{"id":4654,"date":"2026-04-29T08:50:41","date_gmt":"2026-04-29T08:50:41","guid":{"rendered":"https:\/\/bbpmfg.com\/?page_id=4654"},"modified":"2026-04-29T09:09:45","modified_gmt":"2026-04-29T09:09:45","slug":"multistage-pump-stage-count-estimator","status":"publish","type":"page","link":"https:\/\/bbpmfg.com\/ar\/multistage-pumps\/multistage-pump-stage-count-estimator\/","title":{"rendered":"\u0645\u0642\u062f\u0631 \u0639\u062f\u062f \u0645\u0631\u0627\u062d\u0644 \u0627\u0644\u0645\u0636\u062e\u0629 \u0645\u062a\u0639\u062f\u062f\u0629 \u0627\u0644\u0645\u0631\u0627\u062d\u0644 | \u0628\u064a\u0628\u0627\u0646\u062c\u0628\u0648"},"content":{"rendered":"\n<div class=\"wp-block-stackable-columns alignfull stk-block-columns stk-block stk-ad17daf\" data-block-id=\"ad17daf\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-ad17daf-column alignfull\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-4dc7955\" data-v=\"4\" data-block-id=\"4dc7955\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-4dc7955-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-4dc7955-inner-blocks\"><\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-columns alignfull stk-block-columns stk-block stk-dc363d7\" data-block-id=\"dc363d7\"><style>.stk-dc363d7-column{--stk-columns-spacing:var(--stk--preset--spacing--40, 1rem) !important;}<\/style><div class=\"stk-row stk-inner-blocks has-text-align-center stk-block-content stk-content-align stk-dc363d7-column alignfull\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-b5173ed\" data-v=\"4\" data-block-id=\"b5173ed\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-b5173ed-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-b5173ed-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-ceda921\" data-block-id=\"ceda921\"><style>.stk-ceda921 {margin-bottom:0px !important;}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-ceda921-column alignfull\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-93e0b0d\" data-v=\"4\" data-block-id=\"93e0b0d\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-93e0b0d-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-93e0b0d-inner-blocks\">\n<section id=\"bbp-stage-estimator-module\">\n  <style>\n    \/* ==========================================================================\n       [\u6700\u9ad8\u9694\u79bb\u539f\u5219] \u9876\u7ea7 ID #bbp-stage-estimator-module \u5f3a\u9694\u79bb\n       [\u6392\u7248\u903b\u8f91] \u5de6\u53f3\u4e0d\u5bf9\u79f0\u7f51\u683c\uff0c\u5168\u57df\u6d45\u7070\u5e95\u76d8\u8d2f\u7a7f\uff0c\u6a21\u5757\u5316\u6d88\u9664\u7559\u767d\n       [\u4e3b\u9898\u7ee7\u627f] \u7edd\u5bf9\u4e0d\u4f7f\u7528 font-family\uff0c\u5b8c\u5168\u7ee7\u627f Blocksy \u5b57\u4f53\u4f53\u7cfb\n       ========================================================================== *\/\n\n    #bbp-stage-estimator-module {\n      position: relative !important;\n      width: 100% !important;\n      background-color: #f4f7fa !important; \/* \u7edf\u4e00\u7684\u6781\u6d45\u5de5\u7a0b\u7070\u5e95\u677f *\/\n      padding: 80px 0 !important;\n      overflow: hidden !important;\n      box-sizing: border-box !important;\n      z-index: 1 !important;\n    }\n\n    #bbp-stage-estimator-module * { box-sizing: border-box !important; }\n\n    \/* \u9ad8\u7ea7\u56fe\u5c42\uff1a\u7cbe\u5bc6\u84dd\u56fe\u7f51\u683c\u8d2f\u7a7f\u59cb\u7ec8 *\/\n    #bbp-stage-estimator-module::before {\n      content: '' !important;\n      position: absolute !important;\n      top: 0 !important; left: 0 !important; right: 0 !important; bottom: 0 !important;\n      background-image: \n        linear-gradient(rgba(24, 72, 192, 0.03) 1px, transparent 1px),\n        linear-gradient(90deg, rgba(24, 72, 192, 0.03) 1px, transparent 1px) !important;\n      background-size: 40px 40px !important;\n      z-index: -1 !important;\n      pointer-events: none !important;\n    }\n\n    \/* \u5bb9\u5668\u63a7\u5236 *\/\n    #bbp-stage-estimator-module .bbp-container {\n      max-width: 1600px !important;\n      margin: 0 auto !important;\n      padding: 0 40px !important;\n      position: relative !important;\n      z-index: 2 !important;\n      display: grid !important;\n      grid-template-columns: 1fr 1.6fr !important; \/* \u6838\u5fc3\uff1a\u5de6\u53f3\u5bf9\u5cd9\u5e03\u5c40 *\/\n      gap: 60px !important;\n      align-items: start !important;\n    }\n\n    \/* --- \u5de6\u4fa7\uff1a\u4fe1\u606f\u5bfc\u8bfb\u8231 --- *\/\n    #bbp-stage-estimator-module .bbp-info-col {\n      position: sticky !important;\n      top: 40px !important;\n      background: #1848C0 !important; \/* \u4e3b\u84dd\u57fa\u5ea7 *\/\n      color: #ffffff !important;\n      padding: 50px 40px !important;\n      box-shadow: 0 20px 40px rgba(24, 72, 192, 0.15) !important;\n      background-image: repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 2px, transparent 2px, transparent 10px) !important;\n    }\n\n    \/* \u5168\u6a21\u5757\u552f\u4e00 H2 *\/\n    #bbp-stage-estimator-module h2.bbp-m-title {\n      font-size: 32px !important;\n      color: #ffffff !important;\n      font-weight: 800 !important;\n      line-height: 1.25 !important;\n      margin: 0 0 20px 0 !important;\n      border-left: 6px solid #F0C018 !important; \/* \u5de5\u4e1a\u9ec4\u951a\u70b9 *\/\n      padding-left: 20px !important;\n    }\n\n    #bbp-stage-estimator-module p.bbp-m-lead {\n      font-size: 16px !important;\n      color: rgba(255, 255, 255, 0.9) !important;\n      line-height: 1.8 !important;\n      margin: 0 !important;\n      text-align: justify !important;\n    }\n\n\n    \/* --- \u53f3\u4fa7\uff1a\u53c2\u6570\u8ba1\u7b97\u53f0 (\u7eaf\u767d\u9762\u677f) --- *\/\n    #bbp-stage-estimator-module .bbp-calc-col {\n      background: #ffffff !important;\n      padding: 50px 60px !important;\n      border-top: 8px solid #F0C018 !important;\n      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.08) !important;\n      position: relative !important;\n    }\n\n    #bbp-stage-estimator-module .bbp-form-body { display: block !important; }\n\n    #bbp-stage-estimator-module .bbp-form-step {\n      margin-bottom: 30px !important;\n      padding-bottom: 30px !important;\n      border-bottom: 1px dashed #e2e8f0 !important;\n    }\n    #bbp-stage-estimator-module .bbp-form-step:last-of-type { border-bottom: none !important; padding-bottom: 20px !important; }\n\n    \/* H3 \u964d\u7ea7\u5904\u7406 *\/\n    #bbp-stage-estimator-module h3.bbp-step-title {\n      font-size: 16px !important;\n      color: #1848C0 !important;\n      font-weight: 800 !important;\n      text-transform: uppercase !important;\n      letter-spacing: 1px !important;\n      margin: 0 0 20px 0 !important;\n      display: flex !important;\n      align-items: center !important;\n    }\n\n    #bbp-stage-estimator-module h3.bbp-step-title::before {\n      content: '' !important;\n      display: inline-block !important;\n      width: 8px !important; height: 8px !important;\n      background: #F0C018 !important;\n      margin-right: 12px !important;\n    }\n\n    #bbp-stage-estimator-module .bbp-input-grid {\n      display: grid !important;\n      grid-template-columns: 1fr 1fr !important;\n      gap: 24px !important;\n    }\n\n    #bbp-stage-estimator-module label.bbp-label-group {\n      display: flex !important;\n      flex-direction: column !important;\n      margin: 0 !important;\n    }\n\n    #bbp-stage-estimator-module .bbp-label-text {\n      font-size: 14px !important;\n      font-weight: 700 !important;\n      color: #111827 !important;\n      margin-bottom: 10px !important;\n    }\n\n    \/* \u8f93\u5165\u6846\u5f3a\u5316 *\/\n    #bbp-stage-estimator-module input[type=number],\n    #bbp-stage-estimator-module select {\n      width: 100% !important;\n      padding: 14px 16px !important;\n      border: 1px solid #cbd5e1 !important;\n      background: #f8fafc !important;\n      font-size: 15px !important;\n      color: #0f172a !important;\n      border-radius: 0 !important;\n      transition: all 0.3s ease !important;\n      outline: none !important;\n      appearance: auto !important;\n    }\n\n    #bbp-stage-estimator-module input[type=number]:focus,\n    #bbp-stage-estimator-module select:focus {\n      border-color: #1848C0 !important;\n      background: #ffffff !important;\n      box-shadow: inset 4px 0 0 #F0C018 !important;\n    }\n\n    #bbp-stage-estimator-module .bbp-submit-btn {\n      display: block !important;\n      width: 100% !important;\n      padding: 20px !important;\n      background: #1848C0 !important;\n      color: #ffffff !important;\n      border: none !important;\n      font-size: 16px !important;\n      font-weight: 800 !important;\n      text-transform: uppercase !important;\n      letter-spacing: 1px !important;\n      cursor: pointer !important;\n      transition: all 0.3s ease !important;\n    }\n\n    #bbp-stage-estimator-module .bbp-submit-btn:hover {\n      background: #F0C018 !important;\n      color: #111111 !important;\n    }\n\n    \/* --- \u7ed3\u679c\u8f93\u51fa\u8231 (\u6df1\u7a7a\u9ed1\u6781\u5ba2\u9762\u677f) --- *\/\n    #bbp-stage-estimator-module .bbp-result-panel {\n      display: none !important;\n      margin-top: 40px !important;\n      background: #111827 !important;\n      padding: 40px !important;\n      border-left: 6px solid #F0C018 !important;\n      color: #f1f5f9 !important;\n      animation: bbpSlideDown 0.4s ease forwards !important;\n    }\n\n    #bbp-stage-estimator-module .bbp-result-panel.show { display: block !important; }\n\n    @keyframes bbpSlideDown {\n      from { opacity: 0; transform: translateY(-10px); }\n      to { opacity: 1; transform: translateY(0); }\n    }\n\n    #bbp-stage-estimator-module h3.bbp-res-h3 { color: #ffffff !important; font-size: 22px !important; font-weight: 800 !important; margin: 0 0 10px 0 !important; }\n    #bbp-stage-estimator-module p.bbp-res-subtitle { font-size: 14px !important; color: #94a3b8 !important; margin: 0 0 20px 0 !important; font-family: monospace !important; border-bottom: 1px solid rgba(255,255,255,0.1) !important; padding-bottom: 15px !important;}\n    \n    \/* \u6838\u5fc3\u53c2\u6570\u77e9\u9635 *\/\n    #bbp-stage-estimator-module .bbp-stage-display {\n      display: grid !important;\n      grid-template-columns: repeat(3, 1fr) !important;\n      gap: 15px !important;\n      margin: 25px 0 !important;\n      padding: 20px !important;\n      background: rgba(255,255,255,0.03) !important;\n      border: 1px solid rgba(255,255,255,0.05) !important;\n    }\n\n    #bbp-stage-estimator-module .bbp-stage-block { display: flex !important; flex-direction: column !important; align-items: center !important; text-align: center !important; border-right: 1px solid rgba(255,255,255,0.1) !important; }\n    #bbp-stage-estimator-module .bbp-stage-block:last-child { border-right: none !important; }\n    \n    #bbp-stage-estimator-module .bbp-stage-block .num { font-size: 38px !important; font-weight: 900 !important; color: #F0C018 !important; line-height: 1 !important; margin-bottom: 8px !important; font-family: monospace !important; }\n    #bbp-stage-estimator-module .bbp-stage-block .lbl { font-size: 12px !important; color: #cbd5e1 !important; text-transform: uppercase !important; letter-spacing: 1px !important; font-weight: 700 !important; }\n\n    \/* \u80fd\u6548\u67f1\u72b6\u56fe\u91cd\u6784 (\u5de5\u4e1a\u4eea\u8868\u76d8\u98ce\u683c) *\/\n    #bbp-stage-estimator-module h4.bbp-eff-title { font-size: 15px !important; color: #ffffff !important; font-weight: 700 !important; margin: 30px 0 15px 0 !important; }\n    #bbp-stage-estimator-module .bbp-eff-chart { margin-bottom: 30px !important; }\n    \n    #bbp-stage-estimator-module .bbp-eff-row { display: flex !important; align-items: center !important; gap: 15px !important; margin-bottom: 12px !important; }\n    #bbp-stage-estimator-module .bbp-stage-num { width: 70px !important; font-weight: 700 !important; font-size: 14px !important; color: #94a3b8 !important; }\n    \n    #bbp-stage-estimator-module .bbp-bar { flex: 1 !important; height: 16px !important; background: rgba(255,255,255,0.1) !important; overflow: hidden !important; }\n    #bbp-stage-estimator-module .bbp-bar div { height: 100% !important; background: linear-gradient(90deg, #10b981 0%, #1848C0 60%, #ef4444 100%) !important; transition: width 1s ease !important; }\n    \n    #bbp-stage-estimator-module .bbp-eff-row.recommended .bbp-stage-num { color: #10b981 !important; }\n    #bbp-stage-estimator-module .bbp-eff-row.recommended .bbp-bar div { background: #10b981 !important; }\n    \n    #bbp-stage-estimator-module .bbp-pct { width: 50px !important; text-align: right !important; font-weight: 800 !important; font-size: 14px !important; color: #ffffff !important; font-family: monospace !important; }\n\n    \/* \u8b66\u544a\u4e0e\u603b\u7ed3 *\/\n    #bbp-stage-estimator-module .bbp-warning { background: rgba(240, 192, 24, 0.1) !important; border-left: 3px solid #F0C018 !important; padding: 15px 20px !important; margin-bottom: 20px !important; font-size: 14px !important; color: #f1f5f9 !important; line-height: 1.6 !important; }\n    #bbp-stage-estimator-module .bbp-warning strong { color: #F0C018 !important; display: block !important; margin-bottom: 4px !important; }\n    \n    #bbp-stage-estimator-module p.bbp-res-desc { font-size: 14px !important; color: #cbd5e1 !important; line-height: 1.7 !important; margin-bottom: 30px !important; text-align: justify !important;}\n\n    \/* \u5e95\u90e8\u9759\u6001 CTA \u94fe\u63a5\u6837\u5f0f *\/\n    #bbp-stage-estimator-module a.bbp-cta-link {\n      display: block !important;\n      text-align: center !important;\n      background: #1848C0 !important;\n      color: #ffffff !important;\n      padding: 18px !important;\n      text-decoration: none !important;\n      font-weight: 800 !important;\n      font-size: 16px !important;\n      text-transform: uppercase !important;\n      letter-spacing: 0.5px !important;\n      transition: all 0.3s !important;\n    }\n    #bbp-stage-estimator-module a.bbp-cta-link:hover { background: #ffffff !important; color: #1848C0 !important; }\n\n\n    \/* --- \u79fb\u52a8\u7aef\u65ad\u70b9\u9002\u914d --- *\/\n    @media (max-width:1000px) {\n      #bbp-stage-estimator-module .bbp-container { grid-template-columns: 1fr !important; gap: 40px !important; }\n      #bbp-stage-estimator-module .bbp-info-col { position: relative !important; top: 0 !important; }\n    }\n\n    @media (max-width:690px) {\n      #bbp-stage-estimator-module { padding: 40px 0 !important; }\n      #bbp-stage-estimator-module .bbp-container { padding: 0 20px !important; }\n      #bbp-stage-estimator-module h2.bbp-m-title { font-size: 26px !important; }\n      #bbp-stage-estimator-module .bbp-calc-col { padding: 30px 20px !important; }\n      #bbp-stage-estimator-module .bbp-input-grid { grid-template-columns: 1fr !important; gap: 20px !important; }\n      #bbp-stage-estimator-module .bbp-result-panel { padding: 30px 20px !important; }\n      #bbp-stage-estimator-module .bbp-stage-display { grid-template-columns: 1fr !important; gap: 25px !important; }\n      #bbp-stage-estimator-module .bbp-stage-block { border-right: none !important; border-bottom: 1px solid rgba(255,255,255,0.1) !important; padding-bottom: 15px !important; }\n      #bbp-stage-estimator-module .bbp-stage-block:last-child { border-bottom: none !important; padding-bottom: 0 !important; }\n    }\n  <\/style>\n\n  <div class=\"bbp-container\">\n    \n    <div class=\"bbp-info-col\">\n      <h2 class=\"bbp-m-title\">Multistage Pump Stage Count Estimator<\/h2>\n      <p class=\"bbp-m-lead\">Stage count is the most expensive selection mistake in multistage pumps. Industry field notes report a 2\u20134% hydraulic efficiency loss per additional stage above the BEP-optimum number for a given duty. This tool returns the minimum stage count that lands your duty head, plus an efficiency-penalty visualization for the next 4 stage counts.<\/p>\n    <\/div>\n\n    <div class=\"bbp-calc-col\">\n      <div class=\"bbp-form-body\">\n        \n        <div class=\"bbp-form-step\">\n          <h3 class=\"bbp-step-title\">Duty Point Inputs<\/h3>\n          <div class=\"bbp-input-grid\">\n            <label class=\"bbp-label-group\">\n              <span class=\"bbp-label-text\">Required head H (m)<\/span>\n              <input type=\"number\" id=\"bbp-est-head\" min=\"10\" max=\"500\" step=\"1\" value=\"120\">\n            <\/label>\n            <label class=\"bbp-label-group\">\n              <span class=\"bbp-label-text\">Required flow Q (m\u00b3\/h)<\/span>\n              <input type=\"number\" id=\"bbp-est-flow\" min=\"0.5\" max=\"500\" step=\"0.5\" value=\"20\">\n            <\/label>\n            <label class=\"bbp-label-group\">\n              <span class=\"bbp-label-text\">Architecture \/ Size class<\/span>\n              <select id=\"bbp-est-arch\">\n                <option value=\"qdls25\" data-stage=\"7\">25QDLS \u2014 1.5\u20133 m\u00b3\/h, 7 m\/stage<\/option>\n                <option value=\"qdls32\" data-stage=\"9\">32QDLS \u2014 3\u20136 m\u00b3\/h, 9 m\/stage<\/option>\n                <option value=\"qdls40\" data-stage=\"10\">40QDLS \u2014 6\u201312 m\u00b3\/h, 10 m\/stage<\/option>\n                <option value=\"qdls50\" data-stage=\"11\" selected>50QDLS \u2014 12\u201316 m\u00b3\/h, 11 m\/stage<\/option>\n                <option value=\"qdls65\" data-stage=\"12\">65QDLS \u2014 16\u201332 m\u00b3\/h, 12 m\/stage<\/option>\n                <option value=\"qdls80\" data-stage=\"13\">80QDLS \u2014 32\u201355 m\u00b3\/h, 13 m\/stage<\/option>\n                <option value=\"qdls100\" data-stage=\"14\">100QDLS \u2014 55\u201385 m\u00b3\/h, 14 m\/stage<\/option>\n                <option value=\"qdls125\" data-stage=\"15\">125QDLS \u2014 85\u2013150 m\u00b3\/h, 15 m\/stage<\/option>\n                <option value=\"qdls150\" data-stage=\"16\">150QDLS \u2014 150\u2013200 m\u00b3\/h, 16 m\/stage<\/option>\n              <\/select>\n            <\/label>\n            <label class=\"bbp-label-group\">\n              <span class=\"bbp-label-text\">Operating speed<\/span>\n              <select id=\"bbp-est-rpm\">\n                <option value=\"2900\">2,900 rpm (50 Hz, 2-pole)<\/option>\n                <option value=\"3500\">3,500 rpm (60 Hz, 2-pole)<\/option>\n                <option value=\"1450\">1,450 rpm (50 Hz, 4-pole)<\/option>\n              <\/select>\n            <\/label>\n          <\/div>\n        <\/div>\n\n        <button type=\"button\" class=\"bbp-submit-btn\" onclick=\"bbp_estimate_stage_count()\">Estimate Stage Count<\/button>\n      <\/div>\n\n      <div id=\"bbp-est-result-box\" class=\"bbp-result-panel\">\n        \n        <div id=\"bbp-est-result-dynamic\"><\/div>\n        \n        <p class=\"bbp-res-desc\"><strong>Why this matters.<\/strong> Each additional stage above the optimum count adds ~2\u20134% hydraulic efficiency loss, increases axial thrust on the bearing, and raises cavitation risk on warm water. Over a 15\u201320 year service life, two extra stages translate to five-figure energy waste on a mid-size pump.<\/p>\n        \n        <a class=\"bbp-cta-link\" href=\"#ct-popup-820\">Submit duty point for free curve overlay \u2192<\/a>\n      \n      <\/div>\n\n    <\/div>\n  <\/div>\n\n  <script>\n    \/* ==========================================================================\n       [\u5b89\u5168 JS \u6838\u5fc3] \u5f03\u7528\u8868\u5355\uff0c\u7981\u6b62 IIFE\/\u95ed\u5305\uff0c\u6d88\u706d && \u903b\u8f91\uff0c\u91c7\u7528\u5185\u8054 onclick \u89e6\u53d1\n       ========================================================================== *\/\n    function bbp_estimate_stage_count() {\n      var headInput = document.getElementById('bbp-est-head').value;\n      var flowInput = document.getElementById('bbp-est-flow').value;\n\n      if (!headInput) { alert('Please enter required head.'); return; }\n      if (!flowInput) { alert('Please enter required flow.'); return; }\n\n      var H = parseFloat(headInput);\n      var Q = parseFloat(flowInput);\n      var archSel = document.getElementById('bbp-est-arch');\n      var option = archSel.options[archSel.selectedIndex];\n      var perStage = parseFloat(option.getAttribute('data-stage'));\n      \n      var rawArchText = option.text;\n      var archNameParts = rawArchText.split(' \u2014 ');\n      var archName = archNameParts[0];\n      \n      var rpm = document.getElementById('bbp-est-rpm').value;\n\n      var stages = Math.ceil(H \/ perStage);\n      if (stages < 2) { stages = 2; }\n      if (stages > 28) { stages = 28; }\n      \n      var actualHead = stages * perStage;\n      var baseEff = 72; \/\/ % at BEP-optimum\n\n      \/\/ \u6784\u5efa HTML\n      var dynamicHtml = \n        '<h3 class=\"bbp-res-h3\">Recommended Stage Count<\/h3>' +\n        '<p class=\"bbp-res-subtitle\">Architecture: ' + archName + ' at ' + rpm + ' rpm \u00b7 Per-stage head &approx; ' + perStage + ' m<\/p>' +\n        '<div class=\"bbp-stage-display\">' +\n          '<div class=\"bbp-stage-block\"><div class=\"num\">' + stages + '<\/div><div class=\"lbl\">Stages<\/div><\/div>' +\n          '<div class=\"bbp-stage-block\"><div class=\"num\">' + actualHead + ' m<\/div><div class=\"lbl\">Actual head<\/div><\/div>' +\n          '<div class=\"bbp-stage-block\"><div class=\"num\">~' + baseEff + '%<\/div><div class=\"lbl\">Efficiency at BEP<\/div><\/div>' +\n        '<\/div>' +\n        '<h4 class=\"bbp-eff-title\">Efficiency penalty for over-staging<\/h4>' +\n        '<div class=\"bbp-eff-chart\">';\n\n      \/\/ \u5faa\u73af\u6784\u5efa\u80fd\u6548\u8870\u51cf\u56fe\u8868\n      var maxLoops = stages + 4;\n      if (maxLoops > 28) { maxLoops = 28; }\n      var i = stages;\n\n      while (i <= maxLoops) {\n        var penalty = (i - stages) * 3;\n        var eff = baseEff - penalty;\n        var isRecommended = false;\n        if (i === stages) { isRecommended = true; }\n\n        var rowClass = 'bbp-eff-row';\n        var recStar = '';\n        if (isRecommended) { \n          rowClass = rowClass + ' recommended'; \n          recStar = ' &starf;';\n        }\n\n        var barWidth = (eff \/ baseEff) * 100;\n\n        dynamicHtml = dynamicHtml + \n          '<div class=\"' + rowClass + '\">' +\n            '<div class=\"bbp-stage-num\">' + i + ' stg' + recStar + '<\/div>' +\n            '<div class=\"bbp-bar\"><div style=\"width:' + barWidth + '%\"><\/div><\/div>' +\n            '<div class=\"bbp-pct\">' + eff.toFixed(0) + '%<\/div>' +\n          '<\/div>';\n        \n        i++;\n      }\n\n      dynamicHtml = dynamicHtml + '<\/div>';\n\n      \/\/ \u8b66\u544a\u63d0\u793a\u6761\u4ef6\u5224\u65ad (\u6452\u5f03 &&)\n      var headThreshold = actualHead - (perStage * 0.5);\n      if (H < headThreshold) {\n        dynamicHtml = dynamicHtml + '<div class=\"bbp-warning\"><strong>Note.<\/strong> Actual head ' + actualHead + ' m exceeds your target ' + H + ' m. The curve will sit above the duty point \u2014 verify VFD trim or impeller trim with our application team.<\/div>';\n      }\n\n      if (stages > 20) {\n        dynamicHtml = dynamicHtml + '<div class=\"bbp-warning\"><strong>Stage count >20.<\/strong> Beyond 20 stages, axial thrust and rotor sensitivity to NPSH-available become design constraints. Consider a higher per-stage frame (move up one size class) or 2-pump series configuration.<\/div>';\n      }\n\n      \/\/ \u6ce8\u5165 DOM\n      document.getElementById('bbp-est-result-dynamic').innerHTML = dynamicHtml;\n      \n      var resBox = document.getElementById('bbp-est-result-box');\n      resBox.style.display = 'block';\n      resBox.classList.add('show');\n      resBox.scrollIntoView({ behavior: 'smooth', block: 'nearest' });\n    }\n  <\/script>\n<\/section>\n<\/div><\/div><\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Multistage Pump Stage Count Estimator Stage count is the most expensive selection mistake in multistage pumps. Industry field notes report a 2\u20134% hydraulic efficiency loss per additional stage above the BEP-optimum number for a given duty. This tool returns the minimum stage count that lands your duty head, plus an efficiency-penalty visualization for the next [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":1726,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_gspb_post_css":"","footnotes":""},"class_list":["post-4654","page","type-page","status-publish","hentry"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/bbpmfg.com\/ar\/wp-json\/wp\/v2\/pages\/4654","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bbpmfg.com\/ar\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/bbpmfg.com\/ar\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/bbpmfg.com\/ar\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/bbpmfg.com\/ar\/wp-json\/wp\/v2\/comments?post=4654"}],"version-history":[{"count":0,"href":"https:\/\/bbpmfg.com\/ar\/wp-json\/wp\/v2\/pages\/4654\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/bbpmfg.com\/ar\/wp-json\/wp\/v2\/pages\/1726"}],"wp:attachment":[{"href":"https:\/\/bbpmfg.com\/ar\/wp-json\/wp\/v2\/media?parent=4654"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}