{"id":13,"date":"2026-08-31T08:49:11","date_gmt":"2026-08-31T08:49:11","guid":{"rendered":"https:\/\/vas.co.th\/?page_id=13"},"modified":"2026-08-31T10:00:39","modified_gmt":"2026-08-31T10:00:39","slug":"closed-semi-open-open-impellers","status":"publish","type":"page","link":"https:\/\/vas.co.th\/?page_id=13","title":{"rendered":"Open, Semi-Open and Closed Impellers"},"content":{"rendered":"\n<div class=\"vas-page vas-knowledge-article\">\n<section class=\"vas-article-hero vas-section\">\n<div class=\"vas-container vas-article-shell\">\n<nav class=\"vas-breadcrumbs\" aria-label=\"Breadcrumb\"><a href=\"https:\/\/vas.co.th\/\">Home<\/a><span>\/<\/span><a href=\"https:\/\/vas.co.th\/?page_id=9\">Knowledge Center<\/a><span>\/<\/span><span aria-current=\"page\">Open, Semi-Open and Closed Impellers<\/span><\/nav>\n<p class=\"vas-eyebrow\">Water Pumps<\/p>\n<h1>Open, Semi-Open and Closed Impellers<\/h1>\n<p class=\"vas-lead\">Impellers are often classified first by how their vanes are supported or enclosed. This construction influences efficiency, pressure capability, solids passage, clog resistance, wear, and maintenance.<\/p>\n<\/div>\n<\/section>\n<section class=\"vas-section vas-section--white\">\n<div class=\"vas-container vas-article-shell\">\n<article class=\"vas-article-body\">\n<div class=\"vas-impeller-guide\">\n<figure class=\"vas-impeller-comparison\" aria-label=\"Comparison of open, semi-open, and closed centrifugal impeller constructions\">\n<div class=\"vas-local-technical-figure__viewport\"><a href=\"https:\/\/vas.co.th\/wp-content\/plugins\/vas-site-prototype-plugin\/assets\/technical\/Impeller%20Types%20(types%20of%20impeller).png\" target=\"_blank\" rel=\"noopener\" aria-label=\"Open the impeller construction guide at full size\"><img decoding=\"async\" src=\"https:\/\/vas.co.th\/wp-content\/plugins\/vas-site-prototype-plugin\/assets\/technical\/Impeller%20Types%20(types%20of%20impeller).png\" alt=\"Guide comparing open, semi-open, and closed impeller construction, with examples of specialized and non-clogging designs in each group.\" loading=\"lazy\"><\/a><\/div><figcaption><strong>Visual guide:<\/strong> compare the shrouds around the vanes, then use the quick cards below. Select the image to enlarge it.<\/figcaption><\/figure>\n<section class=\"vas-impeller-summary\" aria-labelledby=\"vas-impeller-summary-title\">\n<header>\n<p class=\"vas-eyebrow\">Quick comparison<\/p>\n<h2 id=\"vas-impeller-summary-title\">Choose by Construction<\/h2>\n<p>Construction changes how the impeller balances efficiency, pressure and solids handling.<\/p>\n<\/header>\n<p class=\"vas-impeller-summary__hint\">Swipe the cards to compare <span aria-hidden=\"true\">\u2192<\/span><\/p>\n<div class=\"vas-impeller-summary__grid\" tabindex=\"0\" aria-label=\"Open, semi-open, and closed impeller comparison cards\">\n<article class=\"vas-impeller-summary__card vas-impeller-summary__card--open\"><span>01<\/span><\/p>\n<h3>Open<\/h3>\n<p>Vanes are exposed without a front shroud, making the passages easier to inspect and clean.<\/p>\n<dl>\n<div>\n<dt>Best for<\/dt>\n<dd>Fibrous, viscous or solids-laden liquids where clog resistance matters.<\/dd>\n<\/div>\n<div>\n<dt>Examples<\/dt>\n<dd>Vortex, channel, grinder and two- or three-vane designs.<\/dd>\n<\/div>\n<\/dl>\n<\/article>\n<article class=\"vas-impeller-summary__card vas-impeller-summary__card--semi\"><span>02<\/span><\/p>\n<h3>Semi-Open<\/h3>\n<p>One shroud supports the vanes while the opposite side remains open.<\/p>\n<dl>\n<div>\n<dt>Best for<\/dt>\n<dd>Wastewater, light slurry and process liquids with small to medium soft solids.<\/dd>\n<\/div>\n<div>\n<dt>Examples<\/dt>\n<dd>Semi-open vortex, channel, recessed, multi-vane and high-solids designs.<\/dd>\n<\/div>\n<\/dl>\n<\/article>\n<article class=\"vas-impeller-summary__card vas-impeller-summary__card--closed\"><span>03<\/span><\/p>\n<h3>Closed<\/h3>\n<p>Front and back shrouds enclose the vane passages for controlled flow and high efficiency.<\/p>\n<dl>\n<div>\n<dt>Best for<\/dt>\n<dd>Clean-water boosting, HVAC circulation, boiler feed and multistage service.<\/dd>\n<\/div>\n<div>\n<dt>Examples<\/dt>\n<dd>Standard multi-vane, two-vane closed, high-solids closed and inducer-assisted designs.<\/dd>\n<\/div>\n<\/dl>\n<\/article>\n<\/div>\n<\/section>\n<aside class=\"vas-impeller-fact\" aria-labelledby=\"vas-impeller-fact-title\">\n<div class=\"vas-impeller-fact__intro\">\n<p class=\"vas-eyebrow\">Did you know?<\/p>\n<h2 id=\"vas-impeller-fact-title\">Construction Is Only One Classification<\/h2>\n<p>The same impeller can belong to more than one group. A channel impeller, for example, may be open or closed.<\/p>\n<\/div>\n<div class=\"vas-impeller-fact__types\">\n<p><strong>Flow direction<\/strong><span>Radial \u00b7 Mixed-flow \u00b7 Axial<\/span><\/p>\n<p><strong>Inlet arrangement<\/strong><span>Single-suction \u00b7 Double-suction<\/span><\/p>\n<p><strong>Hydraulic form<\/strong><span>Channel \u00b7 Vortex \u00b7 Screw \u00b7 Chopper<\/span><\/p>\n<\/div>\n<\/aside>\n<\/div>\n<\/article>\n<aside class=\"vas-article-next\">\n<p class=\"vas-eyebrow\">Put it into practice<\/p>\n<h2>Discuss the Right Product for Your Needs<\/h2>\n<p>Use this guide as a starting point. Final selection should be confirmed against the actual system conditions and manufacturer specifications.<\/p>\n<div class=\"vas-actions\"><a class=\"vas-button\" href=\"https:\/\/vas.co.th\/?page_id=22\">Contact Us<\/a><a class=\"vas-button vas-button--secondary\" href=\"https:\/\/vas.co.th\/?page_id=7\">View Water Pumps<\/a><\/div>\n<p><a class=\"vas-text-link\" href=\"https:\/\/vas.co.th\/?page_id=9\">Back to the Knowledge Center <span class=\"vas-icon vas-icon--arrow-right \" aria-hidden=\"true\"><\/span><\/a><\/aside>\n<\/div>\n<\/section><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Home\/Knowledge Center\/Open, Semi-Open and Closed Impellers Water Pumps Open, Semi-Open and Closed Impellers Impellers are often classified first by how their vanes are supported or enclosed. This construction influences efficiency, pressure capability, solids passage, clog resistance, wear, and maintenance. Visual guide: compare the shrouds around the vanes, then use the quick cards below. Select the&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":9,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_kad_post_transparent":"","_kad_post_title":"hide","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"hide","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-13","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vas.co.th\/index.php?rest_route=\/wp\/v2\/pages\/13","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vas.co.th\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/vas.co.th\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/vas.co.th\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vas.co.th\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=13"}],"version-history":[{"count":1,"href":"https:\/\/vas.co.th\/index.php?rest_route=\/wp\/v2\/pages\/13\/revisions"}],"predecessor-version":[{"id":37,"href":"https:\/\/vas.co.th\/index.php?rest_route=\/wp\/v2\/pages\/13\/revisions\/37"}],"up":[{"embeddable":true,"href":"https:\/\/vas.co.th\/index.php?rest_route=\/wp\/v2\/pages\/9"}],"wp:attachment":[{"href":"https:\/\/vas.co.th\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}