{"id":15240,"date":"2020-11-05T20:39:34","date_gmt":"2020-11-05T17:09:34","guid":{"rendered":"https:\/\/vacuumpumps.ir\/?p=15240"},"modified":"2025-05-16T20:20:50","modified_gmt":"2025-05-16T15:50:50","slug":"succeed-at-vacuum-system-troubleshooting","status":"publish","type":"post","link":"https:\/\/asiavacuumpumps.com\/asia\/succeed-at-vacuum-system-troubleshooting\/","title":{"rendered":"Succeed at Vacuum System Troubleshooting"},"content":{"rendered":"<header id=\"main-article-header\" class=\"article-page-header\">\n<hgroup>\n<h1 id=\"main-article-title\">Succeed at Vacuum System Troubleshooting<\/h1>\n<h2 class=\"deck\">Understand the causes of common problems and how to address them.<\/h2>\n<\/hgroup>\n<p class=\"author\">By Keith Webb, Tuthill Vacuum &amp; Blower Systems<\/p>\n<p><a href=\"https:\/\/asiavacuumpumps.com\/asia\/what-are-vacuum-thin-films\/\">WHAT ARE VACUUM THIN FILMS?<\/a><br \/>\n<a href=\"https:\/\/asiavacuumpumps.com\/asia\/what-is-vacuum-mass-spectrometry\/\">WHAT IS VACUUM MASS SPECTROMETRY?<\/a><br \/>\n<a href=\"https:\/\/asiavacuumpumps.com\/asia\/innovative-vacuum-and-leak-detection-solutions\/\">Innovative Vacuum and Leak Detection Solutions<\/a><br \/>\n<a href=\"https:\/\/asiavacuumpumps.com\/asia\/dry-oil-less-vacuum-pumps-rotary-claw-piston-screw-vane\/\">Dry (Oil-less) Vacuum Pumps Rotary Claw \u2013 Piston \u2013 Screw \u2013 Vane<\/a><br \/>\n<a href=\"https:\/\/asiavacuumpumps.com\/asia\/accelerate-research-by-tuning-up-vacuum-driven-applications\/\">Accelerate Research by Tuning Up Vacuum-Driven Applications<\/a><br \/>\n<a href=\"https:\/\/asiavacuumpumps.com\/asia\/vacuum-pump-technology\/\">Vacuum Pump Technology<\/a><br \/>\n<a href=\"https:\/\/asiavacuumpumps.com\/asia\/proper-maintenance-of-oilseal-high-vacuum-pumps\/\">Proper Maintenance of OilSeal High Vacuum Pumps<\/a><br \/>\n<a href=\"https:\/\/asiavacuumpumps.com\/asia\/6-questions-you-should-ask-when-buying-a-vacuum-pump\/\">\u06f6 Questions You Should Ask When Buying a Vacuum Pump<\/a><br \/>\n<a href=\"https:\/\/asiavacuumpumps.com\/asia\/evolution-of-the-laboratory-vacuum-pump\/\">Evolution Of The Laboratory Vacuum Pump<\/a><br \/>\n<a href=\"https:\/\/asiavacuumpumps.com\/asia\/succeed-at-vacuum-system-troubleshooting\/\">Succeed at Vacuum System Troubleshooting<\/a><br \/>\n<a href=\"https:\/\/asiavacuumpumps.com\/asia\/13-common-factors-that-affect-pump-life\/\">\u06f1\u06f3 Common Factors that Affect Pump Life<\/a><\/p>\n<\/header>\n<div id=\"Content\">\n<p>When the desired vacuum condition isn\u2019t provided at a process plant, production often comes to a halt and all eyes become focused on the vacuum pump as the root cause of the problem. However, the vacuum pump usually isn\u2019t culprit. In almost all cases, either: 1) the pump is being operated in a condition for which it never was intended, 2) one or more of the user\u2019s interface points with the pump (suction\/discharge lines, water supply, process contaminant, etc.) are being operated outside of design parameters, or 3) the vacuum chamber or vacuum lines were improperly specified. Each vacuum pumping technology will react differently to various conditions, so it\u2019s not possible to offer a \u201cone size fits all\u201d answer to the problem. The following is a guide to systematically identifying the root cause of the most common problems and correcting them based on general vacuum system recommendations as well as technology-specific issues.<\/p>\n<p>Let\u2019s start by noting that vacuum technologies found at plants generally fall into two categories: wet and dry. The terms \u201cwet\u201d and \u201cdry\u201d refer to whether or not the user\u2019s process gas comes into contact with a liquid as the gas passes through the vacuum pump. Wet technologies utilize a liquid to create a seal between the discharge and the suction of the pump to minimize the \u201cslip\u201d of gas backwards from the discharge to the suction and increase volumetric pumping efficiency. Dry technologies have no liquid contact with the process gas. Table 1 lists common vacuum equipment of both types.<\/p>\n<aside class=\"embedded-content article-sidebar\">\n<div class=\"article-sidebar-inner highlight\">\n<h1 class=\"article-sidebar-heading\">Vacuum Producing Equipment<\/h1>\n<p>Table 1. Common options rely on either wet or dry technologies.<\/p>\n<\/div>\n<\/aside>\n<p>&nbsp;<\/p>\n<h3>General Recommendations<\/h3>\n<p>The following points apply to all vacuum systems regardless of pump type:<\/p>\n<div id=\"ad-680x120-in\" class=\"ad ad-680x120 inner-ad-in\">\n<div id=\"cp_680x120_in\"><\/div>\n<\/div>\n<p><em>Vacuum leaks.<\/em>\u00a0All vacuum systems have some amount of air-in leakage, which may or may not be known at the time the vacuum pump is sized. Excessive system leaks result in reduced process gas pumping capacity because the pump must move not only the process gas from the vacuum chamber but also the air-in leakage. Leaks occur at the joints of the vacuum lines and at the vacuum chamber. To avoid excessive air-in leakage, bear in mind the general recommendations of operating pressure ranges for various piping materials and joining methods detailed in Table 2. Note that actual limits will depend upon the skill level of assembly personnel.<\/p>\n<p><em>Vacuum pump or system problem?<\/em>\u00a0You must determine if the issue is caused by the pump or by other equipment in the vacuum system. To find out, mount an isolation valve and an accurate vacuum gauge in-line as near to the suction connection of the vacuum pump as possible. Close the isolation valve and then measure the ultimate vacuum (also called blank-off) performance of the pump. Compare the measured vacuum to the manufacturer\u2019s published ultimate vacuum value. A value reasonably close to the published one indicates the issue stems from leaks or outgassing in the vacuum system.<\/p>\n<p>&nbsp;<\/p>\n<aside class=\"embedded-content article-sidebar\">\n<div class=\"article-sidebar-inner highlight\">\n<figure class=\"SidebarImage-wrapper \"><\/figure>\n<h1 class=\"article-sidebar-heading\">Operating Pressure Ranges<\/h1>\n<p>Table 2. The level of vacuum necessary determines the construction options.<\/p>\n<\/div>\n<\/aside>\n<p>&nbsp;<\/p>\n<p><em>Excessive pump discharge or backpressure.<\/em>\u00a0A vacuum pump is designed to discharge to atmospheric pressure or just slightly above unless the manufacturer specifically designates it a compressor. As the discharge pressure of the pump increases above atmospheric pressure, this raises the differential pressure across the pump, resulting in:<br \/>\n\u2022 higher pump temperature and possible overheating, leading to pump seizure; and<br \/>\n\u2022 increased current draw and subsequent overheating of the electric motor or an overload\/fuse\/breaker fault.<\/p>\n<div class=\"ad-box\">\n<div class=\"ad-row\">\n<div class=\"ad-column\">\n<div id=\"ad-336x280-lr1\" class=\"ad ad-336x280 inner-ad-lr1\">\n<div id=\"cp_336x280_lr1\" data-google-query-id=\"CJWHlsDu6-wCFYWx1QodieQEhg\">\n<div id=\"google_ads_iframe_\/21820155605\/cp_336x280_lr1_0__container__\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"ad-column\">\n<div id=\"ad-336x280-lr2\" class=\"ad ad-336x280 inner-ad-lr2\">\n<div id=\"cp_336x280_lr2\" data-google-query-id=\"CJaHlsDu6-wCFYWx1QodieQEhg\">\n<div id=\"google_ads_iframe_\/21820155605\/cp_336x280_lr2_0__container__\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"ad-column\">\n<div id=\"ad-336x280-lr3\" class=\"ad ad-336x280 inner-ad-lr3\">\n<div id=\"cp_336x280_lr3\" data-google-query-id=\"CJeHlsDu6-wCFYWx1QodieQEhg\">\n<div id=\"google_ads_iframe_\/21820155605\/cp_336x280_lr3_0__container__\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><em>Improperly sized suction and discharge lines.<\/em>\u00a0Sizing of system piping significantly affects pump performance and should be performed by qualified vacuum engineers. However, to avoid problems, apply the following guidelines:<br \/>\n\u2022 Suction and discharge lines never should be smaller than the suction or discharge connection size on the vacuum pump.<br \/>\n\u2022 For every 50 ft of suction or discharge piping, increase the pipe size by one nominal pipe diameter. Example: A vacuum pump has a 2-in. inlet connection. The suction line between the pump and the vacuum chamber is to be 70 ft long. To avoid restrictions to gas flow and pumping performance issues, increase the vacuum line to 3 in.<\/p>\n<p><em>Isolation of pumps operated in parallel.<\/em>\u00a0Many vacuum pump installations consist of multiple pumps operating in parallel and utilizing a common suction and discharge header. For these type of installations, isolate idle pumps from those in operation at the suction and discharge. Failure to isolate the offline pumps may result in: 1) discharge gas from the operating pumps entering an idle pump and contaminating it, and 2) creation of vacuum in the idle pump and a resulting liquid back-stream into the vacuum lines and chamber.<br \/>\nNow, let\u2019s look at specific issues that might affect particular equipment.<\/p>\n<h3>Liquid Ring Pumps<\/h3>\n<p>Several possible operating conditions can cause insufficient vacuum in liquid ring (LR) pumps. The most common are:<br \/>\n\u2022 too high sealant vapor pressure;<br \/>\n\u2022 incorrect sealant flow rate; and<br \/>\n\u2022 process contamination of the sealant (in full sealant recovery systems).<\/p>\n<div class=\"ad-box\">\n<div id=\"ad-970x250-bb1\" class=\"ad ad-970x250 inner-ad-bb1\">\n<div id=\"cp_970x250_bb1\" data-google-query-id=\"CJyHlsDu6-wCFYWx1QodieQEhg\">\n<div id=\"google_ads_iframe_\/21820155605\/cp_bb1_0__container__\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><em>Too high sealant vapor pressure.<\/em>\u00a0A LR pump utilizes a sealant. Most commonly this is water but other liquids may be used based on the specific application of the pump. Generally, the lower the temperature of the sealant, the lower its vapor pressure, which results in increased pumping capacity and deep vacuum performance. In addition, as the process vacuum level approaches the sealant\u2019s vapor pressure, the sealant will begin to flash from the liquid to the vapor phase (cavitation), subsequently displacing the pump\u2019s capacity. Utilize sealant temperature\/capacity correction factors from the specified LR pump manufacturer to properly size the pump.<\/p>\n<p>As a rule of thumb, to avoid pump cavitation select a sealant whose vapor pressure, P<sub>v<\/sub>, at operating temperature is less than half of the required vacuum level, P<sub>1<\/sub>, as measured at the pump inlet. For instance, the P<sub>v<\/sub>\u00a0of water at 60\u00b0F (15\u00b0C) is 13.3 mm Hg absolute. Therefore, the lowest vacuum operating pressure for the pump would be:<\/p>\n<p>P<sub>1<\/sub>\u00a0= (\u06f2)(\u06f1\u06f3\u066b\u06f3) = \u06f2\u06f6\u066b\u06f6 mm Hg<\/p>\n<p>Operating the vacuum pump\u2019s suction pressure below this level will result in cavitation of the water within the pump that ultimately can damage the pump\u2019s impeller (Figure 1).<\/p>\n<p>&nbsp;<\/p>\n<aside class=\"embedded-content article-sidebar Right\">\n<div class=\"article-sidebar-inner highlight\">\n<figure class=\"SidebarImage-wrapper \"><\/figure>\n<h1 class=\"article-sidebar-heading\">Impeller Damage<\/h1>\n<p>Figure 1. Operating at a suction pressure below the lowest recommended pressure can cause cavitation that damages the impeller.<\/p>\n<\/div>\n<\/aside>\n<p>&nbsp;<\/p>\n<p>Water at too high a temperature supplied to the pump directly as sealant or indirectly as coolant to the heat exchanger of a full sealant recovery system will increase the sealant\u2019s vapor pressure. As the vapor pressure increases, this value may approach the vacuum level of the pump and cause the sealant to flash and reduce the pumping capacity. In many cases, the use of cooling tower water in high ambient temperature climates (&gt;95\u00b0F or 35\u00b0C) results in significant capacity reduction. Figure 2 illustrates the capacity reduction when operating a pump at 75 torr should water sealant become much hotter than the desired 60\u00b0F.<\/p>\n<p><em>Incorrect sealant flow rate.<\/em>\u00a0Each model of a particular manufacturer\u2019s LR pump has a specific sealant flow rate requirement to achieve the published vacuum performance. Regulate the sealant flow to within approximately \u00b1\u06f5% of the published requirement. Simple and inexpensive flow control devices are available to regulate this flow.<\/p>\n<p>If too much sealant is fed to the vacuum pump, the volume of the liquid ring within the pump will increase. This will reduce the volume of the rotor available for the pump to move process gas and the pump will lose pumping capacity, resulting in a loss of vacuum.<\/p>\n<p>If too little sealant is fed to the vacuum pump, the liquid ring volume will decrease. The liquid ring no longer will be able to create the necessary seal between the rotor and the housing, allowing internal \u201cslip\u201d of the discharge gas back to suction and resulting in reduced pumping capacity and loss of vacuum.<\/p>\n<p>&nbsp;<\/p>\n<aside class=\"embedded-content article-sidebar\">\n<div class=\"article-sidebar-inner highlight\">\n<figure class=\"SidebarImage-wrapper \"><\/figure>\n<h1 class=\"article-sidebar-heading\">Capacity Reduction<\/h1>\n<p>Figure 2. Pump operating at 75 torr suffers significant capacity reduction when sealant water is markedly hotter than the desired 60\u00b0F.<\/p>\n<\/div>\n<\/aside>\n<p>&nbsp;<\/p>\n<p><em>Process contamination of the sealant (in full sealant recovery systems).<\/em>\u00a0Such contamination can involve carryover of condensate or particulates.<\/p>\n<p>During the process of moving gases from the vacuum chamber through the LR pump, the process gas will contact the sealant and subsequently may collect in the sealant. If the substance collects in the sealant liquid and has a vapor pressure higher than that of the sealant, it will enter the LR pump and flash from the liquid to the vapor phase, reducing the pump\u2019s capacity. As an example, when using oil as the LR sealant, if water vapor is a carryover product from the process gas, the vapor will condense to liquid in the discharge separator tank and effectively increase the pump sealant vapor pressure and decrease capacity.<\/p>\n<p>Carryover of particulates or other solids may clog sealant piping, strainers, heat exchangers, valves, etc., and restrict sealant flow to the vacuum pump, resulting in reduced pumping capacity and possible overheating of the LR pump.<\/p>\n<h3>Oil-Sealed Rotary Pumps<\/h3>\n<p>Some of the most common field issues experienced by oil-sealed rotary piston pumps and rotary vane pumps are:<\/p>\n<p>\u2022 belt squeal\/high amp draw at startup;<br \/>\n\u2022 inability of pump to blank-off\/milky oil;<br \/>\n\u2022 back-streaming of oil into suction lines or vacuum chamber; and<br \/>\n\u2022 excessive oil mist discharge.<\/p>\n<p><em>Belt squeal\/high amp draw at startup.<\/em>\u00a0Belt squeal of a pump at startup can stem from: 1) improper belt tensioning, 2) cold oil temperature due to low ambient temperature, or 3) improper shutdown procedure.<\/p>\n<p>Typically, a loose belt causes belt squeal. Check for looseness by starting the pump and observing the deflection of the belt during rotation. Do not apply belt dressing to V-belts such as those used on Tuthill vacuum pumps. If the belt appears to have excessive deflection, refer to the manufacturer\u2019s product manual for proper tensioning instructions.<\/p>\n<p>The next likely cause of belt squeal\/high amps is attempting to start the pump in low ambient temperature conditions, typically &lt;60\u00b0F (15\u00b0C). In this case, you must install oil preheaters to increase the oil\u2019s temperature and reduce its viscosity so the internal components don\u2019t create high torque on the shaft. It often makes sense to use a temperature switch to ensure the pump will not start until the heaters have raised the oil temperature enough.<\/p>\n<p>Lastly, oil-sealed rotary piston pumps are particularly prone to improper shutdown. A pump shut down under vacuum will leave an excessive amount of oil in the cylinder. Then, when an operator attempts to start the pump, the cold viscous oil will create high torque on the pump shaft, resulting in high amp draw. Oil-sealed pumps require that the inlet pressure of the pump be increased sufficiently (typically &gt;100 torr for no less than 15 sec.) to allow more gas flow through the cylinder of the pump, resulting in displacement of the oil in the cylinder back into the main oil reservoir.<\/p>\n<p>&nbsp;<\/p>\n<aside class=\"embedded-content article-sidebar Left\">\n<div class=\"article-sidebar-inner highlight\">\n<figure class=\"SidebarImage-wrapper \"><\/figure>\n<h1 class=\"article-sidebar-heading\">Process Buildup<\/h1>\n<p>Figure 3. Accumulation of baked-on material can eliminate essential clearances and lead to pump failure.<\/p>\n<\/div>\n<\/aside>\n<p>&nbsp;<\/p>\n<p><em>Inability of pump to blank-off\/\u201cmilky\u201doil.<\/em>\u00a0Oil-sealed vacuum pumps commonly fail to meet the published blank-off performance due to: 1) substitution of the manufacturer\u2019s vacuum pump oil with an improper oil, or 2) condensable process vapors collecting in the oil.<\/p>\n<p>Vacuum pump operators for various reasons may not use the manufacturer\u2019s recommended oil. This often can result in failure to produce the deep vacuum results as published. Vacuum pump oils are formulated to have a vapor pressure significantly lower than the pump\u2019s ultimate vacuum capability. If a higher vapor pressure oil is substituted, the pump will begin to create vacuum and reach the vapor pressure of the oil in the cylinder. When this occurs, the oil will flash to the vapor phase, displace the pump\u2019s capacity and result in higher blank-off values. The only remedy is to use an oil that has a vapor pressure equal to or less than that of the manufacturer\u2019s vacuum pump oil. Matching the recommended oil\u2019s viscosity also is necessary.<\/p>\n<p>Many processes such as vacuum drying contain moisture that will condense when it reaches the pump\u2019s oil reservoir at atmospheric pressure. The visual result is \u201cmilky\u201d oil. Typically, the liquid has a vapor pressure significantly higher than the pump\u2019s ultimate pressure. As the condensed liquid is recirculated with the oil into the cylinder (under vacuum), it begins to flash to a vapor phase. This again results in a higher-than-published blank-off value. The solution is either to: 1) run the pump\u2019s gas ballast valve open (off process) for 15\u2013\u06f3\u06f0 minutes, allowing the incoming air to strip the moisture from the oil, or 2) change the oil more frequently. Note that failure to perform one of these procedures will result in excessive wear of the internals due to increased friction and heat and, thus, reduced pump life.<\/p>\n<p><em>Back-streaming of oil into suction lines or vacuum chamber.<\/em>\u00a0This commonly stems from failure to vent the pump\u2019s inlet prior to shutdown. As already noted, oil-sealed pumps require that the inlet pressure of the pump be increased sufficiently (typically &gt;100 torr for no less than 15 sec.) to allow more gas flow through the cylinder of the pump, resulting in displacement of the oil in the cylinder back into the main oil reservoir.<\/p>\n<p><em>Excessive oil mist discharge.<\/em>\u00a0This phenomenon typically occurs because: 1) the pump has been operated continuously at an inlet pressure greater than the manufacturer\u2019s recommendation, or 2) the pump\u2019s oil mist element has failed.<\/p>\n<p>Oil-sealed pumps commonly are used to operate continuously at inlet pressures &lt;10 Torr or for short pump-down cycles that don\u2019t allow oil to saturate the pump\u2019s oil coalescing element. If a pump is operated above the manufacturer\u2019s recommended maximum for prolonged periods, the relatively high gas density will carry the oil into the mist element at rates beyond its maximum filtering capability. The result is oil discharge from the exhaust of the pump. The best way to avoid this situation is appropriate sizing of the pump for the system design to avoid high operating inlet pressures for prolonged periods.<\/p>\n<p>The other possibility is that the pump\u2019s oil mist element fibers have separated due to continuous saturation and high pressure differential, resulting in the escape of oil mist from the pump\u2019s exhaust. Replacing the element commonly will solve the problem.<\/p>\n<h3>Dry Screw Pumps<\/h3>\n<p>The two most common issues related to the improper application or operation of dry screw vacuum pumps are:<\/p>\n<p>\u2022 overheating and pump seizure; and<br \/>\n\u2022 high motor amp draw.<\/p>\n<p>Note that while dry screw vacuum pumps all have some common features, the symptoms of each pump will be manufacturer and model specific.<\/p>\n<p><em>Overheating and pump seizure.<\/em>\u00a0Dry screw vacuum pumps are susceptible to several potential causes of overheating. The more common are:<br \/>\nreduced cooling water flow\/high cooling water temperature; high inlet gas temperature; and improper staging with a vacuum booster.<\/p>\n<p>The dry screw pump is more sensitive to cooling water flow and temperature than other technologies. A reduction in cooling water flow rate below the manufacturer\u2019s minimum recommendation or supply cooling water temperatures in excess of the manufacturer\u2019s recommendation can result in thermal growth and, ultimately, seizure of the pump.<\/p>\n<p>Because dry screw pumps have no internal liquids to absorb heat, their internal temperatures can range from 250\u00b0F to 450\u00b0F depending upon the screw design. So, they are sensitive to inlet gas temperatures; each pump has a manufacturer\u2019s maximum inlet gas temperature rating. Unfortunately, this value sometimes isn\u2019t considered during the selection process and, as a result, the pump might encounter entering gas temperatures that exceed this value, resulting in excessively high internal gas temperatures that cause thermal growth and subsequent pump seizure.<\/p>\n<p>The sizing process of a pump with a vacuum booster requires consideration of several parameters. One of the most important when pairing a vacuum booster upstream of a dry screw pump is staging ratio. This is defined as the ratio of the volumetric flow rate of the vacuum booster, V<sub>1<\/sub>, to the volumetric flow rate, V<sub>2<\/sub>: SR = V<sub>1<\/sub>\/V<sub>2<\/sub>. Applying Boyle\u2019s Law: V<sub>1<\/sub>\/V<sub>2<\/sub>\u00a0= P<sub>2<\/sub>\/P<sub>1<\/sub>.<\/p>\n<p>Because V<sub>1<\/sub>\u00a0always is greater than V<sub>2<\/sub>, the pressure between the booster and the dry screw pump, P<sub>2<\/sub>, always will be greater than the inlet pressure, P<sub>1<\/sub>, to the system. The gas compression across the booster results in a temperature rise of the gas that will enter the dry screw pump. Therefore, carefully consider this ratio to avoid exceeding the inlet gas temperature rating of the dry screw pump.<\/p>\n<p><em>High motor amp draw.<\/em>\u00a0Many types of rotating machinery experience high motor amp draw. Usually the cause isn\u2019t an issue with the motor but rather with the piece of equipment it is driving. In the case of dry screw pumps, high amp draw typically results from: excessive discharge pressure (as noted in the general section); process buildup in the machine; or internal contact due to the cooling water and inlet gas temperature noted above.<\/p>\n<p>Excessive discharge pressure as well as cooling water and inlet gas temperature already have been addressed, so, let\u2019s focus on process buildup in the machine. Many vacuum processes contain chemicals that combine at high temperatures to form sticky or tacky materials that attach and then \u201cbake onto\u201d the screws (Figure 3). Their buildup ultimately creates a \u201czero clearance\u201d condition inside the pump. This contact within the pump leads to additional torque on the pump shaft, resulting in increased amp draw.<\/p>\n<p>Consult the pump\u2019s manufacturer for a recommended solution. Generally this will involve either: 1) knocking out or filtering the process gases upstream, or 2) supplying a cleaning flush. Option 1 is preferable in extending pump life. However, filtration units can be costly and will require continual maintenance. In addition, as the filter elements clog, a resulting loss of vacuum in the process chamber will occur.<\/p>\n<p>The cleaning flush option avoids the cost of the filtration system but may pose its own operational issues that could result in damage to the pump. Moreover, there\u2019s no guarantee of success with the flushing process. Proper choice of flushing medium is most important and requires determining whether a solvent is needed to dissolve material or if a mechanical cleaning fluid such as water will suffice; the pump manufacturer should approve the selection. When injecting a direct liquid flush into a dry screw pump, take care not to flood the pump\u2019s screw chamber as this can result in the pump attempting to compress liquid and subsequent mechanical failure requiring a major rebuild of the machine. Lastly, when injecting a flushing liquid into the pump\u2019s process chamber, elevate the pump\u2019s inlet pressure sufficiently above the vapor pressure of the liquid to avoid flashing. Such flashing to vapor will compromise cleaning as well as potentially create freezing problems within the machine due to the Joule-Thompson effect.<\/p>\n<h3>Achieve Long-Term Success<\/h3>\n<p>The process of creating a successful vacuum installation consists of several steps:<\/p>\n<p>\u2022 Determine the parameters of the entire cycle of the vacuum operation from startup to shutdown.<br \/>\n\u2022 Select the appropriate vacuum technology and material of construction to match the process vacuum and flow requirement and gases to be handled.<br \/>\n\u2022 Properly size the vacuum pumping equipment, vacuum chamber and suction and discharge lines.<br \/>\n\u2022 Commission and leak check the vacuum system and validate on the process.<\/p>\n<p>The vacuum pumping technologies addressed in this article are time-proven and will give years of reliable service when appropriately applied and operated. However, when troubleshooting is required, the pointers provided here should help you properly diagnose and address issues.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Succeed at Vacuum System Troubleshooting Understand the causes of common problems and how to address them. By Keith Webb, Tuthill Vacuum &amp; Blower Systems WHAT ARE VACUUM THIN FILMS? WHAT IS VACUUM MASS SPECTROMETRY? Innovative Vacuum and Leak Detection Solutions Dry (Oil-less) Vacuum Pumps Rotary Claw \u2013 Piston \u2013 Screw \u2013 Vane Accelerate Research by [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-15240","post","type-post","status-publish","format-standard","hentry","category-2","wpbf-post"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\r\n<title>Succeed at Vacuum System Troubleshooting - \u067e\u0645\u067e \u0648\u06a9\u06cc\u0648\u0645 \u0622\u0628\u06cc<\/title>\r\n<meta name=\"description\" content=\"Succeed at Vacuum System Troubleshooting - Understand the causes of common problems and how to address them. 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