{"id":2956,"date":"2026-04-23T03:49:13","date_gmt":"2026-04-23T03:49:13","guid":{"rendered":"https:\/\/bbpmfg.com\/?page_id=2956"},"modified":"2026-04-23T05:45:52","modified_gmt":"2026-04-23T05:45:52","slug":"specific-speed-calculator","status":"publish","type":"page","link":"https:\/\/bbpmfg.com\/es\/irrigation-pumps\/mixed-flow-pump\/specific-speed-calculator\/","title":{"rendered":"Calculadora de velocidad espec\u00edfica"},"content":{"rendered":"\n<div class=\"wp-block-stackable-columns alignfull stk-block-columns stk-block stk-e182c35\" data-block-id=\"e182c35\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-e182c35-column alignfull\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-95f6085\" data-v=\"4\" data-block-id=\"95f6085\"><style>.stk-95f6085-container{margin-top:30px !important;margin-right:30px !important;margin-bottom:30px !important;margin-left:30px !important;}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-95f6085-container stk--no-background stk--no-padding\"><div class=\"has-text-align-center stk-block-content stk-inner-blocks stk-95f6085-inner-blocks\">\n<h1>Specific Speed Calculator<\/h1>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-columns alignfull stk-block-columns stk-block stk-a0421d2\" data-block-id=\"a0421d2\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-a0421d2-column alignfull\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-754e046\" data-v=\"4\" data-block-id=\"754e046\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-754e046-container stk--no-background stk--no-padding\"><div class=\"has-text-align-center stk-block-content stk-inner-blocks stk-754e046-inner-blocks\"><div class=\"ct-breadcrumbs\" data-source=\"rankmath\" ><nav aria-label=\"breadcrumbs\" class=\"rank-math-breadcrumb\"><p><span class=\"last\">Home<\/span><\/p><\/nav><\/div><\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-columns alignfull stk-block-columns stk-block stk-1e85c38\" data-block-id=\"1e85c38\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-1e85c38-column alignfull\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-ba32754\" data-v=\"4\" data-block-id=\"ba32754\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-ba32754-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-ba32754-inner-blocks\">\n<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n<meta charset=\"UTF-8\">\n<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n<title>Specific Speed Calculator \u2014 Pump Type Recommender | BBP<\/title>\n<meta name=\"description\" content=\"Enter flow, head, and RPM. Returns specific speed (Ns and ns), recommended impeller type (radial \/ mixed flow \/ axial), and BBP model class suggestion.\">\n<style>\n:root{--brand:#1848C0;--accent:#F0C018;--ink:#111827;--muted:#6B7280;--bg:#F8FAFC;--line:#E2E8F0}\n*{box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,\"Segoe UI\",Roboto,sans-serif;background:var(--bg);color:var(--ink);margin:0;padding:24px;line-height:1.6}\n.tool{max-width:780px;margin:0 auto;background:#fff;border-radius:16px;box-shadow:0 4px 16px rgba(15,23,42,.08);padding:32px}\nh1{font-size:26px;margin:0 0 6px;color:var(--brand)}\n\/* \u539f\u6709\u7684 H2 \u6837\u5f0f\uff0c\u7ee7\u7eed\u670d\u52a1\u4e8e Step 1 \u548c Step 2\uff0c\u4e0d\u53d7\u4e0b\u65b9\u5f71\u54cd *\/\nh2{font-size:18px;margin:24px 0 10px;color:var(--ink)}\np.lede{color:var(--muted);margin:0 0 22px;font-size:15px}\n.form-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:18px}\n.field label{display:block;font-size:13px;font-weight:600;color:var(--muted);margin-bottom:6px;text-transform:uppercase;letter-spacing:.04em}\n.field input,.field select{width:100%;padding:10px 12px;border:1.5px solid var(--line);border-radius:8px;font-size:15px;background:#fff}\n.field input:focus,.field select:focus{border-color:var(--brand);outline:none}\n.unit-tabs{display:flex;gap:8px;margin-bottom:14px}\n.unit-tabs button{flex:1;padding:9px;border:1.5px solid var(--line);background:#fff;border-radius:8px;cursor:pointer;font-size:14px;font-weight:600}\n.unit-tabs button.active{background:var(--brand);color:#fff;border-color:var(--brand)}\n.calc-btn{background:var(--brand);color:#fff;border:none;padding:13px 28px;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer;width:100%;margin-top:8px}\n.calc-btn:hover{background:#12369A}\n.result{margin-top:24px;background:var(--bg);border-left:4px solid var(--accent);padding:20px 24px;border-radius:8px;display:none}\n.result.show{display:block}\n\n\/* =========================================\n   \u65b0\u589e\uff1a\u7ed3\u679c\u533a\u57df\u7684 H2-H4 \u72ec\u7acb\u6807\u7b7e\u8bbe\u7f6e \n   ========================================= *\/\n\/* \u5c06\u52a8\u6001\u6570\u503c\u8bbe\u5b9a\u4e3a H2\uff0c\u5355\u72ec\u8bbe\u7f6e 32px\uff0c\u8986\u76d6\u5168\u5c40 h2 \u6837\u5f0f *\/\n.result h2.ns{font-size:32px;font-weight:800;color:var(--brand);line-height:1;margin:0 0 4px 0;}\n\/* \u5c06\u5c0f\u6807\u9898\u8bbe\u5b9a\u4e3a H3 *\/\n.result h3.ns-lbl{font-size:13px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin:0;font-weight:normal;}\n\/* \u5c06\u6c34\u6cf5\u63a8\u8350\u7c7b\u578b\u8bbe\u5b9a\u4e3a H4 *\/\n.rec h4.type{font-weight:700;color:var(--brand);font-size:16px;margin:0;}\n\n.rec{margin-top:18px;padding:16px;background:#fff;border-radius:8px;border:1px solid var(--line)}\n.rec ul{margin:10px 0 0;padding-left:20px;font-size:14px;color:var(--ink)}\n.rec li{margin-bottom:4px}\n.cta{margin-top:22px;text-align:center}\n.cta a{display:inline-block;background:var(--accent);color:var(--ink);padding:12px 24px;border-radius:8px;text-decoration:none;font-weight:700;font-size:15px}\n.disclaimer{font-size:12.5px;color:var(--muted);margin-top:14px;border-top:1px solid var(--line);padding-top:12px}\n@media(max-width:640px){.form-grid{grid-template-columns:1fr}}\n<\/style>\n<\/head>\n<body>\n<div class=\"tool\">\n<h1>Specific Speed Calculator<\/h1>\n<p class=\"lede\">Enter your duty point and operating speed. Returns specific speed in both US (Ns) and metric (ns), recommends the pump type, and maps to a BBP product class. Based on ANSI\/HI 14.1 and ISO 9906:2012 definitions.<\/p>\n\n<h2>Step 1 \u2014 Choose units<\/h2>\n<div class=\"unit-tabs\">\n  <button id=\"btn-us\" class=\"active\" onclick=\"setUnits('us')\">US Units (GPM \/ ft)<\/button>\n  <button id=\"btn-metric\" onclick=\"setUnits('metric')\">Metric (m\u00b3\/s \/ m)<\/button>\n<\/div>\n\n<h2>Step 2 \u2014 Enter duty point<\/h2>\n<div class=\"form-grid\">\n  <div class=\"field\">\n    <label id=\"lbl-q\">Flow Q (GPM)<\/label>\n    <input type=\"number\" id=\"q\" placeholder=\"1500\" step=\"any\">\n  <\/div>\n  <div class=\"field\">\n    <label id=\"lbl-h\">Head H (ft)<\/label>\n    <input type=\"number\" id=\"h\" placeholder=\"15\" step=\"any\">\n  <\/div>\n  <div class=\"field\">\n    <label>Speed n (RPM)<\/label>\n    <input type=\"number\" id=\"n\" placeholder=\"1450\" step=\"any\">\n  <\/div>\n<\/div>\n\n<button class=\"calc-btn\" onclick=\"calc()\">Calculate Specific Speed \u2192<\/button>\n\n<div class=\"result\" id=\"result\">\n  <h3 class=\"ns-lbl\">Specific Speed (US)<\/h3>\n  <h2 class=\"ns\" id=\"ns-us\">\u2014<\/h2>\n  \n  <h3 class=\"ns-lbl\" style=\"margin-top:10px\">Specific Speed (metric)<\/h3>\n  <h2 class=\"ns\" id=\"ns-metric\">\u2014<\/h2>\n  \n  <div class=\"rec\" id=\"rec\">\n    <h4 class=\"type\" id=\"rec-type\">\u2014<\/h4>\n    <div id=\"rec-desc\" style=\"font-size:14px;margin-top:4px;color:var(--muted)\"><\/div>\n    <ul id=\"rec-bbp\"><\/ul>\n  <\/div>\n  <div class=\"cta\">\n    <a href=\"#ct-popup-820\">Get a BBP quote for this duty \u2192<\/a>\n  <\/div>\n  <div class=\"disclaimer\">\n    Conversion: Ns = 51.6 \u00d7 ns. Reference: ANSI\/HI 14.1-14.2 (Rotodynamic Pumps for Nomenclature), ISO 9906:2012. Boundary values between impeller types are continuous \u2014 edge cases may fit either class depending on efficiency priority vs. NPSH constraints.\n  <\/div>\n<\/div>\n<\/div>\n\n<script>\nlet units='us';\nfunction setUnits(u){\n  units=u;\n  document.getElementById('btn-us').classList.toggle('active',u==='us');\n  document.getElementById('btn-metric').classList.toggle('active',u==='metric');\n  document.getElementById('lbl-q').textContent=u==='us'?'Flow Q (GPM)':'Flow Q (m\u00b3\/s)';\n  document.getElementById('lbl-h').textContent=u==='us'?'Head H (ft)':'Head H (m)';\n}\nfunction calc(){\n  const q=parseFloat(document.getElementById('q').value);\n  const h=parseFloat(document.getElementById('h').value);\n  const n=parseFloat(document.getElementById('n').value);\n  if(!q||!h||!n||q<=0||h<=0||n<=0){alert('Enter positive Q, H, and RPM.');return}\n  let ns_us, ns_metric;\n  if(units==='us'){\n    ns_us=n*Math.sqrt(q)\/Math.pow(h,0.75);\n    ns_metric=ns_us\/51.6;\n  }else{\n    ns_metric=n*Math.sqrt(q)\/Math.pow(h,0.75);\n    ns_us=ns_metric*51.6;\n  }\n  document.getElementById('ns-us').textContent=ns_us.toFixed(0);\n  document.getElementById('ns-metric').textContent=ns_metric.toFixed(1);\n  let type,desc,bbp;\n  if(ns_metric<35){\n    type='Radial Centrifugal';\n    desc='Low specific speed \u2014 radial closed impeller territory.';\n    bbp=['Not BBP Mixed Flow territory','Consider BBP end-suction or split-case pump series','Typical duty: 10\u2013200 m head, 5\u2013500 L\/s'];\n  }else if(ns_metric<160){\n    type='Mixed Flow (BBP sweet spot)';\n    desc='Semi-axial impeller \u2014 BBP Mixed Flow Series is designed for this range.';\n    bbp=['BBP Horizontal, Vertical, or Submersible Mixed Flow Series','Suction DN 150\u2013800 mm available','ISO 9906 Grade 2B tested'];\n  }else if(ns_metric<400){\n    type='Axial Flow (Propeller)';\n    desc='Very high specific speed \u2014 propeller pump territory.';\n    bbp=['Edge of BBP Mixed Flow upper limit','Consider axial-flow series for very low head duty','Watch power curve: axial pumps draw more power at low flow'];\n  }else{\n    type='Out of Range';\n    desc='Ns too high for rotodynamic pump \u2014 check inputs (speed may be too high, or head too low).';\n    bbp=['Verify your RPM, Q, and H inputs','Consult BBP engineering for non-standard duty'];\n  }\n  document.getElementById('rec-type').textContent=type;\n  document.getElementById('rec-desc').textContent=desc;\n  const ul=document.getElementById('rec-bbp');\n  ul.innerHTML='';\n  bbp.forEach(item=>{const li=document.createElement('li');li.textContent=item;ul.appendChild(li)});\n  document.getElementById('result').classList.add('show');\n}\n<\/script>\n<\/body>\n<\/html>\n<\/div><\/div><\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Specific Speed Calculator \u2014 Pump Type Recommender | BBP Specific Speed Calculator Enter your duty point and operating speed. Returns specific speed in both US (Ns) and metric (ns), recommends the pump type, and maps to a BBP product class. Based on ANSI\/HI 14.1 and ISO 9906:2012 definitions. Step 1 \u2014 Choose units US Units [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"parent":2755,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_gspb_post_css":"","footnotes":""},"class_list":["post-2956","page","type-page","status-publish","hentry"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/bbpmfg.com\/es\/wp-json\/wp\/v2\/pages\/2956","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bbpmfg.com\/es\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/bbpmfg.com\/es\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/bbpmfg.com\/es\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/bbpmfg.com\/es\/wp-json\/wp\/v2\/comments?post=2956"}],"version-history":[{"count":0,"href":"https:\/\/bbpmfg.com\/es\/wp-json\/wp\/v2\/pages\/2956\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/bbpmfg.com\/es\/wp-json\/wp\/v2\/pages\/2755"}],"wp:attachment":[{"href":"https:\/\/bbpmfg.com\/es\/wp-json\/wp\/v2\/media?parent=2956"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}