\/andydavistech\/e\/262907\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" width=\"652\" height=\"1024\" src=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/07\/BPW-Book-Cover-Image-652x1024.jpg\" alt=\"A Comprehensive Guide to Backplate &amp; Wing BCDs\" class=\"wp-image-26808\" srcset=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/07\/BPW-Book-Cover-Image-652x1024.jpg 652w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/07\/BPW-Book-Cover-Image-191x300.jpg 191w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/07\/BPW-Book-Cover-Image-768x1206.jpg 768w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/07\/BPW-Book-Cover-Image-96x150.jpg 96w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/07\/BPW-Book-Cover-Image.jpg 794w\" sizes=\"(max-width: 652px) 100vw, 652px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/buymeacoffee.com\/andydavistech\/e\/260377\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" width=\"652\" height=\"1024\" src=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/The-Path-To-Proficiency-Book-Cover-Image-652x1024.jpg\" alt=\"Diving Psychology The Path to Proficiency: Mental Strategies for Scuba Divers (eBook)\" class=\"wp-image-26633\" srcset=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/The-Path-To-Proficiency-Book-Cover-Image-652x1024.jpg 652w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/The-Path-To-Proficiency-Book-Cover-Image-191x300.jpg 191w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/The-Path-To-Proficiency-Book-Cover-Image-768x1206.jpg 768w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/The-Path-To-Proficiency-Book-Cover-Image-96x150.jpg 96w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/The-Path-To-Proficiency-Book-Cover-Image.jpg 794w\" sizes=\"(max-width: 652px) 100vw, 652px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n<p id=\"rop\"><small>Originally posted 2018-03-07 23:54:23. <\/small><\/p>","protected":false},"excerpt":{"rendered":"<p>Calculating No Stop Time for Scuba Diving Welcome to an informative article on &#8220;Calculating No Stop Time for Scuba Diving&#8221; written by Erik C. Baker. This article is specifically designed for recreational divers who want to learn about the source theory and calculations involved in determining no stop times during their dives. By reproducing this [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2224,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[288],"tags":[397,394,387,395,396,343,204],"class_list":["post-1731","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-diving-theory","tag-erik-baker-decompression-theory-scientist","tag-haldane-in-scuba-diving-theory-decompression","tag-scuba-diving-advice","tag-scuba-diving-formula","tag-scuba-diving-no-stop-time","tag-scuba-diving-physics-theory","tag-scuba-diving-theory"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":6}},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Calculating No Stop Time for Scuba Diving<\/title>\n<meta name=\"description\" content=\"Calculating No Stop Time for Scuba Diving: an article by Erik C. 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