{"id":9176,"date":"2026-04-17T12:45:28","date_gmt":"2026-04-17T12:45:28","guid":{"rendered":"https:\/\/ultrasuonindt.it\/ndt-standards-for-thickness-measurement-en-14127-astm-e797-and-en-15317\/"},"modified":"2026-10-03T13:10:50","modified_gmt":"2026-10-03T13:10:50","slug":"ndt-standards-for-thickness-measurement-en-14127-astm-e797-and-en-15317","status":"publish","type":"post","link":"https:\/\/ultrasuonindt.it\/en\/ndt-standards-for-thickness-measurement-en-14127-astm-e797-and-en-15317\/","title":{"rendered":"NDT standards for thickness measurement: EN 14127, ASTM E797 and EN 15317"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Ultrasonic thickness measurement is governed by a set of international standards that define the requirements for instruments, procedures and personnel qualification. The three most important standards for Dakota NDT instrumentation are <strong>EN 14127<\/strong> (European), <strong>ASTM E797<\/strong> (American) and <strong>EN 15317<\/strong> (European, on flaw detectors). All Dakota gauges of the CX, ZX, MX and CMX series are declared by the manufacturer to comply with these standards.  <\/p>\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"560\" height=\"480\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-famiglia-di-strumenti_di_misura_ad_ultrasuoni_per_controllo_di_spessore_e_corrosione.jpg?resize=560%2C480&#038;ssl=1\" alt=\"Ultrasonic measuring instruments for professional inspections\" class=\"wp-image-179\" style=\"width:600px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-famiglia-di-strumenti_di_misura_ad_ultrasuoni_per_controllo_di_spessore_e_corrosione.jpg?w=560&amp;ssl=1 560w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-famiglia-di-strumenti_di_misura_ad_ultrasuoni_per_controllo_di_spessore_e_corrosione.jpg?resize=300%2C257&amp;ssl=1 300w\" sizes=\"auto, (max-width: 560px) 100vw, 560px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\">EN 14127 \u2014 Ultrasonic thickness measurement<\/h2>\n\n<p class=\"wp-block-paragraph\"><strong>EN 14127 &#8220;Non-destructive testing \u2014 Ultrasonic thickness measurement&#8221;<\/strong> is the harmonised European standard that defines the requirements for ultrasonic measurement of material thickness. The standard covers: <\/p>\n\n<ul class=\"wp-block-list\">\n<li>Principles of ultrasonic thickness measurement by the Pulse-Echo method<\/li>\n<li>Characteristics and classification of measuring instruments<\/li>\n<li>Requirements for probes (transducers) and their accessories<\/li>\n<li>Calibration and adjustment procedures<\/li>\n<li>Factors affecting measurement accuracy<\/li>\n<li>Methods for verifying instrument performance<\/li>\n<\/ul>\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<div class=\"wp-block-cover is-light popmake-4066 popmake-739\" style=\"border-width:1px;min-height:250px;aspect-ratio:unset;\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"250\" class=\"wp-block-cover__image-background wp-image-727 size-full\" alt=\"\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=1200%2C250&#038;ssl=1\" data-object-fit=\"cover\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=300%2C63&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=1024%2C213&amp;ssl=1 1024w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=768%2C160&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim-30 has-background-dim\" style=\"background-color:#d3d6dc\"><\/span><div class=\"wp-block-cover__inner-container is-layout-constrained wp-container-core-cover-is-layout-15701bb7 wp-block-cover-is-layout-constrained\">\n<p class=\"has-text-align-right has-ti-fg-color is-style-default has-luminous-vivid-amber-color has-text-color has-link-color wp-elements-1 wp-block-paragraph\" style=\"font-size:clamp(21.536px, 1.346rem + ((1vw - 3.2px) * 1.374), 35px);\"><strong>Need help choosing the right product?<\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-right is-layout-flex wp-container-core-buttons-is-layout-b507c051 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button popmake-4066 popmake-739\"><a class=\"wp-block-button__link has-ti-accent-color has-cyan-bluish-gray-background-color has-text-color has-background has-link-color wp-element-button\">Contact us<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<p class=\"wp-block-paragraph\">EN 14127 compliance is a typical requirement in European inspection specifications and in NDT personnel qualification procedures to EN ISO 9712. The Dakota <strong>CX, ZX, MX and CMX series<\/strong> gauges are declared by the manufacturer to comply with this standard. <\/p>\n\n<h2 class=\"wp-block-heading\">ASTM E797 \u2014 American standard for thickness measurement<\/h2>\n\n<p class=\"wp-block-paragraph\"><strong>ASTM E797 &#8220;Standard Practice for Measuring Thickness by Manual Ultrasonic Pulse-Echo Contact Method&#8221;<\/strong> is the American standard practice published by the American Society for Testing and Materials. It is widely recognised internationally and cited in the specifications of industries with a North American presence (oil &amp; gas, aerospace, power generation). The standard deals with:  <\/p>\n\n<ul class=\"wp-block-list\">\n<li>Practice for manual thickness measurement by the contact Pulse-Echo method<\/li>\n<li>Selection and verification of the instrumentation<\/li>\n<li>Preparation of the measurement surface<\/li>\n<li>Calibration procedure with reference blocks<\/li>\n<li>Handling of operating variables (temperature, coupling, geometry)<\/li>\n<li>Reporting of measurements<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">All the Dakota gauges mentioned above are also declared compliant with ASTM E797, and are manufactured with calibration traceable to <strong>NIST and MIL-STD-45662A<\/strong>, as stated on the official product data sheets.<\/p>\n\n<h2 class=\"wp-block-heading\">EN 15317 \u2014 Characterisation of thickness gauges<\/h2>\n\n<p class=\"wp-block-paragraph\"><strong>EN 15317 &#8220;Non-destructive testing \u2014 Characterisation of ultrasonic thickness gauges&#8221;<\/strong> is the European standard that defines the methods for characterising and verifying the performance of an ultrasonic thickness gauge. Unlike EN 14127, which defines how to use the instrument, EN 15317 defines <strong>how to qualify the instrument itself<\/strong>. Main contents:  <\/p>\n\n<ul class=\"wp-block-list\">\n<li>Test methods for verifying accuracy, linearity and repeatability<\/li>\n<li>Reference blocks and comparative measurement methods<\/li>\n<li>Acceptance criteria for functional verification<\/li>\n<li>Periodic verification procedure (typically annual)<\/li>\n<li>Documentation and traceability of the qualification<\/li>\n<\/ul>\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1500\" height=\"900\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-dettaglio_display_LCD_per_misure_di_spessore_e_corrosione.jpg?resize=1500%2C900&#038;ssl=1\" alt=\"LCD display for thickness and corrosion measurements\" class=\"wp-image-207\" style=\"width:600px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-dettaglio_display_LCD_per_misure_di_spessore_e_corrosione.jpg?w=1500&amp;ssl=1 1500w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-dettaglio_display_LCD_per_misure_di_spessore_e_corrosione.jpg?resize=300%2C180&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-dettaglio_display_LCD_per_misure_di_spessore_e_corrosione.jpg?resize=1024%2C614&amp;ssl=1 1024w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-dettaglio_display_LCD_per_misure_di_spessore_e_corrosione.jpg?resize=768%2C461&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\">EN 12668-1 \u2014 Standard for flaw detectors<\/h2>\n\n<p class=\"wp-block-paragraph\">For completeness we also mention <strong>EN 12668-1 &#8220;Non-destructive testing \u2014 Characterization and verification of ultrasonic examination equipment \u2014 Part 1: Instruments&#8221;<\/strong>, which is the reference standard for flaw detectors. The Dakota <strong>FX70-DL, FX71-DL and FX81-DL<\/strong> flaw detectors are declared compliant with this standard on the official Dakota NDT data sheets. <\/p>\n\n<h2 class=\"wp-block-heading\">Summary of standards and their application<\/h2>\n\n<figure class=\"wp-block-table alignwide\"><table><thead><tr><th>Standard<\/th><th>Purpose<\/th><th>Application<\/th><th>Compliant Dakota instruments<\/th><\/tr><\/thead><tbody>\n<tr><td>EN 14127<\/td><td>Thickness measurement procedure<\/td><td>Europe, harmonised specifications<\/td><td>CX, ZX, MX, CMX series<\/td><\/tr>\n<tr><td>ASTM E797<\/td><td>Thickness measurement practice<\/td><td>North American international standard<\/td><td>CX, ZX, MX, CMX series<\/td><\/tr>\n<tr><td>EN 15317<\/td><td>Thickness gauge qualification<\/td><td>Periodic verification of accuracy<\/td><td>CX series (official declaration)<\/td><\/tr>\n<tr><td>EN 12668-1<\/td><td>Flaw detection equipment qualification<\/td><td>Europe, flaw detectors<\/td><td>FX70-DL, FX71-DL, FX81-DL<\/td><\/tr>\n<\/tbody><\/table><\/figure>\n\n<h2 class=\"wp-block-heading\">Why it matters that the instrument is compliant<\/h2>\n\n<p class=\"wp-block-paragraph\">Compliance with standards is not a mere bureaucratic formality. It has practical consequences: <\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Legal validity<\/strong> of inspection reports in litigation and technical disputes<\/li>\n<li><strong>Acceptance by the client<\/strong>: many specifications explicitly require instruments that comply with EN 14127 or ASTM E797<\/li>\n<li><strong>Personnel qualification<\/strong>: the EN ISO 9712 standards for qualifying NDT personnel require inspections to be carried out with qualified instruments<\/li>\n<li><strong>Metrological traceability<\/strong>: calibration traceable to NIST or equivalent bodies is a regulatory requirement in regulated sectors<\/li>\n<li><strong>Plant approvals<\/strong>: the PED and ATEX directives and their national transpositions refer explicitly to these standards<\/li>\n<\/ul>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<p class=\"wp-block-paragraph\">For advice on choosing Dakota instruments that comply with Your specific inspection procedures, and on periodic verification services, <a href=\"https:\/\/ultrasuonindt.it\/en\/contact\/\">contact our technical office<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The reference NDT standards for ultrasonic thickness measurement: EN 14127 for the measurement procedure, ASTM E797 as the American standard, EN 15317 for instrument qualification and EN 12668-1 for flaw detectors. All Dakota instruments are declared compliant. <\/p>\n","protected":false},"author":157040980,"featured_media":9177,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"{title}\n\n{excerpt}\n\n{url}","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false,"jetpack_post_was_ever_published":false},"categories":[179],"tags":[116,180,77,76],"class_list":["post-9176","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-standards-and-regulations","tag-astm-e797-ultrasonic-thickness-measurement","tag-en-14127-ultrasonic-thickness-measurement","tag-thickness-measurement-on-carbon-steel","tag-ultrasonic-corrosion-measurement"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>NDT Standards for Thickness Measurement: EN 14127 ASTM E797 | RODER<\/title>\n<meta name=\"description\" content=\"A guide to the NDT standards for ultrasonic thickness measurement: EN 14127, ASTM E797, EN 15317 and EN 12668-1. 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A guide to understanding when one of the two is enough, when you need both and when to choose a hybrid Dakota FX instrument.","rel":"","context":"In &quot;Product Comparisons&quot;","block_context":{"text":"Product Comparisons","link":"https:\/\/ultrasuonindt.it\/en\/categoria\/product-comparisons\/"},"img":{"alt_text":"Dakota NDT family of ultrasonic instruments for thickness and corrosion testing","src":"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-famiglia-di-strumenti_di_misura_ad_ultrasuoni_per_controllo_di_spessore_e_corrosione-web-560x560-1.webp?fit=560%2C560&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-famiglia-di-strumenti_di_misura_ad_ultrasuoni_per_controllo_di_spessore_e_corrosione-web-560x560-1.webp?fit=560%2C560&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-famiglia-di-strumenti_di_misura_ad_ultrasuoni_per_controllo_di_spessore_e_corrosione-web-560x560-1.webp?fit=560%2C560&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":8117,"url":"https:\/\/ultrasuonindt.it\/en\/thickness-measurement-in-goods-inwards-quality-control\/","url_meta":{"origin":9176,"position":4},"title":"Thickness measurement in goods-inwards quality control","author":"GSM","date":"17 April 2026","format":false,"excerpt":"Ultrasonic thickness measurement in goods-inwards quality control verifies that plate, tube and section steel complies with the tolerances declared by the supplier. 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