{"id":3633,"date":"2014-07-10T12:29:32","date_gmt":"2014-07-10T11:29:32","guid":{"rendered":"https:\/\/www.ultraflux.net\/mesure-de-debit-sur-conduite-en-charge-2\/"},"modified":"2015-05-29T15:05:34","modified_gmt":"2015-05-29T14:05:34","slug":"full-pipe-flow-rate-measurement","status":"publish","type":"page","link":"https:\/\/www.ultraflux.net\/en\/expertise\/full-pipe-flow-rate-measurement\/","title":{"rendered":"Full pipe flow rate measurement"},"content":{"rendered":"<ul class=\"gallery\"><li class=\"active image-1\"><p><img width=\"1000\" height=\"1000\" src=\"https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Mesure-de-d\u00e9bit-sur-conduite-GRP-1000x1000.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" srcset=\"https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Mesure-de-d\u00e9bit-sur-conduite-GRP-1000x1000.jpg 1000w, https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Mesure-de-d\u00e9bit-sur-conduite-GRP-1000x1000-150x150.jpg 150w, https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Mesure-de-d\u00e9bit-sur-conduite-GRP-1000x1000-300x300.jpg 300w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><\/li><\/ul><nav id=\"gallery-nav\"><ul class=\"gallery-nav\"><li class=\"active image-1\"><p><\/p><\/li><\/ul><\/nav>\n<div class=\"block_enhanced\"><p>\nA full pipe (or pressure conduit) is a circular pipe entirely filled with <strong>liquid<\/strong> or <strong>gas<\/strong> fluid.<\/p>\n<\/div>\n<div class=\"block\"><div class=\"title\">Choice of probe<\/div><div class=\"text\"><div class=\"text-container\"><p>\nThe probes used for taking the measurements can be external (clamp-on) or intrusive.<br \/>\n<strong>Clamp-on probes<\/strong> are designed for temporary measurements but can also be used for permanent measurements because they are safe and easy to install.<br \/>\n<strong>Intrusive probes<\/strong> can be divided into two categories: fixed probes, which are installed where there is an absence of pressure, and probes that can be removed under pressure.<\/p>\n<p>&#8211;&gt; These categories of probes can be used to take <strong>mono-chord<\/strong> or <strong>multi-chord<\/strong> measurements.<\/p>\n<\/div><\/div><\/div>\n<div class=\"block\"><div class=\"title\">Mono-chord system<\/div><div class=\"text\"><div class=\"text-container\"><p>\nA measuring point in the mono-chord system is made up of:<\/p>\n<ul>\n<li>1 converter<\/li>\n<li>1 chord = 2 probes (marked as A and B on the diagram)<\/li>\n<\/ul>\n<table>\n<tbody>\n<tr>\n<td>\u00a0<img decoding=\"async\" loading=\"lazy\" class=\"alignnone  wp-image-2505\" src=\"https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Mesure-monocorde-avec-sondes-\u00e0-insertion-225x253.jpg\" alt=\"Mesure monocorde avec sondes \u00e0 insertion\" width=\"183\" height=\"206\" \/><\/td>\n<td><img decoding=\"async\" loading=\"lazy\" class=\"alignnone  wp-image-3996\" src=\"https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Principe-de-mesure-sonde-a-insertion_gb_342x251-300x220.jpg\" alt=\"Measurement principle with insertion probes\" width=\"260\" height=\"191\" srcset=\"https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Principe-de-mesure-sonde-a-insertion_gb_342x251-300x220.jpg 300w, https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Principe-de-mesure-sonde-a-insertion_gb_342x251.jpg 342w\" sizes=\"(max-width: 260px) 100vw, 260px\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>A and B <strong>probes<\/strong> are both <strong>transmitters<\/strong> and <strong>receivers<\/strong>. They <strong>alternately<\/strong> transmit to one other. The acoustic signal that spreads through the fluid is collected by the opposite probe.<br \/>\nThe Upstream\/Downstream and Downstream\/Upstream <strong>propagation times<\/strong> are precisely measured (typically 0.2 ns).<br \/>\nThe <strong>average speed<\/strong> along the acoustic path can be calculated using <strong>these times<\/strong> and the <strong>geometric position<\/strong> of the probes.<\/p>\n<\/div><\/div><\/div>\n<div class=\"block\"><div class=\"title\">Multi-chord system<\/div><div class=\"text\"><div class=\"text-container\"><p>\nMono-chord measurements can be used in the assumption that the velocity profile at the measuring point is symmetrical relative to the axis of the pipe.\u00a0Using <strong>multi-chord<\/strong> measurements makes it easier to i<strong>ntegrate speed profile irregularities<\/strong>.\u00a0As such, <strong>multi-chord measurements<\/strong> can be used on <strong>straight lengths that are shorter<\/strong> than those required for mono-chord measurements.<\/p>\n<table>\n<tbody>\n<tr>\n<td><img decoding=\"async\" loading=\"lazy\" class=\"alignnone  wp-image-1734\" src=\"https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Sondes-\u00e0-insertion-sur-conduite-305x339-269x300.jpg\" alt=\"Sondes \u00e0 insertion sur conduite\" width=\"192\" height=\"214\" srcset=\"https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Sondes-\u00e0-insertion-sur-conduite-305x339-269x300.jpg 269w, https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Sondes-\u00e0-insertion-sur-conduite-305x339.jpg 305w\" sizes=\"(max-width: 192px) 100vw, 192px\" \/><\/td>\n<td><img decoding=\"async\" loading=\"lazy\" class=\"alignnone  wp-image-1735\" src=\"https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Sonde-\u00e0-insertion-conduite-300x202.jpg\" alt=\"Sondes \u00e0 insertion &amp; conduite\" width=\"258\" height=\"174\" srcset=\"https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Sonde-\u00e0-insertion-conduite-300x202.jpg 300w, https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Sonde-\u00e0-insertion-conduite.jpg 342w\" sizes=\"(max-width: 258px) 100vw, 258px\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\n<\/div><\/div><\/div>\n<div class=\"block\"><div class=\"title\">Calculation method<\/div><div class=\"text\"><div class=\"text-container\"><p>\n<img decoding=\"async\" loading=\"lazy\" class=\"alignnone  wp-image-3788\" src=\"https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/M\u00e9thode-de-calcul-centr\u00e9e.jpg\" alt=\"Calculation method\" width=\"231\" height=\"180\" \/><\/p>\n<table>\n<tbody>\n<tr>\n<td><img decoding=\"async\" loading=\"lazy\" class=\"alignnone  wp-image-3998\" src=\"https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Flow-measurement-1-gb-342x209-300x183.jpg\" alt=\"Flow measurement with clamp-on probes\" width=\"223\" height=\"136\" srcset=\"https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Flow-measurement-1-gb-342x209-300x183.jpg 300w, https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Flow-measurement-1-gb-342x209.jpg 342w\" sizes=\"(max-width: 223px) 100vw, 223px\" \/><\/td>\n<td><img decoding=\"async\" loading=\"lazy\" class=\"alignnone  wp-image-4000\" src=\"https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Flow-measurement-principle-gb-342x209-300x183.jpg\" alt=\"Flow measurement with external probes\" width=\"229\" height=\"139\" srcset=\"https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Flow-measurement-principle-gb-342x209-300x183.jpg 300w, https:\/\/www.ultraflux.net\/wp-content\/uploads\/2014\/07\/Flow-measurement-principle-gb-342x209.jpg 342w\" sizes=\"(max-width: 229px) 100vw, 229px\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"text-decoration: underline;\">With<\/span>:<\/p>\n<p><strong>T<sub>AB<\/sub><\/strong>:\u00a0propagation time of the ultrasonic wave from probe A to probe B<br \/>\n<strong>C<\/strong>: speed of sound<br \/>\n<strong>V<sub>US<\/sub><\/strong>: velocity or\u00a0average speed on the ultrasonic path<br \/>\n<strong>Kh<\/strong>:\u00a0hydraulic coefficient<br \/>\n<strong>Q<\/strong>: flow<br \/>\n<strong>D<\/strong>: Axial distance or D<sub>axe<\/sub>\u00a0(projected acoustic path along the pipe axis)<br \/>\n<strong>S<\/strong>: Section<\/p>\n<p>\n<\/div><\/div><\/div>\n<div class=\"block_enhanced\"><p>\n<span style=\"font-size: 13px;\"><em>Discover our products for full pipes:<br \/>\n<a title=\"Flowmeters for liquids \u2013 full pipes\" href=\"https:\/\/www.ultraflux.net\/en\/products\/flowmeters-for-liquids-full-pipes\/\" target=\"_blank\">Flow meters for liquids<\/a> &amp; <a title=\"Flowmeters \u2013 gas applications\" href=\"https:\/\/www.ultraflux.net\/en\/flowmeters-gas-applications\/\" target=\"_blank\">flow meters for gas<\/a>.<\/em><\/span><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":3,"featured_media":0,"parent":5588,"menu_order":10,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Full pipe flow rate measurement | Ultraflux - flow meters<\/title>\n<meta name=\"description\" content=\"Discover the principle of ultrasonic flow rate measurement for full pipes : liquid or gas fluid. 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