{"id":239,"date":"2021-05-28T16:47:19","date_gmt":"2021-05-28T16:47:19","guid":{"rendered":"https:\/\/magnatexpumps.com\/blog\/?p=239"},"modified":"2021-06-02T12:20:41","modified_gmt":"2021-06-02T12:20:41","slug":"how-long-can-i-dry-run-my-pump-and-will-it-survive-enhancing-sic-bearings","status":"publish","type":"post","link":"https:\/\/magnatexpumps.com\/blog\/how-long-can-i-dry-run-my-pump-and-will-it-survive-enhancing-sic-bearings\/","title":{"rendered":"How Long Can I Dry Run My Pump and Will it Survive?  |  Enhancing SiC Bearings"},"content":{"rendered":"\n<p> In a previous article, we explored why, ideally,<strong> <\/strong><a href=\"https:\/\/magnatexpumps.com\/blog\/how-long-can-i-run-my-pump-dry\/\"><strong>a pump should not endure dry running<\/strong><\/a>.  Let\u2019s now examine if a pump CAN survive dry running under system upset conditions. <\/p>\n\n\n\n<p>SiC bearing material does not tolerate mechanical shock,\nwhich is what occurs when there is insufficient lubricating liquid between the\nbearing component surfaces, leading to contact between the components. There\nare several situations during system operation that can produce such\nconditions.<\/p>\n\n\n\n<h2>What are Some Common Upset Conditions?<\/h2>\n\n\n\n<p>The following are considered system upset conditions, during\nwhich the bearing lubricating film barrier is compromised:<\/p>\n\n\n\n<p>\u2022 operation of the pump with valves closed<\/p>\n\n\n\n<p>\u2022 insufficient pressure at the pump suction (inadequate net\npositive suction head available [NPSHa]) causing cavitation<\/p>\n\n\n\n<p>\u2022 extended periods of operation at extremely low flow\nconditions<\/p>\n\n\n\n<p>\u2022 extended periods of operation at high flow conditions with\nlow pressure resistance at discharge\u2014operation \u201coff the curve\u201d or beyond the\nmaximum flow range<\/p>\n\n\n\n<p>\u2022 excessive cycling of system flow from one flow rate to\nanother<\/p>\n\n\n\n<p>\u2022 excessive temperature that causes pumped liquid\n(lubricating flow) to vaporize at the bearing component surfaces\u2014or not enough\ninternal system pressure to keep the pumped fluid in liquid state as it passes\nthrough the pump<\/p>\n\n\n\n<p>\u2022 energizing motor without liquid in the pump, including\nbriefly to check rotation<\/p>\n\n\n\n<p>\u2022 plugged impeller vane inlet at suction eye<\/p>\n\n\n\n<h2>Enhancing SiC Bearings<\/h2>\n\n\n\n<p><style> img {   float: right; } <\/style><img decoding=\"async\" src=\"https:\/\/magnatexpumps.com\/blog\/wp-content\/uploads\/2021\/05\/SiC-X-Bearing.png\" alt=\"SiC-X Bearing (enhanced)\" style=\"width:251px;height:128px;margin-left:15px;\"><a href=\"https:\/\/magnatexpumps.com\/blog\/dry-run-resistant-bearings.php\"><strong>Specially treated sintered SiC-X bearings<\/strong><\/a> are available from Magnatex to provide enhanced dry-running capabilities in the case of a system upset condition. All of these are called diamondlike coatings (DLC). Some manufacturers use coatings that adhere to the substrate SiC, while Magnatex uses infusion methods that mechanically integrate the coating into the base material. Integrating the diamond-like substance into the bearing ensure that the bearing will last longer verses those that simply coat the bearings&#8217; surface.  These treatments substantially reduce the surface coefficient of friction compared to that of standard sintered SiC. Less friction during system upset and other dry run conditions generate less heat, reducing the potential for bearing component breakage from mechanical contact or thermal shock.<\/p>\n\n\n\n<p>In reference to pumping equipment and product lubricated\nbearings, no one recommends that the pump be operated without liquid passing\nthrough it. There is some residual liquid that remains when the unit loses\nsuction but that will quickly be pressed out of the sides of the bearing\ncomponents with continued operation. Vaporization of the liquid can occur\nquickly depending on the size of the pump.<\/p>\n\n\n\n<h2>How Long Can Enhanced SiC Bearings Last?<\/h2>\n\n\n\n<p>Definitive dry run times would require specific testing of\nthe pump size and conditions of service in question. For small pumps under 2\nhorsepower (hp), testing has shown that the dry run time is minutes and can be\nstretched to more than an hour for the smallest pumps with the DLC coated\nbearings. The greater the power input to the pump, the shorter the time period\nbefore damage occurs in the bearing system. For larger pumps in the 50-plus-hp\nrange, while DLC coatings will still help, the time before damage occurs\nremains quite short. Energizing the motor to check rotation of a pump without DLC\ncoated bearings or liquid in the unit will likely result in some bearing\ndamage. Damage from dry running will initially appear as cracked or chipped SiC\ncomponents. As the liquid vanishes and the rotating ceramic components come in\ncontact with stationary components, the SiC can shatter, breaking into small\npieces. Continued operation damages more pump components such as the shaft,\nrear casing, casing cover and impeller\u2014all of which are costly parts. This type\nof damage to the pump is preventable.<\/p>\n\n\n\n<h4>What About Other Bearing Types and Seals?<\/h4>\n\n\n\n<p>Lined, mag drive pumps use either SiC or nonmetallic bearing\nmaterials. Some of the latter may have enhanced lubricity but are still subject\nto the same axioms of running with compromised lubrication.<\/p>\n\n\n\n<p>Canned motor pumps, the other sealless centrifugal type,\ntypically use softer bearing materials including carbon that are more\nlubricious, but susceptible to wear. These require a bearing monitor system to\navoid component damage.<\/p>\n\n\n\n<p>With mechanically sealed pumps, seal faces operate on a\nsimilar hydrodynamic film and require the same type of lubrication. They will\nnot run dry long without damage either.<\/p>\n\n\n\n<h2>How to Prevent Dry Running <\/h2>\n\n\n\n<p>Again, it is recommended that the pump be protected by a\npower monitor and that the low power trip point be set at a level representing\nthe first indication that suction has been lost. Setting the low trip point\ntime delay at less than 2 to 3 seconds can prevent tripping of the pump when a\nlarge bubble of vapor\/air vents through the pump without losing suction. Trying\nto run longer to empty the suction line of product will result in damage to the\npump that is more costly than the small amount of product that may remain in\nthe suction line. A properly set power monitor will save money for the pump\nowner in several enterprise accounts.<\/p>\n\n\n\n<h2>Conclusion<\/h2>\n\n\n\n<p>Most damage to mag drive pumps can be avoided. So in\nrevisiting our original title question, \u201cHow long can I run my pump dry?\u201d we\nshould instead ask, \u201cCan I or Should I run my pump dry?\u201d Our qualified, \u201cyes,\u201d\nmeans that while you CAN run your pump dry, it should be avoided.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In a previous article, we explored why, ideally, a pump should not endure dry running. Let\u2019s now examine if a pump CAN survive dry running under system upset conditions. SiC bearing material does not tolerate mechanical shock, which is what occurs when there is insufficient lubricating liquid between the bearing component surfaces, leading to contact [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.14 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How Long Can I Dry Run My Pump and Will it Survive? | Enhancing SiC Bearings - Magnatex Pumps Blog | Centrifugal Pumps | Mag Drive Pumps<\/title>\n<meta name=\"description\" content=\"Dry Running your pump can be catastrophic. 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