{"id":207,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/recirculation\/"},"modified":"2026-05-23T22:53:11","modified_gmt":"2026-05-23T22:53:11","slug":"recirculation","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/sv\/glossary\/recirculation\/","title":{"rendered":"Vad \u00e4r recirkulation? Instabilitet hos pumpar med l\u00e5gt fl\u00f6de"},"content":{"rendered":"<h1>F\u00f6rst\u00e5 recirkulation i pumpar<\/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\/sv\/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\/sv\/product\/balanset-1\/\" title=\"Portabel balanserare &amp; vibrationsanalysator Balanset-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 komplett kit med portabel balanserare och vibrationsanalysator\" 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\/sv\/product-category\/devices\/\" rel=\"tag\">Enheter<\/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\/sv\/product\/balanset-1\/\" title=\"Portabel balanserare &amp; vibrationsanalysator Balanset-1A\">Portabel balanserare &amp; vibrationsanalysator Balanset-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> + moms (om till\u00e4mpligt)<\/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=\"\/sv\/wp-json\/wp\/v2\/glossary\/207?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=\"L\u00e4gg till i varukorg\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"L\u00e4gg till i varukorg\" 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=\"\/sv\/wp-json\/wp\/v2\/glossary\/207?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=\"L\u00e4gg till i varukorgen: \u201dPortable balancer &amp; Vibration analyzer Balanset-1A\u201d\" rel=\"nofollow\" data-success_message=\"&quot;Portable balancer &amp; Vibration analyzer Balanset-1A&quot; har lagts till i din varukorg\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">L\u00e4gg till i varukorg<\/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\/sv\/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\/sv\/product\/vibration-sensor\/\" title=\"Vibrationssensor\">\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 vibrationssensor - n\u00e4rbild\" 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\/sv\/product-category\/parts\/\" rel=\"tag\">Delar<\/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\/sv\/product\/vibration-sensor\/\" title=\"Vibrationssensor\">Vibrationssensor<\/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> + moms (om till\u00e4mpligt)<\/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=\"\/sv\/wp-json\/wp\/v2\/glossary\/207?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=\"L\u00e4gg till i varukorg\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"L\u00e4gg till i varukorg\" 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=\"\/sv\/wp-json\/wp\/v2\/glossary\/207?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=\"L\u00e4gg till i varukorgen: \u201dVibration sensor\u201d\" rel=\"nofollow\" data-success_message=\"&quot;Vibration sensor&quot; har lagts till i din varukorg\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">L\u00e4gg till i varukorg<\/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\/sv\/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\/sv\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optisk sensor (lasertakometer)\">\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=\"Optisk sensor (lasertakometer)\" 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\/sv\/product-category\/parts\/\" rel=\"tag\">Delar<\/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\/sv\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optisk sensor (lasertakometer)\">Optisk sensor (lasertakometer)<\/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> + moms (om till\u00e4mpligt)<\/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=\"\/sv\/wp-json\/wp\/v2\/glossary\/207?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=\"L\u00e4gg till i varukorg\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"L\u00e4gg till i varukorg\" 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=\"\/sv\/wp-json\/wp\/v2\/glossary\/207?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=\"L\u00e4gg till i varukorgen: \u201dOptical Sensor (Laser Tachometer)\u201d\" rel=\"nofollow\" data-success_message=\"&quot;Optical Sensor (Laser Tachometer)&quot; har lagts till i din varukorg\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">L\u00e4gg till i varukorg<\/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\/sv\/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\/sv\/product\/balanset-4\/\" title=\"Balanset-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 rotorbalanseringssats: b\u00e4rv\u00e4ska, flerkanalig signalkonditionerare, handh\u00e5llen analysator, magnetisk bas, vibrationssensorer och spiralformade kablar.\" 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\/sv\/product-category\/devices\/\" rel=\"tag\">Enheter<\/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\/sv\/product\/balanset-4\/\" title=\"Balanset-4\">Balanset-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> + moms (om till\u00e4mpligt)<\/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=\"\/sv\/wp-json\/wp\/v2\/glossary\/207?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=\"L\u00e4gg till i varukorg\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"L\u00e4gg till i varukorg\" 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=\"\/sv\/wp-json\/wp\/v2\/glossary\/207?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=\"L\u00e4gg till i varukorgen: \u201dBalanset-4\u201d\" rel=\"nofollow\" data-success_message=\"&quot;Balanset-4&quot; har lagts till i din varukorg\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">L\u00e4gg till i varukorg<\/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\/sv\/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\/sv\/product\/magnet-stand\/\" title=\"Magnetiskt stativ Insize-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=\"Magnetf\u00e4ste.\" 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\/sv\/product-category\/parts\/\" rel=\"tag\">Delar<\/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\/sv\/product\/magnet-stand\/\" title=\"Magnetiskt stativ Insize-60-kgf\">Magnetiskt stativ Insize-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> + moms (om till\u00e4mpligt)<\/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=\"\/sv\/wp-json\/wp\/v2\/glossary\/207?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=\"L\u00e4gg till i varukorg\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"L\u00e4gg till i varukorg\" 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=\"\/sv\/wp-json\/wp\/v2\/glossary\/207?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=\"L\u00e4gg till i varukorgen: \u201dMagnetic Stand Insize-60-kgf\u201d\" rel=\"nofollow\" data-success_message=\"&quot;Magnetic Stand Insize-60-kgf&quot; har lagts till i din varukorg\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">L\u00e4gg till i varukorg<\/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\/sv\/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\/sv\/product\/reflective-tape\/\" title=\"Reflekterande tejp\">\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=\"Reflekterande tejp\" 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\/sv\/product-category\/parts\/\" rel=\"tag\">Delar<\/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\/sv\/product\/reflective-tape\/\" title=\"Reflekterande tejp\">Reflekterande tejp<\/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> + moms (om till\u00e4mpligt)<\/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=\"\/sv\/wp-json\/wp\/v2\/glossary\/207?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=\"L\u00e4gg till i varukorg\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"L\u00e4gg till i varukorg\" 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=\"\/sv\/wp-json\/wp\/v2\/glossary\/207?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=\"L\u00e4gg till i varukorgen: \u201dReflective tape\u201d\" rel=\"nofollow\" data-success_message=\"&quot;Reflective tape&quot; har lagts till i din varukorg\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">L\u00e4gg till i varukorg<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_2329\" 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\/sv\/product\/dynamic-balancer-balanset-1a\/\" 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\/sv\/product\/dynamic-balancer-balanset-1a\/\" title=\"Dynamisk balanserare &quot;Balanset-1A&quot; OEM\">\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\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A-kit, inneh\u00e5ll med gr\u00e4nssnittsenhet, givare, varvr\u00e4knare och tillbeh\u00f6r\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-1024x683.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-1536x1024.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-2048x1366.webp 2048w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-e1732998877834.webp 708w\" 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\/sv\/product-category\/devices\/\" rel=\"tag\">Enheter<\/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\/sv\/product\/dynamic-balancer-balanset-1a\/\" title=\"Dynamisk balanserare &quot;Balanset-1A&quot; OEM\">Dynamisk balanserare \"Balanset-1A\" 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> + moms (om till\u00e4mpligt)<\/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=\"\/sv\/wp-json\/wp\/v2\/glossary\/207?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 btn-simple btn-default\" title=\"L\u00e4gg till i varukorg\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"L\u00e4gg till i varukorg\" 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=\"\/sv\/wp-json\/wp\/v2\/glossary\/207?add-to-cart=4193\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_4193\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"4193\" data-product_sku=\"BS-1OEM\" aria-label=\"L\u00e4gg till i varukorgen: \u201dDynamic balancer \u201cBalanset-1A\u201d OEM\u201d\" rel=\"nofollow\" data-success_message=\"&quot;Dynamic balancer \u201cBalanset-1A\u201d OEM&quot; har lagts till i din varukorg\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">L\u00e4gg till i varukorg<\/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>Recirkulation<\/strong> \u00e4r en fl\u00f6desinstabilitet som uppst\u00e5r i centrifugalpumpar och fl\u00e4ktar n\u00e4r de k\u00f6rs med fl\u00f6den som ligger l\u00e5ngt under deras konstruktionspunkt \u2013 den b\u00e4sta verkningspunkten, eller BEP. Vid l\u00e5gt fl\u00f6de v\u00e4nder en del av v\u00e4tskan riktning och str\u00f6mmar bak\u00e5t fr\u00e5n utloppsomr\u00e5det mot insuget, vilket bildar instabila \u00e5tercirkulationsm\u00f6nster vid pumphjulets inlopp eller utlopp. Resultatet blir l\u00e5gfrekventa <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/vibration\/\">vibrationer<\/a> pulsering (vanligtvis 0,2-0,8 g\u00e5nger varvtalet och d\u00e4rf\u00f6r <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/sub-synchronous\/\">subsynkron<\/a>), buller, effektivitetsf\u00f6rlust och \u2013 i sv\u00e5ra fall \u2013 allvarliga mekaniska skador till f\u00f6ljd av cyklisk belastning, <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/cavitation\/\">kavitation<\/a> och uppv\u00e4rmning. Det r\u00e4knas som ett av de mest skadliga s\u00e4tten att anv\u00e4nda en pump p\u00e5, och att undvika detta \u00e4r avg\u00f6rande f\u00f6r <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/centrifugal-pump-defects\/\">pumpens tillf\u00f6rlitlighet<\/a>.<\/p>\n<h2>1. Definition: En hydraulisk instabilitet vid l\u00e5gt fl\u00f6de<\/h2>\n<p>Ett l\u00f6phjul \u00e4r konstruerat s\u00e5 att v\u00e4tskan str\u00f6mmar in och ut mellan skovlarna i specifika vinklar vid BEP. Om fl\u00f6det stryps till en niv\u00e5 l\u00e5ngt under denna punkt st\u00e4mmer hastighetstrianglarna inte l\u00e4ngre \u00f6verens med skovlarnas geometri: infallsvinkeln blir helt fel, str\u00f6mningen lossnar fr\u00e5n skovlarna och v\u00e4tska som l\u00f6phjulet redan har satt i r\u00f6relse str\u00f6mmar tillbaka. Dessa bak\u00e5triktade, virvlande str\u00f6mmar utg\u00f6r \u00e5tercirkulationen. Eftersom det instabila <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/hydraulic-forces\/\">hydrauliska krafter<\/a> de kan generera enorma krafter kan \u00e5tercirkulation leda till lagerskador, skador p\u00e5 t\u00e4tningar och axelskador <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/fatigue\/\">tr\u00f6tthet<\/a> och till och med att sj\u00e4lva pumphjulet g\u00e5r s\u00f6nder. Att f\u00f6rst\u00e5 och f\u00f6rebygga detta \u00e4r avg\u00f6rande f\u00f6r pumpens livsl\u00e4ngd.<\/p>\n<h2>2. Olika typer av \u00e5tercirkulation<\/h2>\n<h3>\u00c5tercirkulation p\u00e5 sugsidan<\/h3>\n<p>Uppst\u00e5r vid pumphjulets inlopp (sugsidan):<\/p>\n<ul>\n<li><strong>Mekanism:<\/strong> Vid l\u00e5gt fl\u00f6de kommer v\u00e4tskan in i l\u00f6phjuls\u00f6gat med fel str\u00f6mningsvinkel.<\/li>\n<li><strong>Separation:<\/strong> str\u00f6mningen lossnar fr\u00e5n skovlarnas sugytor.<\/li>\n<li><strong>Omv\u00e4nt fl\u00f6de:<\/strong> den separerade v\u00e4tskan str\u00f6mmar bak\u00e5t ut ur l\u00f6phjuls\u00f6gat.<\/li>\n<li><strong>B\u00f6rjan:<\/strong> vanligtvis vid 60\u201370 % av BEP-fl\u00f6det.<\/li>\n<li><strong>Plats:<\/strong> koncentrerade n\u00e4ra l\u00f6phjulets t\u00e4ckskivor.<\/li>\n<\/ul>\n<h3>\u00c5tercirkulation p\u00e5 trycksidan<\/h3>\n<p>Uppst\u00e5r vid pumphjulets utlopp (utloppet):<\/p>\n<ul>\n<li><strong>Mekanism:<\/strong> H\u00f6gtrycksutloppsv\u00e4tska fl\u00f6dar bak\u00e5t in i impellerns periferi<\/li>\n<li><strong>V\u00e4g:<\/strong> genom spelrum s\u00e5som slitringar och sidospel.<\/li>\n<li><strong>Blandning:<\/strong> den \u00e5tercirkulerade str\u00f6mmen blandas med huvudfl\u00f6det, vilket ger upphov till <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/flow-turbulence\/\">turbulens<\/a>.<\/li>\n<li><strong>B\u00f6rjan:<\/strong> vanligtvis vid 40\u201360 % av BEP-fl\u00f6det.<\/li>\n<li><strong>Str\u00e4nghet:<\/strong> Generellt mer skadligt \u00e4n sugcirkulation<\/li>\n<\/ul>\n<h3>Kombinerad \u00e5tercirkulation<\/h3>\n<ul>\n<li>B\u00e5de \u00e5tercirkulation p\u00e5 sugsidan och p\u00e5 trycksidan f\u00f6rekommer samtidigt.<\/li>\n<li>Intr\u00e4ffar vid mycket l\u00e5ga fl\u00f6den, under cirka 40 % av BEP.<\/li>\n<li>Orsakar de kraftigaste vibrationerna och medf\u00f6r den st\u00f6rsta risken f\u00f6r skador.<\/li>\n<li>Detta b\u00f6r undvikas genom skydd mot f\u00f6r l\u00e5gt fl\u00f6de.<\/li>\n<\/ul>\n<h2>3. Vibrationssignatur<\/h2>\n<h3>Karakt\u00e4ristiskt m\u00f6nster<\/h3>\n<ul>\n<li><strong>Frekvens:<\/strong> subsynkron, vanligtvis 0,2-0,8 g\u00e5nger varvtalet.<\/li>\n<li><strong>Exempel:<\/strong> en pump med 1750 varv per minut som uppvisar pulseringar p\u00e5 10\u201320 Hz.<\/li>\n<li><strong>Amplitud:<\/strong> kan uppg\u00e5 till 2\u20135 g\u00e5nger den normala driftsvibrationen.<\/li>\n<li><strong>Instabil:<\/strong> b\u00e5de frekvensen och amplituden varierar ist\u00e4llet f\u00f6r att h\u00e5lla sig konstanta.<\/li>\n<li><strong>Slumpm\u00e4ssig komponent:<\/strong> en bredbands\u00f6kning fr\u00e5n turbulensen ligger ovanp\u00e5.<\/li>\n<\/ul>\n<p>Det \u00e4r just denna sv\u00e4ngande, icke-synkrona karakt\u00e4r som skiljer \u00e5tercirkulationen fr\u00e5n den konstanta 1\u00d7-frekvensen hos <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/unbalance\/\">obalans<\/a> och toppv\u00e4rdet f\u00f6r bladvarvtalet p\u00e5 <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/vane-passing-frequency\/\">skovelpasseringsfrekvens<\/a>; f\u00f6r att f\u00e5nga det kr\u00e4vs det oftast att man unders\u00f6ker b\u00e5de <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/spectrum\/\">spektrum<\/a> och <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/time-waveform\/\">tidsv\u00e5gform<\/a>.<\/p>\n<h3>Fl\u00f6desberoende<\/h3>\n<ul>\n<li><strong>H\u00f6gt fl\u00f6de:<\/strong> ingen \u00e5tercirkulation, l\u00e5g vibration.<\/li>\n<li><strong>M\u00e5ttligt fl\u00f6de (80-100 % av BEP):<\/strong> minimal \u00e5tercirkulation, acceptabla vibrationer.<\/li>\n<li><strong>L\u00e5gt fl\u00f6de (50\u201370 % av BEP):<\/strong> \u00e5tercirkulation p\u00e5 sugsidan b\u00f6rjar och vibrationerna \u00f6kar.<\/li>\n<li><strong>Mycket l\u00e5gt fl\u00f6de (&lt; 50 % av BEP):<\/strong> kraftig \u00e5tercirkulation och mycket h\u00f6ga vibrationer.<\/li>\n<li><strong>Avst\u00e4ngning:<\/strong> maximal \u00e5tercirkulation, maximala vibrationer och snabbast skadeutveckling.<\/li>\n<\/ul>\n<h3>Ytterligare indikatorer<\/h3>\n<ul>\n<li>En h\u00f6g <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/axial-vibration\/\">axiell vibration<\/a> komponent.<\/li>\n<li>\u00d6kat buller \u2013 ett d\u00e5nande eller mullrande ljud.<\/li>\n<li>Prestandaf\u00f6rlust, d\u00e4r uppfordringsh\u00f6jd och fl\u00f6de faller under kurvan.<\/li>\n<li>Temperatur\u00f6kning till f\u00f6ljd av att hydrauliska f\u00f6rluster \u00f6verf\u00f6rs till v\u00e4tskan.<\/li>\n<\/ul>\n<h2>4. Konsekvenser och skador<\/h2>\n<h3>Omedelbara effekter<\/h3>\n<ul>\n<li><strong>Kraftiga vibrationer:<\/strong> kan \u00f6verskrida larmgr\u00e4nserna inom n\u00e5gra minuter.<\/li>\n<li><strong>Buller:<\/strong> ett h\u00f6gt, d\u00e5nande vr\u00e5l.<\/li>\n<li><strong>Effektivitetsf\u00f6rlust:<\/strong> h\u00f6gt effektuttag f\u00f6r det fl\u00f6de som faktiskt levereras.<\/li>\n<li><strong>Uppv\u00e4rmning:<\/strong> hydrauliska f\u00f6rluster som omvandlas till v\u00e4rme i pumphuset.<\/li>\n<\/ul>\n<h3>Mekanisk skada<\/h3>\n<ul>\n<li><strong>Lagerhaveri:<\/strong> h\u00f6ga cykliska belastningar p\u00e5skyndar lagerslitage <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/bearing-wear\/\">slitage<\/a>.<\/li>\n<li><strong>Skador p\u00e5 t\u00e4tningar:<\/strong> vibrationer och tryckpulseringar f\u00f6rst\u00f6r <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/seal-defects\/\">mekaniska t\u00e4tningar<\/a>.<\/li>\n<li><strong>Utmattning av axeln:<\/strong> v\u00e4xlande b\u00f6jsp\u00e4nning till f\u00f6ljd av de instabila hydrauliska krafterna.<\/li>\n<li><strong>Skador p\u00e5 impellern:<\/strong> skovel <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/impeller-defects\/\">tr\u00f6tthetssprickor<\/a> p\u00e5 grund av cyklisk belastning.<\/li>\n<\/ul>\n<h3>Hydrauliska skador<\/h3>\n<ul>\n<li><strong>Kavitation:<\/strong> \u00c5tercirkulationszoner \u00e4r utsatta f\u00f6r kavitation n\u00e4r det lokala trycket sjunker under \u00e5ngtrycket.<\/li>\n<li><strong>Erosion:<\/strong> Ett \u00e5tercirkulerande fl\u00f6de med h\u00f6g hastighet sliter p\u00e5 ytorna.<\/li>\n<li><strong>Virvelkavitation:<\/strong> virvlarna inom \u00e5tercirkulationszonerna bildar kavitationsbubblor i sina l\u00e5gtrycksk\u00e4rnor.<\/li>\n<\/ul>\n<h2>5. Uppt\u00e4ckt och diagnos<\/h2>\n<h3>Vibrationsanalys<\/h3>\n<ul>\n<li>Leta efter subsynkrona komponenter i frekvensbandet 0,2\u20130,8\u00d7.<\/li>\n<li>Testa vid flera olika fl\u00f6den f\u00f6r att kartl\u00e4gga beteendet.<\/li>\n<li>Best\u00e4m det fl\u00f6de vid vilket pulseringarna b\u00f6rjar \u2013 det vill s\u00e4ga n\u00e4r \u00e5tercirkulationen s\u00e4tter in.<\/li>\n<li>J\u00e4mf\u00f6r resultaten med prognoserna i pumpens prestandakurva.<\/li>\n<\/ul>\n<h3>Prestandatestning<\/h3>\n<ul>\n<li>M\u00e4t den faktiska uppfordringsh\u00f6jd-fl\u00f6deskurvan.<\/li>\n<li>J\u00e4mf\u00f6r det med konstruktionskurvan.<\/li>\n<li>En avvikelse vid l\u00e5gt fl\u00f6de tyder p\u00e5 \u00e5tercirkulation.<\/li>\n<li>Effektf\u00f6rbrukning som \u00e4r h\u00f6gre \u00e4n vad kurvan f\u00f6ruts\u00e4ger \u00e4r ytterligare ett tecken.<\/li>\n<\/ul>\n<h3>Akustisk \u00f6vervakning<\/h3>\n<ul>\n<li>Ett karakteristiskt, d\u00e5nande ljud.<\/li>\n<li>En \u00f6kning av bredbandsbruset.<\/li>\n<li>Ofta h\u00f6rbart och k\u00e4nnbart vid pumphuset.<\/li>\n<\/ul>\n<h2>6. F\u00f6rebyggande och mot\u00e5tg\u00e4rder<\/h2>\n<h3>Driftsstrategier<\/h3>\n<h4>Skydd mot f\u00f6r l\u00e5gt fl\u00f6de<\/h4>\n<ul>\n<li>Installera en automatisk recirkulationsledning f\u00f6r minimifl\u00f6de.<\/li>\n<li>En ventil \u00f6ppnas s\u00e5 snart fl\u00f6det sjunker under det s\u00e4kra minimiv\u00e4rdet (vanligtvis 60\u201370 % av BEP).<\/li>\n<li>Den \u00e5terf\u00f6r fl\u00f6de fr\u00e5n trycksidan till sugsidan eller till en tank.<\/li>\n<li>Detta g\u00f6r att pumpen inte hamnar i \u00e5tercirkulationszonen.<\/li>\n<\/ul>\n<h4>Reglering av driftpunkten<\/h4>\n<ul>\n<li>Undvik att k\u00f6ra med ett fl\u00f6de som understiger det l\u00e4gsta kontinuerliga stabila fl\u00f6det.<\/li>\n<li>Anv\u00e4nd en frekvensomriktare f\u00f6r att anpassa pumpen efter behovet och dra nytta av <a href=\"https:\/\/vibromera.eu\/sv\/calculators\/affinity-laws-calculator\/\">lagar om sl\u00e4ktskap<\/a> f\u00f6r att h\u00e5lla sig n\u00e4ra BEP \u00f6ver ett brett driftomr\u00e5de.<\/li>\n<li>Anv\u00e4nd hellre flera mindre pumpar \u00e4n en stor pump f\u00f6r att uppn\u00e5 b\u00e4ttre regleromf\u00e5ng.<\/li>\n<li>Koppla in och ur parallella pumpar efterhand som behovet f\u00f6r\u00e4ndras.<\/li>\n<\/ul>\n<h3>Designl\u00f6sningar<\/h3>\n<ul>\n<li><strong>Inducerare:<\/strong> ett axiellt inloppssteg f\u00f6r att stabilisera sugfl\u00f6det.<\/li>\n<li><strong>L\u00f6phjul f\u00f6r l\u00e5ga fl\u00f6den:<\/strong> specialkonstruktioner avsedda f\u00f6r drift med l\u00e5gt fl\u00f6de.<\/li>\n<li><strong>R\u00e4tt storlek:<\/strong> V\u00e4lj inte en f\u00f6r stor pump, eftersom det leder till att den st\u00e4ndigt g\u00e5r med f\u00f6r l\u00e5gt fl\u00f6de.<\/li>\n<li><strong>Bredare driftomr\u00e5de:<\/strong> V\u00e4lj pumpar med plana kurvor som klarar av fl\u00f6desvariationer.<\/li>\n<\/ul>\n<h3>Systemdesign<\/h3>\n<ul>\n<li>Utforma systemet s\u00e5 att pumpen arbetar n\u00e4ra BEP.<\/li>\n<li>Se till att NPSH-marginalen \u00e4r tillr\u00e4cklig f\u00f6r att begr\u00e4nsa kavitationen i \u00e5tercirkulationszonerna.<\/li>\n<li>Placera reglerventilerna s\u00e5 att sugstrypningen minimeras.<\/li>\n<li>Inkludera f\u00f6rbikopplings- eller \u00e5tercirkulationssystem f\u00f6r att s\u00e4kerst\u00e4lla ett minimifl\u00f6de.<\/li>\n<\/ul>\n<h2>7. Branschstandarder och riktlinjer<\/h2>\n<h3>Minsta kontinuerliga fl\u00f6de<\/h3>\n<ul>\n<li><strong>API 610:<\/strong> Anger minsta kontinuerliga stabila fl\u00f6de f\u00f6r centrifugalpumpar<\/li>\n<li><strong>Typiska v\u00e4rden:<\/strong> 60\u201370 % av BEP-fl\u00f6det f\u00f6r radiella pumpar, 70\u201380 % f\u00f6r blandfl\u00f6deskonstruktioner.<\/li>\n<li><strong>Termiska aspekter:<\/strong> Minimifl\u00f6det begr\u00e4nsas ocks\u00e5 av den temperatur\u00f6kning som v\u00e4tskan t\u00e5l vid l\u00e5gt fl\u00f6de.<\/li>\n<\/ul>\n<h3>Prestandatestning<\/h3>\n<ul>\n<li>Fabriksf\u00f6rs\u00f6k anv\u00e4nds f\u00f6r att fastst\u00e4lla vid vilken punkt \u00e5tercirkulationen b\u00f6rjar.<\/li>\n<li>Prestandatester i f\u00e4lt bekr\u00e4ftar detta i det installerade systemet.<\/li>\n<li>Godk\u00e4nnandekriterierna anger den till\u00e5tna vibrationen vid minimifl\u00f6de, ofta uttryckt i f\u00f6rh\u00e5llande till <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/iso-20816-1\/\">ISO 20816<\/a> sv\u00e5righetszoner.<\/li>\n<\/ul>\n<p>Eftersom \u00e5tercirkulation, obalans, skovelpassageeffekter och kavitation alla kan \u00f6ka pumpvibrationerna, \u00e4r det praktiska diagnostiska steget att m\u00e4ta spektrumet vid flera olika fl\u00f6den och se vilken komponent som f\u00f6ljer fl\u00f6det. En b\u00e4rbar tv\u00e5kanalsanalysator, s\u00e5som <a href=\"https:\/\/vibromera.eu\/sv\/produkt\/balanset-1\/\">Balanset-1A<\/a> registrerar den subsynkrona pulseringen och dess fl\u00f6desberoende direkt vid pumpen, vilket hj\u00e4lper till att bekr\u00e4fta att det r\u00f6r sig om \u00e5tercirkulation snarare \u00e4n ett rotorfel \u2014 och d\u00e4r den f\u00f6rh\u00f6jda vibrationen visar sig vara 1\u00d7 <a href=\"https:\/\/vibromera.eu\/sv\/glossary\/unbalance\/\">obalans<\/a> i pumphjulet kan teknikern balansera det p\u00e5 plats utan att demontera pumpen. F\u00f6r att ringa in de relevanta frekvenserna innan du b\u00f6rjar kan en <a href=\"https:\/\/vibromera.eu\/sv\/calculators\/pump-cavitation-frequency\/\">ber\u00e4kningsverktyg f\u00f6r pumpkavitationsfrekvens<\/a> och en <a href=\"https:\/\/vibromera.eu\/sv\/calculators\/blade-pass-frequency\/\">ber\u00e4kningsverktyg f\u00f6r skovelpassagefrekvens<\/a> markerar var kavitationsljud och toppar vid skovelpassagefrekvensen b\u00f6r upptr\u00e4da, s\u00e5 att det vandrande subsynkrona \u00e5tercirkulationsbandet framtr\u00e4der tydligt.<\/p>\n<p>\u00c5tercirkulation h\u00f6r till de tuffaste driftsf\u00f6rh\u00e5llandena som en centrifugalpump kan uts\u00e4ttas f\u00f6r. Dess karakteristiska sub-synkrona vibrationsm\u00f6nster, stora pulsationsamplituder och ben\u00e4genhet f\u00f6r snabba mekaniska skador g\u00f6r det avg\u00f6rande att f\u00f6rst\u00e5 under vilka f\u00f6rh\u00e5llanden detta uppst\u00e5r, installera skydd mot f\u00f6r l\u00e5gt fl\u00f6de och undvika l\u00e5ngvarig drift med l\u00e5gt fl\u00f6de \u2013 vilket \u00e4r nyckeln till pumpens tillf\u00f6rlitlighet och livsl\u00e4ngd i industriell drift.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/sv\/glossary\/\">\u2190 Tillbaka till huvudregistret<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>L\u00e4r dig om recirkulation i pumpar, fl\u00f6desomv\u00e4ndning och instabilitet vid l\u00e5ga fl\u00f6deshastigheter som orsakar subsynkrona vibrationspulsationer, effektivitetsf\u00f6rlust och potentiella skador.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[109,110],"tags":[],"class_list":["post-207","glossary","type-glossary","status-publish","hentry","category-glossary","category-vibration-diagnostics"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/glossary\/207","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/glossary\/207\/revisions"}],"predecessor-version":[{"id":101401,"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/glossary\/207\/revisions\/101401"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/media?parent=207"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/categories?post=207"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/sv\/wp-json\/wp\/v2\/tags?post=207"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}