Centrifugal Pump

The following is a detailed explanation of the differences in shaft power calculation for three types of industrial pumps (centrifugal pumps, slurry pumps, and magnetic pumps), including specific formulas and correction factors:   1. Shaft power calculation for centrifugal pumps: Basic formula: P=Q×H×ρ×g/3600/η   Parameter description: Q: flow rate (m³/h) H: head (m) ρ: medium density (kg/m³) η: pump efficiency (usually 0.6~0.9)   Correction for particle-containing media: When the medium contains solid particles (such as slurry, sewage), the wear coefficient (K) needs to be increased to compensate for impeller wear and decreased efficiency:   P correction=P×K (K=1.1~1.3)   Case: Transporting sewage with 10% sand content (ρ=1100kg/m³, Q=100m/h, H=25m, η=0.7, K=1.2) P=100×25×1100×9.81/3600/0.7×1.2≈15.3KW   2. Calculation of slurry pump shaft power:   Special formula: N=H×Q×A×g/n/3600   Parameter description: A: Slurry density (kg/m³), which needs to be obtained through actual measurement or calculation: A=ρliquid×(1+Cv) (Cv is the solid volume concentration, for example, when the solid content is 30%, Cv=0.3) n: Pump efficiency (usually 0.4~0.6)   Case: Transporting iron ore slurry ρ liquid = 1200kg/m³, Cv = 0.25, Q = 80m³/h, H = 20m, n = 0.5) A = 1200 × (1 + 0.25) = 1500kg/m³ N = 20 × 80 × 1500 × 9.81/3600/0.5 ≈ 26.2kW   3. Calculation of magnetic pump shaft power: Correction formula: P magnetic pump = P/η magnetic (η magnetic = 0.92 ~ 0.97)   Parameter description: Magnetic transmission efficiency (usually 92% ~ 97%) If calculated directly according to the centrifugal pump formula, an additional 3% ~ 8% power is required   Case: Transporting hydrochloric acid (Q=30m³/h, H=15m, ρ=1259kg/m³, η=0.75, ηmagnetic=0.95): Pbase=30×15×1250×9.81/3600/0.75≈3.1KW   Reasonable calculation of shaft power can improve the energy efficiency of the pump system by more than 20%. This article deeply analyzes the calculation method of industrial pump shaft power to help you achieve accurate selection and energy-saving optimization.

In industrial fluid delivery systems, chemical pump motors are the core of industrial equipment and directly determine the operating efficiency and system stability. The selection of chemical pump motors represents a complex engineering process, in which configuration decisions have a significant impact on the productivity, reliability and service life of the system. This article systematically outlines the workflow and key considerations for chemical pump motor selection.   The basic principles of chemical pump motor selection follow the following key aspects:   1. Define operating conditions and requirements Before selecting a chemical pump motor, it is necessary to fully understand the operating environment, media characteristics, pressure levels, flow rates and performance benchmarks. These parameters fundamentally determine the motor specifications and installation configuration.   Corrosive media? For corrosive fluids, corrosion-resistant materials (316L stainless steel, Hastelloy) and ceramic coatings are used for enhanced protection.   High temperature operation? For environments exceeding 120°C, H-class insulated chemical pump motors are preferred; for conditions below -20°C, antifreeze lubrication systems are implemented.   Explosion risk? Select chemical pump motors with Ex d IIC T4 certification for hazardous areas, flameproof models are recommended in Zone 1 environments.   2. Determine chemical pump motor category Evaluate chemical pump motor types (AC/DC/stepper) based on operational needs through comparative analysis of technical specifications to determine the best solution for specific working conditions.   3. Evaluate performance indicators Key parameters including rated power, speed, torque characteristics and vibration frequency need to be carefully matched to ensure smooth operation, energy saving and noise reduction while preventing mechanical overload.   4. Perform comprehensive sizing calculations Parameterize system requirements and chemical pump motor specifications (power/speed/torque) through engineering calculations, and then iteratively optimize the selection plan.   5. Verify selection results Evaluate the shortlisted chemical pump motors in multiple dimensions to verify whether they meet technical specifications (power efficiency, etc.), operational reliability, durability and environmental suitability to ensure extended service life under specified operating conditions.   In short, chemical pump motor selection is a complex system engineering challenge that requires balancing technical parameters, economic factors and operational performance. By systematically applying selection principles and rigorous calculation verification, engineers can develop chemical pump motor configuration solutions that meet both practical requirements and high technical standards.

The wearing parts are the most vulnerable parts of the slurry pump. During use, repair and maintenance, special care is required for the wearing parts. UHB slurry pump is a cantilever single-stage single-suction centrifugal pump, which is specially designed and developed for conveying corrosive media containing fine particles. The pump is made of steel-lined ultra-high molecular weight polyethylene, which is a new generation of corrosion-resistant and wear-resistant engineering plastics for pumps. Its outstanding advantage is that it has excellent wear resistance, impact resistance, creep resistance and excellent corrosion resistance among all plastics. So what are the vulnerable parts of a pump and what should be paid attention to? The pump casing of the slurry pump is generally a cast iron part, and the special pump has an inner lining material, which is prone to cracks under the action of mechanical force or thermal stress. When the slurry pump is impacted by cavitation during work or frozen in winter without draining the accumulated water in the pump casing, it is also prone to rupture. If the damage is serious and cannot be repaired, a new pump casing should be replaced The pump shaft of the slurry pump is generally a carbon steel part, but it is also easily damaged due to manufacturing quality, use or installation. The pump shaft may crack, fold, wear the journal, damage the thread, etc., and may also break. If the damage is serious and cannot be repaired, a new shaft should be replaced. The impeller is an important working part of the slurry pump and is made of cast iron. It is also easily damaged due to manufacturing quality and use. The impeller may crack, and the surface may form holes or perforations due to cavitation. The blades may become thinner or wear unevenly due to long-term grinding, or even be crushed by debris. Some defects can be repaired; some defects cannot be repaired, that is, a new impeller should be replaced. The bearing bush of the sliding bearing is generally cast from copper-tin alloy, which has poor wear resistance and is one of the vulnerable parts that are easy to wear and burn out. The bearing bush can generally be repaired (repair) or replaced with a new one. slurry pump manufacturer slurry pump is suitable for non-ferrous metal smelting industry: especially for various acid liquids, corrosive ore slurry, slurry (for filter press), electrolyte, sewage and other media transportation in wet smelting of lead, zinc, gold, silver, copper, manganese, cobalt, rare earth, etc. The chemical slurry pump is a pump that can adapt to various working conditions, such as conveying acid, alkaline clear liquid or slurry; various corrosive slurries in the smelting industry; various dilute acids in the sulfuric acid industry; various sewage in the environmental protection industry, etc. The pump is both corrosion-resistant and wear-resistant, and has a wide range of uses. The average service life of rolling bearings is generally 5,000 hours, but improper installation, long service time or poor maintenance can also cause wear or damage. Except for individual parts of rolling bearings that can be replaced with new ones, the entire part must generally be replaced.      The mouth ring is also called the leakage reduction or wear reduction ring. It is one of the parts that are easily worn in the slurry pump. It can be repaired or replaced with a new one after wear. When replacing a new leakage reduction ring, its inner diameter should be configured according to the outer diameter (outer edge diameter) of the impeller (referring to the wheel with moving blades). If the outer diameter of the impeller water inlet is worn, it can be turned to eliminate grooves and ovals, and then a leakage reduction ring with a reduced inner diameter can be configured. The outer diameter of the impeller water inlet can generally be turned three times.