{"id":241,"date":"2009-11-06T12:12:58","date_gmt":"2009-11-06T16:12:58","guid":{"rendered":"http:\/\/www.divetalking.com\/?p=241"},"modified":"2021-06-07T20:46:03","modified_gmt":"2021-06-08T00:46:03","slug":"what-is-my-pressure-group","status":"publish","type":"post","link":"https:\/\/www.divetalking.com\/?p=241","title":{"rendered":"What is my Pressure Group?"},"content":{"rendered":"\n<p>This article addresses how to calculate your Pressure Group after a<br>the 2nd or 3rd dive.<\/p>\n\n\n\n<p>I thought this subject would be a good one. As an Instructor, one of<br>the most common problems I find individuals having is calculating<br>the correct Pressure Group at the end of a second or third, etc. dive.<\/p>\n\n\n\n<p>In my blogs on RDP, I showed you a little on <a href=\"https:\/\/www.divetalking.com\/?p=7384\" target=\"_blank\" rel=\"noopener\">how to use an RDP. <\/a>We will&nbsp; now work through an exercise that will demonstrate how to correctly<br>identify the pressure group you will be in at the end of your dive.<\/p>\n\n\n\n<p>Pull out the AIR RDP. The process is the same for any RDP. We will start<br>this subject at the end of your first dive.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" src=\"https:\/\/www.divetalking.com\/wp-content\/uploads\/2009\/11\/AIR-RDP.jpg\" alt=\"\" data-id=\"118\" data-link=\"https:\/\/www.divetalking.com\/?attachment_id=118\" class=\"wp-image-118\"\/><\/figure><\/li><\/ul><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"860\" height=\"587\" src=\"https:\/\/www.divetalking.com\/wp-content\/uploads\/2009\/11\/padiplanner2.jpg\" alt=\"\" class=\"wp-image-133\" srcset=\"https:\/\/www.divetalking.com\/wp-content\/uploads\/2009\/11\/padiplanner2.jpg 860w, https:\/\/www.divetalking.com\/wp-content\/uploads\/2009\/11\/padiplanner2-250x170.jpg 250w\" sizes=\"auto, (max-width: 860px) 100vw, 860px\" \/><figcaption>Table #3<\/figcaption><\/figure>\n\n\n\n<p>Let us begin<\/p>\n\n\n\n<p>You just complete your first dive of the day and ended in a Pressure<br>Group <strong>M<\/strong>.&nbsp; During your time on the surface someone mentioned going to a wreck for the next dive. You plan a second dive to 57 feet to check out a<br>new wreck and wish to spend 30 minutes on the dive. After spending time on the surface, you plan to &nbsp;enter &nbsp;the water for the second dive at a Pressure Group of <strong>D<\/strong>.<\/p>\n\n\n\n<p>Questions:<\/p>\n\n\n\n<p><span style=\"color: #ff9900;\"><span class=\"has-inline-color has-vivid-red-color\">(A)<\/span><\/span>: How much surface interval time do you need to spend to move<br>from Pressure Group M to Pressure Group D?<\/p>\n\n\n\n<p>&nbsp;You complete the second dive to 57 feet for 30 minutes.<br><span style=\"color: #ff9900;\"><span class=\"has-inline-color has-vivid-red-color\">(B)<\/span><\/span>: What Pressure Group are you in when you end your second dive?<\/p>\n\n\n\n<p><strong>Calculate the answers to the questions above before looking further in this post.<\/strong><\/p>\n\n\n\n<p>&#8211;<br>&#8211;<br>&#8211;<br>&#8211;<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>Answers<\/strong>:<br>(A): You must spend between 56 minutes to 1 hour and 4 minutes to move from pressure group M to pressure group D.<br><br>(B): Your answer should be <strong>S<\/strong>. Did you forget to round up on table 3 and table 1? Your second&nbsp; dive was to 57 feet. There is no 57 on table 3, you need to round up to the 60 foot depth. Moving to the box where 60 feet meets pressure group D,&nbsp; you find&nbsp; 16\/39. The 16 represents Nitrogen still remaining in the body in the form of time.&nbsp; It is the 16 you must add to your 30 minutes of Actual Bottom Time for your second dive.&nbsp; <\/p>\n\n\n\n<p>Using Table 1, you find the 60 foot column, and move down until you find the sum of 30+16, 46. There is no 46 minute box in the 60 foot column and you round up to the next number which in this case is 47. The Pressure Group at 47 minutes at 60 feet is S.<\/p>\n\n\n\n<p>Larry Davis<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This article addresses how to calculate your Pressure Group after athe 2nd or 3rd dive.<\/p>\n<p>I thought this subject would be a good one. As an Instructor, one ofthe most common problems I find individuals having is calculatingthe correct Pressure Group at the end of a second or third, etc. dive.<\/p>\n<p>In my blogs on RDP, I showed you a little on how to use an RDP. We will&nbsp; now work through an exercise that will demonstrate how to correctlyidentify the pressure group you will be in at the end of your dive.<\/p>\n<p>Pull out the AIR RDP. The process is the same for any RDP. We will startthis subject at the end of your first dive.<\/p>\n<p>Table #3<\/p>\n<p>Let us begin<\/p>\n<p>You just complete your first dive of the day and ended in a PressureGroup M.&nbsp; During your time on the surface someone mentioned going to a wreck for the next dive. You plan a &#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-241","post","type-post","status-publish","format-standard","hentry","category-training"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.1 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What is my Pressure Group? - Divetalking<\/title>\n<meta name=\"description\" content=\"Divetalking\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.divetalking.com\/?p=241\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is my Pressure Group?\" \/>\n<meta property=\"og:description\" content=\"Divetalking\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.divetalking.com\/?p=241\" \/>\n<meta property=\"og:site_name\" content=\"Divetalking\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Divetalking\" \/>\n<meta property=\"article:published_time\" content=\"2009-11-06T16:12:58+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-06-08T00:46:03+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.divetalking.com\/wp-content\/uploads\/2009\/11\/AIR-RDP.jpg\" \/>\n<meta name=\"author\" content=\"lars2923\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"lars2923\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/?p=241#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/?p=241\"},\"author\":{\"name\":\"lars2923\",\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/#\\\/schema\\\/person\\\/e69ad3ca673a5c117fd560ec0f30453c\"},\"headline\":\"What is my Pressure Group?\",\"datePublished\":\"2009-11-06T16:12:58+00:00\",\"dateModified\":\"2021-06-08T00:46:03+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/?p=241\"},\"wordCount\":414,\"image\":{\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/?p=241#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/www.divetalking.com\\\/wp-content\\\/uploads\\\/2009\\\/11\\\/AIR-RDP.jpg\",\"articleSection\":[\"Training\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.divetalking.com\\\/?p=241\",\"url\":\"https:\\\/\\\/www.divetalking.com\\\/?p=241\",\"name\":\"What is my Pressure Group? 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