{"id":57899,"date":"2025-10-24T15:49:07","date_gmt":"2025-10-24T07:49:07","guid":{"rendered":"https:\/\/stark-water.com\/?p=57899"},"modified":"2025-10-24T15:49:10","modified_gmt":"2025-10-24T07:49:10","slug":"reverse-osmosis-winterization-guide","status":"publish","type":"post","link":"https:\/\/stark-water.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/reverse-osmosis-winterization-guide\/","title":{"rendered":"\u9006\u6d78\u900f\u819c\u306e\u51ac\u5bfe\u7b56 - \u51cd\u7d50\u9632\u6b62\u3068\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u306e\u5b8c\u5168\u30ac\u30a4\u30c9"},"content":{"rendered":"<p>This reverse osmosis winterization guide shows exactly how to protect an RO plant through freezing weather\u2014whether you keep it running, idle it overnight, or mothball it for the season. You\u2019ll get a 12-step checklist, drainage map, membrane preservation options, and safe-restart verification to minimize damage, downtime, and salt-passage excursions.<\/p>\n\n\n\n<p><strong>At-a-glance (why it matters):<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ice expands ~9% and can crack RO housings, valves and gauges in hours.<\/li>\n\n\n\n<li>Most failures occur at low points, small lines (sample ports\/PRV capillaries) and outdoor runs.<\/li>\n\n\n\n<li>Reverse osmosis winterization = temperature control + drainage + membrane preservation + safe restart checks.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/stark-water.com\/wp-content\/uploads\/2025\/10\/reverse-osmosis-winterization2-1024x683.webp\" alt=\"reverse osmosis winterization2\" class=\"wp-image-57916\" title=\"\" srcset=\"https:\/\/stark-water.com\/wp-content\/uploads\/2025\/10\/reverse-osmosis-winterization2-1024x683.webp 1024w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/10\/reverse-osmosis-winterization2-300x200.webp 300w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/10\/reverse-osmosis-winterization2-768x512.webp 768w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/10\/reverse-osmosis-winterization2-18x12.webp 18w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/10\/reverse-osmosis-winterization2-600x400.webp 600w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/10\/reverse-osmosis-winterization2.webp 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">reverse osmosis winterization2<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"modes\">1) Choose your winter mode<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Operating<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Keep room temp \u22655&nbsp;\u00b0C; seal doors, fix drafts.<\/li>\n\n\n\n<li>Verify heat-trace\/insulation on raw feed, concentrate, drains, vent lines; log amps.<\/li>\n\n\n\n<li>Night strategy: low-flow recirculation to avoid cold stagnation.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Idle (overnight\/weekend)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Warm room, keep low-flow bypass&nbsp;<em>\u307e\u305f\u306f<\/em>&nbsp;drain exposed low points.<\/li>\n\n\n\n<li>Disable auto-starts; lockout if freezing risk overnight.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Seasonal storage<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Full drain &amp; blow-down; membrane wet- or dry-storage; chemical day-tanks empty.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"matrix\">2) Reverse osmosis winterization decision matrix<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Ambient condition<\/th><th>Operating<\/th><th>Idle \u226448h<\/th><th>Seasonal storage<\/th><\/tr><\/thead><tbody><tr><td>\u2265 5&nbsp;\u00b0C (41&nbsp;\u00b0F)<\/td><td>Run normally; verify room temp logs; insulate cold drafts.<\/td><td>Keep recirc 0.2\u20130.4&nbsp;m\/s or drain only exposed stubs.<\/td><td>Optional; prefer wet storage if room stays above freezing.<\/td><\/tr><tr><td>0\u20265&nbsp;\u00b0C (32\u201341&nbsp;\u00b0F)<\/td><td>Run with heat-trace live; check low points daily.<\/td><td>Drain all low points; disable auto-start; lockout pumps.<\/td><td>Wet storage with ~1% SBS; room must remain &gt;0&nbsp;\u00b0C.<\/td><\/tr><tr><td>&lt; 0&nbsp;\u00b0C (&lt;32&nbsp;\u00b0F)<\/td><td>Strongly avoid idle stops; keep recirc; verify alarms.<\/td><td>Full drain &amp; blow-down; crack vents; tag status.<\/td><td>Dry storage (air-purge &amp; cap) or relocate to heated room.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"twelve-steps\">3) 12-step reverse osmosis winterization procedure<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Lockout\/tagout<\/strong>&nbsp;MCCs and chemical dosing as required.<\/li>\n\n\n\n<li><strong>Record baselines<\/strong>: feed\/permeate\/concentrate flows, \u0394P by stage, salt passage vs. permeate temperature.<\/li>\n\n\n\n<li><strong>Clean in place (if due)<\/strong>&nbsp;to reduce biofouling prior to storage.<\/li>\n\n\n\n<li><strong>Flush to permeate<\/strong>: low-pressure flush so housings hold permeate, not concentrated brine.<\/li>\n\n\n\n<li><strong>Drain low points<\/strong>&nbsp;in this order: prefilters \u2192 RO housings \u2192 interstage lines \u2192 final filters \u2192 drains\/vents.<\/li>\n\n\n\n<li><strong>Air blow-down<\/strong>: regulate to &lt;0.3&nbsp;MPa; blow from high to low while drains are open.<\/li>\n\n\n\n<li><strong>Open vents\/manways<\/strong>&nbsp;on MMF, carbon, softeners; drain chemical day-tanks and tubing.<\/li>\n\n\n\n<li><strong>Membrane preservation<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Rooms &gt;0&nbsp;\u00b0C: wet-store with ~1% sodium bisulfite (SBS). Confirm free chlorine = 0 before dosing.<\/li>\n\n\n\n<li>Sub-freezing: dry storage\u2014drain, air-purge, cap vessels, label and log serials.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Pressure release<\/strong>&nbsp;on accumulators; remove gauge columns where freezing is likely.<\/li>\n\n\n\n<li><strong>Heat-trace &amp; insulation audit<\/strong>: verify breakers, GFCIs, amp draw, labels and coverage on drains and vents.<\/li>\n\n\n\n<li><strong>Room controls<\/strong>: set thermostats \u22655&nbsp;\u00b0C; add temp data loggers with alarms.<\/li>\n\n\n\n<li><strong>\u30c9\u30ad\u30e5\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3<\/strong>: update P&amp;IDs; tag every drained\/isolated component; capture photos.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/stark-water.com\/wp-content\/uploads\/2025\/10\/reverse-osmosis-winterization3.webp\" alt=\"reverse osmosis winterization3\" class=\"wp-image-57919\" title=\"\" srcset=\"https:\/\/stark-water.com\/wp-content\/uploads\/2025\/10\/reverse-osmosis-winterization3.webp 1024w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/10\/reverse-osmosis-winterization3-300x300.webp 300w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/10\/reverse-osmosis-winterization3-150x150.webp 150w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/10\/reverse-osmosis-winterization3-768x768.webp 768w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/10\/reverse-osmosis-winterization3-12x12.webp 12w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/10\/reverse-osmosis-winterization3-600x600.webp 600w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/10\/reverse-osmosis-winterization3-100x100.webp 100w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">reverse osmosis winterization3<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"restart\">4) Thawing and safe restart<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Warm equipment to \u226510&nbsp;\u00b0C;&nbsp;<em>no open flames or steam shocks<\/em>.<\/li>\n\n\n\n<li>Inspect housings, O-rings, gauges, sight-glasses, valves for cracks or leaks; replace as needed.<\/li>\n\n\n\n<li>Refill, purge air, and ramp slowly while watching \u0394P by stage.<\/li>\n\n\n\n<li>Verify performance: compare flows, \u0394P and salt passage vs. baseline; only then go to design recovery.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"checklists\">5) Drain &amp; verification checklists<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Component<\/th><th>Drain\/vent point<\/th><th>Tag<\/th><th>Status<\/th><\/tr><\/thead><tbody><tr><td>5&nbsp;\u00b5m prefilter (cartridge)<\/td><td>Bottom bowl drain<\/td><td>PF-D1<\/td><td>\u25a1 Opened \u25a1 Closed<\/td><\/tr><tr><td>RO vessel train<\/td><td>Each end cap &amp; center drain<\/td><td>RO-D*<\/td><td>\u25a1 Purged with air \u25a1 Capped<\/td><\/tr><tr><td>Interstage line<\/td><td>Lowest tee drain<\/td><td>IS-D1<\/td><td>\u25a1 Drained<\/td><\/tr><tr><td>Final filter\/polisher<\/td><td>Housing drain + vent<\/td><td>FF-D1<\/td><td>\u25a1 Drained<\/td><\/tr><tr><td>Concentrate\/vent lines<\/td><td>Line-end drip leg<\/td><td>CL-D1<\/td><td>\u25a1 Drained<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Metric<\/th><th>\u30d9\u30fc\u30b9\u30e9\u30a4\u30f3<\/th><th>Post-restart<\/th><th>Pass\/Fail<\/th><\/tr><\/thead><tbody><tr><td>Permeate flow (m\u00b3\/h)<\/td><td>__<\/td><td>__<\/td><td>\u25a1<\/td><\/tr><tr><td>Stage-1 \u0394P \/ Stage-2 \u0394P (bar)<\/td><td>__\/__<\/td><td>__\/__<\/td><td>\u25a1<\/td><\/tr><tr><td>Salt passage (%) @ temp-corrected<\/td><td>__<\/td><td>__<\/td><td>\u25a1<\/td><\/tr><tr><td>Leaks\/visual damage<\/td><td>-<\/td><td>__<\/td><td>\u25a1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"ops\">6) Daily &amp; weekly winter ops<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Room temp logs (min\/max) and heat-trace amperage check.<\/li>\n\n\n\n<li>Low-point drain inspection and vent icing check.<\/li>\n\n\n\n<li>Chemical levels (SBS\/antiscalant) and alarm tests.<\/li>\n\n\n\n<li>Gasket\/seal walk-down after first hard freeze and first thaw.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"bom\">7) Bill of materials<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Heat-trace cable &amp; controllers, fiberglass or elastomeric insulation, weatherproof jacketing.<\/li>\n\n\n\n<li>Non-contact IR thermometer; temp data loggers with alarms.<\/li>\n\n\n\n<li>Regulated compressed-air kit for blow-down; tags\/labels.<\/li>\n\n\n\n<li>Sodium bisulfite (SBS) for wet storage; site-approved cleaners for CIP.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"pitfalls\">8) Common mistakes &amp; fast fixes<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Inadequate dechlorination<\/strong>&nbsp;\u2192 membrane oxidation: raise SBS at static mixer, verify residence and zero free Cl\u2082 before preservation.<\/li>\n\n\n\n<li><strong>Dead legs\/reverse slopes<\/strong>&nbsp;\u2192 redesign tees, enforce 1\u20132% slope, add drains at drip legs.<\/li>\n\n\n\n<li><strong>CO\u2082 depresses resistivity<\/strong>&nbsp;after restart \u2192 add degassing\/conditioning interstage or hold for stabilization.<\/li>\n\n\n\n<li><strong>TOC\u30af\u30ea\u30fc\u30d7<\/strong>&nbsp;\u2192 sanitize (UV\/185 or hot water where compatible) and refresh cadence.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"compliance\">9) Compliance &amp; references<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.astm.org\/d1193-21.html\" target=\"_blank\" rel=\"noreferrer noopener\">ASTM D1193<\/a>&nbsp;classes for reagent water (design targets &amp; verification).<\/li>\n\n\n\n<li><a href=\"https:\/\/www.wqa.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u6c34\u8cea\u5354\u4f1a\uff08WQA\uff09<\/a>&nbsp;resources for system qualification and sanitation.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"next\">10) Next steps (RFQ &amp; internal links)<\/h2>\n\n\n\n<p>Share your RO permeate analysis and demand curve\u2014we\u2019ll size heat-trace, drainage points, membrane storage method and a hygienic stainless-steel package.<\/p>\n\n\n\n<p><a href=\"https:\/\/stark-water.com\/ja\/request-a-quote\/\">\u898b\u7a4d\u4f9d\u983c<\/a><\/p>\n\n\n\n<p>Helpful internal references:&nbsp;<a href=\"https:\/\/stark-water.com\/ja\/%e9%80%86%e6%b5%b8%e9%80%8f%e8%86%9c%e3%81%ae%e3%83%88%e3%83%a9%e3%83%96%e3%83%ab%e3%82%b7%e3%83%a5%e3%83%bc%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0\/\">RO troubleshooting<\/a>&nbsp;-&nbsp;<a href=\"https:\/\/stark-water.com\/ja\/di-water-storage-tank-loop-design\/\">DI storage tank &amp; loop design<\/a>&nbsp;-&nbsp;<a href=\"https:\/\/stark-water.com\/ja\/edi-vs-mixed-bed\/\">EDI vs mixed bed<\/a>&nbsp;-&nbsp;<a href=\"https:\/\/stark-water.com\/ja\/product-category\/%e3%82%b9%e3%83%86%e3%83%b3%e3%83%ac%e3%82%b9%e8%a3%bd%e5%93%81\/\">Stainless steel tanks &amp; housings<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"\/media\/ro-winterization-matrix.webp\" alt=\"Reverse osmosis winterization decision table for operating, idle and storage modes\" title=\"\"><figcaption class=\"wp-element-caption\">Decision matrix: temperature bands \u00d7 operating mode \u2192 actions.<\/figcaption><\/figure>\n\n\n\n<p>\u00a9 Stark Water \u2022 Engineering content for industrial readers. This page covers reverse osmosis winterization practices; always follow your OEM and site procedures.<\/p>","protected":false},"excerpt":{"rendered":"<p>This reverse osmosis winterization guide shows exactly how to protect an RO plant through freezing weather\u2014whether you keep it running, [&hellip;]<\/p>","protected":false},"author":1,"featured_media":57912,"comment_status":"closed","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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_joinchat":[],"footnotes":""},"categories":[208],"tags":[],"class_list":["post-57899","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industrial-water-treatment-guides"],"acf":[],"_links":{"self":[{"href":"https:\/\/stark-water.com\/ja\/wp-json\/wp\/v2\/posts\/57899","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stark-water.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stark-water.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stark-water.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stark-water.com\/ja\/wp-json\/wp\/v2\/comments?post=57899"}],"version-history":[{"count":4,"href":"https:\/\/stark-water.com\/ja\/wp-json\/wp\/v2\/posts\/57899\/revisions"}],"predecessor-version":[{"id":57923,"href":"https:\/\/stark-water.com\/ja\/wp-json\/wp\/v2\/posts\/57899\/revisions\/57923"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/stark-water.com\/ja\/wp-json\/wp\/v2\/media\/57912"}],"wp:attachment":[{"href":"https:\/\/stark-water.com\/ja\/wp-json\/wp\/v2\/media?parent=57899"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stark-water.com\/ja\/wp-json\/wp\/v2\/categories?post=57899"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stark-water.com\/ja\/wp-json\/wp\/v2\/tags?post=57899"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}