{"id":2139,"date":"2014-10-11T21:19:37","date_gmt":"2014-10-11T21:19:37","guid":{"rendered":"http:\/\/medusamarine.co.uk\/?p=2139"},"modified":"2019-09-02T21:19:47","modified_gmt":"2019-09-02T21:19:47","slug":"what-is-electronic-rig-testing-and-how-does-it-work","status":"publish","type":"post","link":"https:\/\/medusamarine.co.uk\/index.php\/what-is-electronic-rig-testing-and-how-does-it-work\/","title":{"rendered":"What is electronic rig testing? how does it work? is it worth doing?"},"content":{"rendered":"<p>The principle of electronic rig testing is to pass a current through a swage terminal and measure the resistance increase caused by possible broken strands or corrosion hidden within the swage. As the tested<strong>   c<\/strong>onductor is stainless steel the resistance will be very low in the order of micro ohms and this requires a specialised 4 wire Kelvin Bridge micro ohm meter.<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p>First the resistance is measured along a section of the wire stay approximately 5 cms apart, then a second reading is taken between the wire and the end of the swage terminal also 5 cms apart. In theory in the second test the swage itself is forming a perfect, almost zero resistance joint with the wire and so the two readings will read the same. Any wide variation may prove a possible fault hidden within the swage. In practice it is considered a pass if the two readings are within 10% of each other.<\/p>\n<p>&nbsp;<\/p>\n<p>The majority of rig failures are at the joint of the swage due to the anaerobic corrosive effects of salt water settling in the open end. Also this section is most likely to suffer work hardening and embrittlement as any harmonic vibration in the wire will cause the wire to flex over its length but it will bend sharply at the joint as the wire is trapped within.<\/p>\n<p>&nbsp;<\/p>\n<p>The test is not infallible as the resistances are very low and anomalous results can be generated by other factors. It should be taken as an additional indicator in combination with other tests, visual inspections etc to produce an overall view of the integrity of a rig. The test is most useful when made as a trend analysis where a test is carried out every year and the results recorded. In this way a progressive deterioration can be spotted before failure occurs.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The principle of electronic rig testing is to pass a current through a swage terminal and measure the resistance increase caused by possible broken strands or corrosion hidden within the swage. As the tested conductor is stainless steel the resistance will be very low in the order of micro ohms and this requires a specialised [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"quote","meta":[],"categories":[57],"tags":[],"_links":{"self":[{"href":"https:\/\/medusamarine.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/2139"}],"collection":[{"href":"https:\/\/medusamarine.co.uk\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/medusamarine.co.uk\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/medusamarine.co.uk\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/medusamarine.co.uk\/index.php\/wp-json\/wp\/v2\/comments?post=2139"}],"version-history":[{"count":2,"href":"https:\/\/medusamarine.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/2139\/revisions"}],"predecessor-version":[{"id":2143,"href":"https:\/\/medusamarine.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/2139\/revisions\/2143"}],"wp:attachment":[{"href":"https:\/\/medusamarine.co.uk\/index.php\/wp-json\/wp\/v2\/media?parent=2139"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/medusamarine.co.uk\/index.php\/wp-json\/wp\/v2\/categories?post=2139"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/medusamarine.co.uk\/index.php\/wp-json\/wp\/v2\/tags?post=2139"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}