{"id":4059,"date":"2026-09-09T16:12:56","date_gmt":"2026-09-09T14:12:56","guid":{"rendered":"https:\/\/www.di-camillo.com\/installazione-serbatoio-panettone-polietilene\/"},"modified":"2026-09-09T17:07:15","modified_gmt":"2026-09-09T15:07:15","slug":"installing-a-flat-bottom-panettone-polyethylene-tank-technical-guidelines-for-foundations-and-fittings","status":"publish","type":"post","link":"https:\/\/www.di-camillo.com\/en\/installing-a-flat-bottom-panettone-polyethylene-tank-technical-guidelines-for-foundations-and-fittings\/","title":{"rendered":"Installing a flat-bottom &#8220;panettone&#8221; polyethylene tank: technical guidelines for foundations and fittings"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">In the hydraulic and civil plant engineering sector<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.di-camillo.com\/en\/products\/8000-liters-undergound-tank-in-polyethylene-with-pump\/\" target=\"_blank\" rel=\"noopener\">t<strong>he flat-bottom (&#8220;panettone&#8221;) high-density polyethylene (HDPE)<\/strong><\/a> tank is a<a href=\"https:\/\/www.di-camillo.com\/en\/products\/3000-liters-underground-water-tank\/\" target=\"_blank\" rel=\"noopener\"> <strong>frequent choice for storing potable water or first-flush rainwater at atmospheric pressure<\/strong><\/a><\/span><span style=\"font-weight: 400;\"><strong>.<\/strong> <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Its distinctive low, wide shape and extended support surface provide high <\/span><span style=\"font-weight: 400;\">stability and make installation easier<\/span><span style=\"font-weight: 400;\">. <\/span><span style=\"font-weight: 400;\">However, <strong>correct installation requires strict compliance with precise dimensional and structural criteria<\/strong> concerning the supporting foundation and the drilling and fitting methods used on the shaped walls<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Failure to observe these installation requirements can cause abnormal flexing of the polymer, <\/span><span style=\"font-weight: 400;\">triggering mechanical stress on the base and leak points near the threaded fittings<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Preparing the support foundation<\/span><span style=\"font-weight: 400;\">: <\/span><span style=\"font-weight: 400;\">mechanical and flatness requirements\u00a0<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The flat-bottom tank distributes the load of the stored fluid over a large horizontal surface. Since <\/span><span style=\"font-weight: 400;\"><strong>water density<\/strong> corresponds to<strong> a load of 1000 kg\/m3 (1 kg\/dm3)<\/strong>, a full tank exerts constant, uniform <\/span><span style=\"font-weight: 400;\">pressure on the surface beneath it.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The support foundation must meet the following specifications:\u00a0<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\"><strong>The support surface<\/strong> must be built in <strong>reinforced concrete<\/strong>, perfectly levelled, <strong>smooth and free of depressions or irregularities that could concentrate stress<\/strong> at single points of the polymer <\/span><span style=\"font-weight: 400;\">matrix.\u00a0<\/span><\/li>\n<li><span style=\"font-weight: 400;\"><strong>Flatness tolerance<\/strong> must not exceed <strong>2 mm per linear metre<\/strong><\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">in order to prevent deformation <\/span><span style=\"font-weight: 400;\">of the shaped base under hydrostatic load<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/li>\n<li><span style=\"font-weight: 400;\"><strong>The dimensions of the concrete slab<\/strong> must exceed the tank&#8217;s footprint diameter by at least <\/span><span style=\"font-weight: 400;\">10-15 cm on each side<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">preventing overhang or flexing of the perimeter edges.\u00a0<\/span><\/li>\n<\/ul>\n<p><strong>It is strictly forbidden to place the tank directly on uneven ground<\/strong><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">loose gravel<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">wooden sleepers or pallets. Any settling of the ground would cause the polyethylene to bulge<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">leading to fatigue cracking <\/span><span style=\"font-weight: 400;\">of the material.\u00a0<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Hydraulic connections and drilling of the shaped walls\u00a0<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The geometry of flat-bottom tanks features flat areas alternating with structural reinforcement ribs. Correctly applying flanged joints or threaded bulkhead fittings requires care in selecting the drilling <\/span><span style=\"font-weight: 400;\">points.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Fittings must be installed exclusively on the flat areas provided by the manufacturer during the rotational moulding process. <strong>Drilling holes<\/strong> on reinforcement ribs or areas with a <strong>reduced curvature <\/strong><\/span><strong>radius prevents proper adhesion of the EPDM or NBR sealing gaskets<\/strong><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">causing leaks that cannot be resolved simply by mechanical tightening.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For connections to the water network and other fittings, flexible piping sections or rubber anti- <\/span><span style=\"font-weight: 400;\">vibration joints must be fitted near the tank&#8217;s inlet and outlet<\/span><span style=\"font-weight: 400;\">. <\/span><span style=\"font-weight: 400;\"><strong>Rigid PVC or polypropylene pipes subject<\/strong> to thermal expansion or slight structural settling <strong>could exert a reinforced bending moment <\/strong><\/span><span style=\"font-weight: 400;\"><strong>on the brass or plastic nipples<\/strong>, damaging the thread or tearing the tank wall.\u00a0<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Maintenance guidelines and technical support\u00a0<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Before final filling, it is recommended to carry out a visual hydraulic test, keeping the tank full for <strong>24 hours<\/strong> to check the seal of gaskets and fittings.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In the case of complex configurations or doubts regarding the compatibility of the fittings to be <\/span><span style=\"font-weight: 400;\">applied to the shaped walls<\/span><span style=\"font-weight: 400;\">, <\/span><a href=\"https:\/\/www.di-camillo.com\/en\/contacts\/\" target=\"_blank\" rel=\"noopener\"><strong>Di Camillo&#8217;s technical support provides the necessary assistance and suitable components, as well as on-site installation to ensure a perfect seal and system compliance. <\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the hydraulic and civil plant engineering sector, the flat-bottom (&#8220;panettone&#8221;) high-density polyethylene (HDPE) tank is a frequent choice for&#8230;<\/p>\n","protected":false},"author":4,"featured_media":829,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-4059","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-categorizzato"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - 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