{"id":11095,"date":"2025-08-29T03:20:43","date_gmt":"2025-08-29T03:20:43","guid":{"rendered":"https:\/\/daivings.lv\/?p=11095"},"modified":"2025-09-22T09:02:21","modified_gmt":"2025-09-22T09:02:21","slug":"nirsana-ar-rebrideru-slegta-cikla-rebrizers-ccr-un-nireju-izpratne-par-skabekla-spiedienu","status":"publish","type":"post","link":"https:\/\/daivings.lv\/en\/diving-with-a-rebreather-closed-cycle-rebreather-ccr-and-divers-understanding-of-oxygen-pressure\/","title":{"rendered":"Diving with a rebreather (closed-cycle rebreather (CCR)) and divers&#039; understanding of oxygen pressure"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of 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 Contents\"><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' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/daivings.lv\/en\/diving-with-a-rebreather-closed-cycle-rebreather-ccr-and-divers-understanding-of-oxygen-pressure\/#Raksts_tapis_kopa_ar_Valteru_Preimani_MSDT_Master_Scuba_Diver_Trainer\" >The article was written together with Valters Preimani, MSDT (Master Scuba Diver Trainer).<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/daivings.lv\/en\/diving-with-a-rebreather-closed-cycle-rebreather-ccr-and-divers-understanding-of-oxygen-pressure\/#PO2_09_Decompression_Setpoint\" >PO2 = 0.9 (Decompression Setpoint)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/daivings.lv\/en\/diving-with-a-rebreather-closed-cycle-rebreather-ccr-and-divers-understanding-of-oxygen-pressure\/#PO2_14_Bottom_Setpoint\" >PO2 = 1.4 (Bottom Setpoint)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/daivings.lv\/en\/diving-with-a-rebreather-closed-cycle-rebreather-ccr-and-divers-understanding-of-oxygen-pressure\/#Slapekla_izvadisana\" >Nitrogen removal<\/a><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading has-medium-font-size\"><span class=\"ez-toc-section\" id=\"Raksts_tapis_kopa_ar_Valteru_Preimani_MSDT_Master_Scuba_Diver_Trainer\"><\/span>The article was written together with Valters Preimani, MSDT (Master Scuba Diver Trainer).<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Today I want to address a topic that often raises questions for both my students and experienced divers: nitrox in a rebreather\/ <em>closed-loop rebreather<\/em>\u00a0(CCR) \u2013 what it looks like versus open-cycle scuba. It is a crucial step in understanding how we can dive deeper and longer using modern technology.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The biggest difference is how the rebreeder is managed. <strong>partial pressure of oxygen (PO2)<\/strong>Open-cycle diving (<strong><a href=\"https:\/\/daivings.lv\/padi-owd-apmaciba-latvija\/\">Paddy in the OWD course<\/a><\/strong>) with nitrox means you are breathing a gas with a fixed percentage of oxygen (e.g. 32%). Your PO2 increases as you go deeper. For example, with 32% nitrox at a depth of 20 meters your PO2 is 0.96 ATA.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><img decoding=\"async\" src=\"https:\/\/daivings.lv\/wp-content\/uploads\/2025\/08\/JJ-SLOKA-QUARRY-1024x678.jpg?v=1758531487\" alt=\"\"><\/td><td><img decoding=\"async\" src=\"https:\/\/daivings.lv\/wp-content\/uploads\/2025\/08\/JJ-CCR-1024x576.jpg\" alt=\"\"><\/td><\/tr><tr><td>JJ CCR rebreather training at Sloka quarry<\/td><td>JJ CCR rebreather training with BA cylinder<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">But a rebreather works differently. It&#039;s like your own personal gas blender underwater. You set your desired PO2 (e.g. 1.4 ATA), and the rebreather&#039;s computer automatically adjusts the percentage of oxygen to keep that value constant regardless of depth. It&#039;s <strong>constant PO2 diving<\/strong>.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>What percentage of nitrox is breathed at various depths if PO2 is kept constant? <\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Let&#039;s look at some examples using our formulas:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FO2\u200b=P amb \u200bPO2\u200b\u200b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Where P amb\u200b (absolute pressure) is 1+10 depth\u200b<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PO2_09_Decompression_Setpoint\"><\/span>PO2 = 0.9 (Decompression Setpoint)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">This setting is commonly used during decompression stops to effectively get rid of nitrogen.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>4 meters (1.4 ATA):<\/strong> The rebreather adds oxygen to the mixture to make it <strong>64.3% nitrox<\/strong>.<\/li>\n\n\n\n<li><strong>6 meters (1.6 ATA):<\/strong> The amount of oxygen is reduced to <strong>56.3% nitrox<\/strong>.<\/li>\n\n\n\n<li><strong>20 meters (3.0 ATA):<\/strong> Now you are breathing. <strong>30% nitrox<\/strong>.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PO2_14_Bottom_Setpoint\"><\/span>PO2 = 1.4 (Bottom Setpoint)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">This is the maximum allowable PO2 at depth, ensuring maximum efficiency without risk.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>4 meters (1.4 ATA):<\/strong> You are breathing. <strong>100% oxygen<\/strong>.<\/li>\n\n\n\n<li><strong>6 meters (1.6 ATA):<\/strong> The rebreather reduces the amount of oxygen to <strong>87.5% nitrox<\/strong>.<\/li>\n\n\n\n<li><strong>20 meters (3.0 ATA):<\/strong> You are breathing. <strong>46.7% nitrox<\/strong>.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">As you can see, the percentage of gas in a rebreather dive is not fixed. It changes to maintain your set PO2. This is the biggest advantage and difference. While an open circuit diver is forced to dive with a specific mix, a rebreather diver is always breathing the most optimal gas, which maximizes time underwater and minimizes decompression obligations.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>What effect does 50% nitrox have on a person at a depth of 6 meters, how does it affect physiologically?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Diving to a depth of 6 meters with 50% nitrox (EAN50)<\/strong> is very safe, but it is basically used <strong>decompression stops<\/strong>Physiologically, the main effect is <strong>partial pressure of oxygen (PO2)<\/strong> impact and significantly reduced <strong>nitrogen (N2)<\/strong> quantity.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"994\" height=\"193\" src=\"https:\/\/daivings.lv\/wp-content\/uploads\/2025\/08\/Screenshot-2025-08-29-061219.png?v=1756437223\" alt=\"\" class=\"wp-image-11096\" srcset=\"https:\/\/daivings.lv\/wp-content\/uploads\/2025\/08\/Screenshot-2025-08-29-061219.png?v=1756437223 994w, https:\/\/daivings.lv\/wp-content\/uploads\/2025\/08\/Screenshot-2025-08-29-061219-300x58.png?v=1756437223 300w, https:\/\/daivings.lv\/wp-content\/uploads\/2025\/08\/Screenshot-2025-08-29-061219-768x149.png?v=1756437223 768w, https:\/\/daivings.lv\/wp-content\/uploads\/2025\/08\/Screenshot-2025-08-29-061219-18x3.png?v=1756437223 18w, https:\/\/daivings.lv\/wp-content\/uploads\/2025\/08\/Screenshot-2025-08-29-061219-230x45.png?v=1756437223 230w, https:\/\/daivings.lv\/wp-content\/uploads\/2025\/08\/Screenshot-2025-08-29-061219-350x68.png?v=1756437223 350w, https:\/\/daivings.lv\/wp-content\/uploads\/2025\/08\/Screenshot-2025-08-29-061219-480x93.png?v=1756437223 480w\" sizes=\"auto, (max-width: 994px) 100vw, 994px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">This PO2 level (0.8 ATA) is perfectly safe and even lower than the maximum allowable for recreational diving (1.4 ATA). It does not cause oxygen toxicity. Therefore, 50% nitrox mix is often used as a decompression gas, as it accelerates the elimination of nitrogen from the body while maintaining PO2 levels within safe limits.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Slapekla_izvadisana\"><\/span>Nitrogen removal<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The main physiological benefit is a significantly reduced nitrogen absorption. Air contains 79% nitrogen, while a 50% nitrox mix contains only 50% nitrogen. As a result:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Reduced nitrogen stress:<\/strong> The body absorbs much less nitrogen, which significantly reduces the risk of decompression sickness.<\/li>\n\n\n\n<li><strong>Faster nitrogen removal:<\/strong> When this mixture is used for a decompression stop, the high oxygen content promotes the release of nitrogen from the tissues, which allows for a shorter decompression time.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In practice, at a depth of 6 meters with 50% nitrox there is very minimal nitrogen uptake during descent, but when used as a decompression gas after a deeper dive, it works very effectively to remove accumulated nitrogen.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">We invite you to learn rebreather diving to discover these benefits and take your diving skills to a new level. Safe diving!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Valters Preimanis<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PADI MSDT Trainer Daivings.lv<\/p>","protected":false},"excerpt":{"rendered":"<p>This article was written with Valters Preimani, MSDT (Master Scuba Diver Trainer). Today I want to address a topic that often raises questions for both my students and experienced divers: nitrox in a rebreather\/closed-cycle rebreather (CCR) \u2013 how does it compare to open-cycle scuba. It [\u2026]<\/p>","protected":false},"author":1,"featured_media":10475,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1600],"tags":[],"class_list":["post-11095","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tehniska-nirsana"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Nir\u0161ana ar rebr\u012bderu (sl\u0113gta cikla rebr\u012bzers\u00a0(CCR)) un nir\u0113ju izpratne par sk\u0101bek\u013ca spiedienu - Daivings.lv<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/daivings.lv\/en\/diving-with-a-rebreather-closed-cycle-rebreather-ccr-and-divers-understanding-of-oxygen-pressure\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nir\u0161ana ar rebr\u012bderu (sl\u0113gta cikla rebr\u012bzers\u00a0(CCR)) un nir\u0113ju izpratne par sk\u0101bek\u013ca spiedienu - Daivings.lv\" \/>\n<meta property=\"og:description\" content=\"Raksts tapis kop\u0101 ar Valteru Preimani, MSDT (Master Scuba Diver Trainer). \u0160odien es v\u0113los piev\u0113rsties t\u0113mai, kas bie\u017ei rada jaut\u0101jumus gan maniem studentiem, gan pieredz\u0113ju\u0161iem nir\u0113jiem: nitrokss rebreather\u012b\/ sl\u0113gta cikla rebr\u012bzers\u00a0(CCR) &#8211; k\u0101 tas izskat\u0101s pret atkl\u0101t\u0101 cikla akvalangu. 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