{"id":9180,"date":"2025-09-19T06:52:01","date_gmt":"2025-09-19T09:52:01","guid":{"rendered":"https:\/\/waterpro-trainings.com\/?page_id=9180"},"modified":"2025-09-20T17:27:02","modified_gmt":"2025-09-20T20:27:02","slug":"high-pressure-pump-material-selection-in-ro-systems-design","status":"publish","type":"page","link":"https:\/\/waterpro-trainings.com\/?page_id=9180","title":{"rendered":"High Pressure Pump Material Selection in RO systems Design"},"content":{"rendered":"\t\t
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Selecting High-Pressure Pumps in RO Design Based on Feed Water TDS<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Introduction<\/span><\/strong><\/span><\/h2>

Choosing the high-pressure (HP)<\/strong> pump in reverse osmosis (RO)<\/strong> design based on the total dissolved solids (TDS)<\/strong> of the feed water is a critical\u00a0<\/span>aspect of the system design.\u00a0<\/span><\/p>

The TDS affects the osmotic pressure<\/strong>, which in turn influences the required operating pressure of the pump.<\/span><\/p>

Key Considerations:<\/span><\/strong><\/span><\/h2>
  • Osmotic Pressure and Feed Water TDS<\/span><\/li>
  • Operating Pressure\u00a0<\/span><\/li>
  • Pump Selection Based on TDS<\/span><\/li>
  • Flow and Recovery Rate<\/span><\/li>
  • Pump Efficiency and Energy Recovery<\/span><\/li>
  • Material Considerations<\/span><\/li><\/ul>

    \u00a0<\/span><\/p>

    1. The osmotic pressure (\u03c0)\u00a0<\/span><\/strong><\/h3>

    increases with higher TDS. It is calculated using this formula:<\/span><\/p>

    \u00a0<\/span><\/p>

    \u03c0 = 0.0831 \u00d7 T \u00d7 TDS<\/span><\/strong><\/span><\/p>

    Whereas:<\/span><\/p>

    T<\/span> =<\/span><\/strong>\u00a0The temperature in Kelvin\u00a0<\/span><\/p>

    TDS<\/span> =<\/span><\/strong>\u00a0Total Dissolved Solids in mg\/L.<\/span><\/p>

    0.0831<\/span> =<\/span><\/strong>\u00a0derived from the universal gas constant<\/span><\/p>

    \u00a0<\/span><\/p>

    2. Operating Pressure:<\/span><\/strong><\/h3>

    \u00a0<\/span><\/strong><\/p>

    The HP pump must overcome:\u00a0<\/span><\/p>

    • the osmotic pressure\u00a0<\/span><\/li>
    • The pressure drops across the membranes\u00a0<\/span><\/li>
    • The pressure drops across the piping<\/span><\/li><\/ul>

      Brackish Water RO:<\/b><\/span> Typical pressures range from 100-300 psi (6.9-20.7 bar) depending on TDS.\u00a0<\/span><\/p>

      Seawater RO:<\/b><\/span> Typical pressures range from 800-1,200 psi (55-83 bar) due to higher osmotic pressure.<\/span><\/p>

      3. Pump Selection Based on TDS\u00a0<\/span><\/h3>

      Brackish Water RO (TDS <10,000 mg\/L):<\/span><\/p>

      – Pumps with moderate pressure capabilities (100\u2013300 psi) are suitable.<\/span><\/p>

      – Energy efficiency and flow rate are key parameters.<\/span><\/p>

      Seawater RO (TDS >30,000 mg\/L):<\/span><\/p>

      – Pumps with high-pressure capabilities (up to 1,200 psi) are needed.<\/span><\/p>

      \u00a0<\/span><\/h3>

      4. Flow and Recovery Rate, Pump Efficiency, and Energy Recovery\u00a0<\/span><\/strong><\/span><\/h3>

      The required pump flow rate depends on:\u00a0<\/span><\/p>

      1- system recovery rate\u00a0<\/span><\/p>

      2- feed flow.\u00a0<\/span><\/p>

      • Higher TDS feed water usually implies a lower recovery rate to prevent scaling and fouling.<\/span><\/span><\/li>
      • HP pumps must be capable of handling the required feed flow at the system’s design recovery.\u00a0<\/span><\/li><\/ul>

        \u00a0<\/span><\/p>

        5. Material Considerations\u00a0<\/span><\/strong><\/h3>

        Pumps handling high-TDS water require corrosion-resistant materials like stainless steel (316L or duplex stainless steel) to withstand the corrosive environment.

        <\/span><\/p>

        Summary of Guidelines<\/span><\/strong>
        \u00a0<\/span><\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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        TDS (mg\/L)<\/strong><\/p><\/td>

        Typical Application<\/strong><\/p><\/td>

        Operating Pressure<\/strong><\/p>

        (psi)<\/span> | (Bar)<\/strong><\/p><\/td>

        Pump Material<\/strong><\/p><\/td>

        Energy Recovery<\/strong><\/p><\/td><\/tr>

        <1,000<\/span><\/p><\/td>

        Tap Water<\/span><\/p><\/td>

        5-150\u00a0<\/span>| 3.5 – 10<\/span><\/p><\/td>

        Standard Materials<\/span><\/p><\/td>

        None<\/span><\/p><\/td><\/tr>

        1,000 to 10,000<\/span><\/p><\/td>

        Brackish Water<\/span><\/p><\/td>

        100-300\u00a0<\/span>| 7 – 20<\/span><\/p><\/td>

        Stainless Steel (304\/316L)<\/span><\/p><\/td>

        Sometimes<\/span><\/p><\/td><\/tr>

        > 30,000<\/span><\/p><\/td>

        Sea Water<\/span><\/p><\/td>

        800-1200\u00a0<\/span>| 55 – 83<\/span><\/p><\/td>

        Duplex- Super (*)<\/span><\/p><\/td>

        Essential<\/span><\/p><\/td><\/tr><\/tbody><\/table>

        * S.S 904L – (UNS N08904)<\/span><\/p>

        \u00a0<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

        Selecting High-Pressure Pumps in RO Design Based on Feed Water TDS Introduction Choosing the high-pressure (HP) pump in reverse osmosis (RO) design based on the total dissolved solids (TDS) of the feed water is a critical\u00a0aspect of the system design.\u00a0 The TDS affects the osmotic pressure, which in turn influences the required operating pressure of […]<\/p>\n","protected":false},"author":1,"featured_media":9192,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_canvas","meta":{"site-sidebar-layout":"no-sidebar","site-content-layout":"page-builder","ast-site-content-layout":"full-width-container","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":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","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":"set","ast-page-background-enabled":"default","ast-page-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":"","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-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":"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":""},"mobile":{"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":""}},"footnotes":""},"class_list":["post-9180","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/waterpro-trainings.com\/index.php?rest_route=\/wp\/v2\/pages\/9180","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/waterpro-trainings.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/waterpro-trainings.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/waterpro-trainings.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/waterpro-trainings.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=9180"}],"version-history":[{"count":85,"href":"https:\/\/waterpro-trainings.com\/index.php?rest_route=\/wp\/v2\/pages\/9180\/revisions"}],"predecessor-version":[{"id":9288,"href":"https:\/\/waterpro-trainings.com\/index.php?rest_route=\/wp\/v2\/pages\/9180\/revisions\/9288"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/waterpro-trainings.com\/index.php?rest_route=\/wp\/v2\/media\/9192"}],"wp:attachment":[{"href":"https:\/\/waterpro-trainings.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9180"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}