{"id":293,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/vane-passing-frequency\/"},"modified":"2026-05-23T22:46:43","modified_gmt":"2026-05-23T22:46:43","slug":"vane-passing-frequency","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/bn\/glossary\/vane-passing-frequency\/","title":{"rendered":"What is Vane Passing Frequency? Pump Blade Diagnostics"},"content":{"rendered":"<h1>Understanding Vane Passing Frequency<\/h1>\n\t\t<section class=\"woocommerce hestia-shop products is-shortcode\" id=\"products\" data-sorder=\"hestia_shop\" >\n\t\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<div class=\"hestia-shop-content\">\n\t\t\t<div class=\"row\" data-aos=\"fade-up\" >\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/bn\/product\/balanset-1\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/bn\/product\/balanset-1\/\" title=\"\u09aa\u09cb\u09b0\u09cd\u099f\u09c7\u09ac\u09b2 \u09ac\u09cd\u09af\u09be\u09b2\u09c7\u09a8\u09cd\u09b8\u09be\u09b0 \u098f\u09ac\u0982 \u0995\u09ae\u09cd\u09aa\u09a8 \u09ac\u09bf\u09b6\u09cd\u09b2\u09c7\u09b7\u0995 \u09ac\u09cd\u09af\u09be\u09b2\u09be\u09a8\u09b8\u09c7\u099f-1A\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A \u09b8\u09ae\u09cd\u09aa\u09c2\u09b0\u09cd\u09a3 \u0995\u09bf\u099f \u09aa\u09cb\u09b0\u09cd\u099f\u09c7\u09ac\u09b2 \u09ac\u09cd\u09af\u09be\u09b2\u09c7\u09a8\u09cd\u09b8\u09be\u09b0 \u098f\u09ac\u0982 \u0995\u09ae\u09cd\u09aa\u09a8 \u09ac\u09bf\u09b6\u09cd\u09b2\u09c7\u09b7\u0995\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-272x182.webp 272w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/bn\/product-category\/devices\/\" rel=\"tag\">\u09a1\u09bf\u09ad\u09be\u0987\u09b8<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/bn\/product\/balanset-1\/\" title=\"\u09aa\u09cb\u09b0\u09cd\u099f\u09c7\u09ac\u09b2 \u09ac\u09cd\u09af\u09be\u09b2\u09c7\u09a8\u09cd\u09b8\u09be\u09b0 \u098f\u09ac\u0982 \u0995\u09ae\u09cd\u09aa\u09a8 \u09ac\u09bf\u09b6\u09cd\u09b2\u09c7\u09b7\u0995 \u09ac\u09cd\u09af\u09be\u09b2\u09be\u09a8\u09b8\u09c7\u099f-1A\">\u09aa\u09cb\u09b0\u09cd\u099f\u09c7\u09ac\u09b2 \u09ac\u09cd\u09af\u09be\u09b2\u09c7\u09a8\u09cd\u09b8\u09be\u09b0 \u098f\u09ac\u0982 \u0995\u09ae\u09cd\u09aa\u09a8 \u09ac\u09bf\u09b6\u09cd\u09b2\u09c7\u09b7\u0995 \u09ac\u09cd\u09af\u09be\u09b2\u09be\u09a8\u09b8\u09c7\u099f-1A<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>1,975.00<\/span> + \u09ad\u09cd\u09af\u09be\u099f (\u09af\u09a6\u09bf \u09aa\u09cd\u09b0\u09af\u09cb\u099c\u09cd\u09af \u09b9\u09af\u09bc)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/bn\/wp-json\/wp\/v2\/glossary\/293?add-to-cart=986\" data-quantity=\"1\" data-product_id=\"986\" data-product_sku=\"BS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  \" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  \" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/bn\/wp-json\/wp\/v2\/glossary\/293?add-to-cart=986\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_986\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"986\" data-product_sku=\"BS-1\" aria-label=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8: \u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d\" rel=\"nofollow\" data-success_message=\"\u0986\u09aa\u09a8\u09be\u09b0 \u0995\u09be\u09b0\u09cd\u099f\u09c7 \u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d \u09af\u09cb\u0997 \u0995\u09b0\u09be \u09b9\u09af\u09bc\u09c7\u099b\u09c7\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  <\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_986\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/bn\/product\/vibration-sensor\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/bn\/product\/vibration-sensor\/\" title=\"\u0995\u09ae\u09cd\u09aa\u09a8 \u09b8\u09c7\u09a8\u09cd\u09b8\u09b0\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A \u0995\u09ae\u09cd\u09aa\u09a8 \u09b8\u09c7\u09a8\u09cd\u09b8\u09b0 \u0995\u09cd\u09b2\u09cb\u099c-\u0986\u09aa\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/bn\/product-category\/parts\/\" rel=\"tag\">\u0985\u0982\u09b6<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/bn\/product\/vibration-sensor\/\" title=\"\u0995\u09ae\u09cd\u09aa\u09a8 \u09b8\u09c7\u09a8\u09cd\u09b8\u09b0\">\u0995\u09ae\u09cd\u09aa\u09a8 \u09b8\u09c7\u09a8\u09cd\u09b8\u09b0<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>90.00<\/span> + \u09ad\u09cd\u09af\u09be\u099f (\u09af\u09a6\u09bf \u09aa\u09cd\u09b0\u09af\u09cb\u099c\u09cd\u09af \u09b9\u09af\u09bc)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/bn\/wp-json\/wp\/v2\/glossary\/293?add-to-cart=1820\" data-quantity=\"1\" data-product_id=\"1820\" data-product_sku=\"VS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  \" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  \" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/bn\/wp-json\/wp\/v2\/glossary\/293?add-to-cart=1820\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1820\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1820\" data-product_sku=\"VS-1\" aria-label=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8: \u201cVibration sensor\u201d\" rel=\"nofollow\" data-success_message=\"\u0986\u09aa\u09a8\u09be\u09b0 \u0995\u09be\u09b0\u09cd\u099f\u09c7 \u201cVibration sensor\u201d \u09af\u09cb\u0997 \u0995\u09b0\u09be \u09b9\u09af\u09bc\u09c7\u099b\u09c7\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  <\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1820\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/bn\/product\/optical-sensor-for-balanset-and-arbalance\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/bn\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"\u0985\u09aa\u099f\u09bf\u0995\u09cd\u09af\u09be\u09b2 \u09b8\u09c7\u09a8\u09cd\u09b8\u09b0 (\u09b2\u09c7\u099c\u09be\u09b0 \u099f\u09cd\u09af\u09be\u0995\u09cb\u09ae\u09bf\u099f\u09be\u09b0)\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\u0985\u09aa\u099f\u09bf\u0995\u09cd\u09af\u09be\u09b2 \u09b8\u09c7\u09a8\u09cd\u09b8\u09b0 (\u09b2\u09c7\u099c\u09be\u09b0 \u099f\u09cd\u09af\u09be\u0995\u09cb\u09ae\u09bf\u099f\u09be\u09b0)\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1536x1023.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU.webp 1600w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/bn\/product-category\/parts\/\" rel=\"tag\">\u0985\u0982\u09b6<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/bn\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"\u0985\u09aa\u099f\u09bf\u0995\u09cd\u09af\u09be\u09b2 \u09b8\u09c7\u09a8\u09cd\u09b8\u09b0 (\u09b2\u09c7\u099c\u09be\u09b0 \u099f\u09cd\u09af\u09be\u0995\u09cb\u09ae\u09bf\u099f\u09be\u09b0)\">\u0985\u09aa\u099f\u09bf\u0995\u09cd\u09af\u09be\u09b2 \u09b8\u09c7\u09a8\u09cd\u09b8\u09b0 (\u09b2\u09c7\u099c\u09be\u09b0 \u099f\u09cd\u09af\u09be\u0995\u09cb\u09ae\u09bf\u099f\u09be\u09b0)<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>124.00<\/span> + \u09ad\u09cd\u09af\u09be\u099f (\u09af\u09a6\u09bf \u09aa\u09cd\u09b0\u09af\u09cb\u099c\u09cd\u09af \u09b9\u09af\u09bc)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/bn\/wp-json\/wp\/v2\/glossary\/293?add-to-cart=1832\" data-quantity=\"1\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  \" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  \" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/bn\/wp-json\/wp\/v2\/glossary\/293?add-to-cart=1832\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1832\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" aria-label=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8: \u201cOptical Sensor (Laser Tachometer)\u201d\" rel=\"nofollow\" data-success_message=\"\u0986\u09aa\u09a8\u09be\u09b0 \u0995\u09be\u09b0\u09cd\u099f\u09c7 \u201cOptical Sensor (Laser Tachometer)\u201d \u09af\u09cb\u0997 \u0995\u09b0\u09be \u09b9\u09af\u09bc\u09c7\u099b\u09c7\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  <\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1832\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/bn\/product\/balanset-4\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/bn\/product\/balanset-4\/\" title=\"\u09ac\u09cd\u09af\u09be\u09b2\u09be\u09a8\u09b8\u09c7\u099f-4\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Vibromera \u09b0\u09cb\u099f\u09b0 \u09ad\u09be\u09b0\u09b8\u09be\u09ae\u09cd\u09af \u0995\u09bf\u099f: \u09ac\u09b9\u09a8 \u0995\u09c7\u09b8, \u09ae\u09be\u09b2\u09cd\u099f\u09bf-\u099a\u09cd\u09af\u09be\u09a8\u09c7\u09b2 \u09b8\u09bf\u0997\u09a8\u09cd\u09af\u09be\u09b2 \u0995\u09a8\u09cd\u09a1\u09bf\u09b6\u09a8\u09be\u09b0, \u09b9\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09b9\u09c7\u09b2\u09cd\u09a1 \u09ac\u09bf\u09b6\u09cd\u09b2\u09c7\u09b7\u0995, \u099a\u09cc\u09ae\u09cd\u09ac\u0995 \u09ad\u09bf\u09a4\u09cd\u09a4\u09bf, \u0995\u09ae\u09cd\u09aa\u09a8 \u09b8\u09c7\u09a8\u09cd\u09b8\u09b0, \u098f\u09ac\u0982 \u0995\u09c1\u09a3\u09cd\u09a1\u09b2\u09c0 \u09a4\u09be\u09b0\u0964\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4.webp 640w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/bn\/product-category\/devices\/\" rel=\"tag\">\u09a1\u09bf\u09ad\u09be\u0987\u09b8<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/bn\/product\/balanset-4\/\" title=\"\u09ac\u09cd\u09af\u09be\u09b2\u09be\u09a8\u09b8\u09c7\u099f-4\">\u09ac\u09cd\u09af\u09be\u09b2\u09be\u09a8\u09b8\u09c7\u099f-4<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>6,803.00<\/span> + \u09ad\u09cd\u09af\u09be\u099f (\u09af\u09a6\u09bf \u09aa\u09cd\u09b0\u09af\u09cb\u099c\u09cd\u09af \u09b9\u09af\u09bc)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/bn\/wp-json\/wp\/v2\/glossary\/293?add-to-cart=1833\" data-quantity=\"1\" data-product_id=\"1833\" data-product_sku=\"BS-4\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  \" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  \" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/bn\/wp-json\/wp\/v2\/glossary\/293?add-to-cart=1833\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1833\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1833\" data-product_sku=\"BS-4\" aria-label=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8: \u201cBalanset-4\u201d\" rel=\"nofollow\" data-success_message=\"\u0986\u09aa\u09a8\u09be\u09b0 \u0995\u09be\u09b0\u09cd\u099f\u09c7 \u201cBalanset-4\u201d \u09af\u09cb\u0997 \u0995\u09b0\u09be \u09b9\u09af\u09bc\u09c7\u099b\u09c7\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  <\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1833\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div><!-- \/.row --><div class=\"row\">\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/bn\/product\/magnet-stand\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/bn\/product\/magnet-stand\/\" title=\"\u09ae\u09cd\u09af\u09be\u0997\u09a8\u09c7\u099f\u09bf\u0995 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1 \u0987\u09a8\u09b8\u09be\u0987\u099c-60-kgf\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\u099a\u09c1\u09ae\u09cd\u09ac\u0995 \u09ac\u09c7\u09b8\u0964\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/bn\/product-category\/parts\/\" rel=\"tag\">\u0985\u0982\u09b6<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/bn\/product\/magnet-stand\/\" title=\"\u09ae\u09cd\u09af\u09be\u0997\u09a8\u09c7\u099f\u09bf\u0995 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1 \u0987\u09a8\u09b8\u09be\u0987\u099c-60-kgf\">\u09ae\u09cd\u09af\u09be\u0997\u09a8\u09c7\u099f\u09bf\u0995 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1 \u0987\u09a8\u09b8\u09be\u0987\u099c-60-kgf<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>46.00<\/span> + \u09ad\u09cd\u09af\u09be\u099f (\u09af\u09a6\u09bf \u09aa\u09cd\u09b0\u09af\u09cb\u099c\u09cd\u09af \u09b9\u09af\u09bc)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/bn\/wp-json\/wp\/v2\/glossary\/293?add-to-cart=1852\" data-quantity=\"1\" data-product_id=\"1852\" data-product_sku=\"MS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  \" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  \" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/bn\/wp-json\/wp\/v2\/glossary\/293?add-to-cart=1852\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1852\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1852\" data-product_sku=\"MS-1\" aria-label=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8: \u201cMagnetic Stand Insize-60-kgf\u201d\" rel=\"nofollow\" data-success_message=\"\u0986\u09aa\u09a8\u09be\u09b0 \u0995\u09be\u09b0\u09cd\u099f\u09c7 \u201cMagnetic Stand Insize-60-kgf\u201d \u09af\u09cb\u0997 \u0995\u09b0\u09be \u09b9\u09af\u09bc\u09c7\u099b\u09c7\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  <\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1852\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/bn\/product\/reflective-tape\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/bn\/product\/reflective-tape\/\" title=\"\u09aa\u09cd\u09b0\u09a4\u09bf\u09ab\u09b2\u09bf\u09a4 \u099f\u09c7\u09aa\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\u09aa\u09cd\u09b0\u09a4\u09bf\u09ab\u09b2\u09bf\u09a4 \u099f\u09c7\u09aa\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-16x12.webp 16w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-272x182.webp 272w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/bn\/product-category\/parts\/\" rel=\"tag\">\u0985\u0982\u09b6<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/bn\/product\/reflective-tape\/\" title=\"\u09aa\u09cd\u09b0\u09a4\u09bf\u09ab\u09b2\u09bf\u09a4 \u099f\u09c7\u09aa\">\u09aa\u09cd\u09b0\u09a4\u09bf\u09ab\u09b2\u09bf\u09a4 \u099f\u09c7\u09aa<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>10.00<\/span> + \u09ad\u09cd\u09af\u09be\u099f (\u09af\u09a6\u09bf \u09aa\u09cd\u09b0\u09af\u09cb\u099c\u09cd\u09af \u09b9\u09af\u09bc)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/bn\/wp-json\/wp\/v2\/glossary\/293?add-to-cart=2329\" data-quantity=\"1\" data-product_id=\"2329\" data-product_sku=\"rt-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  \" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  \" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/bn\/wp-json\/wp\/v2\/glossary\/293?add-to-cart=2329\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_2329\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"2329\" data-product_sku=\"rt-1\" aria-label=\"\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8: \u201cReflective tape\u201d\" rel=\"nofollow\" 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&quot;\u09ac\u09cd\u09af\u09be\u09b2\u09be\u09a8\u09b8\u09c7\u099f-1A&quot; OEM\">\u09a1\u09be\u09af\u09bc\u09a8\u09be\u09ae\u09bf\u0995 \u09ac\u09cd\u09af\u09be\u09b2\u09c7\u09a8\u09cd\u09b8\u09be\u09b0 &quot;\u09ac\u09cd\u09af\u09be\u09b2\u09be\u09a8\u09b8\u09c7\u099f-1A&quot; OEM<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>1,735.00<\/span> + \u09ad\u09cd\u09af\u09be\u099f (\u09af\u09a6\u09bf \u09aa\u09cd\u09b0\u09af\u09cb\u099c\u09cd\u09af \u09b9\u09af\u09bc)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/bn\/wp-json\/wp\/v2\/glossary\/293?add-to-cart=4193\" data-quantity=\"1\" data-product_id=\"4193\" data-product_sku=\"BS-1OEM\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon 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\u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d \u09af\u09cb\u0997 \u0995\u09b0\u09be \u09b9\u09af\u09bc\u09c7\u099b\u09c7\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">\u0995\u09be\u09b0\u09cd\u099f\u09c7 \u09af\u09cb\u0997 \u0995\u09b0\u09c1\u09a8  <\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_4193\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/section>\n\t\t\n<p><strong>Vane passing frequency<\/strong> (VPF \u2014 also called impeller vane frequency or simply vane pass) is the frequency at which the vanes of a rotating pump impeller sweep past a stationary reference point such as the volute cutwater (tongue), diffuser vanes, or another casing feature. It is calculated as the number of impeller vanes multiplied by the shaft rotational frequency: <strong>VPF = N<sub>v<\/sub> \u00d7 RPM \/ 60<\/strong>. VPF is the direct pump equivalent of the <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/blade-passing-frequency\/\">\u09ac\u09cd\u09b2\u09c7\u09a1 \u09aa\u09be\u09b8\u09bf\u0982 \u09ab\u09cd\u09b0\u09bf\u0995\u09cb\u09af\u09bc\u09c7\u09a8\u09cd\u09b8\u09bf<\/a> seen in fans, and it is the dominant hydraulic <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/vibration\/\">vibration<\/a> source in centrifugal pumps, typically appearing between 100 and 500 Hz for industrial machines. Tracking VPF amplitude and its <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/harmonics\/\">harmonics<\/a> yields critical diagnostic information about impeller condition, hydraulic performance, and internal clearances.<\/p>\n<h2>1. Calculation and Typical Values<\/h2>\n<h3>Formula<\/h3>\n<blockquote><p><strong>VPF = N<sub>v<\/sub> \u00d7 N \/ 60<\/strong> &nbsp; where N<sub>v<\/sub> = number of impeller vanes, N = shaft speed in RPM, and the result is in Hz.<\/p><\/blockquote>\n<p>Because VPF is always a whole-number multiple of the <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/running-speed\/\">running speed<\/a> (1\u00d7), it sits firmly among the synchronous components of the spectrum \u2014 it is a true blade-rate <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/harmonics\/\">harmonic<\/a> of shaft speed, not an independent frequency.<\/p>\n<h3>Worked examples<\/h3>\n<ul>\n<li><strong>Small pump:<\/strong> 5 vanes at 3500 RPM \u2192 VPF = 5 \u00d7 3500 \/ 60 = <strong>292 Hz<\/strong>.<\/li>\n<li><strong>Large process pump:<\/strong> 7 vanes at 1750 RPM \u2192 VPF = 7 \u00d7 1750 \/ 60 = <strong>204 Hz<\/strong>.<\/li>\n<li><strong>High-speed pump:<\/strong> 6 vanes at 4200 RPM \u2192 VPF = 6 \u00d7 4200 \/ 60 = <strong>420 Hz<\/strong>.<\/li>\n<\/ul>\n<h3>Typical vane counts<\/h3>\n<ul>\n<li><strong>\u0995\u09c7\u09a8\u09cd\u09a6\u09cd\u09b0\u09c0\u09af\u09bc \u09aa\u09be\u09ae\u09cd\u09aa:<\/strong> 3\u201312 vanes, with 5\u20137 the most common.<\/li>\n<li><strong>Small pumps:<\/strong> fewer vanes (3\u20135).<\/li>\n<li><strong>Large pumps:<\/strong> more vanes (7\u201312).<\/li>\n<li><strong>High-head pumps:<\/strong> more vanes to transfer energy effectively.<\/li>\n<\/ul>\n<p>Knowing the exact vane count is essential, because it is what separates VPF from a coincidental shaft harmonic; if the impeller drawing is unavailable, the vane number can often be confirmed by counting the harmonic order at which the dominant hydraulic peak lands. The <a href=\"https:\/\/vibromera.eu\/bn\/calculators\/blade-pass-frequency\/\">\u09ac\u09cd\u09b2\u09c7\u09a1 \u09aa\u09be\u09b8 \u09ab\u09cd\u09b0\u09bf\u0995\u09cb\u09af\u09bc\u09c7\u09a8\u09cd\u09b8\u09bf \u0995\u09cd\u09af\u09be\u09b2\u0995\u09c1\u09b2\u09c7\u099f\u09b0<\/a> handles the arithmetic for both pumps and fans, and the <a href=\"https:\/\/vibromera.eu\/bn\/calculators\/harmonic-frequency-calculator\/\">\u09b9\u09be\u09b0\u09ae\u09cb\u09a8\u09bf\u0995 \u09ab\u09cd\u09b0\u09bf\u0995\u09cb\u09af\u09bc\u09c7\u09a8\u09cd\u09b8\u09bf \u0995\u09cd\u09af\u09be\u09b2\u0995\u09c1\u09b2\u09c7\u099f\u09b0<\/a> helps place VPF and its multiples on the frequency axis.<\/p>\n<h2>2. \u09ab\u09bf\u099c\u09bf\u0995\u09cd\u09af\u09be\u09b2 \u09ae\u09c7\u0995\u09be\u09a8\u09bf\u099c\u09ae<\/h2>\n<h3>Pressure pulsations<\/h3>\n<p>VPF originates in hydraulic pressure variation rather than mechanical force. The sequence is:<\/p>\n<ol>\n<li>Each impeller vane carries fluid outward at high velocity.<\/li>\n<li>As a vane sweeps past the volute cutwater, it generates a sharp pressure pulse.<\/li>\n<li>The pressure differential across the vane changes rapidly at that instant.<\/li>\n<li>This produces a force pulse on both the impeller and the casing.<\/li>\n<li>With N<sub>v<\/sub> vanes, N<sub>v<\/sub> such pulses occur every revolution.<\/li>\n<li>The resulting pulsation frequency equals the vane-pass rate \u2014 the VPF.<\/li>\n<\/ol>\n<p>This makes VPF one of the classic <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/hydraulic-forces\/\">\u09b9\u09be\u0987\u09a1\u09cd\u09b0\u09cb\u09b2\u09bf\u0995 \u09b6\u0995\u09cd\u09a4\u09bf<\/a> acting on a pump, distinct from purely mechanical excitations such as <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/unbalance\/\">unbalance<\/a> or bearing defects.<\/p>\n<h3>At the design point (BEP)<\/h3>\n<ul>\n<li>The incoming flow angle matches the vane angle.<\/li>\n<li>Flow is smooth, with minimal turbulence.<\/li>\n<li>VPF amplitude is moderate and stable.<\/li>\n<li>Pressure distribution around the casing is near-optimal.<\/li>\n<\/ul>\n<h3>Away from the design point<\/h3>\n<ul>\n<li>Flow angle no longer matches the vane angle.<\/li>\n<li>Turbulence and flow separation increase.<\/li>\n<li>Pressure pulsations grow stronger.<\/li>\n<li>VPF amplitude rises, often with additional frequency components.<\/li>\n<\/ul>\n<h2>\u09e9. \u09a1\u09be\u09af\u09bc\u09be\u0997\u09a8\u09b8\u09cd\u099f\u09bf\u0995 \u09ac\u09cd\u09af\u09be\u0996\u09cd\u09af\u09be<\/h2>\n<h3>Normal VPF amplitude<\/h3>\n<ul>\n<li>Pump operating at or near its best efficiency point (BEP).<\/li>\n<li>VPF amplitude stable over successive measurements.<\/li>\n<li>Typically 10\u201330% of the 1\u00d7 vibration amplitude.<\/li>\n<li>A clean spectrum with minimal harmonic content.<\/li>\n<\/ul>\n<h3>What elevated VPF tells you<\/h3>\n<p><strong>Operating off BEP.<\/strong> Low-flow operation (below ~70% of BEP) raises VPF, as does high-flow operation (above ~120% of BEP); the optimal band is roughly 80\u2013110% of BEP. Sustained low-flow running is also linked to <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/recirculation\/\">internal recirculation<\/a>.<\/p>\n<p><strong>Impeller-to-casing clearance problems.<\/strong> Worn wear rings, or an impeller shifted by <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/bearing-wear\/\">bearing wear<\/a>, increase the running clearance; VPF amplitude climbs as clearance opens up, accompanied by performance loss through internal leakage.<\/p>\n<p><strong>Impeller damage.<\/strong> Broken or cracked vanes create asymmetry, producing VPF with <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/sidebands\/\">sidebands<\/a> at \u00b11\u00d7 running speed; erosion, build-up on the vanes, or foreign-object damage act similarly. These are typical of broader <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/impeller-defects\/\">\u0987\u09ae\u09cd\u09aa\u09c7\u09b2\u09be\u09b0 \u09a4\u09cd\u09b0\u09c1\u099f\u09bf<\/a>.<\/p>\n<p><strong>Hydraulic resonance.<\/strong> If VPF happens to coincide with an acoustic <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/resonance\/\">resonance<\/a> in the piping or casing, the amplitude is dramatically amplified, sometimes driving severe structural vibration and noise that demands system modifications.<\/p>\n<h2>4. VPF Harmonics and Subharmonics<\/h2>\n<h3>2\u00d7VPF and higher<\/h3>\n<p>Multiple harmonics of the vane-pass rate are a warning sign:<\/p>\n<ul>\n<li><strong>2\u00d7VPF present:<\/strong> suggests non-uniform vane spacing or impeller eccentricity.<\/li>\n<li><strong>\u098f\u0995\u09be\u09a7\u09bf\u0995 \u09b9\u09be\u09b0\u09ae\u09cb\u09a8\u09bf\u0995\u09cd\u09b8:<\/strong> point to severe hydraulic turbulence or vane damage.<\/li>\n<li><strong>Excessive amplitudes:<\/strong> raise the risk of <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/fatigue\/\">fatigue<\/a> failures in vanes and casing.<\/li>\n<\/ul>\n<h3>Subharmonics<\/h3>\n<ul>\n<li>Fractional components such as VPF\/2 or VPF\/3.<\/li>\n<li>Indicate flow instabilities, including rotating stall and separation cells.<\/li>\n<li>Most common at very low flow rates, and akin to other <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/subharmonic\/\">subharmonic<\/a> phenomena.<\/li>\n<\/ul>\n<h2>5. Monitoring and Trending<\/h2>\n<h3>\u09ac\u09c7\u09b8\u09b2\u09be\u0987\u09a8 \u09b8\u09cd\u09a5\u09be\u09aa\u09a8 \u0995\u09b0\u09be<\/h3>\n<ul>\n<li>Record VPF when the pump is new or freshly overhauled.<\/li>\n<li>Document it at the design operating point.<\/li>\n<li>Establish the normal VPF-to-1\u00d7 amplitude ratio.<\/li>\n<li>Set alarm limits, commonly 2\u20133\u00d7 the baseline VPF amplitude.<\/li>\n<\/ul>\n<h3>Trending parameters<\/h3>\n<ul>\n<li><strong>VPF amplitude:<\/strong> tracked over time; a steady rise signals a developing problem.<\/li>\n<li><strong>VPF\/1\u00d7 ratio:<\/strong> should stay relatively constant.<\/li>\n<li><strong>\u09b8\u09c1\u09b0\u09c7\u09b2\u09be \u09b8\u09be\u09ae\u0997\u09cd\u09b0\u09c0:<\/strong> the appearance or growth of 2\u00d7VPF and 3\u00d7VPF.<\/li>\n<li><strong>Sideband development:<\/strong> emergence of \u00b11\u00d7 sidebands around VPF.<\/li>\n<\/ul>\n<h3>Correlating with operating conditions<\/h3>\n<ul>\n<li>Plot VPF against flow rate.<\/li>\n<li>Identify the operating zone of minimum VPF.<\/li>\n<li>Detect when the duty point has drifted.<\/li>\n<li>Correlate VPF behaviour with measured performance degradation.<\/li>\n<\/ul>\n<p>This kind of <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/trend-analysis\/\">trend analysis<\/a> depends on consistent, repeatable spectra. A portable two-channel analyser such as the <a href=\"https:\/\/vibromera.eu\/bn\/%e0%a6%aa%e0%a6%a3%e0%a7%8d%e0%a6%af\/balanset-1\/\">\u09ac\u09cd\u09af\u09be\u09b2\u09be\u09a8\u09b8\u09c7\u099f-\u09e7\u098f<\/a> captures the <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/spectrum\/\">FFT \u09ac\u09b0\u09cd\u09a3\u09be\u09b2\u09c0<\/a> with VPF clearly resolved in the 100\u2013500 Hz hydraulic region, so a technician can confirm the vane-pass peak, watch its amplitude and sidebands from visit to visit, and rule mechanical <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/unbalance\/\">unbalance<\/a> in or out before opening the pump.<\/p>\n<h2>6. \u09b8\u0982\u09b6\u09cb\u09a7\u09a8\u09ae\u09c2\u09b2\u0995 \u09aa\u09a6\u0995\u09cd\u09b7\u09c7\u09aa<\/h2>\n<h3>Operating-point optimisation<\/h3>\n<ul>\n<li>Adjust flow to bring the pump nearer to BEP.<\/li>\n<li>Throttle the discharge or alter system resistance.<\/li>\n<li>Verify that suction conditions are adequate.<\/li>\n<\/ul>\n<h3>\u09af\u09be\u09a8\u09cd\u09a4\u09cd\u09b0\u09bf\u0995 \u09b8\u0982\u09b6\u09cb\u09a7\u09a8<\/h3>\n<ul>\n<li>Replace worn wear rings to restore design clearances.<\/li>\n<li>Replace a worn or damaged impeller.<\/li>\n<li>Correct bearing problems that allow the impeller to shift.<\/li>\n<li>Verify correct impeller position, both axial and radial.<\/li>\n<\/ul>\n<h3>Hydraulic improvements<\/h3>\n<ul>\n<li>Improve inlet piping to reduce pre-swirl and turbulence.<\/li>\n<li>Fit flow straighteners where appropriate.<\/li>\n<li>Verify an adequate NPSH margin to avoid <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/cavitation\/\">cavitation<\/a>.<\/li>\n<li>Eliminate air entrainment.<\/li>\n<\/ul>\n<h2>7. Relationship to Other Frequencies<\/h2>\n<h3>VPF versus BPF<\/h3>\n<ul>\n<li>The terms are often used interchangeably across pumps and fans.<\/li>\n<li><strong>VPF:<\/strong> the preferred term for pumps (vanes moving liquid).<\/li>\n<li><strong>BPF:<\/strong> the preferred term for fans (blades moving air).<\/li>\n<li>The calculation and diagnostic approach are identical.<\/li>\n<\/ul>\n<h3>VPF versus running speed<\/h3>\n<ul>\n<li>VPF = N<sub>v<\/sub> \u00d7 (running-speed frequency).<\/li>\n<li>VPF is always a higher frequency than 1\u00d7.<\/li>\n<li>For a 7-vane impeller, for instance, VPF lands exactly at 7\u00d7 running speed.<\/li>\n<\/ul>\n<p>Vane passing frequency is the fundamental hydraulic vibration component of every centrifugal pump. Mastering its calculation, recognising normal versus elevated amplitudes, and correlating its patterns with both operating conditions and pump condition turns a single spectral peak into a powerful diagnostic \u2014 guiding sound decisions about duty-point optimisation, clearance restoration, and impeller replacement. It is a cornerstone of broader <a href=\"https:\/\/vibromera.eu\/bn\/glossary\/pump-defects\/\">pump fault diagnosis<\/a>.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/bn\/glossary\/\">\u2190 \u09aa\u09cd\u09b0\u09a7\u09be\u09a8 \u09b8\u09c2\u099a\u09bf\u09a4\u09c7 \u09ab\u09bf\u09b0\u09c1\u09a8<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Learn about vane passing frequency (VPF), the rate at which pump impeller vanes pass stationary diffuser or volute cutwater, essential for diagnosing hydraulic and mechanical issues.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[114,109],"tags":[],"class_list":["post-293","glossary","type-glossary","status-publish","hentry","category-analysis","category-glossary"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/glossary\/293","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/glossary\/293\/revisions"}],"predecessor-version":[{"id":101369,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/glossary\/293\/revisions\/101369"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/media?parent=293"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/categories?post=293"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/bn\/wp-json\/wp\/v2\/tags?post=293"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}