{"id":1525,"date":"2025-08-27T14:47:33","date_gmt":"2025-08-27T06:47:33","guid":{"rendered":"https:\/\/www.tflequip.com\/?p=1525"},"modified":"2025-08-27T15:04:24","modified_gmt":"2025-08-27T07:04:24","slug":"internal-assembly-procedures-and-requirements-for-chemical-centrifugal-pumps","status":"publish","type":"post","link":"https:\/\/www.tflequip.com\/es\/internal-assembly-procedures-and-requirements-for-chemical-centrifugal-pumps\/","title":{"rendered":"Procedimientos y requisitos de montaje interno para bombas centr\u00edfugas qu\u00edmicas"},"content":{"rendered":"<div class=\"auto-hide-last-sibling-br paragraph-JOTKXA paragraph-element br-paragraph-space\">Chemical centrifugal pumps are commonly used chemical water pumps in industrial production. A typical chemical centrifugal pump consists of main components such as a pump casing, impeller, mechanical seal, bearing, and coupling. Additionally, components like sealing rings and wear rings should not be overlooked. Below is a detailed overview of the assembly requirements for each component of a chemical centrifugal pump and the specific assembly procedures.<\/div>\n<h2 class=\"header-vfC6AV auto-hide-last-sibling-br\">Assembly Requirements<\/h2>\n<h3 class=\"header-vfC6AV auto-hide-last-sibling-br\">1. Cleaning<\/h3>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>All parts must pass inspection, with material codes complying with drawing requirements. Their surfaces should be thoroughly cleaned, and mating surfaces should be coated with machine oil.<\/li>\n<li>The interior of the bearing housing must be cleaned and painted with oil-resistant enamel. Allow it to dry naturally for 24 hours, and only proceed with assembly after passing inspection.<\/li>\n<\/ul>\n<h3 class=\"header-vfC6AV auto-hide-last-sibling-br\">2. Requirements for Sub-assembly and Final Assembly<\/h3>\n<ol class=\"auto-hide-last-sibling-br\">\n<li>When assembling flat keys and bearings, do not strike them directly with a hammer. Instead, use a wooden hammer, copper rod, or specialized assembly tools.<\/li>\n<li>For interference fits (e.g., bearing inner rings with tolerances r6 or s6), heat the bearing to 80-120\u00b0C for hot assembly.<\/li>\n<li>Apply dry oil to the end of the stud bolt that connects to the base. Ensure all stud bolts have the same length and are tightened evenly.<\/li>\n<li>During assembly, avoid scratching the surfaces of parts\u2014especially mating and sealing surfaces\u2014as this may affect assembly quality.<\/li>\n<\/ol>\n<h3 class=\"header-vfC6AV auto-hide-last-sibling-br\">3. Assembly of Bearings and Shaft<\/h3>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>Heat the bearing to 90\u00b0C-110\u00b0C in a heating furnace, then mount it on the shaft and allow it to cool.<\/li>\n<li>First, install the left bearing cover of the bearing housing. Then, insert the assembly of the bearing and shaft into the bearing housing, positioning it against the left bearing cover.<\/li>\n<li>Measure the gap between the drive-end bearing cover and the end face of the bearing outer ring:\n<ul class=\"auto-hide-last-sibling-br\">\n<li>For CZ pumps: 0.30-0.70 mm<\/li>\n<li>For ZA pumps: 0-0.42 mm<\/li>\n<\/ul>\n<\/li>\n<li>If paired bearings are used for ZA pumps, use a lock nut to secure the bearings until the outer rings of the two bearings can rotate slightly relative to each other\u2014this ensures optimal internal clearance.<\/li>\n<\/ul>\n<h3 class=\"header-vfC6AV auto-hide-last-sibling-br\">4. Assembly of Wear Rings with Impellers and Pump Bodies<\/h3>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>When assembling wear rings with impellers and pump bodies, ensure the wear ring is evenly installed into the impeller or pump body around its circumference to minimize geometric deviations of the wear ring.<\/li>\n<li>After installing set screws or completing welding, measure the radial runout of the impeller and wear ring, as well as the gap between them. The measured values must comply with the general technical specifications for pump assembly. Refurbish any parts that exceed the tolerance range.<\/li>\n<\/ul>\n<h3 class=\"header-vfC6AV auto-hide-last-sibling-br\">5. Impeller Installation<\/h3>\n<h4 class=\"header-vfC6AV auto-hide-last-sibling-br\">For Single-stage Pumps<\/h4>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>Conduct a static balance test on the impeller to meet technical requirements.<\/li>\n<li>Mount the impeller on the shaft, secure it with a nut, then insert the entire rotor into the pump body and tighten with a nut.<\/li>\n<\/ul>\n<h4 class=\"header-vfC6AV auto-hide-last-sibling-br\">For Multi-stage Pumps<\/h4>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>In addition to a static balance test for each impeller, perform a trial assembly of rotor components: assemble all impellers with the shaft, mark their positions, and conduct a dynamic balance test (results must meet technical requirements).<\/li>\n<li>During installation:\n<ol class=\"auto-hide-last-sibling-br\">\n<li>Push the balance drum, shaft sleeve, and all impellers to the right until the first-stage impeller and shaft sleeve rest against the shaft shoulders respectively.<\/li>\n<li>Measure the gap between the shaft sleeve and the balance drum\u2014ensure it is \u2265 0.5 mm. If the gap is too small, refurbish the balance drum to meet the requirement.<\/li>\n<li>Insert the shaft with the first-stage impeller into the suction casing, then install impellers and middle casings with guide vanes onto the shaft step-by-step until reaching the discharge casing.<\/li>\n<li>Secure the pump components with bolts, then install the balance device, seals, and bearing components.<\/li>\n<li>Confirm the correct mid-position of the rotor and adjust the axial clearance of the tapered bearings to 0.04-0.06 mm.<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<h3 class=\"header-vfC6AV auto-hide-last-sibling-br\">6. Mechanical Seal Assembly<\/h3>\n<ol class=\"auto-hide-last-sibling-br\">\n<li>\n<div class=\"auto-hide-last-sibling-br paragraph-JOTKXA paragraph-element br-paragraph-space\">Ensure all mating surfaces fit tightly during assembly, and apply industrial petroleum jelly lubricant to the friction surfaces.<\/div>\n<\/li>\n<li>\n<div class=\"auto-hide-last-sibling-br paragraph-JOTKXA paragraph-element br-paragraph-space\">Installation of Cartridge Mechanical Seals<\/div>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>First, use stud bolts and nuts to mount the seal onto the pump cover.<\/li>\n<li>After inserting the pump shaft into the seal sleeve and connecting the bearing housing to the pump body, remove the stop washer of the seal from the shaft sleeve.<\/li>\n<li>To reduce wear on O-rings, apply lubricant to the areas where O-rings pass. For EPDM (ethylene-propylene-diene monomer) O-rings, use soapy water or water as lubricant.<\/li>\n<\/ul>\n<\/li>\n<li>\n<div class=\"auto-hide-last-sibling-br paragraph-JOTKXA paragraph-element br-paragraph-space\">Installation of Packing Seals<\/div>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>Before installation, determine the length of each packing ring based on the outer diameter of the shaft sleeve. Slightly flatten the ring, wrap it around the shaft sleeve, and push it into the stuffing box. If a water seal ring is used, install it as required.<\/li>\n<li>After installing all packing, evenly tighten the packing gland.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3 class=\"header-vfC6AV auto-hide-last-sibling-br\">7. Adjustment of Bearing Housing for Horizontal Multi-stage Pumps<\/h3>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>For bearing housings of multi-stage pumps that are not positioned via spigots, perform alignment adjustment during installation:\n<ol class=\"auto-hide-last-sibling-br\">\n<li>Rotate the adjustment bolts to move the bearing housing vertically and horizontally.<\/li>\n<li>Measure the extreme positions of the bearing housing in both directions and take the average value.<\/li>\n<li>Lock the adjustment bolts with lock nuts, install locating pins, then assemble the seal and bearings. Finally, adjust the axial alignment of the rotor.<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<h3 class=\"header-vfC6AV auto-hide-last-sibling-br\">8. Coupling Installation (Pump Head Fixed)<\/h3>\n<ol class=\"auto-hide-last-sibling-br\">\n<li>\n<div class=\"auto-hide-last-sibling-br paragraph-JOTKXA paragraph-element br-paragraph-space\">Apply lubricant to the inner hole, shaft journal, and key of the coupling during assembly. Apply force evenly to avoid impact damage to parts.<\/div>\n<\/li>\n<li>\n<div class=\"auto-hide-last-sibling-br paragraph-JOTKXA paragraph-element br-paragraph-space\">Installation of Jaw Couplings<\/div>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>Similar to diaphragm couplings: mount the two flanges of the jaw coupling onto the corresponding shafts respectively, and adjust their relative positions using a straightedge.<\/li>\n<li>Si la velocidad de giro es \u2265 3600 rpm, utilice el m\u00e9todo de alineaci\u00f3n para acoplamientos de diafragma.<\/li>\n<\/ul>\n<\/li>\n<li>\n<div class=\"auto-hide-last-sibling-br paragraph-JOTKXA paragraph-element br-paragraph-space\">Instalaci\u00f3n de acoplamientos de diafragma<\/div>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>Monte los acoplamientos del extremo de la bomba y del extremo del motor en sus respectivos ejes.<\/li>\n<li>Utilice un reloj comparador para alinear la coaxialidad de los dos ejes (ajuste la posici\u00f3n del motor con calzos en sentido vertical):\n<ul class=\"auto-hide-last-sibling-br\">\n<li>Excentricidad radial \u2264 0,1 mm, excentricidad axial \u2264 0,05 mm (para condiciones generales).<\/li>\n<li>Si velocidad de rotaci\u00f3n &gt; 3600 rpm: excentricidad radial \u2264 0,05 mm, excentricidad axial \u2264 0,03 mm.<\/li>\n<\/ul>\n<\/li>\n<li>Una vez cumplidos los requisitos, instale la secci\u00f3n de acoplamiento intermedio.<\/li>\n<li>Si la temperatura de funcionamiento es relativamente alta (aproximadamente &gt; 130\u00b0C), realice la correcci\u00f3n de la alineaci\u00f3n en condiciones de alta temperatura cuando la bomba est\u00e9 en funcionamiento.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3 class=\"header-vfC6AV auto-hide-last-sibling-br\">9. Pintura<\/h3>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>La pintura debe realizarse en un lugar limpio y seco, con una temperatura ambiente no inferior a 5\u00b0C y una humedad relativa no superior a 70%. Si la humedad relativa supera los 70%, a\u00f1ada una cantidad adecuada de agente antihumedad a la pintura para evitar que el revestimiento se vuelva blanco.<\/li>\n<li>No pinte las siguientes zonas:\n<ul class=\"auto-hide-last-sibling-br\">\n<li>Piezas de metales no f\u00e9rreos, piezas de acero inoxidable y piezas chapadas con cromo, n\u00edquel, cadmio, plata, esta\u00f1o, etc.<\/li>\n<li>Piezas deslizantes, piezas de acoplamiento, superficies de sellado, superficies roscadas.<\/li>\n<li>Placas de caracter\u00edsticas y de direcci\u00f3n.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"size-medium wp-image-1433\" title=\".jpg\" src=\"https:\/\/www.tflequip.com\/wp-content\/uploads\/2025\/02\/-e1740729507350-300x291.jpg\" alt=\".jpg\" width=\"300\" height=\"291\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>Chemical centrifugal pumps are commonly used chemical water pumps in industrial production. A typical chemical centrifugal pump consists of main components such as a pump casing, impeller, mechanical seal, bearing, and coupling. Additionally, components like sealing rings and wear rings should not be overlooked. Below is a detailed overview of the assembly requirements for each [&hellip;]<\/p>","protected":false},"author":4,"featured_media":1433,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[36],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/www.tflequip.com\/es\/wp-json\/wp\/v2\/posts\/1525"}],"collection":[{"href":"https:\/\/www.tflequip.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tflequip.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tflequip.com\/es\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tflequip.com\/es\/wp-json\/wp\/v2\/comments?post=1525"}],"version-history":[{"count":0,"href":"https:\/\/www.tflequip.com\/es\/wp-json\/wp\/v2\/posts\/1525\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.tflequip.com\/es\/wp-json\/wp\/v2\/media\/1433"}],"wp:attachment":[{"href":"https:\/\/www.tflequip.com\/es\/wp-json\/wp\/v2\/media?parent=1525"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tflequip.com\/es\/wp-json\/wp\/v2\/categories?post=1525"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tflequip.com\/es\/wp-json\/wp\/v2\/tags?post=1525"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}