{"id":20607,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/iso-21940-13\/"},"modified":"2026-05-23T23:05:25","modified_gmt":"2026-05-23T23:05:25","slug":"iso-21940-13","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/ml\/glossary\/iso-21940-13\/","title":{"rendered":"ISO 21940-13: In-Situ Balancing Criteria for Medium and Large Rotors"},"content":{"rendered":"<h1>ISO 21940-13: Criteria and Safeguards for In-Situ Balancing of Medium and Large Rotors<\/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\/ml\/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\/ml\/product\/balanset-1\/\" title=\"\u0d2a\u0d4b\u0d7c\u0d1f\u0d4d\u0d1f\u0d2c\u0d3f\u0d7e \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d31\u0d41\u0d02 \u0d35\u0d48\u0d2c\u0d4d\u0d30\u0d47\u0d37\u0d7b \u0d05\u0d28\u0d32\u0d48\u0d38\u0d7c \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-1\u0d0e\">\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 full kit portable balancer and vibration analyzer\" 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\/ml\/product-category\/devices\/\" rel=\"tag\">\u0d09\u0d2a\u0d15\u0d30\u0d23\u0d19\u0d4d\u0d19\u0d7e<\/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\/ml\/product\/balanset-1\/\" title=\"\u0d2a\u0d4b\u0d7c\u0d1f\u0d4d\u0d1f\u0d2c\u0d3f\u0d7e \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d31\u0d41\u0d02 \u0d35\u0d48\u0d2c\u0d4d\u0d30\u0d47\u0d37\u0d7b \u0d05\u0d28\u0d32\u0d48\u0d38\u0d7c \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-1\u0d0e\">\u0d2a\u0d4b\u0d7c\u0d1f\u0d4d\u0d1f\u0d2c\u0d3f\u0d7e \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d31\u0d41\u0d02 \u0d35\u0d48\u0d2c\u0d4d\u0d30\u0d47\u0d37\u0d7b \u0d05\u0d28\u0d32\u0d48\u0d38\u0d7c \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-1\u0d0e<\/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> + VAT (if applicable)<\/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=\"\/ml\/wp-json\/wp\/v2\/glossary\/20607?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=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" 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=\"\/ml\/wp-json\/wp\/v2\/glossary\/20607?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=\"Add to cart: \u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d\" rel=\"nofollow\" data-success_message=\"\u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/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\/ml\/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\/ml\/product\/vibration-sensor\/\" title=\"\u0d35\u0d48\u0d2c\u0d4d\u0d30\u0d47\u0d37\u0d7b \u0d38\u0d46\u0d7b\u0d38\u0d7c\">\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 vibration sensor close-up\" 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\/ml\/product-category\/parts\/\" rel=\"tag\">\u0d2d\u0d3e\u0d17\u0d19\u0d4d\u0d19\u0d7e<\/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\/ml\/product\/vibration-sensor\/\" title=\"\u0d35\u0d48\u0d2c\u0d4d\u0d30\u0d47\u0d37\u0d7b \u0d38\u0d46\u0d7b\u0d38\u0d7c\">\u0d35\u0d48\u0d2c\u0d4d\u0d30\u0d47\u0d37\u0d7b \u0d38\u0d46\u0d7b\u0d38\u0d7c<\/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> + VAT (if applicable)<\/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=\"\/ml\/wp-json\/wp\/v2\/glossary\/20607?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=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" 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=\"\/ml\/wp-json\/wp\/v2\/glossary\/20607?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=\"Add to cart: \u201cVibration sensor\u201d\" rel=\"nofollow\" data-success_message=\"\u201cVibration sensor\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/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\/ml\/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\/ml\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"\u0d12\u0d2a\u0d4d\u0d31\u0d4d\u0d31\u0d3f\u0d15\u0d4d\u0d15\u0d7d \u0d38\u0d46\u0d7b\u0d38\u0d7c (\u0d32\u0d47\u0d38\u0d7c \u0d1f\u0d3e\u0d15\u0d4d\u0d15\u0d4b\u0d2e\u0d40\u0d31\u0d4d\u0d31\u0d7c)\">\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=\"\u0d12\u0d2a\u0d4d\u0d31\u0d4d\u0d31\u0d3f\u0d15\u0d4d\u0d15\u0d7d \u0d38\u0d46\u0d7b\u0d38\u0d7c (\u0d32\u0d47\u0d38\u0d7c \u0d1f\u0d3e\u0d15\u0d4d\u0d15\u0d4b\u0d2e\u0d40\u0d31\u0d4d\u0d31\u0d7c)\" 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\/ml\/product-category\/parts\/\" rel=\"tag\">\u0d2d\u0d3e\u0d17\u0d19\u0d4d\u0d19\u0d7e<\/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\/ml\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"\u0d12\u0d2a\u0d4d\u0d31\u0d4d\u0d31\u0d3f\u0d15\u0d4d\u0d15\u0d7d \u0d38\u0d46\u0d7b\u0d38\u0d7c (\u0d32\u0d47\u0d38\u0d7c \u0d1f\u0d3e\u0d15\u0d4d\u0d15\u0d4b\u0d2e\u0d40\u0d31\u0d4d\u0d31\u0d7c)\">\u0d12\u0d2a\u0d4d\u0d31\u0d4d\u0d31\u0d3f\u0d15\u0d4d\u0d15\u0d7d \u0d38\u0d46\u0d7b\u0d38\u0d7c (\u0d32\u0d47\u0d38\u0d7c \u0d1f\u0d3e\u0d15\u0d4d\u0d15\u0d4b\u0d2e\u0d40\u0d31\u0d4d\u0d31\u0d7c)<\/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> + VAT (if applicable)<\/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=\"\/ml\/wp-json\/wp\/v2\/glossary\/20607?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=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" 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=\"\/ml\/wp-json\/wp\/v2\/glossary\/20607?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=\"Add to cart: \u201cOptical Sensor (Laser Tachometer)\u201d\" rel=\"nofollow\" data-success_message=\"\u201cOptical Sensor (Laser Tachometer)\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/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\/ml\/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\/ml\/product\/balanset-4\/\" title=\"\u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-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 rotor balancing kit: carry case, multi-channel signal conditioner, handheld analyzer, magnetic base, vibration sensors, and coiled cables.\" 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\/ml\/product-category\/devices\/\" rel=\"tag\">\u0d09\u0d2a\u0d15\u0d30\u0d23\u0d19\u0d4d\u0d19\u0d7e<\/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\/ml\/product\/balanset-4\/\" title=\"\u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-4\">\u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-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> + VAT (if applicable)<\/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=\"\/ml\/wp-json\/wp\/v2\/glossary\/20607?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=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" 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=\"\/ml\/wp-json\/wp\/v2\/glossary\/20607?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=\"Add to cart: \u201cBalanset-4\u201d\" rel=\"nofollow\" data-success_message=\"\u201cBalanset-4\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/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\/ml\/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\/ml\/product\/magnet-stand\/\" title=\"\u0d2e\u0d3e\u0d17\u0d4d\u0d28\u0d31\u0d4d\u0d31\u0d3f\u0d15\u0d4d \u0d38\u0d4d\u0d31\u0d4d\u0d31\u0d3e\u0d7b\u0d21\u0d4d \u0d07\u0d7b\u0d38\u0d48\u0d38\u0d4d-60-\u0d15\u0d3f\u0d32\u0d4b\u0d17\u0d4d\u0d30\u0d3e\u0d02\">\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=\"\u0d15\u0d3e\u0d28\u0d4d\u0d24\u0d02 \u0d05\u0d1f\u0d3f\u0d38\u0d4d\u0d25\u0d3e\u0d28\u0d02.\" 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\/ml\/product-category\/parts\/\" rel=\"tag\">\u0d2d\u0d3e\u0d17\u0d19\u0d4d\u0d19\u0d7e<\/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\/ml\/product\/magnet-stand\/\" title=\"\u0d2e\u0d3e\u0d17\u0d4d\u0d28\u0d31\u0d4d\u0d31\u0d3f\u0d15\u0d4d \u0d38\u0d4d\u0d31\u0d4d\u0d31\u0d3e\u0d7b\u0d21\u0d4d \u0d07\u0d7b\u0d38\u0d48\u0d38\u0d4d-60-\u0d15\u0d3f\u0d32\u0d4b\u0d17\u0d4d\u0d30\u0d3e\u0d02\">\u0d2e\u0d3e\u0d17\u0d4d\u0d28\u0d31\u0d4d\u0d31\u0d3f\u0d15\u0d4d \u0d38\u0d4d\u0d31\u0d4d\u0d31\u0d3e\u0d7b\u0d21\u0d4d \u0d07\u0d7b\u0d38\u0d48\u0d38\u0d4d-60-\u0d15\u0d3f\u0d32\u0d4b\u0d17\u0d4d\u0d30\u0d3e\u0d02<\/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> + VAT (if applicable)<\/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=\"\/ml\/wp-json\/wp\/v2\/glossary\/20607?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=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" 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=\"\/ml\/wp-json\/wp\/v2\/glossary\/20607?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=\"Add to cart: \u201cMagnetic Stand Insize-60-kgf\u201d\" rel=\"nofollow\" data-success_message=\"\u201cMagnetic Stand Insize-60-kgf\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/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\/ml\/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\/ml\/product\/reflective-tape\/\" title=\"\u0d2a\u0d4d\u0d30\u0d24\u0d3f\u0d2b\u0d32\u0d3f\u0d2a\u0d4d\u0d2a\u0d3f\u0d15\u0d4d\u0d15\u0d41\u0d28\u0d4d\u0d28 \u0d1f\u0d47\u0d2a\u0d4d\u0d2a\u0d4d\">\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=\"\u0d2a\u0d4d\u0d30\u0d24\u0d3f\u0d2b\u0d32\u0d3f\u0d2a\u0d4d\u0d2a\u0d3f\u0d15\u0d4d\u0d15\u0d41\u0d28\u0d4d\u0d28 \u0d1f\u0d47\u0d2a\u0d4d\u0d2a\u0d4d\" 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\/ml\/product-category\/parts\/\" rel=\"tag\">\u0d2d\u0d3e\u0d17\u0d19\u0d4d\u0d19\u0d7e<\/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\/ml\/product\/reflective-tape\/\" title=\"\u0d2a\u0d4d\u0d30\u0d24\u0d3f\u0d2b\u0d32\u0d3f\u0d2a\u0d4d\u0d2a\u0d3f\u0d15\u0d4d\u0d15\u0d41\u0d28\u0d4d\u0d28 \u0d1f\u0d47\u0d2a\u0d4d\u0d2a\u0d4d\">\u0d2a\u0d4d\u0d30\u0d24\u0d3f\u0d2b\u0d32\u0d3f\u0d2a\u0d4d\u0d2a\u0d3f\u0d15\u0d4d\u0d15\u0d41\u0d28\u0d4d\u0d28 \u0d1f\u0d47\u0d2a\u0d4d\u0d2a\u0d4d<\/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> + VAT (if applicable)<\/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=\"\/ml\/wp-json\/wp\/v2\/glossary\/20607?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=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" 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=\"\/ml\/wp-json\/wp\/v2\/glossary\/20607?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=\"Add to cart: \u201cReflective tape\u201d\" rel=\"nofollow\" data-success_message=\"\u201cReflective tape\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/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\/ml\/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\/ml\/product\/dynamic-balancer-balanset-1a\/\" title=\"\u0d21\u0d48\u0d28\u0d3e\u0d2e\u0d3f\u0d15\u0d4d \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d7c &quot;\u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-1\u0d0e&quot; \u0d12\u0d07\u0d0e\u0d02\">\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 contents with interface unit, sensors, tachometer and accessories\" 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\/ml\/product-category\/devices\/\" rel=\"tag\">\u0d09\u0d2a\u0d15\u0d30\u0d23\u0d19\u0d4d\u0d19\u0d7e<\/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\/ml\/product\/dynamic-balancer-balanset-1a\/\" title=\"\u0d21\u0d48\u0d28\u0d3e\u0d2e\u0d3f\u0d15\u0d4d \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d7c &quot;\u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-1\u0d0e&quot; \u0d12\u0d07\u0d0e\u0d02\">\u0d21\u0d48\u0d28\u0d3e\u0d2e\u0d3f\u0d15\u0d4d \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d7c &quot;\u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-1\u0d0e&quot; \u0d12\u0d07\u0d0e\u0d02<\/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> + VAT (if applicable)<\/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=\"\/ml\/wp-json\/wp\/v2\/glossary\/20607?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=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" 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=\"\/ml\/wp-json\/wp\/v2\/glossary\/20607?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=\"Add to cart: \u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d\" rel=\"nofollow\" data-success_message=\"\u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/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>ISO 21940-13<\/strong> is the specialised international standard governing the practical art of balancing a rotor in its own bearings and support structure, right where the machine lives \u2014 that is, <strong><a href=\"https:\/\/vibromera.eu\/ml\/glossary\/field-balancing\/\">in-situ or field balancing<\/a><\/strong>. Its full title is <em>&#8220;Mechanical vibration \u2014 Rotor balancing \u2014 Part 13: Criteria and safeguards for the in-situ balancing of medium and large rotors.&#8221;<\/em> Where a dedicated <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/balancing-machine\/\">balancing machine<\/a> cannot be used \u2014 because the rotor is too large, too costly to remove, or only misbehaves under real operating conditions \u2014 this part lays out when field balancing is the right choice and how to carry it out safely. It complements the tolerance-focused <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/iso-21940-11\/\">ISO 21940-11<\/a> (rigid rotors) and <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/iso-21940-12\/\">ISO 21940-12<\/a> (flexible rotors) by addressing the realities of working on a running, installed machine.<\/p>\n<h2>1. Scope and Applicability<\/h2>\n<p>The standard provides guidelines and safeguards for the in-situ balancing of medium and large rotors, performed while the rotor remains in its own bearings and support structure \u2014 usually in its final operational location. In practice the same in-situ principles are applied whether the rotor behaves as <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/rigid-rotor\/\">rigid<\/a> \u0d05\u0d25\u0d35\u0d3e <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/flexible-rotor\/\">flexible<\/a> in its installed state: it is the dynamics of the whole <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/rotor-bearing-system\/\">rotor-bearing system<\/a>, not the rotor in isolation, that dictates the approach. The document is written for the technicians, engineers and managers who must decide upon, plan and safely execute a field balancing campaign.<\/p>\n<h2>2. Criteria: When In-Situ Balancing Is Justified<\/h2>\n<p>Field balancing is not the automatic answer to every case of high <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/vibration\/\">vibration<\/a>, and this chapter supplies a decision framework. The standard identifies several scenarios where in-situ balancing is the appropriate course:<\/p>\n<ul>\n<li><strong>Removal is impractical or uneconomic:<\/strong> stripping out a large turbine, generator or fan rotor for a shop balance may be prohibitively expensive or simply not feasible.<\/li>\n<li><strong>Unbalance only appears in service:<\/strong> some unbalance is created by conditions that exist only when the machine runs \u2014 <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/thermal-bow\/\">thermal distortion<\/a>, <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/aerodynamic-forces\/\">aerodynamic forces<\/a>, or process build-up such as debris and product caked onto a fan blade. A shop balance cannot reproduce these.<\/li>\n<li><strong>Final trim after reinstallation:<\/strong> a rotor that was shop-balanced may still need a <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/trim-balance\/\">trim balance<\/a> once reassembled into the machine, to absorb the small shifts that assembly introduces.<\/li>\n<\/ul>\n<p>Critically, the standard insists on confirming first that the high vibration really is caused by <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/unbalance\/\">unbalance<\/a> \u2014 and not by <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/misalignment\/\">misalignment<\/a>, <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/resonance\/\">resonance<\/a>, or <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/looseness\/\">mechanical looseness<\/a>, which mimic or compound an unbalance signature. Adding weights to a misaligned or resonant machine wastes time and can make matters worse.<\/p>\n<h2>3. Procedures and Methodology<\/h2>\n<p>This section is a step-by-step guide to executing the job. It first sets the instrumentation requirements: a multi-channel <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/vibration-analyzer\/\">vibration analyzer<\/a> able to measure amplitude and phase, one or more vibration transducers (shaft-relative proximity probes and\/or casing-mounted <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/accelerometer\/\">accelerometers<\/a>), and a <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/tachometer\/\">phase-reference sensor<\/a> \u2014 typically a photo-tach or <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/laser-tachometer\/\">laser tachometer<\/a> \u2014 to put a once-per-revolution timing mark on the shaft.<\/p>\n<p>Notably, ISO 21940-13 sets out the criteria, instrumentation and safeguards but deliberately does not prescribe the method used to calculate the correction masses from the measured vibration data, leaving the choice of algorithm to the practitioner. In practice the universally used technique is the <strong><a href=\"https:\/\/vibromera.eu\/ml\/glossary\/influence-coefficient\/\">influence coefficient<\/a><\/strong> method: the analyst records the initial vibration vector (amplitude and phase), attaches a known <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/trial-weight\/\">trial weight<\/a> at a known angular position, measures the new &#8220;response&#8221; vector, and then uses <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/vector-addition\/\">vector mathematics<\/a> to compute the mass and angle of the required <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/correction-weight\/\">correction weight<\/a>, applied in a single plane or in two planes as the machine requires. This is exactly the workflow a portable instrument automates: the <a href=\"https:\/\/vibromera.eu\/ml\/product\/balanset-1\/\">\u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-1\u0d0e<\/a>, a two-channel field balancer and analyser, measures 1\u00d7 amplitude and phase in the machine&#8217;s own bearings at operating speed, computes the influence coefficients, and reports the correction mass and angle for each plane \u2014 letting an engineer balance and verify without removing the rotor. A <a href=\"https:\/\/vibromera.eu\/ml\/calculators\/trial-weight-calculator\/\">Trial Weight Calculator<\/a> helps size that first test weight sensibly.<\/p>\n<h2>4. Balance Quality Evaluation \u2014 Vibration, Not Residual Unbalance<\/h2>\n<p>Here the standard draws its most important distinction from shop practice. Shop balancing aims to meet a specific <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/residual-unbalance\/\">residual unbalance<\/a> tolerance derived from a <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/g-grade\/\">G-grade<\/a>. Field balancing has a more pragmatic objective: to reduce the machine&#8217;s <em>operational vibration<\/em> to an acceptable level. Accordingly, acceptance is judged not on residual unbalance in g\u00b7mm but on the final vibration amplitudes. The standard directs that this assessment use the in-service vibration limits defined in the companion standards it references \u2014 <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/iso-7919-1\/\">ISO 7919<\/a> for shaft vibration and <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/iso-10816-1\/\">ISO 10816<\/a> for vibration on non-rotating parts (both since consolidated into the modern <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/iso-20816-1\/\">ISO 20816<\/a> series). The practical aim is to drive the 1\u00d7 <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/running-speed\/\">running-speed<\/a> component down until the machine&#8217;s overall level falls into an acceptable evaluation zone \u2014 Zone A or B \u2014 for long-term operation. You can check a reading against those bands with the <a href=\"https:\/\/vibromera.eu\/ml\/calculators\/vibration-zones-iso20816-1\/\">ISO 20816-1 Vibration Zones calculator<\/a>.<\/p>\n<h2>5. Safeguards and Safety Precautions<\/h2>\n<p>This chapter is arguably the reason the standard exists, because field balancing carries hazards absent from a controlled workshop \u2014 chiefly, deliberately running a machine with added trial weights that could be flung free. It mandates a rigorous, documented safety approach:<\/p>\n<ul>\n<li><strong>Mechanical inspection first:<\/strong> verify before any run that all fasteners are tight and every guard is in place.<\/li>\n<li><strong>Positive weight attachment:<\/strong> trial and correction weights must be securely fixed \u2014 welded, bolted, or seated in dedicated holders \u2014 so they cannot become projectiles.<\/li>\n<li><strong>Controlled access zone:<\/strong> a cordoned exclusion area around the machine during every test run.<\/li>\n<li><strong>Clear communication:<\/strong> unambiguous protocols between the balancing analyst and the machine operator.<\/li>\n<li><strong>Emergency stop:<\/strong> a pre-defined, rehearsed shutdown procedure ready before the first start.<\/li>\n<\/ul>\n<p>This emphasis on safety is paramount: at the speeds and masses of medium and large rotors, a thrown weight or an unguarded coupling can cause serious injury and catastrophic equipment damage.<\/p>\n<h2>6. Key Concepts to Carry Away<\/h2>\n<ul>\n<li><strong>Field vs shop balancing:<\/strong> the standard is entirely about balancing a rotor <em>in the machine<\/em>, correcting the whole assembly in its true operational state, rather than on a balancing machine in a workshop.<\/li>\n<li><strong>Vibration reduction is the goal:<\/strong> success is measured by acceptable in-service vibration per ISO 7919 \/ ISO 10816 (now consolidated as ISO 20816), not by a residual-unbalance figure.<\/li>\n<li><strong>Safety first:<\/strong> the deliberate addition of weights to a running machine makes documented safeguards non-negotiable.<\/li>\n<li><strong>Influence coefficient method:<\/strong> the universal in-situ technique \u2014 measure the initial vector, add a known trial weight, measure the response, and solve with vector maths for the correction.<\/li>\n<\/ul>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/ml\/glossary\/\">\u2190 Back to Main Index<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>An overview of ISO 21940-13, which provides specific criteria, procedures, and safety considerations for performing in-situ (field) balancing on medium and large rotors.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[109,112],"tags":[],"class_list":["post-20607","glossary","type-glossary","status-publish","hentry","category-glossary","category-iso-standards"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/glossary\/20607","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/glossary\/20607\/revisions"}],"predecessor-version":[{"id":101449,"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/glossary\/20607\/revisions\/101449"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/media?parent=20607"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/categories?post=20607"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/tags?post=20607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}