{"id":4983,"date":"2025-09-25T14:53:17","date_gmt":"2025-09-25T06:53:17","guid":{"rendered":"https:\/\/stark-water.com\/?p=4983"},"modified":"2026-03-31T17:45:32","modified_gmt":"2026-03-31T09:45:32","slug":"membrangehause","status":"publish","type":"post","link":"https:\/\/stark-water.com\/de\/blog\/membrangehause\/","title":{"rendered":"Lebensmittelgeeignetes Edelstahl-Membrangeh\u00e4use: Schwei\u00dfen, Hygienedesign und Konformit\u00e4t"},"content":{"rendered":"<p>Food grade <a href=\"https:\/\/baike.baidu.com\/item\/%E4%B8%8D%E9%94%88%E9%92%A2%E8%86%9C%E5%A3%B3\/1465352\" target=\"_blank\" rel=\"noopener\">Membrangeh\u00e4use<\/a> is a sanitary, food-contact pressure vessel designed for hygienic service in dairy, beverage, flavors and nutraceuticals. It combines 316L construction, ASME BPE finishes (SF1\/SF4), orbital TIG with verified purge, and FDA\/EU-compliant gaskets to ensure cleanability across CIP\/SIP cycles.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1) Regulatory &amp; Standards Map (What \u201cFood-Grade\u201d Really Means)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Food-contact framework<\/strong>&nbsp;\u2014 EU 1935\/2004; US FDA food-contact rules (gaskets\/elastomers under 21 CFR 177.2600).<\/li>\n\n\n\n<li><strong>Hygienic design<\/strong>&nbsp;\u2014 3-A Sanitary Standards \/ EHEDG hygienic design principles for crevice-free, drainable, cleanable construction.<\/li>\n\n\n\n<li><strong>Surface &amp; fabrication<\/strong>&nbsp;\u2014 ASME BPE finish classes (e.g., SF1\/SF4) and orbital-weld best practices for smooth, fully penetrated, purge-protected welds.<\/li>\n\n\n\n<li><strong>Materials &amp; documents<\/strong>&nbsp;\u2014 ASTM A270 (sanitary tube), ASTM A967 (passivation), EN 10204 3.1 MTR traceability, pressure test &amp; QA dossier on shipment.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/stark-water.com\/wp-content\/uploads\/2025\/07\/1705482722_Stainless-Steel-Membrane-Shell-Welding-Process-1.jpg\" alt=\"food grade membrane housing orbital TIG weld on 316L\" title=\"\"><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">2) Food Grade Membrane Housing Materials &amp; Surface Finish (Cleanability First)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Base metal<\/strong>: default&nbsp;<a href=\"https:\/\/stark-water.com\/de\/produkt-kategorie\/produkte-aus-rostfreiem-stahl\/patronenfiltergehause\/\"><strong>SS 316L<\/strong>&nbsp;<\/a>(Mo-alloyed, better chloride resistance) with low-carbon grade to reduce sensitization risk; SS 304 available for low-chloride utilities.<\/li>\n\n\n\n<li><strong>Internal finish options<\/strong>:\n<ul class=\"wp-block-list\">\n<li><strong>SF1<\/strong>: Ra \u2264 0.51 \u03bcm (mechanically polished), economical for standard food service.<\/li>\n\n\n\n<li><strong>SF4<\/strong>: Ra \u2264 0.38 \u03bcm (electropolished), preferred for stringent hygiene and reduced biofilm risk.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Post-weld treatment<\/strong>: heat-tint removal +&nbsp;<strong>chemical passivation (ASTM A967)<\/strong>&nbsp;to restore the chromium-rich passive layer.<\/li>\n\n\n\n<li><strong>Gaskets &amp; seals<\/strong>: FDA-compliant&nbsp;<strong>EPDM\/FKM\/PTFE\/Silicone<\/strong>&nbsp;as specified by media, temperature, and CIP\/SIP chemistry; lubricants use NSF H1-grade only.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">3) Welding for Sanitary Service (Orbital GTAW + Verified Purge)<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Process<\/strong>: orbital GTAW\/TIG with internal purge to protect root; weld maps maintained against serial numbers.<\/li>\n\n\n\n<li><strong>Welder qualification<\/strong>: per&nbsp;<strong>ISO 9606-1<\/strong>; WPS\/PQR on file and available in the documentation pack.<\/li>\n\n\n\n<li><strong>Inspection<\/strong>: borescope images for every circumferential weld; dye-penetrant where applicable; ferrite checks on welds if specified.<\/li>\n\n\n\n<li><strong>Finishing<\/strong>: mechanical blend where needed without undercut; electropolish option to reach SF4.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/stark-water.com\/wp-content\/uploads\/2025\/07\/1705482745_Stainless-Steel-Membrane-Shell-Welding-Process-2.jpg\" alt=\"\" title=\"\"><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">4) Hygienic Geometry &amp; Connections (Drainable, Crevice-Free)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>No dead legs<\/strong>: \u201cdead-leg length \u2264 2\u00d7 branch diameter\u201d design rule for ports and gauges.<\/li>\n\n\n\n<li><strong>Full drainability<\/strong>: housing oriented with slope \u2265 1% toward sanitary drain; end caps designed to avoid product traps.<\/li>\n\n\n\n<li><strong>Verbindungen<\/strong>: sanitary tri-clamp ferrules as default; dairy ends, DIN\/ISO clamp, or RJT on request.<\/li>\n\n\n\n<li><strong>Cleanability<\/strong>: rib-free seals, uniform compression, and gasket intrusion control to ensure repeatable CIP.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">5) QA\/QC &amp; Validation Dossier (What You Receive)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Material traceability<\/strong>: EN 10204&nbsp;<strong>3.1 MTR<\/strong>&nbsp;for major wetted components.<\/li>\n\n\n\n<li><strong>Surface verification<\/strong>: Ra test records (critical areas), electropolish certificate if SF4 specified.<\/li>\n\n\n\n<li><strong>Weld quality<\/strong>: welder quals, WPS\/PQR, weld map + borescope photo log.<\/li>\n\n\n\n<li><strong>Pressure integrity<\/strong>: hydrostatic test report at 1.5\u00d7 design pressure; leak test before shipment.<\/li>\n\n\n\n<li><strong>Compliance pack<\/strong>: FDA\/EU compliance declarations for gaskets\/seals, passivation certificate (ASTM A967), and cleaning recommendations (CIP\/SIP).<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">6) CIP\/SIP Compatibility (Typical Ranges)<\/h2>\n\n\n\n<p>Compatible with alkaline\/acid CIP (e.g., NaOH 0.5\u20132.0%, HNO\u2083\/H\u2083PO\u2084 0.5\u20131.0%) and SIP up to 121\u2013135 \u00b0C depending on gasket selection. We provide media-specific limits and elastomer compatibility tables in the QA pack.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/stark-water.com\/wp-content\/uploads\/2025\/07\/1705482771_Stainless-Steel-Membrane-Shell-Welding-Process-3.jpg\" alt=\"\" title=\"\"><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">) Standard Food-Grade Membrane Housing Specs<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Modell<\/th><th>Element<\/th><th>Material<\/th><th>Internal Finish<\/th><th>Verbindungen<\/th><th>Design Pressure<\/th><th>CIP\/SIP<\/th><th>Dokumentation<\/th><\/tr><\/thead><tbody><tr><td>SW-Sani-4040<\/td><td>4\u2033 \u00d7 40\u2033<\/td><td>SS 316L (wetted), 304 shell optional<\/td><td>SF1 (Ra \u22640.51 \u03bcm) or SF4 (Ra \u22640.38 \u03bcm, EP)<\/td><td>Tri-clamp ferrules, 1.5\u2033 \/ 2.0\u2033<\/td><td>300 psi (2.07 MPa) standard; higher by request<\/td><td>CIP up to 85 \u00b0C; SIP up to 121\u2013135 \u00b0C*<\/td><td>3.1 MTR, Ra report, hydrotest, passivation cert, gasket FDA\/EU CoC<\/td><\/tr><tr><td>SW-Sani-8040<\/td><td>8\u2033 \u00d7 40\u2033<\/td><td>SS 316L (wetted), 304 shell optional<\/td><td>SF1 or SF4<\/td><td>Tri-clamp ferrules, 2.0\u2033 \/ 2.5\u2033<\/td><td>300\u2013450 psi (2.07\u20133.10 MPa) per design<\/td><td>CIP\/SIP as above*<\/td><td>Same as above + borescope photo log<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>*Final limits depend on selected elastomer (EPDM\/FKM\/PTFE\/Silicone) and cleaning chemistry.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/stark-water.com\/wp-content\/uploads\/2025\/07\/1705482802_Stainless-Steel-Membrane-Shell-Welding-Process-4.jpg\" alt=\"\" title=\"\"><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">8) RFQ Checklist (Copy &amp; Paste to Your Inquiry)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Process media &amp; target product (e.g., dairy permeate, juice concentrate, flavors)<\/li>\n\n\n\n<li>Max temperature \/ pressure, cyclic profile, and design code requirements<\/li>\n\n\n\n<li>Surface finish target: SF1 or SF4 (internal); external cosmetic grade if needed<\/li>\n\n\n\n<li>Connection type &amp; size: tri-clamp \/ DIN \/ ISO \/ RJT; drain orientation<\/li>\n\n\n\n<li>Gasket choice: EPDM \/ FKM \/ PTFE \/ Silicone + required compliance (FDA\/EU)<\/li>\n\n\n\n<li>CIP\/SIP regime &amp; chemicals; required cleanability tests (e.g., riboflavin optional)<\/li>\n\n\n\n<li>Documentation pack: 3.1 MTR, Ra map, hydrotest, weld dossier, passivation cert<\/li>\n\n\n\n<li>Packaging &amp; labels: cleanroom poly-bagging \/ desiccant \/ palletization spec<\/li>\n<\/ul>\n\n\n\n<p>Send the checklist to&nbsp;<a href=\"https:\/\/stark-water.com\/de\/contact-us\/\">Starkes Wasser<\/a>&nbsp;and we\u2019ll return a design + quote within one business day.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/stark-water.com\/wp-content\/uploads\/2025\/07\/1705482835_Stainless-Steel-Membrane-Shell-Welding-Process.jpg\" alt=\"\" title=\"\"><\/figure>\n\n\n\n<section id=\"faq\">\n    <h2>9) FAQ<\/h2>\n    <details>\n      <summary>304 vs 316L for food membrane housings?<\/summary>\n      <p>Both are food-contact suitable; 316L (Mo-alloy) offers better pitting resistance under chloride and hot CIP, making it the default for dairy\/beverage. 304 is acceptable for low-chloride utilities and budget-sensitive projects.<\/p>\n    <\/details>\n    <details>\n      <summary>Do you provide electropolishing for SF4?<\/summary>\n      <p>Yes. We can electropolish the entire internal wetted surface and issue an Ra report meeting SF4 (Ra \u22640.38 \u03bcm), plus a passivation certificate.<\/p>\n    <\/details>\n    <details>\n      <summary>What proof of \u201cfood-grade\u201d do I get?<\/summary>\n      <p>Gasket FDA\/EU compliance declarations, EN 10204 3.1 MTRs, surface roughness reports, hydrostatic test, welding dossier (ISO 9606-1-qualified welders), and passivation per ASTM A967.<\/p>\n    <\/details>\n  <\/section>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>In the intricate landscape of membrane technology, the Stainless Steel Membrane Shell Welding Process emerges as a pivotal innovation, combining precision engineering with the durability of stainless steel. \u00a0<\/p>","protected":false},"author":1,"featured_media":4997,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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