[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-297585-105":59,"doc-detail-297585-en":131},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":124,"head_meta":126,"extra_data":128,"updated_unix":130},105,"en","a-root-cause-analysis-result-for-coating-and-corrosion-control-engineers-root-cause-analysis","A Root Cause Analysis Result for Coating and Corrosion Control Engineers - Root Cause Analysis","","Root cause analysis investigates blistering of twin wire arc sprayed aluminium (TSA) coatings observed on LNG module pipe-spools and equipment during construction. Blistering occurred at areas protected by aluminium glass fiber tarpaulin, while coated areas outside the coverage did not show the issue. Field observations identified dark grey, corroded regions with aluminium oxide deposits and wet conditions after tarpaulin removal, accompanied by porosity, unmolten particles, cracks, and limited coating thickness confirmed by metallographic, SEM, and EDS examinations.",{"@graph":69,"@context":123},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/a-root-cause-analysis-result-for-coating-and-corrosion-control-engineers-root-cause-analysis/297585/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/a-root-cause-analysis-result-for-coating-and-corrosion-control-engineers-root-cause-analysis/297585.png","ImageObject",300,407,{"name":92,"@type":93},"Rizky","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-04","2026-09-18",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",12,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"Where was TSA blistering observed during the LNG module construction phase?","Question",{"text":113,"@type":114},"Blistering was observed on pipe-spools and equipment coated with TSA during construction. It was limited to approximately 5% of the total TSA coated area.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"What condition strongly correlated with the blistering occurrence?",{"text":118,"@type":114},"Blistering occurred only in areas protected with an aluminium glass fiber tarpaulin. Boundaries between covered and uncovered areas were clearly visible after opening the tarpaulin.",{"name":120,"@type":111,"acceptedAnswer":121},"What did SEM/EDS and metallographic cross-section analyses indicate?",{"text":122,"@type":114},"EDS detected elements consistent with corrosion-related deposits, and metallographic cross-sections showed high porosity, unmolten or partially molten aluminium particles, low coating thickness, and cracks.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},297585,1789745975,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":34,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":130,"read_time":144,"preview_page_count":4},962085564807,"https://ap-avatar.wpscdn.com/davatar_6f874abed73319feea01a86fa6f0fab8","A Root Cause Analysis Result for Coating and Corrosion Control Engineers  \nBlistering of Thermal Sprayed Aluminium  \nAlbert-Jan van der Sloot (苏岩) 1  \n1 Coating and Corrosion Specialist (SME) at QCC – Qingdao Coating Consultants Co., LTD-Qingdao, Shandong, China.  \n1. INTRODUCTION  \nBlistering of twin wire arc sprayed aluminium coating (TSA) was observed on pipe-spools and equipment during the construction phase of some new build LNG modules. Blistering of the TSA had occurred at approximately 5% of the total TSA coated area. The pipe-spools and equipment coated with the TSA are made of carbon steel or stainless steel. The areas with TSA blistering had been protected with an aluminium glass fiber tarpaulin to protect the coated areas from damage during handling, transport, and storage. The first blistered areas were discovered in October 2020, after the warm Months of June till September. This root cause analysis was executed at the premises of the TSA application company and onsite at the construction yard.  \nII. ROOT CAUSE ANALYSIS  \nBlistering of the TSA coating was only observed at areas that were protected with an aluminium glass fiber tarpaulin. At the premises of the application company an analysis was executed regarding the surface preparation and application conditions and procedures. During this analysis the following was observed:  \n1) All the materials and equipment used are as specified. (*)  \n2) The surface preparation and application parameters are as specified. (*)  \n3) The testing methods are as specified. (*)  \n4) TSA blistering does not occur at the sub-contractors application site.  \n(*) As per Technical Specification for Thermal Spray Coatings of Aluminium agreed upon by all parties involved.  \nAfter reviewing the observations, no direct connection could be made between the observed blistering of TSA and the TSA application site.  \nAn onsite root analysis at the construction yard revealed that the TSA coating shows clear boundaries between areas that had been covered with the aluminium glass fiber tarpaulin and areas that had not been covered. All the aluminium glass fiber tarpaulin covered areas had discolored and turned dark grey which is indicative for the corrosion reaction of the TSA when in contact with moist.  \nAfter removal of the tarpaulin a 100% wet TSA surface was observed at the upper part of the pipe spool. At the wet TSA surface pH measurements were taken and pH values obtained are between pH 6 and 7. Scattered areas with clear boundaries of white aluminium oxide deposits were visible.  \nCondition of TSA after opening of aluminium glass fiber tarpaulin  \nDark Grey Areas with TSA blistering  \nDark Grey Areas with TSA blistering  \nAt the dark grey areas were blistering of the TSA coating was observed the diameter of the blisters varies between 5mm and 12mm. All blisters observed are cracked at the top. There is no liquid inside the blister and al blistering areas examined are atthe upper part and sides of the pipe spool as installed. At certain blisters the stainless-steel and carbon steel surface had started to corrode.  \nBlisters observed are cracked at the top Surface underneath the blister has started to corrode.  \nThe discolored dark grey surface shows a shiny aluminium surface after sanding with coarse sanding paper. To determine the presence of soluble matter on top of the exposed TSA layer a Bresle test was executed according to the international standard ISO 8502-6 and ISO 8502-9. The result was 9 mg/m2 which is a low value considering the C4 environment of the construction site location. It should be mentioned that there were heavy rain showers on the construction site in the past days that may have had a cleansing effect on the current deposits. All other areas examined show a similar condition  \nThe following specimens, which were collected during the onsite root cause analysis have been examined by SEM and EDS analysis.  \n1. Specimen No. 1A-Corrosion deposits collected from the sur","cbCaildiiw3A1bMu","https://ap.wps.com/l/cbCaildiiw3A1bMu","pdf",1039886,"English","# I. INTRODUCTION\n# II. ROOT CAUSE ANALYSIS\n## Observations and site investigation\n## Tarpaulin-related discoloration and deposits\n## pH measurements and soluble matter (Bresle test)\n## Specimen examination (SEM/EDS)\n## Metallographic cross-section findings\n## Literature review for blistering mechanism","[{\"question\":\"Where was TSA blistering observed during the LNG module construction phase?\",\"answer\":\"Blistering was observed on pipe-spools and equipment coated with TSA during construction. It was limited to approximately 5% of the total TSA coated area.\"},{\"question\":\"What condition strongly correlated with the blistering occurrence?\",\"answer\":\"Blistering occurred only in areas protected with an aluminium glass fiber tarpaulin. Boundaries between covered and uncovered areas were clearly visible after opening the tarpaulin.\"},{\"question\":\"What did SEM/EDS and metallographic cross-section analyses indicate?\",\"answer\":\"EDS detected elements consistent with corrosion-related deposits, and metallographic cross-sections showed high porosity, unmolten or partially molten aluminium particles, low coating thickness, and cracks.\"}]","A Root Cause Analysis Result for Coating and Corrosion Control Engineers - Root Cause Analysis | PDF",18]