{"id":237,"date":"2015-11-01T23:16:58","date_gmt":"2015-11-01T23:16:58","guid":{"rendered":"http:\/\/ejektor.co.rs\/?p=237"},"modified":"2017-01-04T17:33:57","modified_gmt":"2017-01-04T17:33:57","slug":"ejector-pumps","status":"publish","type":"post","link":"https:\/\/ejektor.co.rs\/?p=237","title":{"rendered":"EJECTOR PUMPS"},"content":{"rendered":"<p>Ejector pumps are used for drawing-in (pumping), thrusting and transport of all types of liquids, emulsions and suspensions. Pumped and drawn-in liquids can contain gases (air, methane, carbon dioxide etc) and un-dissolved solid grains and pieces of material of different origin and size.<\/p>\n<p>They are used for performing a series of different operations in many fields (industry, construction, waterpower engineering, mining etc.).<\/p>\n<p>Depending on the type of driving fluid they are divided into:<\/p>\n<ul>\n<li>ejector hydro pumps (liquid-liquid)<\/li>\n<li>ejector gas pumps (gas-liquid)<\/li>\n<li>ejector vapor pumps (vapor-liquid)<\/li>\n<\/ul>\n<h2>1.1 1.1 Ejector hydro pumps (liquid-liquid)<\/h2>\n<p>A liquid (most often water) is used as the driving fluid in these pumps. These pumps are widely applied in many fields: for small and large flows (from several l\/h to several thousand m<sup>3<\/sup>\/h), for low and high output pressures (from minimal to &gt; 20 bar), for low and high temperatures, for pumping water from great depths (depths greater than 500 m), for pumping (drawing in) and thrusting liquid with mechanical admixtures of different sizes and origin (see ejector hydro-transport), for pumping (drawing-in) liquid that contain gases, for increasing pumping-in heights of other pumps, for preventing pump cavitation, for transport of warm liquids, for pumping-in and thrusting acid, alkaline and other chemical liquids, emulsions and suspensions with different concentrations and compositions, for performing chemical reactions and other special and individual applications.<\/p>\n<div class=\"container\">\n<div class=\"row\">\n<div class=\"col-md-6 col-xs-12\" style=\"text-align: center;\"><strong><span class=\"picture\"><a href=\"http:\/\/ejektor.co.rs\/wp-content\/uploads\/2015\/09\/dimenzije_ejektor.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-72 aligncenter\" src=\"http:\/\/ejektor.co.rs\/wp-content\/uploads\/2015\/09\/dimenzije_ejektor.jpg\" alt=\"dimenzije_ejektor\" width=\"343\" height=\"160\" \/><\/a>Figure 1 Sketch of an ejector with dimensions<\/span><\/strong><\/div>\n<div class=\"col-md-6 col-xs-12\" style=\"text-align: center;\"><strong><span class=\"picture\"><a href=\"http:\/\/ejektor.co.rs\/wp-content\/uploads\/2015\/11\/pumpe021.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-814 aligncenter\" src=\"http:\/\/ejektor.co.rs\/wp-content\/uploads\/2015\/11\/pumpe021.jpg\" alt=\"pumpe02\" width=\"252\" height=\"160\" \/><\/a>Figure 1.1a Fluid parameters<\/span><\/strong><\/div>\n<\/div>\n<\/div>\n<p>Q<sub>1<\/sub>, Q<sub>2<\/sub> i Q<sub>3<\/sub> \u2013 volume flow in (m<sup>3<\/sup>\/s) or (m<sup>3<\/sup>\/h),<br \/>\n<span class=\"symbol\">r<\/span><sub>1<\/sub>, <span class=\"symbol\">r<\/span><sub>2<\/sub> i <span class=\"symbol\">r<\/span><sub>3<\/sub> \u2013 density in (kg\/m<sup>3<\/sup>),<br \/>\np<sub>1<\/sub>, p<sub>2<\/sub>, i p<sub>3<\/sub> \u2013 pressure in (bar), recommended in (bar<sub>aps<\/sub>)<\/p>\n<p>Index 1 denotes the driving fluid entering the ejector, index 2 the drawn-in liquid at the ejector input and index 3 denotes a mixture of driving fluid and drawn-in liquid at the ejector output<\/p>\n<table border=\"1\" width=\"67%\" cellspacing=\"2\">\n<tbody>\n<tr align=\"center\" bgcolor=\"#99CCFF\">\n<td rowspan=\"2\" align=\"center\" width=\"8%\"><strong>Size<\/strong><\/td>\n<td rowspan=\"2\" width=\"24%\"><strong>Max. flow<br \/>\nQ<sub>3<\/sub> (kg\/h)<\/strong><\/td>\n<td colspan=\"3\"><strong>Attachments<br \/>\nDN<\/strong><\/td>\n<td colspan=\"3\"><strong>Dimension<br \/>\n(mm)<\/strong><\/td>\n<\/tr>\n<tr>\n<td align=\"center\" bgcolor=\"#99CCFF\" width=\"7%\">A<\/td>\n<td align=\"center\" bgcolor=\"#99CCFF\" width=\"10%\">B<\/td>\n<td align=\"center\" bgcolor=\"#99CCFF\" width=\"13%\">C<\/td>\n<td align=\"center\" bgcolor=\"#99CCFF\" width=\"12%\">a<\/td>\n<td align=\"center\" bgcolor=\"#99CCFF\" width=\"12%\">b<\/td>\n<td align=\"center\" bgcolor=\"#99CCFF\" width=\"14%\">c<\/td>\n<\/tr>\n<tr align=\"center\">\n<td>1<\/td>\n<td>1200<\/td>\n<td>20<\/td>\n<td>20<\/td>\n<td>20<\/td>\n<td>40<\/td>\n<td>80<\/td>\n<td>150<\/td>\n<\/tr>\n<tr align=\"center\">\n<td>2<\/td>\n<td>3500<\/td>\n<td>25<\/td>\n<td>20<\/td>\n<td>32<\/td>\n<td>60<\/td>\n<td>85<\/td>\n<td>270<\/td>\n<\/tr>\n<tr align=\"center\">\n<td>3<\/td>\n<td>6000<\/td>\n<td>32<\/td>\n<td>25<\/td>\n<td>40<\/td>\n<td>65<\/td>\n<td>100<\/td>\n<td>350<\/td>\n<\/tr>\n<tr align=\"center\">\n<td>4<\/td>\n<td>12000<\/td>\n<td>40<\/td>\n<td>32<\/td>\n<td>50<\/td>\n<td>70<\/td>\n<td>115<\/td>\n<td>410<\/td>\n<\/tr>\n<tr align=\"center\">\n<td>5<\/td>\n<td>24000<\/td>\n<td>50<\/td>\n<td>40<\/td>\n<td>65<\/td>\n<td>80<\/td>\n<td>125<\/td>\n<td>480<\/td>\n<\/tr>\n<tr align=\"center\">\n<td>6<\/td>\n<td>32000<\/td>\n<td>65<\/td>\n<td>40<\/td>\n<td>65<\/td>\n<td>80<\/td>\n<td>125<\/td>\n<td>480<\/td>\n<\/tr>\n<tr align=\"center\">\n<td>7<\/td>\n<td>40000<\/td>\n<td>65<\/td>\n<td>50<\/td>\n<td>80<\/td>\n<td>80<\/td>\n<td>125<\/td>\n<td>530<\/td>\n<\/tr>\n<tr align=\"center\">\n<td>8<\/td>\n<td>70000<\/td>\n<td>80<\/td>\n<td>65<\/td>\n<td>100<\/td>\n<td>115<\/td>\n<td>135<\/td>\n<td>730<\/td>\n<\/tr>\n<tr align=\"center\">\n<td>9<\/td>\n<td>100000<\/td>\n<td>100<\/td>\n<td>80<\/td>\n<td>125<\/td>\n<td>150<\/td>\n<td>165<\/td>\n<td>950<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Ejectors are produced with flanges, a threaded fastener and attachments for connecting with rubber or plastic tubes.<\/p>\n<p>When ordering an ejector the following data needs to be given:<\/p>\n<ul>\n<li>density <span class=\"symbol\">r<\/span><sub>1<\/sub>and <span class=\"symbol\">r<\/span><sub>2<\/sub> in (kg\/m<sup>3<\/sup>),<\/li>\n<li>mass flow m<sub>1<\/sub> and m<sub>2<\/sub> or at least one of them in kg\/s or kg\/h or volume flow Q<sub>1<\/sub> and Q<sub>2<\/sub> or at least of them in m<sup>3<\/sup>\/s or m<sup>3<\/sup>\/h,<\/li>\n<li>of the three pressures p<sub>1<\/sub>, p<sub>2<\/sub> and p<sub>3<\/sub> two must be set (bar or bar<sub>abs<\/sub>),<\/li>\n<li>if all three pressures are set than only one mass or volume flow can be set (see figure 1 and 1a).<\/li>\n<\/ul>\n<p><strong><dfn>Example 1.1<\/dfn><\/strong><\/p>\n<p><dfn>Data:<\/dfn> The pumped water has a flow of m<sub>2<\/sub>=12.4 t\/h, density r<sub>2<\/sub>=1.2 t\/m<sup>3<\/sup>, pressure p<sub>2<\/sub>=1.2 bar<sub>abs<\/sub> (the ejector is set 2 m below the level of the pumped liquid). The driving liquid has a flow of m<sub>1<\/sub>=20 t\/h and density r<sub>1<\/sub>=1 t\/m<sup>3<\/sup>. The pressure required at the ejector output p<sub>3<\/sub>=2.5 bar<sub>abs<\/sub>. The pressure of the driving liquid p<sub>1<\/sub> needs to be determined.<\/p>\n<p><dfn>Solution:<\/dfn> for m = m<sub>2<\/sub>\/m<sub>1<\/sub>=12,4\/20 = 0,62 and <span class=\"symbol\">r<\/span><sub>2<\/sub>\/<span class=\"symbol\">r<\/span> =1,2\/1=1,2<\/p>\n<p>From the diagram one can read <span class=\"symbol\">y<\/span> = 0,305 and <span class=\"symbol\">h<\/span> = 0,24.<\/p>\n<p>p<sub>1<\/sub> = p<sub>2<\/sub> + (p<sub>3<\/sub> \u2013 p<sub>2<\/sub>) \/ <span class=\"symbol\">y<\/span> =1,2 + (2,5 \u20131,2) \/ 0,31 = 5,4 bar<sub>aps<\/sub> (4,4 bar)<\/p>\n<p><strong><dfn>Example 1.2<\/dfn><\/strong><\/p>\n<p>All data is the same as in example 1.1 only the ejector is placed 2 m above the pumped liquid level i.e. the pumped water pressure at the ejector input is p<sub>2<\/sub>=0.8 bar<sub>abs<\/sub> (0.2 bar vacuum).<\/p>\n<p><dfn>Solution:<\/dfn> for m = 0,62; <span class=\"symbol\">r<\/span><sub>2<\/sub>\/<span class=\"symbol\">r<\/span> =1,2, and for <span class=\"symbol\">y<\/span> = 0,305 the required driving liquid pressure is<\/p>\n<p>p<sub>1<\/sub> = p<sub>2<\/sub>+ (p<sub>3<\/sub> \u2013 p<sub>2<\/sub>) \/ <span class=\"symbol\">y<\/span> = 0,8 + (2,5 \u2013 0,8) \/ 0,31 = 6,28 bar<sub>aps<\/sub> (5,28 bar)<\/p>\n<p>The utilization coefficient is the same as in example 1.1 <span class=\"symbol\">h<\/span> = 0,24.<\/p>\n<table width=\"100%\">\n<tbody>\n<tr>\n<td align=\"center\"><a href=\"http:\/\/ejektor.co.rs\/wp-content\/uploads\/2015\/11\/pumpe031.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-815 aligncenter\" src=\"http:\/\/ejektor.co.rs\/wp-content\/uploads\/2015\/11\/pumpe031.jpg\" alt=\"pumpe03\" width=\"299\" height=\"164\" \/><\/a><\/td>\n<\/tr>\n<tr>\n<td align=\"center\"><span class=\"picture\">m = m<sub>2<\/sub>\/m<sub>1<\/sub>(kg<sub>sunctioned liquid <\/sub>\/kg<sub>driving liquid<\/sub>)<\/span><\/td>\n<\/tr>\n<tr>\n<td align=\"center\"><a href=\"http:\/\/ejektor.co.rs\/wp-content\/uploads\/2015\/11\/pumpe041.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-816 aligncenter\" src=\"http:\/\/ejektor.co.rs\/wp-content\/uploads\/2015\/11\/pumpe041.jpg\" alt=\"pumpe04\" width=\"299\" height=\"85\" \/><\/a><\/td>\n<\/tr>\n<tr>\n<td align=\"center\"><strong><span class=\"picture\">Figure 1.2 Variants for pump and ejector connection<\/span><\/strong><\/td>\n<\/tr>\n<tr>\n<td align=\"center\"><a href=\"http:\/\/ejektor.co.rs\/wp-content\/uploads\/2015\/11\/pumpe051.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-817 aligncenter\" src=\"http:\/\/ejektor.co.rs\/wp-content\/uploads\/2015\/11\/pumpe051.jpg\" alt=\"pumpe05\" width=\"300\" height=\"53\" \/><\/a><\/td>\n<\/tr>\n<tr>\n<td align=\"center\"><strong><span class=\"picture\">Figure 1.3 Ejector transport of dirty and muddy liquids<\/span><\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>Ejector pumps are used for drawing-in (pumping), thrusting and transport of all types of liquids, emulsions and suspensions. Pumped and drawn-in liquids can contain gases (air, methane, carbon dioxide etc) and un-dissolved solid grains and pieces of material of different origin and size. They are used for performing a series of different operations in many [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[14],"tags":[],"language":[4],"class_list":["post-237","post","type-post","status-publish","format-standard","hentry","category-ejector-types","language-en_gb"],"acf":[],"_links":{"self":[{"href":"https:\/\/ejektor.co.rs\/index.php?rest_route=\/wp\/v2\/posts\/237","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ejektor.co.rs\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ejektor.co.rs\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ejektor.co.rs\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ejektor.co.rs\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=237"}],"version-history":[{"count":19,"href":"https:\/\/ejektor.co.rs\/index.php?rest_route=\/wp\/v2\/posts\/237\/revisions"}],"predecessor-version":[{"id":819,"href":"https:\/\/ejektor.co.rs\/index.php?rest_route=\/wp\/v2\/posts\/237\/revisions\/819"}],"wp:attachment":[{"href":"https:\/\/ejektor.co.rs\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=237"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ejektor.co.rs\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=237"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ejektor.co.rs\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=237"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/ejektor.co.rs\/index.php?rest_route=%2Fwp%2Fv2%2Flanguage&post=237"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}