{"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\/nb\/glossary\/recirculation\/","title":{"rendered":"Hva er resirkulering? Ustabilitet i lavstr\u00f8mspumpen"},"content":{"rendered":"<h1>Forst\u00e5 resirkulering i pumper<\/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\/nb\/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\/nb\/product\/balanset-1\/\" title=\"B\u00e6rbart balanseapparat og vibrasjonsanalysator 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 sett med b\u00e6rbart balanseapparat og vibrasjonsanalysator\" 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\/nb\/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\/nb\/product\/balanset-1\/\" title=\"B\u00e6rbart balanseapparat og vibrasjonsanalysator Balanset-1A\">B\u00e6rbart balanseapparat og vibrasjonsanalysator 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> + MVA (hvis aktuelt)<\/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=\"\/nb\/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=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" 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=\"\/nb\/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=\"Legg i handlekurv: \u00abPortable balancer &amp; Vibration analyzer Balanset-1A\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abPortable balancer &amp; Vibration analyzer Balanset-1A\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/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\/nb\/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\/nb\/product\/vibration-sensor\/\" title=\"Vibrasjonssensor\">\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 vibrasjonssensor i n\u00e6rbilde\" 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\/nb\/product-category\/parts\/\" rel=\"tag\">Deler<\/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\/nb\/product\/vibration-sensor\/\" title=\"Vibrasjonssensor\">Vibrasjonssensor<\/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> + MVA (hvis aktuelt)<\/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=\"\/nb\/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=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" 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=\"\/nb\/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=\"Legg i handlekurv: \u00abVibration sensor\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abVibration sensor\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/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\/nb\/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\/nb\/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\/nb\/product-category\/parts\/\" rel=\"tag\">Deler<\/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\/nb\/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> + MVA (hvis aktuelt)<\/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=\"\/nb\/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=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" 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=\"\/nb\/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=\"Legg i handlekurv: \u00abOptical Sensor (Laser Tachometer)\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abOptical Sensor (Laser Tachometer)\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/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\/nb\/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\/nb\/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 rotorbalanseringssett: b\u00e6reveske, flerkanals signalbehandler, h\u00e5ndholdt analysator, magnetisk base, vibrasjonssensorer og spiralkabler.\" 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\/nb\/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\/nb\/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> + MVA (hvis aktuelt)<\/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=\"\/nb\/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=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" 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=\"\/nb\/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=\"Legg i handlekurv: \u00abBalanset-4\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abBalanset-4\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/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\/nb\/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\/nb\/product\/magnet-stand\/\" title=\"Magnetisk 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=\"Magnetisk base.\" 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\/nb\/product-category\/parts\/\" rel=\"tag\">Deler<\/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\/nb\/product\/magnet-stand\/\" title=\"Magnetisk stativ Insize-60-kgf\">Magnetisk 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> + MVA (hvis aktuelt)<\/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=\"\/nb\/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=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" 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class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/nb\/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\/nb\/product\/reflective-tape\/\" title=\"Refleksb\u00e5nd\">\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=\"Refleksb\u00e5nd\" 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\/nb\/product-category\/parts\/\" rel=\"tag\">Deler<\/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\/nb\/product\/reflective-tape\/\" title=\"Refleksb\u00e5nd\">Refleksb\u00e5nd<\/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> + MVA (hvis aktuelt)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div 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tape\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/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\/nb\/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\/nb\/product\/dynamic-balancer-balanset-1a\/\" title=\"Dynamisk balanseringsapparat &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-settet inneholder grensesnittenhet, sensorer, turteller og tilbeh\u00f8r\" 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\/nb\/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\/nb\/product\/dynamic-balancer-balanset-1a\/\" title=\"Dynamisk balanseringsapparat &quot;Balanset-1A&quot; OEM\">Dynamisk balanseringsapparat \"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> + MVA (hvis aktuelt)<\/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=\"\/nb\/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=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" 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=\"\/nb\/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=\"Legg i handlekurv: \u00abDynamic balancer \u201cBalanset-1A\u201d OEM\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abDynamic balancer \u201cBalanset-1A\u201d OEM\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/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>Resirkulering<\/strong> er en stroemningsustabilitet som oppstaar i sentrifugalpumper og vifter naar de gaar med gjennomstroemninger langt under konstruksjonspunktet - punktet for beste virkningsgrad, eller BEP. Ved lav gjennomstroemning snur en del av vaesken retning, stroemmer bakover fra utloepsomraadet mot sugesiden og danner ustabile resirkulerende moenstre ved loepehjulets innloep eller utloep. Resultatet er lavfrekvent <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/vibration\/\">vibrasjon<\/a> pulsering (vanligvis 0,2-0,8x driftshastigheten og derfor <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/sub-synchronous\/\">subsynkron<\/a>), st\u00f8y, effektivitetstap og \u2013 i alvorlige tilfeller \u2013 alvorlige mekaniske skader som f\u00f8lge av syklisk belastning, <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/cavitation\/\">kavitasjon<\/a> og oppvarming. Dette regnes som en av de mest skadelige m\u00e5tene \u00e5 bruke en pumpe p\u00e5, og det er avgj\u00f8rende \u00e5 unng\u00e5 dette <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/centrifugal-pump-defects\/\">pumpens p\u00e5litelighet<\/a>.<\/p>\n<h2>1. Definisjon: Hydraulisk ustabilitet ved lavt str\u00f8mningsniv\u00e5<\/h2>\n<p>Et loepehjul er konstruert slik at vaesken gaar inn i og forlater skovlene i bestemte vinkler ved BEP. Struper man gjennomstroemningen langt under dette punktet, stemmer ikke lenger hastighetstrianglene med bladgeometrien: innfallsvinkelen blir helt feil, stroemningen loesner fra skovlene, og vaeske som loepehjulet allerede har tilfoert energi, stroemmer bakover. Disse omvendte, virvlende stroemmene er resirkulasjonen. Fordi den ustabile <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/hydraulic-forces\/\">hydrauliske krefter<\/a> de genererer kan v\u00e6re enorme, og resirkulering kan f\u00f8re til lagersvikt, skader p\u00e5 tetninger og aksel <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/fatigue\/\">utmattelse<\/a> og til og med strukturelle skader p\u00e5 selve l\u00f8pehjulet. \u00c5 forst\u00e5 og forebygge dette er avgj\u00f8rende for pumpens levetid.<\/p>\n<h2>2. Typer av resirkulering<\/h2>\n<h3>Sug-resirkulering<\/h3>\n<p>Oppst\u00e5r ved l\u00f8pehjulets innl\u00f8p (sugesiden):<\/p>\n<ul>\n<li><strong>Mekanisme:<\/strong> ved lav gjennomstroemning kommer vaesken som gaar inn i loepehjulsoeyet inn i feil stroemningsvinkel.<\/li>\n<li><strong>Atskillelse:<\/strong> str\u00f8mmen l\u00f8sner fra skovlenes sugesider.<\/li>\n<li><strong>Omvendt stroemning:<\/strong> den separerte vaesken stroemmer bakover ut av loepehjulsoeyet.<\/li>\n<li><strong>Utbrudd:<\/strong> vanligvis ved 60-70 % av BEP-gjennomstroemningen.<\/li>\n<li><strong>Sted:<\/strong> konsentrert i n\u00e6rheten av l\u00f8pehjulets beskyttelsesplater.<\/li>\n<\/ul>\n<h3>Avl\u00f8psresirkulering<\/h3>\n<p>Oppst\u00e5r ved l\u00f8pehjulets utl\u00f8p (utl\u00f8pet):<\/p>\n<ul>\n<li><strong>Mekanisme:<\/strong> H\u00f8ytrykksutl\u00f8psv\u00e6ske str\u00f8mmer bakover inn i l\u00f8pehjulets periferi<\/li>\n<li><strong>Sti:<\/strong> gjennom klaringsspalter som slitasjeringer og sidespalter.<\/li>\n<li><strong>Blanding:<\/strong> den resirkulerte str\u00f8mmen blandes med hovedstr\u00f8mmen, noe som f\u00f8rer til <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/flow-turbulence\/\">turbulens<\/a>.<\/li>\n<li><strong>Utbrudd:<\/strong> vanligvis ved 40-60 % av BEP-gjennomstroemningen.<\/li>\n<li><strong>Alvorlighetsgrad:<\/strong> Generelt mer skadelig enn sugesirkulering<\/li>\n<\/ul>\n<h3>Kombinert resirkulering<\/h3>\n<ul>\n<li>B\u00e5de suge- og utl\u00f8psresirkulering forekommer samtidig.<\/li>\n<li>Oppstaar ved svaert lave gjennomstroemninger, under ca. 40 % av BEP.<\/li>\n<li>For\u00e5rsaker de kraftigste vibrasjonene og utgj\u00f8r den st\u00f8rste risikoen for skader.<\/li>\n<li>Dette boer unngaas ved hjelp av minimumsgjennomstroemningsbeskyttelse.<\/li>\n<\/ul>\n<h2>3. Vibrasjonssignatur<\/h2>\n<h3>Karakteristisk m\u00f8nster<\/h3>\n<ul>\n<li><strong>Frekvens:<\/strong> sub-synkron, vanligvis 0,2\u20130,8 ganger kj\u00f8rehastigheten.<\/li>\n<li><strong>Eksempel:<\/strong> en pumpe med 1750 o\/min som viser pulseringer p\u00e5 10\u201320 Hz.<\/li>\n<li><strong>Amplitude:<\/strong> kan n\u00e5 2\u20135 ganger den normale driftsvibrasjonen.<\/li>\n<li><strong>Ustabil:<\/strong> b\u00e5de frekvensen og amplituden varierer i stedet for \u00e5 holde seg konstante.<\/li>\n<li><strong>Tilfeldig komponent:<\/strong> en bredbaandsoekning fra turbulens kommer i tillegg.<\/li>\n<\/ul>\n<p>Det er nettopp denne uregelmessige, ikke-synkrone karakteren som skiller resirkulering fra den jevne 1\u00d7-rytmen <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/unbalance\/\">ubalanse<\/a> og toppverdien for bladfrekvensen p\u00e5 <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/vane-passing-frequency\/\">vingepasseringsfrekvens<\/a>; for \u00e5 fange det opp m\u00e5 man vanligvis unders\u00f8ke b\u00e5de <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/spectrum\/\">spektrum<\/a> og <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/time-waveform\/\">tidsb\u00f8lgeform<\/a>.<\/p>\n<h3>Flytavhengighet<\/h3>\n<ul>\n<li><strong>H\u00f8y gjennomstr\u00f8mning:<\/strong> ingen resirkulering, lav vibrasjon.<\/li>\n<li><strong>Moderat gjennomstroemning (80-100 % BEP):<\/strong> minimal resirkulering, akseptabel vibrasjon.<\/li>\n<li><strong>Lav gjennomstroemning (50-70 % BEP):<\/strong> Sug-resirkuleringen starter, og vibrasjonen \u00f8ker.<\/li>\n<li><strong>Svaert lav gjennomstroemning (&lt; 50 % BEP):<\/strong> kraftig resirkulering og sv\u00e6rt sterke vibrasjoner.<\/li>\n<li><strong>Avstengning:<\/strong> maksimal resirkulering, maksimal vibrasjon og den raskeste slitasjehastigheten.<\/li>\n<\/ul>\n<h3>Ytterligere indikatorer<\/h3>\n<ul>\n<li>En h\u00f8y <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/axial-vibration\/\">aksial vibrasjon<\/a> komponent.<\/li>\n<li>\u00d8kt st\u00f8y \u2013 br\u00f8lende eller rumlende lyder.<\/li>\n<li>Ytelsestap, der trykk og gjennomstr\u00f8mning faller under kurven.<\/li>\n<li>Temperatur\u00f8kning som f\u00f8lge av at de hydrauliske tapene overf\u00f8res til v\u00e6sken.<\/li>\n<\/ul>\n<h2>4. Konsekvenser og skader<\/h2>\n<h3>Umiddelbare effekter<\/h3>\n<ul>\n<li><strong>Kraftige vibrasjoner:<\/strong> kan overskride alarmgrensene i l\u00f8pet av f\u00e5 minutter.<\/li>\n<li><strong>St\u00f8y:<\/strong> et h\u00f8yt, voldsomt br\u00f8l.<\/li>\n<li><strong>Effektivitetstap:<\/strong> hoeyt effektforbruk i forhold til den faktisk leverte gjennomstroemningen.<\/li>\n<li><strong>Oppvarming:<\/strong> hydrauliske tap som omdannes til varme i pumpehuset.<\/li>\n<\/ul>\n<h3>Mekanisk skade<\/h3>\n<ul>\n<li><strong>Feil p\u00e5 lageret:<\/strong> H\u00f8ye sykliske belastninger sliter p\u00e5 lagrene <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/bearing-wear\/\">slitasje<\/a>.<\/li>\n<li><strong>Forseglingsskader:<\/strong> vibrasjon og trykkpulsering \u00f8delegger <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/seal-defects\/\">mekaniske tetninger<\/a>.<\/li>\n<li><strong>Akseltretthet:<\/strong> vekslende b\u00f8yespenning fra de ustabile hydrauliske kreftene.<\/li>\n<li><strong>Skader p\u00e5 l\u00f8pehjulet:<\/strong> vinge <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/impeller-defects\/\">utmattingssprekker<\/a> fra syklisk belastning.<\/li>\n<\/ul>\n<h3>Hydraulisk skade<\/h3>\n<ul>\n<li><strong>Kavitasjon:<\/strong> Resirkuleringssoner er utsatt for kavitasjon n\u00e5r det lokale trykket faller under damptrykket.<\/li>\n<li><strong>Erosjon:<\/strong> En resirkulerende str\u00f8m med h\u00f8y hastighet sliter p\u00e5 overflatene.<\/li>\n<li><strong>Vortex-kavitasjon:<\/strong> virvelene i resirkuleringssonene danner kavitasjon i sine lavtrykkskjerner.<\/li>\n<\/ul>\n<h2>5. P\u00e5visning og diagnose<\/h2>\n<h3>Vibrasjonsanalyse<\/h3>\n<ul>\n<li>Se etter subsynkrone komponenter i b\u00e5ndet 0,2\u20130,8\u00d7.<\/li>\n<li>Test ved flere str\u00f8mningshastigheter for \u00e5 kartlegge oppf\u00f8rselen.<\/li>\n<li>Bestem str\u00f8mningshastigheten der pulseringene begynner \u2013 tidspunktet for resirkuleringens begynnelse.<\/li>\n<li>Sammenlign resultatene med prognosene i pumpens ytelseskurve.<\/li>\n<\/ul>\n<h3>Ytelsestesting<\/h3>\n<ul>\n<li>M\u00e5l den faktiske trykk-gjennomstr\u00f8mningskurven.<\/li>\n<li>Sammenlign det med designkurven.<\/li>\n<li>Et avvik ved lavt gjennomstr\u00f8mningsniv\u00e5 indikerer resirkulering.<\/li>\n<li>Et str\u00f8mforbruk som er h\u00f8yere enn det kurven forutsier, er et bekreftende bevis.<\/li>\n<\/ul>\n<h3>Akustisk overv\u00e5king<\/h3>\n<ul>\n<li>En karakteristisk, buldrende lyd.<\/li>\n<li>En \u00f8kning i bredb\u00e5ndsst\u00f8y.<\/li>\n<li>Ofte h\u00f8rbar og merkbar ved pumpehuset.<\/li>\n<\/ul>\n<h2>6. Forebygging og avb\u00f8ting<\/h2>\n<h3>Driftsstrategier<\/h3>\n<h4>Beskyttelse mot for lav gjennomstroemning<\/h4>\n<ul>\n<li>Installer en automatisk minimumsgjennomstroemningslinje for resirkulering.<\/li>\n<li>En ventil aapner naar gjennomstroemningen faller under det sikre minimumet (vanligvis 60-70 % av BEP).<\/li>\n<li>Den resirkulerer utloepsstroemmen tilbake til sugesiden eller til en tank.<\/li>\n<li>Dette holder pumpen utenfor resirkuleringssonen.<\/li>\n<\/ul>\n<h4>Styring av driftspunkt<\/h4>\n<ul>\n<li>Unngaa drift under den minste kontinuerlige stabile gjennomstroemningen.<\/li>\n<li>Bruk en frekvensomformer for \u00e5 tilpasse pumpen til behovet, og utnytt dermed <a href=\"https:\/\/vibromera.eu\/nb\/calculators\/affinity-laws-calculator\/\">affinitetslover<\/a> for aa holde driften naer BEP over et bredt arbeidsomraade.<\/li>\n<li>Det er bedre \u00e5 bruke flere mindre pumper enn \u00e9n stor pumpe for \u00e5 oppn\u00e5 bedre reguleringsomr\u00e5de.<\/li>\n<li>Start og stopp parallelle pumper etter hvert som behovet endrer seg.<\/li>\n<\/ul>\n<h3>Designl\u00f8sninger<\/h3>\n<ul>\n<li><strong>Induser:<\/strong> et aksialt innl\u00f8psstadium for \u00e5 stabilisere sugeflyten.<\/li>\n<li><strong>Lavgjennomstroemningsloepehjul:<\/strong> spesialkonstruksjoner beregnet for drift ved lav gjennomstroemning.<\/li>\n<li><strong>Riktig st\u00f8rrelse:<\/strong> Ikke velg en for stor pumpe, for det tvinger fram kronisk drift ved lav gjennomstroemning.<\/li>\n<li><strong>St\u00f8rre driftsomr\u00e5de:<\/strong> Velg pumper med flate kurver som t\u00e5ler variasjoner i gjennomstr\u00f8mningen.<\/li>\n<\/ul>\n<h3>Systemdesign<\/h3>\n<ul>\n<li>Utform systemet slik at pumpen arbeider naer BEP.<\/li>\n<li>S\u00f8rg for tilstrekkelig NPSH-margin for \u00e5 begrense kavitasjon i resirkuleringssonene.<\/li>\n<li>Plasser reguleringsventilene slik at struping paa sugesiden minimeres.<\/li>\n<li>Inkluder bypass- eller resirkuleringssystemer for aa sikre minimumsgjennomstroemning.<\/li>\n<\/ul>\n<h2>7. Bransjestandarder og retningslinjer<\/h2>\n<h3>Minimum kontinuerlig str\u00f8mning<\/h3>\n<ul>\n<li><strong>API 610:<\/strong> Spesifiserer minimum kontinuerlig stabil str\u00f8mning for sentrifugalpumper<\/li>\n<li><strong>Typiske verdier:<\/strong> 60-70 % av BEP-gjennomstroemningen for radialpumper, 70-80 % for blandingsstroemningspumper.<\/li>\n<li><strong>Termiske hensyn:<\/strong> Minimumsgjennomstroemningen begrenses ogsaa av temperaturoekningen vaesken taaler ved lav gjennomstroemning.<\/li>\n<\/ul>\n<h3>Ytelsestesting<\/h3>\n<ul>\n<li>Fabrikkpr\u00f8ver bekrefter tidspunktet for n\u00e5r resirkuleringen starter.<\/li>\n<li>Praktiske ytelsestester bekrefter dette i det installerte systemet.<\/li>\n<li>Godkjenningskriteriene angir tillatt vibrasjon ved minimumsgjennomstroemning, ofte med henvisning til <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/iso-20816-1\/\">ISO 20816<\/a> alvorlighetssoner.<\/li>\n<\/ul>\n<p>Siden resirkulering, ubalanse, virkninger fra vingepassering og kavitasjon alle kan oeke pumpens vibrasjon, bestaar det praktiske diagnostiske trinnet i aa maale spekteret ved flere gjennomstroemninger og se hvilken komponent som foelger gjennomstroemningen. En baerbar tokanalsanalysator som <a href=\"https:\/\/vibromera.eu\/nb\/produkt\/balanset-1\/\">Balanset-1A<\/a> registrerer den subsynkrone pulseringen og dens avhengighet av gjennomstroemningen direkte ved pumpen, noe som bidrar til aa bekrefte resirkulering framfor en rotorfeil - og der den oekte vibrasjonen viser seg aa vaere 1x <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/unbalance\/\">ubalanse<\/a> i loepehjulet, lar teknikeren balansere det paa stedet uten aa demontere pumpen. For aa avgrense de relevante frekvensene foer du begynner, kan en <a href=\"https:\/\/vibromera.eu\/nb\/calculators\/pump-cavitation-frequency\/\">Estimat for kavitasjonsfrekvensen til en pumpe<\/a> og en <a href=\"https:\/\/vibromera.eu\/nb\/calculators\/blade-pass-frequency\/\">Kalkulator for bladpassfrekvens<\/a> marker hvor kavitasjonsst\u00f8y og topper ved vingepassering b\u00f8r oppst\u00e5, slik at det svingende subsynkrone resirkulasjonsb\u00e5ndet fremst\u00e5r tydelig.<\/p>\n<p>Resirkulering er blant de mest krevende driftsforholdene en sentrifugalpumpe kan utsettes for. Den karakteristiske subsynkrone vibrasjonssignaturen, de store pulsasjonsamplitudene og risikoen for raske mekaniske skader gj\u00f8r det avgj\u00f8rende \u00e5 forst\u00e5 n\u00e5r slike forhold oppst\u00e5r, installere beskyttelse mot for lavt gjennomstr\u00f8mningsniv\u00e5 og unng\u00e5 langvarig drift med lavt gjennomstr\u00f8mningsniv\u00e5 \u2013 dette er n\u00f8kkelen til pumpens p\u00e5litelighet og lange levetid i industriell drift.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/nb\/glossary\/\">\u2190 Tilbake til hovedindeksen<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>L\u00e6r om resirkulering i pumper, str\u00f8mningsreversering og ustabilitet ved lave str\u00f8mningshastigheter som for\u00e5rsaker subsynkrone vibrasjonspulseringer, effektivitetstap og potensiell skade.<\/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\/nb\/wp-json\/wp\/v2\/glossary\/207","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/glossary\/207\/revisions"}],"predecessor-version":[{"id":101401,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/glossary\/207\/revisions\/101401"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/media?parent=207"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/categories?post=207"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/tags?post=207"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}