{"id":3763,"date":"2026-01-06T23:22:22","date_gmt":"2026-01-06T22:22:22","guid":{"rendered":"https:\/\/contec-ias.com\/case\/verouderde-schuifafsluiters-en-hydraulische-regeleenheden-vervangen-tijdens-turnaround\/"},"modified":"2026-04-28T12:26:35","modified_gmt":"2026-04-28T11:26:35","slug":"verouderde-schuifafsluiters-en-hydraulische-regeleenheden-vervangen-tijdens-turnaround","status":"publish","type":"case","link":"https:\/\/contec-ias.com\/nl\/case\/verouderde-schuifafsluiters-en-hydraulische-regeleenheden-vervangen-tijdens-turnaround\/","title":{"rendered":"Verouderde schuifafsluiters en hydraulische regeleenheden vervangen tijdens turnaround"},"content":{"rendered":"\n<section  class=\"we-usps\" data-aos=\"fade\">\n    <div class=\"inner-content\">\n                        <div class=\"usps-container\">\n                                    <div class=\"usp-item\" data-aos=\"fade-up\">\n                <div class=\"content\">\n                    <h3><strong>Engineering van een kritische upgrade van kleppen en regelsystemen in FCC-operaties<\/strong><\/h3>\n<p>Ter voorbereiding op een van zijn grootste turnarounds, selecteerde een grote klant in de petrochemische sector Contec voor de levering van verschillende kritieke upgrade-projecten, waaronder de vervanging van twee grote schuifafsluiters (SV's) en hun hydraulische besturingseenheden (HCU's) binnen een Fluid Catalytic Cracking Unit (FCCU).<\/p>\n<p>De bestaande systemen waren onbetrouwbaar en verouderd. Storingen konden leiden tot het uitvallen van eenheden, veiligheidsrisico&#8217;s of productieverliezen. De uitdaging was om de upgrade uit te voeren binnen een kort tijdsbestek en met beperkte ruimte, en tegelijkertijd volledig te voldoen aan de veiligheidsnormen en SIL-vereisten.  <\/p>\n<p>Door nauwe samenwerking met de teams van de klant op het gebied van processen, mechanica, pijpleidingen, instrumentatie en elektriciteit leverde Contec een complete engineeringoplossing, van concept tot bouwpakket.<\/p>\n<p><strong>Belangrijkste resultaten:<\/strong><\/p>\n                <\/div>\n                                <ul class=\"usps-list\">\n                                        <li class=\"usp-list-item\">\n                        <img decoding=\"async\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/icon-electric.svg\" alt=\"\">\n                        <b class=\"usp-text\">\n                            SIL-conform ontwerp met meerdere redundantielagen                        <\/b>\n                    <\/li>\n                                        <li class=\"usp-list-item\">\n                        <img decoding=\"async\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/icon-electric.svg\" alt=\"\">\n                        <b class=\"usp-text\">\n                            ESD-functionaliteit (nooduitschakeling) met &lt;5s sluiting                        <\/b>\n                    <\/li>\n                                        <li class=\"usp-list-item\">\n                        <img decoding=\"async\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/icon-electric.svg\" alt=\"\">\n                        <b class=\"usp-text\">\n                            Integratie van nieuwe HCU- en SVC-systemen met DCS en MCC                        <\/b>\n                    <\/li>\n                                        <li class=\"usp-list-item\">\n                        <img decoding=\"async\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/icon-electric.svg\" alt=\"\">\n                        <b class=\"usp-text\">\n                            Tekeningen voor kabelgeleiding, onderlinge verbindingen en lussen voor installatie                        <\/b>\n                    <\/li>\n                                        <li class=\"usp-list-item\">\n                        <img decoding=\"async\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/icon-electric.svg\" alt=\"\">\n                        <b class=\"usp-text\">\n                            Tijdige levering van een compleet bouwpakket                        <\/b>\n                    <\/li>\n                                        <li class=\"usp-list-item\">\n                        <img decoding=\"async\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/icon-electric.svg\" alt=\"\">\n                        <b class=\"usp-text\">\n                            FAT-voorbereiding en QA\/QC-documentatie voor uitvoeringsfase                        <\/b>\n                    <\/li>\n                                    <\/ul>\n                            <\/div>\n                    <\/div>\n        <\/section>\n<section  class=\"we-image_content\">\n    <div class=\"inner-content left default inhoud\">\n        <div class=\"content\" data-aos=\"fade-left\">\n            <p class=\"small-title\">\n                De uitdaging            <\/p>\n            <div class=\"the-content\">\n                <h2>Verouderings- en veiligheidsrisico&#8217;s beperken tijdens een turnaround onder hoge druk<\/h2>\n<p>De oorspronkelijke schuifafsluiters en hydraulische regelunits voldeden niet langer aan de operationele of veiligheidsverwachtingen. Het ingenieursteam had te maken met een krap tijdschema, beperkte toegangsruimte en de noodzaak om meerdere disciplines te co\u00f6rdineren, en dit alles terwijl het team zich voorbereidde op een naadloze opstart na de vervanging. <\/p>\n<p><span style=\"font-weight: 400;\"> <\/span><\/p>\n            <\/div>\n                    <\/div>\n        <div class=\"image-container\" data-aos=\"fade-right\">\n            <img decoding=\"async\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2026\/03\/empty-modern-conveyor-belt-production-line-part-industrial-equipment-factory-plant-automatic-system-line-scaled.jpg\" alt=\"\">\n        <\/div>\n    <\/div>\n<\/section>\n\n<section  class=\"we-slider_image\" data-aos=\"fade-up\">\n    <div class=\"inner-content\">\n                    <div class=\"images-wrapper\">\n                <div class=\"images-container\">\n                                            <div class=\"image-container\">\n                            <img decoding=\"async\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2026\/01\/tank-terminal-02.jpg\" alt=\"tank terminal\">\n                        <\/div>\n                                            <div class=\"image-container\">\n                            <img decoding=\"async\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2026\/01\/tank-terminal-01.jpg\" alt=\"\">\n                        <\/div>\n                                            <div class=\"image-container\">\n                            <img decoding=\"async\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2026\/01\/tank-terminal-03.jpg\" alt=\"\">\n                        <\/div>\n                                            <div class=\"image-container\">\n                            <img decoding=\"async\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/11\/iso-article3.jpg\" alt=\"\">\n                        <\/div>\n                                            <div class=\"image-container\">\n                            <img decoding=\"async\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/11\/iso-article4.jpg\" alt=\"\">\n                        <\/div>\n                                            <div class=\"image-container\">\n                            <img decoding=\"async\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/11\/iso-article1.jpg\" alt=\"\">\n                        <\/div>\n                                            <div class=\"image-container\">\n                            <img decoding=\"async\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/11\/iso-article2.jpg\" alt=\"\">\n                        <\/div>\n                                    <\/div>\n                <div class=\"arrows\">\n                    <button class=\"prev-arrow\">\n                        <svg width=\"14\" height=\"14\" viewBox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                            <path\n                                d=\"M8.707 1.70703L7.293 0.29303L0.586001 7.00003L7.293 13.707L8.707 12.293L4.414 8.00003L14 8.00003L14 6.00003L4.414 6.00003L8.707 1.70703Z\"\n                                fill=\"currentColor\" \/>\n                        <\/svg>\n                    <\/button>\n                    <button class=\"next-arrow\">\n                        <svg width=\"14\" height=\"14\" viewBox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                            <path\n                                d=\"M5.293 12.293L6.707 13.707L13.414 6.99997L6.707 0.292969L5.293 1.70697L9.586 5.99997H0V7.99997H9.586L5.293 12.293Z\"\n                                fill=\"currentColor\" \/>\n                        <\/svg>\n                    <\/button>\n                <\/div>\n            <\/div>\n            <\/div>\n<\/section>\n\n<section  class=\"we-content_columns\">\n    <div class=\"inner-content\">\n                    <p class=\"small-title\" data-aos=\"fade-up\">\n                Onze aanpak            <\/p>\n                <div class=\"intro-container\" data-aos=\"fade-up\">\n            <h2>Multidisciplinair ontwerp voor de vervanging van apparatuur met hoge inzet<\/h2>\n        <\/div>\n        <div class=\"columns-container\">\n                            <div class=\"column\" data-aos=\"fade-up\" data-aos-delay=\"0\">\n                    <div class=\"the-content\">\n                        <p><strong>Concept- en FEED-fase<\/strong><\/p>\n<p>We werkten nauw samen met de klant om functionele vereisten, batterijlimieten en procesintegratiepunten te defini\u00ebren. Budgetramingen ondersteunden financieringsaanvragen en dekten materialen, programmering en kosten van de eigenaar. <\/p>\n<p><strong>Gedetailleerde engineering<\/strong><\/p>\n<ul>\n<li>Aanvraagpakket voor schuifafsluiters en HCU's, inclusief:\n<ul>\n<li>SIL-conforme veiligheidslogica en 2oo3 magneetventiel ESD-configuratie<\/li>\n<li>Redundante CPU's, pompen en voedingen<\/li>\n<li>Brandwerende hydraulische vloeistof en conform ATEX Zone 1<\/li>\n<li>Diagnostische terugkoppeling en Lock-In-Place (LIP) veiligheidslogica<\/li>\n<li>Warmtebeperkende strategie\u00ebn via motoren met lage snelheid en afscherming<\/li>\n<\/ul>\n<\/li>\n<li>Bouwpakket voor E&amp;I aannemer:\n<ul>\n<li>Kabelblokschema's, lustekeningen en herziene P&amp;ID's<\/li>\n<li>Leggen van kabelgoten en interconnectie met MCC, DCS en SCADA<\/li>\n<li>Bijgewerkte oorzaak- en gevolgmatrix en softwarevlaggen voor programmering<\/li>\n<li>SIL-berekeningen, dimensionering van kabels en selectiviteitsstudies<\/li>\n<li>Evaluatie- en verduidelijkingsvergaderingen met leveranciers<\/li>\n<li>Voorbereiding van FAT-checklists en QA\/QC-producten<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n                    <\/div>\n                <\/div>\n                            <div class=\"column\" data-aos=\"fade-up\" data-aos-delay=\"50\">\n                    <div class=\"the-content\">\n                        <p>Dankzij de nauwe samenwerking met alle belanghebbenden heeft Contec op tijd een engineeringpakket van hoge kwaliteit afgeleverd, waarmee de basis werd gelegd voor een veilige, succesvolle uitvoering tijdens de turnaround en een betrouwbare herstart van de FCCU.<\/p>\n                    <\/div>\n                <\/div>\n                    <\/div>\n    <\/div>\n<\/section>\n\n<section  class=\"we-featured_services\">\n    <div class=\"inner-content\">\n        <div class=\"title-container the-content\" data-aos=\"fade-up\">\n            <h2><span style=\"font-weight: 400;\">Meer informatie over onze diensten<\/span><\/h2>\n        <\/div>\n                    <div class=\"services-container\">\n                                                        <div class=\"service-item\" data-aos=\"fade-up\" data-aos-delay=\"0\">\n                        <div class=\"top\">\n                            <h4>Beheer van productieprocessen<\/h4>\n                        <\/div>\n                        <div class=\"bottom\">\n                            <div class=\"image-container\"><img decoding=\"async\" width=\"1000\" height=\"1500\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/service-manufacturing-operations.jpg\" class=\"attachment-large size-large wp-post-image\" alt=\"\" srcset=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/service-manufacturing-operations.jpg 1000w, https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/service-manufacturing-operations-200x300.jpg 200w, https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/service-manufacturing-operations-768x1152.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/div>\n                            <div class=\"arrow\">\n                                <a href=\"https:\/\/contec-ias.com\/nl\/dienst\/beheer-van-productieprocessen\/\">\n                                    <svg width=\"21\" height=\"22\" viewBox=\"0 0 21 22\" fill=\"none\"\n                                        xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                        <path\n                                            d=\"M7.9395 18.9395L10.0605 21.0605L20.121 11L10.0605 0.939453L7.9395 3.06045L14.379 9.49995H0V12.5H14.379L7.9395 18.9395Z\"\n                                            fill=\"currentColor\" \/>\n                                    <\/svg>\n                                <\/a>\n                            <\/div>\n                        <\/div>\n                        <a href=\"https:\/\/contec-ias.com\/nl\/dienst\/beheer-van-productieprocessen\/\" class=\"full-link\"><\/a>\n                    <\/div>\n                                                        <div class=\"service-item\" data-aos=\"fade-up\" data-aos-delay=\"50\">\n                        <div class=\"top\">\n                            <h4>Productiecontrole<\/h4>\n                        <\/div>\n                        <div class=\"bottom\">\n                            <div class=\"image-container\"><img decoding=\"async\" width=\"1000\" height=\"1500\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/service-manufacturing-control.jpg\" class=\"attachment-large size-large wp-post-image\" alt=\"\" srcset=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/service-manufacturing-control.jpg 1000w, https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/service-manufacturing-control-200x300.jpg 200w, https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/service-manufacturing-control-768x1152.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/div>\n                            <div class=\"arrow\">\n                                <a href=\"https:\/\/contec-ias.com\/nl\/dienst\/productiecontrole\/\">\n                                    <svg width=\"21\" height=\"22\" viewBox=\"0 0 21 22\" fill=\"none\"\n                                        xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                        <path\n                                            d=\"M7.9395 18.9395L10.0605 21.0605L20.121 11L10.0605 0.939453L7.9395 3.06045L14.379 9.49995H0V12.5H14.379L7.9395 18.9395Z\"\n                                            fill=\"currentColor\" \/>\n                                    <\/svg>\n                                <\/a>\n                            <\/div>\n                        <\/div>\n                        <a href=\"https:\/\/contec-ias.com\/nl\/dienst\/productiecontrole\/\" class=\"full-link\"><\/a>\n                    <\/div>\n                                                        <div class=\"service-item\" data-aos=\"fade-up\" data-aos-delay=\"100\">\n                        <div class=\"top\">\n                            <h4>Elektrotechniek<\/h4>\n                        <\/div>\n                        <div class=\"bottom\">\n                            <div class=\"image-container\"><img decoding=\"async\" width=\"1000\" height=\"1500\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/service-electrical-engineering.jpg\" class=\"attachment-large size-large wp-post-image\" alt=\"\" srcset=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/service-electrical-engineering.jpg 1000w, https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/service-electrical-engineering-200x300.jpg 200w, https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/service-electrical-engineering-768x1152.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/div>\n                            <div class=\"arrow\">\n                                <a href=\"https:\/\/contec-ias.com\/nl\/dienst\/elektrotechniek\/\">\n                                    <svg width=\"21\" height=\"22\" viewBox=\"0 0 21 22\" fill=\"none\"\n                                        xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                        <path\n                                            d=\"M7.9395 18.9395L10.0605 21.0605L20.121 11L10.0605 0.939453L7.9395 3.06045L14.379 9.49995H0V12.5H14.379L7.9395 18.9395Z\"\n                                            fill=\"currentColor\" \/>\n                                    <\/svg>\n                                <\/a>\n                            <\/div>\n                        <\/div>\n                        <a href=\"https:\/\/contec-ias.com\/nl\/dienst\/elektrotechniek\/\" class=\"full-link\"><\/a>\n                    <\/div>\n                            <\/div>\n            <\/div>\n<\/section>\n\n<section  class=\"we-featured_cases\">\n    <div class=\"inner-content\">\n        \n        <div class=\"the-content\" data-aos=\"fade-up\">\n            <h2><span style=\"font-weight: 400;\">Verwante gevallen<\/span><\/h2>\n        <\/div>\n                    <div class=\"cases-container\">\n                                                        <div class=\"case-item\" data-aos=\"fade-up\" data-aos-delay=\"0\">\n                        <div class=\"image-container\">\n                            <img decoding=\"async\" width=\"1200\" height=\"673\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/electrical-motor.png\" class=\"attachment-large size-large wp-post-image\" alt=\"electrical motor\" srcset=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/electrical-motor.png 1200w, https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/electrical-motor-300x168.png 300w, https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/03\/electrical-motor-768x431.png 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/>                        <\/div>\n                        <div class=\"info\">\n                            <div class=\"arrow\">\n                                <a href=\"https:\/\/contec-ias.com\/nl\/case\/een-stoomturbine-vervangen-door-een-hoogspanningsfrequentiegeregelde-elektromotor\/\">\n                                    <svg width=\"14\" height=\"14\" viewBox=\"0 0 14 14\" fill=\"none\"\n                                        xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                        <path\n                                            d=\"M5.293 12.293L6.707 13.707L13.414 6.99997L6.707 0.292969L5.293 1.70697L9.586 5.99997H0V7.99997H9.586L5.293 12.293Z\"\n                                            fill=\"currentColor\" \/>\n                                    <\/svg>\n\n                                <\/a>\n                            <\/div>\n                            <h4>Een stoomturbine vervangen door een hoogspanningsfrequentiegeregelde elektromotor<\/h4>\n                        <\/div>\n                        <a href=\"https:\/\/contec-ias.com\/nl\/case\/een-stoomturbine-vervangen-door-een-hoogspanningsfrequentiegeregelde-elektromotor\/\" class=\"full-link\"><\/a>\n                    <\/div>\n                                                        <div class=\"case-item\" data-aos=\"fade-up\" data-aos-delay=\"50\">\n                        <div class=\"image-container\">\n                            <img decoding=\"async\" width=\"1200\" height=\"706\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/04\/oil-and-gas.png\" class=\"attachment-large size-large wp-post-image\" alt=\"oil and gas\" srcset=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/04\/oil-and-gas.png 1200w, https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/04\/oil-and-gas-300x177.png 300w, https:\/\/contec-ias.com\/wp-content\/uploads\/2025\/04\/oil-and-gas-768x452.png 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/>                        <\/div>\n                        <div class=\"info\">\n                            <div class=\"arrow\">\n                                <a href=\"https:\/\/contec-ias.com\/nl\/case\/renovatie-hv-mv-substation-in-olieraffinaderij\/\">\n                                    <svg width=\"14\" height=\"14\" viewBox=\"0 0 14 14\" fill=\"none\"\n                                        xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                        <path\n                                            d=\"M5.293 12.293L6.707 13.707L13.414 6.99997L6.707 0.292969L5.293 1.70697L9.586 5.99997H0V7.99997H9.586L5.293 12.293Z\"\n                                            fill=\"currentColor\" \/>\n                                    <\/svg>\n\n                                <\/a>\n                            <\/div>\n                            <h4>Renovatie HV\/MV-substation in olieraffinaderij<\/h4>\n                        <\/div>\n                        <a href=\"https:\/\/contec-ias.com\/nl\/case\/renovatie-hv-mv-substation-in-olieraffinaderij\/\" class=\"full-link\"><\/a>\n                    <\/div>\n                                                        <div class=\"case-item\" data-aos=\"fade-up\" data-aos-delay=\"100\">\n                        <div class=\"image-container\">\n                            <img decoding=\"async\" width=\"1200\" height=\"900\" src=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2026\/01\/tank-terminal-02.jpg\" class=\"attachment-large size-large wp-post-image\" alt=\"tank terminal\" srcset=\"https:\/\/contec-ias.com\/wp-content\/uploads\/2026\/01\/tank-terminal-02.jpg 1200w, https:\/\/contec-ias.com\/wp-content\/uploads\/2026\/01\/tank-terminal-02-300x225.jpg 300w, https:\/\/contec-ias.com\/wp-content\/uploads\/2026\/01\/tank-terminal-02-768x576.jpg 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/>                        <\/div>\n                        <div class=\"info\">\n                            <div class=\"arrow\">\n                                <a href=\"https:\/\/contec-ias.com\/nl\/case\/ei-engineering-voor-uitbreiding-tankterminal-in-nederland\/\">\n                                    <svg width=\"14\" height=\"14\" viewBox=\"0 0 14 14\" fill=\"none\"\n                                        xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                        <path\n                                            d=\"M5.293 12.293L6.707 13.707L13.414 6.99997L6.707 0.292969L5.293 1.70697L9.586 5.99997H0V7.99997H9.586L5.293 12.293Z\"\n                                            fill=\"currentColor\" \/>\n                                    <\/svg>\n\n                                <\/a>\n                            <\/div>\n                            <h4>E&amp;I Engineering voor uitbreiding tankterminal in Nederland<\/h4>\n                        <\/div>\n                        <a href=\"https:\/\/contec-ias.com\/nl\/case\/ei-engineering-voor-uitbreiding-tankterminal-in-nederland\/\" class=\"full-link\"><\/a>\n                    <\/div>\n                            <\/div>\n            <\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"","protected":false},"featured_media":3758,"menu_order":118,"template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-3763","case","type-case","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Verouderde schuifafsluiters en hydraulische regeleenheden vervangen tijdens turnaround - 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