{"id":4293,"date":"2017-02-26T16:54:17","date_gmt":"2017-02-26T15:54:17","guid":{"rendered":"http:\/\/www.l-plan.si\/en\/?p=4293"},"modified":"2017-02-26T16:56:21","modified_gmt":"2017-02-26T15:56:21","slug":"why-is-electric-motor-drive-better-then-hydraulic-in-the-case-of-on-line-psv-testing","status":"publish","type":"post","link":"https:\/\/www.l-plan.si\/en\/why-is-electric-motor-drive-better-then-hydraulic-in-the-case-of-on-line-psv-testing\/","title":{"rendered":"Why is electric motor drive  better then hydraulic in the case of on-line PSV testing?"},"content":{"rendered":"[vc_row][vc_column][vc_column_text css=&#8221;.vc_custom_1488124577715{padding-right: 20px !important;padding-left: 20px !important;}&#8221;]For on-line pressure safety valves testing, motor drive have several advantages verso hydraulic drives. Here are some explanations on your questions raised:<\/p>\n<p><span style=\"color: #993366;\">The safety valve is not closed after the test. We don\u2019t have enough difference between system working pressure and safety valve opening point! How to overcome this unpleasant situation?<\/span><\/p>\n<p style=\"padding-left: 30px;\">Yes, this is large benefit of Legatest drive fast response. How?<\/p>\n<p style=\"padding-left: 30px;\">Legatest technology and fast response allows fast determination of safety valve opening pressure while the expansion of steam power does not constitute such a force on the valve plug parts that would lead to full stroke. In this point the valve plug fast turn back to the valve seat.<\/p>\n<p style=\"padding-left: 30px;\">In this case there is much less possibility of contamination of the valve and consequently leaks after the test.<\/p>\n<p style=\"padding-left: 30px;\">Also the system pressure and medium losses are smaller.<\/p>\n<p style=\"padding-left: 30px;\">However, acoustic sensor technology allowed the determination of leakage differences before and after the on-line test.<\/p>\n<p><span style=\"color: #993366;\">Opening pressure is sometimes hard to determine when the hidraulic drive is used. Why?<\/span><\/p>\n<p style=\"padding-left: 30px;\">Motor drive has superior dynamic properties which reflect the following characteristic:<\/p>\n<ul>\n<li>Better control of pulling force.<\/li>\n<li>No negative hydraulic influences which may prevent proper and accurate determination of safety valve opening pressure and other functional characteristics.<\/li>\n<\/ul>\n<p><span style=\"color: #993366;\">How motor drive influences on safety of work?<\/span><\/p>\n<p style=\"padding-left: 30px;\">Because of motor consumption monitoring and factory calibration with force, some advantages have been made:<\/p>\n<ul>\n<li><strong>System overload protection<\/strong> &#8211; the maximum motor pulling force is mechanically limited so that the respective deign values of the components are not exceeded<\/li>\n<li><strong>Power monitoring<\/strong> &#8211; an electronic system monitors if the supplied current and tension meet the requirements of the test conditions<\/li>\n<li><strong>Power calibrating function <\/strong>\u2013 protect the system in the case of force sensor failure indication with factory calibration (comparison) of motor electric consumption with force chain values.<\/li>\n<\/ul>\n<p><span style=\"color: #993366;\">The valves are sometimes installed in very inaccessible areas. Management of the test should be done so by vast distances.<\/span><\/p>\n<p style=\"padding-left: 30px;\">Legatest motor drive technology enables management and monitoring the test on a long distance (standard 50 m, 10mm or longer is possible).\u00a0Communication connection between PC and Legatest drive with cables diameter 4 mm is quickly and easily unlike thick hydraulic hoses.<\/p>\n<p style=\"padding-left: 30px;\">Communication speed is 30 ms in opposite of hydraulic slower response and hysteresis.<\/p>\n<p style=\"padding-left: 30px;\">Slow communication reduces on-line testing safety!<\/p>\n<p><span style=\"color: #993366;\">The on-line testing with Legatest could be extremely effective due implemented technology and design parts.<\/span><\/p>\n<p style=\"padding-left: 30px;\">28 safety valves on line testing in one day \u2013 Legatest client record from Germany.<\/p>\n<p style=\"padding-left: 30px;\">Using the hydraulic device, these safety, accuracy and useful features cannot be implemented.<\/p>\n<p><span style=\"color: #993366;\">How is the power supply? In some environments it is difficult to access or prohibited because of potentially explosive areas\u2026<\/span><\/p>\n<p style=\"padding-left: 30px;\">Legatest device is power autonomous. Near motor drive accumulator batteries are mounted. With full charged batteries 200 normal on-line safety valves tests can be implemented (50 tests up to 50 kN).<\/p>\n<p style=\"padding-left: 30px;\">Legatest device can be use in potentially explosive atmospheres according to directive 94\/9\/EC, approvals include:<\/p>\n<ul>\n<li>EC Type Examination Certificate Nr: SIQ 11 ATEX 134 X for Ex cones: II 2 G Ex d(ib) ib IIC T4 Gb<\/li>\n<li>Under manufacturing, each device separately is approved: Certificate of Conformity Nr: LT III Eex\u2026.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.l-plan.si\/en\/products\/legatest\/\">See more about In-Situ Safety Relief Valves Testing&#8230;<\/a><\/p>\n<p>Bo\u017eo Legat<\/p>\n[\/vc_column_text][\/vc_column][\/vc_row]\n","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_column_text css=&#8221;.vc_custom_1488124577715{padding-right: 20px !important;padding-left: 20px !important;}&#8221;]For on-line pressure safety valves testing, motor drive have several advantages verso hydraulic drives. Here are some explanations on your questions raised: The safety valve is not closed after the test. We don\u2019t have enough &hellip;<\/p>\n","protected":false},"author":5,"featured_media":4070,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[84],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.l-plan.si\/en\/wp-json\/wp\/v2\/posts\/4293"}],"collection":[{"href":"https:\/\/www.l-plan.si\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.l-plan.si\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.l-plan.si\/en\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.l-plan.si\/en\/wp-json\/wp\/v2\/comments?post=4293"}],"version-history":[{"count":2,"href":"https:\/\/www.l-plan.si\/en\/wp-json\/wp\/v2\/posts\/4293\/revisions"}],"predecessor-version":[{"id":4295,"href":"https:\/\/www.l-plan.si\/en\/wp-json\/wp\/v2\/posts\/4293\/revisions\/4295"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.l-plan.si\/en\/wp-json\/wp\/v2\/media\/4070"}],"wp:attachment":[{"href":"https:\/\/www.l-plan.si\/en\/wp-json\/wp\/v2\/media?parent=4293"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.l-plan.si\/en\/wp-json\/wp\/v2\/categories?post=4293"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.l-plan.si\/en\/wp-json\/wp\/v2\/tags?post=4293"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}