{"id":3007,"date":"2025-07-31T17:57:21","date_gmt":"2025-07-31T15:57:21","guid":{"rendered":"https:\/\/jureknawrocki.com\/?p=3007"},"modified":"2026-03-14T08:04:01","modified_gmt":"2026-03-14T07:04:01","slug":"co-moglo-pojsc-zle-cz-ii","status":"publish","type":"post","link":"https:\/\/jureknawrocki.com\/en\/co-moglo-pojsc-zle-cz-ii\/","title":{"rendered":"What went wrong II"},"content":{"rendered":"<p class=\"has-text-align-left\">I recently completed an expert report that provided a reasonable explanation for the probable cause of a failure in DN 280 PVC cooling water pipelines. This resulted in the dismissal of claims for approximately \u20ac100,000. The failure resulted from the leakage of adhesive joints during a pressure test. The system's floor plan was sized within a 130 x 30 m rectangle. To substantiate its claim against the pipe manufacturer, the installation contractor commissioned an expert report that concluded the leak was caused by excessive pipe ovalization. This is a completely erroneous position, as Table 1, titled \"Nominal outside diameters and tolerances,\" in the PN-EN ISO 1452-2:2010 standard, refers to comment d: \"The requirements regarding ovality apply only to pipes before they leave the manufacturer's premises.\"<\/p>\n\n\n\n<p class=\"has-text-align-left\">Due to the above, the manufacturer suspected that the real cause of the failure was errors during the gluing of the joints. The sleeves were cut in half and the gluing quality was assessed in the designated areas.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"528\" src=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/1-2.jpg\" alt=\"\" class=\"wp-image-3008\" style=\"width:462px;height:auto\" srcset=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/1-2.jpg 800w, https:\/\/jureknawrocki.com\/wp-content\/uploads\/1-2-480x317.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 800px, 100vw\" \/><\/figure>\n\n\n\n<p>The photo below shows the lack of chamfering of the right pipe edge, which is inconsistent with the pipe manufacturer's requirements described in the gluing instructions.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/2-2-1024x768.jpg\" alt=\"\" class=\"wp-image-3009\" style=\"width:625px;height:auto\" srcset=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/2-2-980x735.jpg 980w, https:\/\/jureknawrocki.com\/wp-content\/uploads\/2-2-480x360.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/figure>\n\n\n\n<p>The photo below shows a missing layer of adhesive across the entire length of the pipe inserted into the sleeve, which is essentially the source of the leak. The pipe end was beveled, but not enough adhesive was applied.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/4-2-1024x768.jpg\" alt=\"\" class=\"wp-image-3011\" srcset=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/4-2-980x735.jpg 980w, https:\/\/jureknawrocki.com\/wp-content\/uploads\/4-2-480x360.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/figure>\n\n\n\n<p>The photo below shows a missing adhesive layer approximately \u00be of the way into the socket. The pipe end was beveled, but not enough adhesive was applied.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/5-2-1024x768.jpg\" alt=\"\" class=\"wp-image-3012\" srcset=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/5-2-980x735.jpg 980w, https:\/\/jureknawrocki.com\/wp-content\/uploads\/5-2-480x360.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/figure>\n\n\n\n<p>The photos below show sections of the joint showing a lack of adhesive at a depth of several millimeters. The shiny, scratch-free pipe surface is clearly visible, proving that the author did not interfere with the adhesive joint during the tests.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"507\" height=\"363\" src=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/6-2.jpg\" alt=\"\" class=\"wp-image-3013\" style=\"width:511px;height:auto\" srcset=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/6-2.jpg 507w, https:\/\/jureknawrocki.com\/wp-content\/uploads\/6-2-480x344.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 507px, 100vw\" \/><\/figure>\n\n\n\n<p>To demonstrate the microscopic image of a properly executed joint, another fitting was examined. A thin line, darker than the adjacent sections, is clearly visible. This represents a properly applied adhesive layer.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"360\" height=\"254\" src=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/7-2.jpg\" alt=\"\" class=\"wp-image-3014\" style=\"width:823px;height:auto\" srcset=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/7-2.jpg 360w, https:\/\/jureknawrocki.com\/wp-content\/uploads\/7-2-300x212.jpg 300w, https:\/\/jureknawrocki.com\/wp-content\/uploads\/7-2-18x12.jpg 18w\" sizes=\"(max-width: 360px) 100vw, 360px\" \/><\/figure>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;<\/p>\n\n\n\n<p><br><br><\/p>\n\n\n\n<p><br><\/p>","protected":false},"excerpt":{"rendered":"<p>Niedawno zrobi\u0142em ekspertyz\u0119, kt\u00f3ra przedstawi\u0142a uzasadnion\u0105 odpowied\u017a na prawdopodobn\u0105 przyczyn\u0119 awarii ruroci\u0105g\u00f3w instalacji wody ch\u0142odniczej PVC DN 280. W ten spo\u00f3b oddalone zosta\u0142y roszczenia na oko\u0142o 100 ty\u015b Euro. Awaria polega\u0142a na rozszczelnieniu si\u0119 po\u0142\u0105cze\u0144 klejowych podczas pr\u00f3by ci\u015bnienia. Instalacja w rzucie mie\u015bci\u0142a si\u0119 w prostok\u0105cie 130 x 30 m. Wykonawca instalacji w celu uwiarygodnienie [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":3008,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[128,127,123,15],"tags":[16,57,23],"class_list":["post-3007","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ekspertyzy","category-budowlanka","category-obliczenia-wytrzymalosciowe-rur-i-aparatow","category-projekty","tag-naprezenia","tag-pvc","tag-rurociagi"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Co mog\u0142o p\u00f3j\u015b\u0107 \u017ale cz.II - Jerzy Nawrocki<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jureknawrocki.com\/en\/co-moglo-pojsc-zle-cz-ii\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Co mog\u0142o p\u00f3j\u015b\u0107 \u017ale cz.II - Jerzy Nawrocki\" \/>\n<meta property=\"og:description\" content=\"Niedawno zrobi\u0142em ekspertyz\u0119, kt\u00f3ra przedstawi\u0142a uzasadnion\u0105 odpowied\u017a na prawdopodobn\u0105 przyczyn\u0119 awarii ruroci\u0105g\u00f3w instalacji wody ch\u0142odniczej PVC DN 280. W ten spo\u00f3b oddalone zosta\u0142y roszczenia na oko\u0142o 100 ty\u015b Euro. Awaria polega\u0142a na rozszczelnieniu si\u0119 po\u0142\u0105cze\u0144 klejowych podczas pr\u00f3by ci\u015bnienia. Instalacja w rzucie mie\u015bci\u0142a si\u0119 w prostok\u0105cie 130 x 30 m. 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W ten spo\u00f3b oddalone zosta\u0142y roszczenia na oko\u0142o 100 ty\u015b Euro. Awaria polega\u0142a na rozszczelnieniu si\u0119 po\u0142\u0105cze\u0144 klejowych podczas pr\u00f3by ci\u015bnienia. Instalacja w rzucie mie\u015bci\u0142a si\u0119 w prostok\u0105cie 130 x 30 m. 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