{"id":6186,"date":"2026-07-06T02:30:00","date_gmt":"2026-07-06T10:30:00","guid":{"rendered":"https:\/\/changyupump.com\/?p=6186"},"modified":"2026-07-05T02:35:03","modified_gmt":"2026-07-05T10:35:03","slug":"fgd-slurry-pump","status":"publish","type":"post","link":"https:\/\/changyupump.com\/ar\/blog\/fgd-slurry-pump\/","title":{"rendered":"\u0645\u0636\u062e\u0629 \u0627\u0644\u0645\u0644\u0627\u0637 FGD: \u062f\u0644\u064a\u0644 \u0646\u0642\u0644 \u0627\u0644\u062d\u062c\u0631 \u0627\u0644\u062c\u064a\u0631\u064a \u0648\u0627\u0644\u062c\u0628\u0633"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Quick Answer<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An&nbsp;<strong>FGD slurry pump<\/strong>&nbsp;is a heavy-duty pump engineered to handle the abrasive limestone slurry and scaling-prone gypsum slurry in wet flue gas desulfurization systems. These pumps face a unique combination of challenges: the limestone slurry is highly abrasive with up to 30% solid content, while the gypsum slurry tends to crystallize and form hard scale on pump internals during idle periods. Key selection factors:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Material determines wear life<\/strong>: The abrasive limestone slurry rapidly erodes standard metal pumps. UHMW-PE (ultra-high molecular weight polyethylene) lined pumps deliver superior combined resistance to both abrasive wear from limestone particles and chemical corrosion from the slurry environment, typically outlasting high-chrome alloy pumps by two to four times in FGD slurry service.<\/li>\n\n\n\n<li><strong>Impeller design prevents clogging<\/strong>: Gypsum scale and slurry solids can block narrow impeller passages. Semi-open impellers \u2014 which have no front shroud, leaving the vanes exposed on the suction side \u2014 eliminate the confined spaces between shrouds where solids accumulate. Combined with wide flow paths, this design resists clogging and maintains efficiency as wear occurs.<\/li>\n\n\n\n<li><strong>Seal selection prevents leakage<\/strong>: FGD slurry contains fine particles that penetrate standard mechanical seal faces, causing premature failure. External seal flush systems and double mechanical seals protect against slurry ingress and extend seal life.<\/li>\n\n\n\n<li><strong>Speed affects everything<\/strong>: Lower operating speeds reduce wear rate, extend component life, and improve long-term reliability. A pump operating at 1,450 rpm will outlast the same pump at 2,900 rpm by a factor of three to four in abrasive FGD service.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">In a coal-fired power plant, an FGD slurry pump failure does not just stop one pump \u2014 it can shut down the entire desulfurization system, forcing the plant to reduce load or face emissions compliance penalties. The abrasive limestone slurry wears through standard pump materials within months. The gypsum slurry crystallizes during any unplanned shutdown, seizing impellers and blocking discharge pipes.<\/p>\n\n\n<style>.kb-image6186_d486bc-f7 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<figure class=\"wp-block-kadence-image kb-image6186_d486bc-f7 size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"750\" src=\"https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/FGD-Slurry-Pump-Limestone-Gypsum-Transfer-Guide.webp\" alt=\"FGD-Slurry-Pump-Limestone-&amp;-Gypsum-Transfer-Guide\" class=\"kb-img wp-image-6337\" srcset=\"https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/FGD-Slurry-Pump-Limestone-Gypsum-Transfer-Guide.webp 1000w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/FGD-Slurry-Pump-Limestone-Gypsum-Transfer-Guide-300x225.webp 300w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/FGD-Slurry-Pump-Limestone-Gypsum-Transfer-Guide-150x113.webp 150w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/FGD-Slurry-Pump-Limestone-Gypsum-Transfer-Guide-768x576.webp 768w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/FGD-Slurry-Pump-Limestone-Gypsum-Transfer-Guide-16x12.webp 16w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">After reading this guide, you will understand the specific slurry challenges in FGD systems, which pump materials provide the longest service life, how to prevent gypsum scale from clogging your pumps, and how to select the right pump for each stage of the FGD process. With over 20 years of pump manufacturing experience, Changyu Pump presents this structured selection guide for FGD slurry pump applications.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. What Are the Key Slurry Challenges in FGD Systems?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Wet&nbsp;<a href=\"https:\/\/en.wikipedia.org\/wiki\/Flue-gas_desulfurization\" target=\"_blank\" rel=\"noreferrer noopener\">flue-gas desulfurization<\/a>&nbsp;(FGD) removes sulfur dioxide from power plant exhaust by scrubbing the flue gas with a limestone slurry. This process generates two distinct slurry streams, each presenting different pump challenges.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Two FGD Slurry Streams<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Limestone slurry:<\/strong>&nbsp;Crushed limestone is mixed with water to form a slurry containing 25\u201330% solid particles by weight. This slurry is pumped from the limestone preparation system to the absorber tower. The limestone particles are angular and hard, creating highly abrasive conditions that erode pump casings, impellers, and seals. The slurry is alkaline (pH 8\u201310), which limits the choice of materials \u2014 some metals that resist abrasion may corrode in the alkaline environment, and vice versa.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Gypsum slurry:<\/strong>&nbsp;Inside the absorber tower, the limestone reacts with sulfur dioxide to form calcium sulfite, which is oxidized to calcium sulfate dihydrate \u2014&nbsp;<a href=\"https:\/\/en.wikipedia.org\/wiki\/Gypsum\" target=\"_blank\" rel=\"noreferrer noopener\">gypsum<\/a>. The gypsum slurry, containing 15\u201325% solids, is pumped from the absorber to the dewatering system. Gypsum presents a different challenge than limestone: it tends to crystallize and form hard scale on pump internals, particularly during idle periods when the slurry cools and water evaporates. Gypsum scale accumulates on impeller surfaces, in seal chambers, and around discharge valves, progressively reducing flow and eventually seizing the pump.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Where FGD Pumps Are Located<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">FGD Stage<\/th><th class=\"has-text-align-left\" data-align=\"left\">Fluid<\/th><th class=\"has-text-align-left\" data-align=\"left\">Solids Content<\/th><th class=\"has-text-align-left\" data-align=\"left\">Primary Challenge<\/th><th class=\"has-text-align-left\" data-align=\"left\">Pump Type<\/th><\/tr><\/thead><tbody><tr><td>Limestone preparation<\/td><td>Limestone slurry<\/td><td>25\u201330%<\/td><td>Severe abrasion<\/td><td>Slurry pump with wear-resistant lining<\/td><\/tr><tr><td>Absorber circulation<\/td><td>Limestone\/gypsum mixed slurry<\/td><td>15\u201325%<\/td><td>Abrasion + scaling<\/td><td>Slurry pump with anti-scaling design<\/td><\/tr><tr><td>Gypsum bleed \/ transfer<\/td><td>Gypsum slurry<\/td><td>15\u201325%<\/td><td>Scaling + moderate abrasion<\/td><td>Slurry pump with wide flow passages<\/td><\/tr><tr><td>Filtrate \/ wastewater<\/td><td>Acidic chloride solution<\/td><td>&lt; 1%<\/td><td>Corrosion<\/td><td>Corrosion-resistant pump<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">2. What Are the Best Materials for FGD Slurry Pumps?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Material selection is the single most important factor determining FGD slurry pump service life. The material must resist both the mechanical wear from solid particles and the chemical corrosion from the slurry environment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">FGD Slurry Pump Material Comparison<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Material<\/th><th class=\"has-text-align-left\" data-align=\"left\">Abrasion Resistance<\/th><th class=\"has-text-align-left\" data-align=\"left\">Corrosion Resistance<\/th><th class=\"has-text-align-left\" data-align=\"left\">Anti-Scaling<\/th><th class=\"has-text-align-left\" data-align=\"left\">Temperature Limit<\/th><th class=\"has-text-align-left\" data-align=\"left\">Typical Service Life in FGD<\/th><\/tr><\/thead><tbody><tr><td>High-Chrome Alloy (Cr27-Cr33)<\/td><td>Good \u2014 resists cutting wear; matrix erosion in fine-particle slurries<\/td><td>Moderate \u2014 corrodes in acidic conditions<\/td><td>Poor \u2014 scale adheres to metal<\/td><td>150\u00b0C+<\/td><td>6\u201312 months<\/td><\/tr><tr><td>Natural Rubber<\/td><td>Good \u2014 resilience absorbs particle impact<\/td><td>Good \u2014 resistant to FGD pH range; limited by temperature (&lt; 70\u00b0C) and oxidizing environments<\/td><td>Good \u2014 non-stick surface<\/td><td>70\u00b0C<\/td><td>8\u201314 months<\/td><\/tr><tr><td>Duplex Stainless Steel (2205\/2507)<\/td><td>Moderate \u2014 softer than high-chrome<\/td><td>Excellent \u2014 PREN 33\u201344<\/td><td>Poor \u2014 scale adheres to metal surfaces; polished surfaces (Ra \u2264 0.4 \u03bcm) reduce adhesion compared to rough cast surfaces<\/td><td>120\u00b0C<\/td><td>8\u201316 months<\/td><\/tr><tr><td><a href=\"https:\/\/en.wikipedia.org\/wiki\/Ultra-high-molecular-weight_polyethylene\" target=\"_blank\" rel=\"noreferrer noopener\">UHMW-PE<\/a>&nbsp;Lined<\/td><td>Excellent \u2014 absorbs particle impact energy; particularly effective in wet, fine-particle slurries<\/td><td>Excellent \u2014 inert to acids and alkalis<\/td><td>Excellent \u2014 non-stick, scale-releasing surface<\/td><td>90\u00b0C<\/td><td>18\u201336 months<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Why UHMW-PE Lined Pumps Excel in FGD<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">UHMW-PE (ultra-high molecular weight polyethylene) is a high-performance engineering polymer with a molecular weight typically exceeding 3 million g\/mol. This structure gives it unique properties that directly address FGD slurry challenges:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Abrasion resistance:<\/strong>&nbsp;UHMW-PE has an abrasion resistance index several times higher than carbon steel. In limestone slurry service, UHMW-PE lined pumps consistently outlast high-chrome alloy pumps by a factor of two to three. Unlike metal pumps, which are progressively cut as sharp particles erode the softer matrix surrounding the hard carbides, UHMW-PE absorbs particle impact energy through molecular chain deformation \u2014 the material deforms elastically and recovers rather than being cut.<\/li>\n\n\n\n<li><strong>Chemical inertness:<\/strong>&nbsp;UHMW-PE is resistant to the full pH range encountered in FGD systems \u2014 from alkaline limestone slurry (pH 8\u201310) to acidic gypsum slurry and chloride-containing wastewater (pH 3\u20136). Unlike metals, it does not corrode in either environment.<\/li>\n\n\n\n<li><strong>Non-stick surface:<\/strong>&nbsp;Gypsum scale struggles to adhere to UHMW-PE&#8217;s low-friction, hydrophobic surface. Scale that does form releases easily during normal operation or light mechanical cleaning. This anti-scaling property is a significant operational advantage over metal pumps, which require regular acid cleaning or mechanical descaling.<\/li>\n\n\n\n<li><strong>Lower weight:<\/strong>&nbsp;UHMW-PE lined pumps are lighter than all-metal pumps of equivalent capacity, simplifying installation and maintenance handling.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Engineers at Changyu Pump recommend:<\/strong>&nbsp;For limestone slurry and gypsum slurry service, UHMW-PE lined pumps provide the optimal balance of abrasion resistance, corrosion resistance, and anti-scaling properties. The material cost premium over high-chrome alloy is recovered within the first year of operation through extended service life and reduced maintenance. For clean FGD filtrate and wastewater \u2014 where solids are absent but corrosion remains a concern \u2014 stainless steel pumps provide a cost-effective alternative. Specify duplex 2205 or 2507 for high-chloride FGD wastewater; 316L is only suitable for low-chloride applications (&lt; 500 mg\/L).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. How to Prevent Clogging in FGD Gypsum Pumps?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Gypsum scale and slurry solids can block pump passages during operation and seize the pump during shutdown. Preventing these failures requires attention to both pump design and operating procedures.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pump Design Features That Resist Clogging<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Semi-open impeller:<\/strong>&nbsp;A semi-open impeller has no front shroud \u2014 the impeller vanes are exposed on the suction side, eliminating the confined space between shrouds where solids accumulate in closed impeller designs. Solids that enter the impeller are thrown outward by centrifugal force without accumulating in confined spaces. The clearance between the impeller vanes and the casing is adjustable \u2014 as wear occurs, the clearance can be reset to maintain efficiency. For FGD slurry service, semi-open impellers provide the best balance of clog resistance, efficiency, and wear tolerance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Wide flow passages:<\/strong>&nbsp;The impeller and volute passages must be sized to pass the largest expected solid particles plus a safety margin. For limestone slurry, passages should accommodate particles up to 10\u201315 mm. For gypsum slurry, which contains softer but more adhesive solids, wider passages prevent the buildup that narrow passages encourage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Non-stick internal surfaces:<\/strong>&nbsp;UHMW-PE lined pump internals resist scale adhesion. Gypsum crystals that form during idle periods release from the smooth, hydrophobic surface when the pump restarts, rather than accumulating layer by layer as they do on rough metal surfaces.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Operational Practices That Prevent Clogging<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Minimum flow velocity:<\/strong>&nbsp;Maintain a minimum slurry velocity of 1.5\u20132.0 m\/s in pump suction and discharge piping. Lower velocities allow solids to settle and accumulate, eventually blocking the pipe or pump inlet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Post-shutdown flush:<\/strong>&nbsp;After each FGD system shutdown, flush the pump with clean water for 3\u20135 minutes to displace slurry from the casing, impeller, and seal chamber. This prevents gypsum scale from forming during the idle period. For extended shutdowns, drain the pump casing completely after flushing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Regular impeller clearance adjustment:<\/strong>&nbsp;As the impeller and casing wear, the clearance increases and efficiency drops. External adjustment mechanisms allow the clearance to be reset without pump disassembly. Check and adjust clearance at scheduled maintenance intervals.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Engineers at Changyu Pump recommend:<\/strong>&nbsp;For all FGD slurry pumps, specify a semi-open impeller with adjustable clearance and UHMW-PE lined casing. The combination of non-stick surfaces and wide flow passages minimizes clogging risk. A clean water flush after each shutdown \u2014 even brief \u2014 prevents gypsum scale from hardening in the pump.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. How to Select the Right FGD Slurry Pump?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">FGD slurry pump selection follows a structured process that begins with the specific slurry characteristics and proceeds through material selection, hydraulic sizing, and seal specification.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">FGD Process Stage Pump Selection<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">FGD Stage<\/th><th class=\"has-text-align-left\" data-align=\"left\">Slurry Type<\/th><th class=\"has-text-align-left\" data-align=\"left\">Key Requirement<\/th><th class=\"has-text-align-left\" data-align=\"left\">Recommended Pump<\/th><th class=\"has-text-align-left\" data-align=\"left\">Material<\/th><\/tr><\/thead><tbody><tr><td>Limestone preparation<\/td><td>Fresh limestone slurry, 25\u201330% solids<\/td><td>Maximum abrasion resistance<\/td><td>Slurry pump with wear-resistant lining<\/td><td>UHMW-PE lined<\/td><\/tr><tr><td>Absorber circulation<\/td><td>Mixed limestone\/gypsum slurry, 15\u201325% solids<\/td><td>Abrasion + scale resistance<\/td><td>Slurry pump with anti-scaling design<\/td><td>UHMW-PE lined<\/td><\/tr><tr><td>Gypsum bleed \/ transfer<\/td><td>Gypsum slurry, 15\u201325% solids<\/td><td>Scale resistance + moderate abrasion<\/td><td>Slurry pump with wide flow passages<\/td><td>UHMW-PE lined<\/td><\/tr><tr><td>Filtrate \/ wastewater<\/td><td>Acidic chloride solution, &lt; 1% solids<\/td><td>Corrosion resistance<\/td><td>Corrosion-resistant centrifugal pump<\/td><td>Duplex stainless steel (2205 minimum); 316L only for low-chloride (&lt; 500 mg\/L)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Five-Step FGD Slurry Pump Selection<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 1: Characterize the slurry.<\/strong>&nbsp;Measure solids concentration, particle size distribution, pH, temperature, and chloride content. These parameters determine the dominant wear mechanism \u2014 abrasion, corrosion, or both \u2014 and guide material selection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 2: Select the material.<\/strong>&nbsp;For slurry with solids content above 10%, specify UHMW-PE lined pumps. For clean FGD liquids, stainless steel pumps provide cost-effective corrosion resistance. High-chrome alloy and rubber-lined pumps are alternative options where UHMW-PE is not available, but expect shorter service life.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 3: Choose the impeller type.<\/strong>&nbsp;For FGD slurry service, specify a semi-open impeller with adjustable clearance. The wide flow path resists clogging, and the adjustable clearance maintains efficiency as wear occurs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 4: Select the seal arrangement.<\/strong>&nbsp;FGD slurry contains fine particles that destroy standard mechanical seals. Specify an external clean water seal flush system or a double mechanical seal with barrier fluid. The flush water prevents slurry from entering the seal faces and carries away any particles that do penetrate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 5: Size the pump.<\/strong>&nbsp;Calculate the required flow rate and total dynamic head. Apply slurry derating factors to account for the increased friction losses and reduced efficiency compared to water. Size the motor with a minimum 1.15 service factor for continuous duty. For FGD applications, specify a pump speed of 1,450 rpm or lower to reduce wear rate and extend component life.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5. How to Extend FGD Slurry Pump Service Life?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">FGD slurry pump wear life is determined by three controllable factors: operating speed, impeller clearance management, and maintenance practices.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Speed Selection<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Operating speed has a disproportionate effect on wear rate. The relationship is approximately exponential \u2014 doubling the speed increases the wear rate by a factor of three to four, not two. This is because wear is a function of both the number of particle impacts (proportional to speed) and the energy of each impact (proportional to the square of speed).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For FGD slurry pumps, specify 4-pole motors (1,450\u20131,500 rpm at 50 Hz) rather than 2-pole motors (2,900\u20133,000 rpm). The lower speed pump will be larger and more expensive initially, but the extended service life and reduced maintenance costs typically recover this premium within the first two years of operation. Lower speed (1,450 rpm) reduces wear rate by a factor of three to four compared to 2,900 rpm operation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Impeller Clearance Management<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">As the impeller and casing wear, the clearance between the impeller front shroud and the suction-side liner increases. Internal recirculation rises, reducing flow and efficiency. External impeller adjustment allows the clearance to be reset to the original specification without opening the pump \u2014 typically a 15-minute procedure compared to several hours for a complete wet-end replacement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Check impeller clearance monthly during the first six months of operation to establish the wear rate. Adjust as needed to maintain the clearance within the manufacturer&#8217;s specified range. When the adjustment range is exhausted, plan the wet-end replacement at the next scheduled maintenance window.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Preventive Maintenance Schedule<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Interval<\/th><th class=\"has-text-align-left\" data-align=\"left\">Action<\/th><th class=\"has-text-align-left\" data-align=\"left\">Purpose<\/th><\/tr><\/thead><tbody><tr><td>Weekly<\/td><td>Check pump vibration, bearing temperature, and discharge pressure<\/td><td>Early detection of developing problems<\/td><\/tr><tr><td>Monthly<\/td><td>Measure flow rate at constant speed; compare to baseline<\/td><td>Detects impeller wear \u2014 flow dropping 10% below baseline indicates adjustment or replacement needed<\/td><\/tr><tr><td>Quarterly<\/td><td>Inspect mechanical seal flush system; check flush water flow and pressure<\/td><td>Prevents seal failure from inadequate flushing<\/td><\/tr><tr><td>Annually<\/td><td>Full pump inspection; measure casing and impeller wear; replace wear components as indicated<\/td><td>Scheduled maintenance prevents unplanned downtime<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Engineers at Changyu Pump have observed:<\/strong>&nbsp;The most common cause of premature FGD pump failure \u2014 beyond material selection \u2014 is operating the pump with excessive impeller clearance. A pump running with clearance beyond the manufacturer&#8217;s maximum loses 15\u201325% of its design flow and experiences accelerated casing wear from the recirculating slurry. Monthly clearance checks and timely adjustment are the most cost-effective maintenance activity for FGD slurry pumps.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The total cost of ownership for FGD slurry pumps is dominated by unplanned downtime and wet-end replacement frequency \u2014 not by initial purchase price. A UHMW-PE lined pump with a higher initial cost but three times the service life of a high-chrome alloy pump delivers significantly lower 5-year TCO.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">6. Case Study of FGD Slurry Pump: Tripling Wear Life in a Power Plant FGD System<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A coal-fired power plant in India operated four high-chrome alloy slurry pumps to transfer limestone slurry from the preparation system to the absorber towers. The slurry contained 28% limestone solids by weight with angular particle morphology (Mohs 3\u20134). Pump speed: 1,450 rpm. Flow rate: 200 m\u00b3\/h at 35 m head.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The high-chrome alloy wet-end components \u2014 impeller, volute liner, and throatbush \u2014 required replacement every 6\u20138 months. Each replacement cost approximately $8,000 in parts and required 12 hours of downtime per pump. With four pumps, the plant averaged one wet-end replacement every two months, plus occasional emergency repairs for seal failures and clogging.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Root cause analysis by Changyu Pump engineers confirmed that the high-chrome alloy (650 HB) was being cut by the angular limestone particles. While the chromium carbides in the alloy were harder than the limestone particles, the softer martensitic matrix surrounding the carbides was being preferentially worn, undermining the carbides and accelerating material loss. Additionally, gypsum scale was accumulating on the metal volute surfaces during brief shutdowns, requiring mechanical cleaning that further damaged the wear surfaces.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"769\" src=\"https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/zinc-sulfate-slurry-pump-2-1024x769.webp\" alt=\"Case of FGD Slurry Pump\" class=\"wp-image-3383\" srcset=\"https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/zinc-sulfate-slurry-pump-2-1024x769.webp 1024w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/zinc-sulfate-slurry-pump-2-300x225.webp 300w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/zinc-sulfate-slurry-pump-2-150x113.webp 150w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/zinc-sulfate-slurry-pump-2-768x576.webp 768w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/zinc-sulfate-slurry-pump-2-16x12.webp 16w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/zinc-sulfate-slurry-pump-2.webp 1279w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Changyu Pump replaced the four high-chrome alloy pumps with UHB Series UHMW-PE lined slurry pumps. The UHMW-PE lining provided superior abrasion resistance \u2014 the material absorbed particle impact energy rather than being cut. The non-stick surface eliminated gypsum scale accumulation. Semi-open impellers with adjustable clearance maintained design flow rates between scheduled maintenance intervals.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After 18 months of continuous operation: the first UHMW-PE wet-end inspection showed uniform, predictable wear with an estimated service life of 24\u201330 months \u2014 a three- to four-fold improvement over the high-chrome alloy pumps. Unplanned downtime from pump failures dropped to zero. The plant standardized on UHMW-PE lined pumps for all FGD slurry services during the next overhaul cycle.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Key takeaway<\/strong>: In FGD slurry service, the abrasive wear mechanism that destroys metal pumps is fundamentally different from the wear mechanism in UHMW-PE lined pumps. Metal pumps are cut by sharp particles as the softer matrix erodes; UHMW-PE absorbs the impact through elastic deformation. The result is a service life extension of three to four times, with the material cost premium recovered within the first avoided wet-end replacement.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">7. Changyu Pump FGD Slurry Pump Solutions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Changyu Pump manufactures two pump series suitable for FGD slurry and process applications.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">FGD Pump Product Selection Guide<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">FGD Application<\/th><th class=\"has-text-align-left\" data-align=\"left\">Primary Challenge<\/th><th class=\"has-text-align-left\" data-align=\"left\">Recommended Series<\/th><th class=\"has-text-align-left\" data-align=\"left\">Key Feature<\/th><\/tr><\/thead><tbody><tr><td>Limestone slurry, gypsum slurry<\/td><td>Abrasion + corrosion + scaling<\/td><td>UHB Series<\/td><td>UHMW-PE lined; semi-open impeller; anti-scaling<\/td><\/tr><tr><td>FGD filtrate, process water<\/td><td>Corrosion without solids<\/td><td>HB Series<\/td><td>All stainless steel; select 316L for low-chloride process water; specify 2205 or 2507 for high-chloride FGD wastewater<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">UHB Series \u2014 UHMW-PE Lined Slurry Pump for FGD Limestone and Gypsum<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/UHB-Series-Horizontal-Phosphoric-Acid-Slurry-Pump_2.webp\" alt=\"UHB Series \u2014 UHMW-PE Lined Slurry Pump for FGD Limestone and Gypsum\" class=\"wp-image-1826\" srcset=\"https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/UHB-Series-Horizontal-Phosphoric-Acid-Slurry-Pump_2.webp 800w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/UHB-Series-Horizontal-Phosphoric-Acid-Slurry-Pump_2-300x225.webp 300w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/UHB-Series-Horizontal-Phosphoric-Acid-Slurry-Pump_2-768x576.webp 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"UHB and CYG series slurry pump\" width=\"720\" height=\"405\" src=\"https:\/\/www.youtube.com\/embed\/HJKft5LWZfE?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Steel-lined UHMW-PE centrifugal pump designed for corrosive and abrasive slurries. Semi-open impeller handles high solids content without clogging. The UHMW-PE lining provides combined abrasion resistance, chemical inertness across the full FGD pH range, and a non-stick surface that resists gypsum scale buildup. External impeller adjustment maintains design efficiency as wear occurs. Widely used in coal-fired power plant FGD systems for limestone slurry, gypsum slurry, and absorber circulation.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Parameter<\/th><th class=\"has-text-align-left\" data-align=\"left\">Specification<\/th><\/tr><\/thead><tbody><tr><td>Flow rate<\/td><td>3\u20132,600 m\u00b3\/h<\/td><\/tr><tr><td>Head<\/td><td>5\u2013100 m<\/td><\/tr><tr><td>Motor power<\/td><td>0.75\u2013300 kW<\/td><\/tr><tr><td>Speed<\/td><td>750\u20132,900 r\/min (1,450 rpm recommended for FGD)<\/td><\/tr><tr><td>Temperature<\/td><td>-20\u00b0C to 90\u00b0C<\/td><\/tr><tr><td>Lining material<\/td><td>UHMW-PE<\/td><\/tr><tr><td>Solids capacity<\/td><td>Up to 30% by weight<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/changyupump.com\/product\/chemical-horizontal-slurry-pump\/\" target=\"_blank\" rel=\"noreferrer noopener\">View UHB Series \u2192<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">HB Series \u2014 Stainless Steel Pump for FGD Process Water<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"900\" src=\"https:\/\/changyupump.com\/wp-content\/uploads\/2026\/04\/Abrasive-Slurry-Pump-1-2.webp\" alt=\"HB Series \u2014 Stainless Steel Pump for FGD Process Water\" class=\"wp-image-4699\" style=\"width:800px;height:auto\" srcset=\"https:\/\/changyupump.com\/wp-content\/uploads\/2026\/04\/Abrasive-Slurry-Pump-1-2.webp 1200w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/04\/Abrasive-Slurry-Pump-1-2-300x225.webp 300w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/04\/Abrasive-Slurry-Pump-1-2-1024x768.webp 1024w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/04\/Abrasive-Slurry-Pump-1-2-150x113.webp 150w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/04\/Abrasive-Slurry-Pump-1-2-768x576.webp 768w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/04\/Abrasive-Slurry-Pump-1-2-16x12.webp 16w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption class=\"wp-element-caption\">Abrasive Slurry Pump<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Suitable for stainless steel slurry pumps containing particulate matter and corrosive media.\" width=\"720\" height=\"405\" src=\"https:\/\/www.youtube.com\/embed\/0UxciVQFQUg?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Horizontal centrifugal pump designed to ISO 2858 with all-stainless steel wetted construction. Suitable for FGD filtrate water, process water, and clean fluid applications where corrosion resistance is required but solids are absent. Available in 304, 316L, 2205, and 2507 grades. Select 316L for low-chloride process water; specify 2205 or 2507 for high-chloride FGD wastewater to prevent pitting and crevice corrosion.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Parameter<\/th><th class=\"has-text-align-left\" data-align=\"left\">Specification<\/th><\/tr><\/thead><tbody><tr><td>Flow rate<\/td><td>10\u201360 m\u00b3\/h<\/td><\/tr><tr><td>Head<\/td><td>20\u2013120 m<\/td><\/tr><tr><td>Motor power<\/td><td>3\u201345 kW<\/td><\/tr><tr><td>Speed<\/td><td>2,900 r\/min<\/td><\/tr><tr><td>Temperature<\/td><td>-20\u00b0C to 120\u00b0C<\/td><\/tr><tr><td>Materials<\/td><td>304, 316L, 2205, 2507<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/changyupump.com\/product\/hb-abrasive-slurry-pump\/\" target=\"_blank\" rel=\"noreferrer noopener\">View HB Series \u2192<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">FAQs about FGD Slurry Pumps<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: What is the best material for FGD slurry pumps?<\/strong><br>A: UHMW-PE (ultra-high molecular weight polyethylene) lined pumps provide the best combination of abrasion resistance, corrosion resistance, and anti-scaling properties for limestone and gypsum slurry service. They outlast high-chrome alloy pumps by two to four times in typical FGD applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: How do I prevent gypsum scale from clogging my FGD pump?<\/strong><br>A: Three measures work together: specify a pump with non-stick UHMW-PE lined surfaces, use a semi-open impeller (no front shroud) with wide flow passages, and implement a clean water flush after each shutdown to displace slurry before gypsum crystallizes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: What pump speed is best for FGD slurry service?<\/strong><br>A: Specify 4-pole motors (1,450\u20131,500 rpm) rather than 2-pole motors (2,900\u20133,000 rpm). Lower speed reduces wear rate by a factor of three to four compared to 2,900 rpm operation and significantly extends wet-end component life.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: What type of impeller is best for FGD gypsum slurry?<\/strong><br>A: A semi-open impeller with adjustable clearance. The open design \u2014 with no front shroud \u2014 eliminates the confined space where solids accumulate in closed impellers. Adjustable clearance allows the pump to maintain design efficiency as wear occurs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: How often should FGD slurry pumps be serviced?<\/strong><br>A: Weekly vibration and pressure checks. Monthly flow rate measurement to detect wear. Quarterly seal flush system inspection. Annual full pump inspection with wear component replacement as indicated. Impeller clearance should be checked monthly and adjusted as needed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: Can I use 316L stainless steel for FGD wastewater pumps?<\/strong><br>A: Only for low-chloride applications (&lt; 500 mg\/L). FGD wastewater typically contains high chloride levels (often 20,000\u201350,000 mg\/L) from the coal combustion process. For high-chloride FGD wastewater, duplex 2205 or 2507 is the minimum requirement to prevent pitting and crevice corrosion.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Changyu Pump Engineer&#8217;s Avoidance Checklist<\/h2>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Specify UHMW-PE lined pumps for all FGD slurry services. The material premium is recovered within the first avoided wet-end replacement.<\/li>\n\n\n\n<li>Select 4-pole motors (1,450 rpm) for FGD slurry pumps. Lower speed dramatically extends wear life \u2014 by a factor of three to four compared to 2,900 rpm.<\/li>\n\n\n\n<li>Specify semi-open impellers with external clearance adjustment. The absence of a front shroud eliminates solids accumulation, and adjustable clearance enables efficiency recovery without pump disassembly.<\/li>\n\n\n\n<li>Install external clean water seal flush systems. FGD slurry particles will destroy standard mechanical seals without proper flushing.<\/li>\n\n\n\n<li>Maintain a minimum slurry velocity of 1.5\u20132.0 m\/s in suction and discharge piping to prevent solids settling.<\/li>\n\n\n\n<li>Flush pumps with clean water for 3\u20135 minutes after each shutdown. This prevents gypsum scale from hardening during idle periods.<\/li>\n\n\n\n<li>Check impeller clearance monthly and adjust to maintain design specification. Excessive clearance accelerates casing wear and reduces flow.<\/li>\n\n\n\n<li>Keep spare wet-end components \u2014 impeller, volute liner, throatbush \u2014 in inventory for all critical FGD pumps. Lead times on replacement parts should not dictate maintenance scheduling.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An <strong>FGD slurry pump<\/strong> operates at the intersection of three destructive forces: the abrasive wear of limestone particles, the corrosive chemistry of the slurry environment, and the scaling tendency of gypsum. A pump material that resists only one of these challenges \u2014 such as high-chrome alloy, which handles abrasion but not scaling \u2014 will fail prematurely from the other two.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">UHMW-PE lined pumps have emerged as the preferred solution for FGD slurry service because they address all three challenges simultaneously. Unlike metal pumps that are progressively cut as sharp particles erode the softer matrix surrounding hard carbides, UHMW-PE absorbs particle impact energy through elastic deformation. Its chemical inertness eliminates corrosion as a failure mechanism across the full FGD pH range. Its non-stick surface prevents gypsum scale from accumulating. When combined with correct speed selection, semi-open impeller design without a front shroud, and disciplined maintenance practices, UHMW-PE lined FGD slurry pumps deliver reliable, predictable service life that supports uninterrupted power plant operation.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"750\" src=\"https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/Changyu-Pump-1.webp\" alt=\"Factory of FGD slurry pump: Changyu Pump\" class=\"wp-image-6341\" srcset=\"https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/Changyu-Pump-1.webp 1000w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/Changyu-Pump-1-300x225.webp 300w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/Changyu-Pump-1-150x113.webp 150w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/Changyu-Pump-1-768x576.webp 768w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/Changyu-Pump-1-16x12.webp 16w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Changyu Pump&#8217;s engineering team<\/strong> provides tailored technical assessments for FGD slurry pump applications \u2014 covering slurry characterization, material selection, hydraulic sizing, and seal specification. Two decades of manufacturing experience across power generation and industrial sectors inform every recommendation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/changyupump.com\/contacts\/\" target=\"_blank\" rel=\"noreferrer noopener\">Contact Changyu Pump for a free technical assessment \u2192<\/a><\/p>\n\n\n<div class=\"wp-block-kadence-advanced-form wp-block-kadence-advanced-form1246-cpt-id kb-adv-form-label-style-normal kb-adv-form-input-size-standard kb-form-basic-style\"><form id=\"kb-adv-form-1246-cpt-id\" class=\"kb-advanced-form\" method=\"post\">\n<style>.kb-row-layout-id16_395842-3c > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id16_395842-3c > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id16_395842-3c > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:var(--global-kb-gap-md, 2rem);padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;grid-template-columns:repeat(2, minmax(0, 1fr));}.kb-row-layout-id16_395842-3c > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id16_395842-3c > .kt-row-column-wrap{grid-template-columns:repeat(2, minmax(0, 1fr));}}@media all and (max-width: 767px){.kb-row-layout-id16_395842-3c > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id16_395842-3c alignnone wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-equal kt-tab-layout-inherit kt-mobile-layout-row kt-row-valign-top\">\n<style>.kadence-column16_3a38e5-5d > .kt-inside-inner-col,.kadence-column16_3a38e5-5d > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column16_3a38e5-5d > 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.kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column16_be3802-0b\"><div class=\"kt-inside-inner-col\"><div class=\"kb-adv-form-field kb-adv-form-text-type-input kb-adv-form-infield-type-input kb-field124648086d-59 wp-block-kadence-advanced-form-email\"><label class=\"kb-adv-form-label\" for=\"field124648086d-59\">Email<span class=\"kb-adv-form-required\">*<\/span><\/label><input name=\"field48086d-59\" id=\"field124648086d-59\" data-label=\"Email\" type=\"email\" placeholder=\"\" value=\"\" data-type=\"email\" class=\"kb-field kb-email-field\" data-required=\"yes\" required aria-required=\"true\"\/><\/div><\/div><\/div>\n\n<\/div><\/div>\n\n<div class=\"kb-adv-form-field kb-adv-form-text-type-input kb-adv-form-infield-type-input kb-field124697066f-d3 wp-block-kadence-advanced-form-text\"><label class=\"kb-adv-form-label\" for=\"field124697066f-d3\">Whatsapp\/Phone<\/label><input name=\"field97066f-d3\" id=\"field124697066f-d3\" data-label=\"Whatsapp\/Phone\" type=\"text\" placeholder=\"\" value=\"\" data-type=\"text\" class=\"kb-field kb-text-field\" data-required=\"no\" \/><\/div>\n\n<div class=\"kb-adv-form-field kb-adv-form-text-type-input kb-adv-form-infield-type-input kb-field1246ae3276-7e wp-block-kadence-advanced-form-textarea\"><label class=\"kb-adv-form-label\" for=\"field1246ae3276-7e\">Message<span class=\"kb-adv-form-required\">*<\/span><\/label><textarea name=\"fieldae3276-7e\" id=\"field1246ae3276-7e\" rows=\"4\"  data-label=\"Message\" placeholder=\"\" data-type=\"textarea\" class=\"kb-field kb-textarea-field\" data-required=\"yes\" required aria-required=\"true\"><\/textarea><\/div>\n\n<style>ul.menu .kb-submit-field .kb-btnd4ade1-86.kb-button{width:initial;}.kb-submit-field .kb-btnd4ade1-86.kb-button{background:var(--global-palette1, #3182CE);}.kb-submit-field .kb-btnd4ade1-86.kb-button:hover, .kb-submit-field .kb-btnd4ade1-86.kb-button:focus{background:var(--global-palette2, #2B6CB0);}.kb-submit-field.kb-fieldd4ade1-86{justify-content:flex-start;}<\/style><div class=\"kb-adv-form-field kb-submit-field kb-fieldd4ade1-86 wp-block-kadence-advanced-form-submit\"><button class=\"kb-button kt-button button kb-adv-form-submit-button kb-btnd4ade1-86 kt-btn-size-standard kt-btn-width-type-auto kb-btn-global-inherit kt-btn-has-text-true kt-btn-has-svg-false wp-block-button__link\" type=\"submit\"><span class=\"kt-btn-inner-text\">Submit<\/span><\/button><\/div>\n<input type=\"hidden\" name=\"_kb_adv_form_post_id\" value=\"1246\"><input type=\"hidden\" name=\"action\" value=\"kb_process_advanced_form_submit\"><input type=\"hidden\" name=\"_kb_adv_form_id\" value=\"1246-cpt-id\"><\/form><\/div>\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the best material for FGD slurry pumps?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"UHMW-PE (ultra-high molecular weight polyethylene) lined pumps provide the best combination of abrasion resistance, corrosion resistance, and anti-scaling properties for limestone and gypsum slurry service. They outlast high-chrome alloy pumps by two to four times.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I prevent gypsum scale from clogging my FGD pump?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Specify a pump with non-stick UHMW-PE lined surfaces, use a semi-open impeller (no front shroud) with wide flow passages, and implement a clean water flush after each shutdown to displace slurry before gypsum crystallizes.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What pump speed is best for FGD slurry service?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Specify 4-pole motors (1,450\u20131,500 rpm) rather than 2-pole motors (2,900\u20133,000 rpm). Lower speed reduces wear rate by a factor of three to four compared to 2,900 rpm operation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What type of impeller is best for FGD gypsum slurry?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A semi-open impeller with adjustable clearance. The open design eliminates the confined space where solids accumulate in closed impellers. Adjustable clearance allows the pump to maintain design efficiency as wear occurs.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How often should FGD slurry pumps be serviced?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Weekly vibration and pressure checks. Monthly flow rate measurement to detect wear. Quarterly seal flush system inspection. Annual full pump inspection with wear component replacement as indicated.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use 316L stainless steel for FGD wastewater pumps?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Only for low-chloride applications (< 500 mg\/L). FGD wastewater typically contains high chloride levels (20,000\u201350,000 mg\/L). For high-chloride FGD wastewater, duplex 2205 or 2507 is the minimum requirement.\"\n      }\n    }\n  ]\n}\n<\/script>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quick Answer An&nbsp;FGD slurry pump&nbsp;is a heavy-duty pump engineered to handle the abrasive limestone slurry and scaling-prone&#8230;<\/p>","protected":false},"author":2,"featured_media":6337,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[12],"tags":[],"class_list":["post-6186","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"taxonomy_info":{"category":[{"value":12,"label":"Blog"}]},"featured_image_src_large":["https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/FGD-Slurry-Pump-Limestone-Gypsum-Transfer-Guide.webp",1000,750,false],"author_info":{"display_name":"Changyu_","author_link":"https:\/\/changyupump.com\/ar\/author\/changyu_\/"},"comment_info":0,"category_info":[{"term_id":12,"name":"Blog","slug":"blog","term_group":0,"term_taxonomy_id":12,"taxonomy":"category","description":"","parent":0,"count":152,"filter":"raw","cat_ID":12,"category_count":152,"category_description":"","cat_name":"Blog","category_nicename":"blog","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/posts\/6186","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/comments?post=6186"}],"version-history":[{"count":8,"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/posts\/6186\/revisions"}],"predecessor-version":[{"id":6343,"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/posts\/6186\/revisions\/6343"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/media\/6337"}],"wp:attachment":[{"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/media?parent=6186"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/categories?post=6186"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/tags?post=6186"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}