{"id":129,"date":"2024-08-02T08:06:49","date_gmt":"2024-08-02T08:06:49","guid":{"rendered":"https:\/\/knowledge-center.novatec.com\/?page_id=129"},"modified":"2026-03-27T18:58:16","modified_gmt":"2026-03-27T18:58:16","slug":"pump-performance-characteristics","status":"publish","type":"page","link":"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/vacuum-pumps\/pump-performance-characteristics\/","title":{"rendered":"Pump Performance Characteristics"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"129\" class=\"elementor elementor-129\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5d7ee970 e-con-full e-flex e-con e-parent\" data-id=\"5d7ee970\" data-element_type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-2ff9c1a7 e-con-full e-flex e-con e-child\" data-id=\"2ff9c1a7\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element 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href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/system-design\/design-considerations\/\" class = \"hfe-sub-menu-item\">Design Considerations<\/a><\/li>\n\t<li id=\"menu-item-1773\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/system-design\/vacuum-pump-comparison-chart\/\" class = \"hfe-sub-menu-item\">Vacuum Pump Comparison Chart<\/a><\/li>\n\t<li id=\"menu-item-1774\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/system-design\/special-applications\/\" class = \"hfe-sub-menu-item\">Special Applications<\/a><\/li>\n\t<li id=\"menu-item-1775\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/system-design\/choosing-line-size-location\/\" class = \"hfe-sub-menu-item\">Choosing Line Size Location<\/a><\/li>\n\t<li id=\"menu-item-1776\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/system-design\/to-purge-or-not-to-purge\/\" class = \"hfe-sub-menu-item\">To Purge or Not to Purge<\/a><\/li>\n\t<li id=\"menu-item-1777\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/system-design\/the-purpose-of-blowback\/\" class = \"hfe-sub-menu-item\">The Purpose of Blowback<\/a><\/li>\n\t<li id=\"menu-item-1778\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a 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tabindex=\"0\" role=\"button\" aria-haspopup=\"true\" aria-expanded=\"false\"><a aria-expanded=\"false\" href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/components\/\" class = \"hfe-menu-item\">Components<span class='hfe-menu-toggle sub-arrow hfe-menu-child-0'><i class='fa'><\/i><\/span><\/a><\/div>\n<ul class=\"sub-menu\">\n\t<li id=\"menu-item-1715\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/components\/tubing-bends-couplers-and-flexible-hose\/\" class = \"hfe-sub-menu-item\">Tubing Bends Couplers and Flexible Hose<\/a><\/li>\n\t<li id=\"menu-item-1716\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children hfe-has-submenu hfe-creative-menu\"><div class=\"hfe-has-submenu-container\" tabindex=\"0\" role=\"button\" aria-haspopup=\"true\" aria-expanded=\"false\"><a aria-expanded=\"false\" href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/vacuum-pumps\/\" class = \"hfe-sub-menu-item\">Vacuum Pumps<span class='hfe-menu-toggle sub-arrow hfe-menu-child-1'><i class='fa'><\/i><\/span><\/a><\/div>\n\t<ul class=\"sub-menu\">\n\t\t<li id=\"menu-item-3770\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/vacuum-pumps\/the-ultimate-guide-to-vacuum-pumps-for-plastics-processing-how-to-choose-the-right-one-for-your-plant\/\" class = \"hfe-sub-menu-item\">The Ultimate Guide to Vacuum Pumps for Plastics Processing: How to Choose the Right One for Your Plant<\/a><\/li>\n\t\t<li id=\"menu-item-4168\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/vacuum-pumps\/is-your-vacuum-pump-a-legal-liability\/\" class = \"hfe-sub-menu-item\">Is Your Vacuum Pump a Legal Liability?<\/a><\/li>\n\t\t<li id=\"menu-item-1717\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/vacuum-pumps\/pump-types\/\" class = \"hfe-sub-menu-item\">Pump Types<\/a><\/li>\n\t\t<li id=\"menu-item-1718\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/vacuum-pumps\/pump-performance-characteristics\/\" class = \"hfe-sub-menu-item\">Pump characteristics<\/a><\/li>\n\t\t<li id=\"menu-item-1719\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/vacuum-pumps\/startup-troubleshooting\/\" class = \"hfe-sub-menu-item\">Startup Troubleshooting<\/a><\/li>\n\t<\/ul>\n<\/li>\n\t<li id=\"menu-item-1720\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children hfe-has-submenu hfe-creative-menu\"><div class=\"hfe-has-submenu-container\" tabindex=\"0\" role=\"button\" aria-haspopup=\"true\" aria-expanded=\"false\"><a aria-expanded=\"false\" href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/material-selection-methods\/\" class = \"hfe-sub-menu-item\">Material Selection Methods<span class='hfe-menu-toggle sub-arrow hfe-menu-child-1'><i class='fa'><\/i><\/span><\/a><\/div>\n\t<ul class=\"sub-menu\">\n\t\t<li id=\"menu-item-1721\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/material-selection-methods\/open-array-fantail-manifolds\/\" class = \"hfe-sub-menu-item\">Open Array Fantail Manifolds<\/a><\/li>\n\t\t<li id=\"menu-item-1722\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a 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\"hfe-sub-menu-item\">Vacuum Loaders<span class='hfe-menu-toggle sub-arrow hfe-menu-child-1'><i class='fa'><\/i><\/span><\/a><\/div>\n\t<ul class=\"sub-menu\">\n\t\t<li id=\"menu-item-3847\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/vacuum-loaders\/the-ultimate-guide-to-self-contained-loaders-for-plastics-processing\/\" class = \"hfe-sub-menu-item\">The Ultimate Guide to Self-Contained Loaders for Plastics Processing<\/a><\/li>\n\t\t<li id=\"menu-item-1725\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/vacuum-loaders\/compressed-air-loaders\/\" class = \"hfe-sub-menu-item\">Compressed Air Loaders<\/a><\/li>\n\t\t<li id=\"menu-item-1726\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/vacuum-loaders\/modern-loader-design\/\" class = \"hfe-sub-menu-item\">Modern Loader Design<\/a><\/li>\n\t\t<li id=\"menu-item-1727\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/vacuum-loaders\/powder-loaders\/\" class = \"hfe-sub-menu-item\">Powder Loaders<\/a><\/li>\n\t\t<li id=\"menu-item-1728\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/vacuum-loaders\/pellet-regrind-loaders\/\" class = \"hfe-sub-menu-item\">Pellet Regrind Loaders<\/a><\/li>\n\t<\/ul>\n<\/li>\n\t<li id=\"menu-item-1729\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children hfe-has-submenu hfe-creative-menu\"><div class=\"hfe-has-submenu-container\" tabindex=\"0\" role=\"button\" 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hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/gaylord-unloading\/lances\/\" class = \"hfe-sub-menu-item\">Lances<\/a><\/li>\n\t<\/ul>\n<\/li>\n\t<li id=\"menu-item-1705\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children hfe-has-submenu hfe-creative-menu\"><div class=\"hfe-has-submenu-container\" tabindex=\"0\" role=\"button\" aria-haspopup=\"true\" aria-expanded=\"false\"><a aria-expanded=\"false\" href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/components\/vacuum-receivers\/\" class = \"hfe-sub-menu-item\">Vacuum Receivers<span class='hfe-menu-toggle sub-arrow hfe-menu-child-1'><i class='fa'><\/i><\/span><\/a><\/div>\n\t<ul class=\"sub-menu\">\n\t\t<li id=\"menu-item-4041\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/components\/vacuum-receivers\/the-ultimate-guide-to-vacuum-receivers-for-plastics-processing\/\" class = \"hfe-sub-menu-item\">The Ultimate Guide to Vacuum Receivers for Plastics Processing<\/a><\/li>\n\t\t<li id=\"menu-item-1713\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/components\/vacuum-receivers\/features-to-consider\/\" class = \"hfe-sub-menu-item\">Features To Consider<\/a><\/li>\n\t\t<li id=\"menu-item-1714\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/components\/vacuum-receivers\/trouble-shooting-vacuum-receivers\/\" class = \"hfe-sub-menu-item\">Trouble shooting<\/a><\/li>\n\t<\/ul>\n<\/li>\n\t<li id=\"menu-item-1733\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/blenders-and-feeders\/\" class = \"hfe-sub-menu-item\">Blenders and Feeders<\/a><\/li>\n\t<li id=\"menu-item-1734\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children hfe-has-submenu hfe-creative-menu\"><div class=\"hfe-has-submenu-container\" tabindex=\"0\" role=\"button\" aria-haspopup=\"true\" aria-expanded=\"false\"><a aria-expanded=\"false\" href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/bulk-resin-storage-and-handling\/\" class = \"hfe-sub-menu-item\">Bulk Resin Storage and Handling<span class='hfe-menu-toggle sub-arrow hfe-menu-child-1'><i class='fa'><\/i><\/span><\/a><\/div>\n\t<ul class=\"sub-menu\">\n\t\t<li id=\"menu-item-1735\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a 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href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/supplemental-system-components\/cyclone-dust-collectors\/\" class = \"hfe-sub-menu-item\">Cyclone Dust Collectors<\/a><\/li>\n\t\t<li id=\"menu-item-1741\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/supplemental-system-components\/take-off-box-probes\/\" class = \"hfe-sub-menu-item\">Take off box probes<\/a><\/li>\n\t\t<li id=\"menu-item-1742\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/supplemental-system-components\/proportioning-purge-valves\/\" class = \"hfe-sub-menu-item\">Proportioning Purge Valves<\/a><\/li>\n\t\t<li id=\"menu-item-1743\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/supplemental-system-components\/station-valves\/\" class = \"hfe-sub-menu-item\">Station valves<\/a><\/li>\n\t\t<li id=\"menu-item-1744\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/supplemental-system-components\/drawer-magnets\/\" class = \"hfe-sub-menu-item\">Drawer Magnets<\/a><\/li>\n\t\t<li id=\"menu-item-1745\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/supplemental-system-components\/vacuum-take-off-box-purge-valve\/\" class = \"hfe-sub-menu-item\">Vacuum Take Off Box Purge Valve<\/a><\/li>\n\t\t<li id=\"menu-item-1746\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/supplemental-system-components\/vacuum-take-off-boxes\/\" class = \"hfe-sub-menu-item\">Vacuum Take Off Boxes<\/a><\/li>\n\t<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li id=\"menu-item-1783\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children parent hfe-has-submenu hfe-creative-menu\"><div class=\"hfe-has-submenu-container\" tabindex=\"0\" role=\"button\" aria-haspopup=\"true\" aria-expanded=\"false\"><a aria-expanded=\"false\" href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/components\/conveying-controls\/\" class = \"hfe-menu-item\">Conveying Controls<span class='hfe-menu-toggle sub-arrow hfe-menu-child-0'><i class='fa'><\/i><\/span><\/a><\/div>\n<ul class=\"sub-menu\">\n\t<li id=\"menu-item-1784\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/components\/conveying-controls\/matching-a-control-to-your-system\/\" class = \"hfe-sub-menu-item\">Matching A Control To Your System<\/a><\/li>\n\t<li id=\"menu-item-1785\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/components\/conveying-controls\/vacuum-system-controls\/\" class = \"hfe-sub-menu-item\">Vacuum System Controls<\/a><\/li>\n<\/ul>\n<\/li>\n<li id=\"menu-item-1786\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children parent hfe-has-submenu hfe-creative-menu\"><div class=\"hfe-has-submenu-container\" tabindex=\"0\" role=\"button\" aria-haspopup=\"true\" aria-expanded=\"false\"><a aria-expanded=\"false\" href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/conveying-faq\/\" class = \"hfe-menu-item\">FAQ<span class='hfe-menu-toggle sub-arrow hfe-menu-child-0'><i class='fa'><\/i><\/span><\/a><\/div>\n<ul class=\"sub-menu\">\n\t<li id=\"menu-item-1787\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/conveying-faq\/vacuum-system-technology\/\" class = \"hfe-sub-menu-item\">Vacuum System Technology<\/a><\/li>\n\t<li id=\"menu-item-1788\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/conveying-faq\/contamination\/\" class = \"hfe-sub-menu-item\">Contamination<\/a><\/li>\n\t<li id=\"menu-item-1789\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/conveying-faq\/upgrading-systems\/\" class = \"hfe-sub-menu-item\">Upgrading Systems<\/a><\/li>\n\t<li id=\"menu-item-1790\" class=\"menu-item menu-item-type-post_type menu-item-object-page hfe-creative-menu\"><a href=\"https:\/\/www.novatec.com\/knowledge-center\/plastics-conveying\/conveying-faq\/angel-hair-fines-and-dust\/\" class = \"hfe-sub-menu-item\">Angel Hair Fines and Dust<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul> \n\t\t\t\t<\/nav>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-700c8c53 e-con-full e-flex e-con e-child\" data-id=\"700c8c53\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7e5f4a6d elementor-widget elementor-widget-page-title\" data-id=\"7e5f4a6d\" data-element_type=\"widget\" data-widget_type=\"page-title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\n\t\t<div class=\"hfe-page-title hfe-page-title-wrapper elementor-widget-heading\">\n\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.novatec.com\/knowledge-center\">\n\t\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">\n\t\t\t\t\t\t\t\t\n\t\t\t\tPump Performance Characteristics  \n\t\t\t<\/h1 > \n\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5e766c18 e-con-full e-flex e-con e-child\" data-id=\"5e766c18\" data-element_type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-ca2031d e-con-full e-flex e-con e-child\" data-id=\"ca2031d\" data-element_type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-a952afd e-con-full e-flex e-con e-child\" data-id=\"a952afd\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-12f6ee6 elementor-widget elementor-widget-text-editor\" data-id=\"12f6ee6\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"kcHeading\"><strong>Basic Performance Characteristics of Pump Types<\/strong><\/h2><p class=\"kcHeading\"><strong>Maximum vs. Operating Vacuum<\/strong><\/p><p>To get the maximum benefit from your conveying system, it\u2019s important to understand what these terms mean and why they are important.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-88e9f66 e-con-full e-flex e-con e-child\" data-id=\"88e9f66\" data-element_type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-ebbeece e-con-full e-flex e-con e-child\" data-id=\"ebbeece\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-56dae06 elementor-widget elementor-widget-text-editor\" data-id=\"56dae06\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Maximum Vacuum<\/strong>\u00a0(measured in inches of mercury) is the maximum safe pulling capacity of the pump. Vacuum relief devices are often included with a pump to prevent operating above this level, though operating at maximum vacuum on a continuous basis will lead to more frequent maintenance and reduced blower life due to elevated operating temperatures.<\/p><p><strong>Operating Vacuum<\/strong>\u00a0is the highest vacuum level a conveying system should pull during normal operation, and it\u2019s the basis for calculating the system\u2019s maximum conveying rate. Operating a conveying system at the specified operating vacuum, as opposed to the pump\u2019s maximum vacuum, leaves \u201cwiggle room\u201d for unexpected changes, such as a dirty filter or varying material types, and leaves some extra vacuum in reserve to help clear an overfed conveying line of material slugs.<\/p><p><strong>Free Vacuum<\/strong>\u00a0is the vacuum that results from pulling air without material through the connected system tubing. The difference between Free Vacuum and Operating Vacuum represents the approximate vacuum energy available to move material when using PD and Claw type pumps. Regenerative pumps move much more air as vacuum levels decrease, so excessive air speeds create an artificially high Free Vacuum level with these pumps.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0e7b376 e-con-full e-flex e-con e-child\" data-id=\"0e7b376\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5206a41 elementor-widget elementor-widget-image\" data-id=\"5206a41\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"500\" height=\"314\" src=\"https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/pump-performance-chart.jpg\" class=\"attachment-large size-large wp-image-131\" alt=\"\" srcset=\"https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/pump-performance-chart.jpg 500w, https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/pump-performance-chart-300x188.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9528459 elementor-widget elementor-widget-text-editor\" data-id=\"9528459\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"kcpic\"><div class=\"kccaption\">Above you can easily see the range of system line sizes available with each type of pump, as well as the vacuum in inches of mercury (Hg) developed by each pump, and their relative costs.<\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f97da07 e-con-full e-flex e-con e-child\" data-id=\"f97da07\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-80c043d elementor-widget elementor-widget-text-editor\" data-id=\"80c043d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><strong>Basic Rules for Pump Selection:<\/strong><\/h2><p><strong>Rule #1 &#8211; The pump must generate enough vacuum to overcome the resistance of the air and material as it moves through the length of tubing for the installed system.<\/strong><\/p><p>Calculating the resistance of air and material in a conveying tube requires a complex set of equations and variables that are beyond the scope of this format. Key factors include velocity pressure, tube diameter and length, friction constants, and pellet characteristics.<\/p><p>Many equipment suppliers rely on rules of thumb relating \u201cEquivalent Distance\u201d conveyed to expected resin transfer rate. These rules are often derived from testing, so they\u2019re reliable when evaluating applications that fall within the tested range.<\/p><p>\u201cEquivalent Distance\u201d is often confused with actual horizontal distance to be conveyed. Other factors add resistance as well, and must be included with horizontal distance to accurately estimate the resulting resin transfer rate. The typical factors associated with Equivalent Distance include:<\/p><table border=\"0\" width=\"696\"><tbody><tr><td><strong>1\u2019 horizontal =1 equivalent ft.<\/strong><\/td><td><strong>1\u2019 vertical = 2 equivalent ft.<\/strong><\/td><\/tr><tr><td><strong>1\u2019 flex hose = 3 equivalent ft.<\/strong><\/td><td><strong>Each elbow = 20 equivalent ft.<\/strong><\/td><\/tr><tr><td colspan=\"2\"><strong>1\u2019 vacuum line = 0.2 to 0.6 equivalent ft. (depends on diameter and distance)<\/strong><\/td><\/tr><tr><td colspan=\"2\"><strong>(vacuum line = tubing between the resin receiver and the vacuum pump).<\/strong><\/td><\/tr><\/tbody><\/table><p>The key for this step is to understand the vacuum pulling capacity of the available pump technologies, and whether they meet or exceed the system requirements.<\/p><p><strong>Rule #2 \u2013 The pump must create the appropriate air velocity at the material source to sweep resin into the tubing and carry it to the destination receiver.<\/strong><\/p><p>The first consideration is creating the airflow and resulting velocity required to sweep resin into the tubing at the material source. This velocity is often called pickup velocity, or saltation velocity. There are a number of methods used to calculate this value, and they rely on material specific factors that are usually verified through testing. For commonly used plastics, the range is 3000 feet per minute (fpm) at the low end, and 4500 fpm on the extreme high end. Most plastics can be transferred using a pickup velocity between 3000 \u2013 3500 fpm.<\/p><p>The second consideration is the material\u2019s sensitivity to variations in air velocity. Some resins can break down as speed increases, and others can break down your system\u2019s elbows and other impact points through erosive wear as speed increases.<\/p><p>The following chart compares the airflow versus vacuum for both Regen and PD pumps operating at constant speeds. Note that the Regen pump starts out at a higher speed than a PD pump due to its direct drive arrangement. This creates higher starting velocity. Also note the Regen pump airflow, and resulting velocity, increases more dramatically than PD pump airflow as the system vacuum requirements decrease.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b6b1339 elementor-widget elementor-widget-image\" data-id=\"b6b1339\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"500\" height=\"343\" src=\"https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/air-speed-pump.jpg\" class=\"attachment-large size-large wp-image-132\" alt=\"\" srcset=\"https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/air-speed-pump.jpg 500w, https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/air-speed-pump-300x206.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-908b654 elementor-widget elementor-widget-text-editor\" data-id=\"908b654\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"kccaption\">The differences in speed variation has significant results<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b764f12 elementor-widget elementor-widget-text-editor\" data-id=\"b764f12\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Result #1: Regen pumps move materials at higher speeds than PD pumps, which can lead to excessive material degradation or erosive wear on your system components. Examples of material degradation for sensitive materials include angel air, streamers, contaminating buildup or excessive dust, depending on material.<\/strong><\/p><p><strong>Result #2: Since velocity increases resistance to movement in a conveying system, Regen pumps use more of their operating vacuum just to pull air through a vacuum line (as compared to a PD pump), leaving LESS of their operating vacuum to pull material from source to destination. (See Tables 2-3 below)<\/strong><\/p><p>These two results often lead to Regen pump suppliers adding velocity control devices into their systems. It\u2019s important to understand the complete operating picture of a given pump technology before deciding which to use, and what optional features may be needed.<\/p><h2><strong>System Design<\/strong><\/h2><p>You probably would not try to design and build your own automobile and the same is true of vacuum conveying systems. Talk to a professional systems design specialist who represents a company with a full range of options for receivers, pumps, abrasion-resistant components and velocity control.<\/p><p>The system designer will ask a lot of questions about the types of materials you will be conveying, machine capacities and more. He will calculate the equivalent distances, the line sizes required and use pump curves to suggest the type of vacuum pump that best suits your current and expected future needs. It is always best to plan ahead for expansion.<\/p><p>Being able to choose from a full range of pumps is of can be a great benefit to maximizing a conveying system\u2019s performance. The following 2 tables show how Free Vacuum, or the resistance to moving only air (without material) helps to estimate relative pump technology capability for a given installation. Higher Free Vacuum leaves less Available Vacuum to transport material.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2ed80e1 elementor-widget elementor-widget-image\" data-id=\"2ed80e1\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"500\" height=\"236\" src=\"https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/pump-400.jpg\" class=\"attachment-large size-large wp-image-133\" alt=\"\" srcset=\"https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/pump-400.jpg 500w, https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/pump-400-300x142.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9a03f60 elementor-widget elementor-widget-text-editor\" data-id=\"9a03f60\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"kccaption\">You can see in this 400 foot system, the 4\u201dHg Free Vacuum needed for a single stage Regen pump uses most of the Pump\u2019s Operating Vacuum \u2013 leaving only a small amount of Available Vacuum to transport material. Longer distances benefit from the added vacuum and lower velocity available with PD pumps<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-113ac74 e-con-full e-flex e-con e-child\" data-id=\"113ac74\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6752b9d elementor-widget elementor-widget-text-editor\" data-id=\"6752b9d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>As distance increases, Free Vacuum can begin to overpower the pump\u2019s Available Vacuum for moving material. Suppose you want to expand a system to include more machines, which also increases the Equivalent Distance for conveying to 1000 feet. Traditional Regen and PD pumps have limited Available Vacuum energy at this distance, so you\u2019ll be faced with 2 choices:<\/p><ol><li>Increase system capacity with larger diameter conveying tubing. Unfortunately, this requires tearing out your existing pump(s), and all of your existing conveying lines.<\/li><li>Investigate alternative higher vacuum pump technologies to replace the existing pump(s), but can still use the existing installed tubing.<\/li><\/ol><p>Option 1 means you\u2019ll rip-and-replace the existing system, and could incur excessive capital costs and suffer major interruptions to existing production, so the smart thing to consider is alternate pump technologies associated with Option 2.<\/p><p>In the table, we see when the system is lengthened to 1000 feet, the first three types of pumps have little or NO Available Vacuum for transporting material. At the same time, the pumps with higher operating vacuum capacities will be able to transport material. When this is the case, the wise choice is to replace the existing pumps with either a maximum efficiency PD pump, or a Claw pump. In almost all cases, the maximum efficiency PD pump is chosen because of the comparatively high cost of the claw pump technology.<\/p><p>Pump selection is key to your system\u2019s effectiveness and efficiency. To reap the maximum benefits from your investment, work with a supplier who can offer a full range of pump technologies to ensure the proper solution for your conveying needs.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e47e552 elementor-widget elementor-widget-image\" data-id=\"e47e552\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"324\" src=\"https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/pump-1000.jpg\" class=\"attachment-large size-large wp-image-134\" alt=\"\" srcset=\"https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/pump-1000.jpg 500w, https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/pump-1000-300x194.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c5cfee8 elementor-widget elementor-widget-text-editor\" data-id=\"c5cfee8\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"flex-grow-1 container-fluid p-0 m-0\" role=\"main\"><div id=\"thick\" class=\"mx-auto mb-3\"><div id=\"kcBodyContainer\" class=\"row\"><main class=\"col-12 col-lg-9 px-2 px-lg-0\"><div id=\"kcbody\" data-gtmid=\"isSC\"><div class=\"kccaption\">In table 3, when the Equivalent Distance is increased to 1000 ft., neither single nor dual stage regen pumps will transport material. The PD pump will transport limited material rates with little margin for error. Higher vacuum technologies are most likely be required.<\/div><\/div><\/main><\/div><\/div><\/div><footer class=\"pt-4\"><div class=\"container text-white\"><div class=\"row mb-4\"><section class=\"col-12 col-lg-3 mb-4 mb-lg-0\"><div class=\"mb-3 d-flex\">\u00a0<\/div><\/section><\/div><\/div><\/footer>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-546e1eb6 e-con-full e-flex e-con e-child\" data-id=\"546e1eb6\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-41da6de2 elementor-widget elementor-widget-shortcode\" data-id=\"41da6de2\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\">\t\t<div data-elementor-type=\"section\" data-elementor-id=\"632\" class=\"elementor elementor-632\" data-elementor-post-type=\"elementor_library\">\n\t\t\t<div class=\"elementor-element elementor-element-f5e2127 e-flex e-con-boxed e-con e-parent\" data-id=\"f5e2127\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-f739977 e-con-full e-flex e-con e-child\" data-id=\"f739977\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cc9d922 elementor-widget elementor-widget-heading\" data-id=\"cc9d922\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Ask the Expert<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3583113 elementor-widget elementor-widget-image\" data-id=\"3583113\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"777\" src=\"https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/Conveying-Expert-0623-copy-768x777.png\" class=\"attachment-medium_large size-medium_large wp-image-2422\" alt=\"\" srcset=\"https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/Conveying-Expert-0623-copy-768x777.png 768w, https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/Conveying-Expert-0623-copy-296x300.png 296w, https:\/\/www.novatec.com\/knowledge-center\/wp-content\/uploads\/2024\/08\/Conveying-Expert-0623-copy.png 1000w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Ryan Ismirlian, Conveying Product Engineer Novatec, 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