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Calculation method of industrial pump shaft power

2025-04-16

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:

Shaft power calculation

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:

Shaft power calculation

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.

Difference between lined fluoroplastic centrifugal pump and perfluoroplastic pump Comprehensive Guide

2025-04-16

In the chemical, pharmaceutical, environmental protection and other industries, the transportation of corrosive media remains a key challenge. As a core fluid transportation equipment, the material selection of centrifugal pumps directly affects production safety and cost control.

 

Among them, lined fluoroplastic centrifugal pumps and perfluoroplastic pumps have become the mainstream choice due to their excellent corrosion resistance.

 

But what is the difference between lined fluoroplastic centrifugal pumps and perfluoroplastic pumps? How to choose a suitable pump according to the working conditions? This article conducts an in-depth analysis based on international standards and engineering practices.

 

Difference 1: Structural difference between lined fluoroplastic centrifugal pumps and perfluoroplastic pumps

Difference between lined fluoroplastic centrifugal pump and perfluoroplastic pump

1. Lined fluoroplastic centrifugal pump

Structural features: Metal shell (such as cast iron, stainless steel) lined with fluoroplastic (such as PTFE, F46). Impeller and pump cover are metal inserts coated with fluoroplastic.

 

Advantages of lined fluoroplastic centrifugal pumps:

 

High mechanical strength, can withstand pipeline weight and mechanical impact, suitable for high pressure and large flow occasions.

 

Wide operating temperature range (-20℃ to 180℃). Use bellows mechanical seal to minimize leakage risk.

 

Typical model: IHF series, widely used for conveying acid, alkali and salt solutions.

 

2. Perfluoroplastic pump

Structural features: The pump head (including pump body and impeller) is all made of fluoroplastic (such as PTFE, FEP, PFA) injection molding, and there is no metal contact with the medium.

 

Advantages of perfluoroplastic pump:

 

Resistant to strong corrosion (such as concentrated sulfuric acid, hydrofluoric acid) and short-term high temperature (up to 200°C).

 

Smooth surface, reducing fluid resistance and improving efficiency.

 

Typical model: FSB series, suitable for small-diameter pipelines and low-flow occasions.

 

Difference 2: Performance difference between lined fluoroplastic centrifugal pump and perfluoroplastic pump

Difference between lined fluoroplastic centrifugal pump and perfluoroplastic pump

Difference 3: Application scenarios and media of lined fluoroplastic centrifugal pump and perfluoroplastic pump

 

1. Application and applicable media of lined fluoroplastic centrifugal pump:

 

Chemical industry: conveying sulfuric acid (concentration ≤50%) and nitric acid.

 

Pharmaceutical industry: high-purity liquid transportation, in line with FDA hygiene standards.

 

2. Application and applicable media of perfluoroplastic pumps:

 

Electroplating industry: circulating highly corrosive liquids such as hydrofluoric acid and chromic acid.

 

Semiconductor industry: ultra-pure chemical transportation to prevent metal ion contamination.

 

Difference 4: Corrosion-resistant pump selection guide

Difference between lined fluoroplastic centrifugal pump and perfluoroplastic pump

1. Medium characteristics

Perfluoroplastic pumps are preferred for highly corrosive media (such as hydrofluoric acid and molten alkali).

 

Lined fluoroplastic centrifugal pumps are used for particle-containing media or high-temperature media (such as mud and boiler water), with better wear resistance and pressure resistance.

 

2. Process parameters

Flow rate and head: Perfluoroplastic pumps are suitable for low flow rates (≤30m³/h) and low head (≤30m), and lined pumps can meet larger flow requirements.

 

Pipe diameter: Perfluoroplastic pumps are suitable for pipe diameters ≤80mm, and lined pumps support larger pipe diameters.

 

3. Cost and maintenance

For customers with moderate corrosion and limited budgets, perfluoroplastic pumps have a higher cost-effectiveness.

 

Lined pumps can reduce long-term continuous operation costs due to simpler maintenance and longer service life.

 

4. International standards

Lined pumps comply with ISO 2858 (centrifugal pump design) and ASME B73.3 (chemical pump standard).

 

Perfluoroplastic pump materials require ASTM D4894 (PTFE molding standard) certification.

 

Difference 5: Summary and recommendations

 

Perfluoroplastic pumps are preferred: extremely corrosive, particle-free, low-flow scenarios.

 

Lined fluoroplastic centrifugal pumps are preferred: media containing solids, high pressure/temperature, and long-term operation.

The difference between magnetic drive pumps and centrifugal pumps a comprehensive analysis

2025-04-16

Centrifugal pumps and magnetic drive pumps are widely used in daily industrial production, especially in the fields of chemical, pharmaceutical and environmental protection. These two chemical pumps have their own advantages in practical applications.

 

Although traditional centrifugal pumps are widely used, their leakage risks and maintenance difficulties have always been the pain points of the industry. In contrast, magnetic drive pumps have become the first choice for dangerous fluid transportation with their "zero leakage" characteristics.

 

This article deeply explores the difference between magnetic drive pumps and centrifugal pumps, and provides enterprises with a scientific basis for equipment selection.

 

The difference between magnetic drive pumps and centrifugal pumps

 

The difference between magnetic drive pumps and centrifugal pumps 1: working principle

 

1. Magnetic drive pump: magnetic field non-contact seal

 

magnetic drive pumps

 

The zero leakage principle of magnetic drive pumps is derived from its innovative magnetic coupling transmission technology. Power is indirectly transmitted from the motor to the impeller through the magnetic interaction between the inner and outer magnetic rotors, without the need for physical shaft connection.

 

This design completely abandons the traditional mechanical seal, completely encloses the medium in a stationary sealing shell, and achieves "zero leakage". The magnetic drive efficiency of magnetic drive pumps exceeds 95%, which is an ideal choice for conveying hazardous media such as hydrofluoric acid and liquid chlorine.

 

2. Centrifugal pump: mechanical drive by centrifugal force

 

Centrifugal pump

 

Centrifugal pumps rely on the centrifugal force generated by the high-speed rotation of the impeller to push the fluid. The motor directly drives the impeller shaft through the coupling, and the dynamic mechanical seal (such as packing seal or mechanical seal) is the key anti-leakage component.

However, the defects of the mechanical seal of the centrifugal pump are quite obvious - about 30% of centrifugal pump failures are caused by seal failure, especially under high temperature and high pressure conditions.

 

The difference between magnetic drive pumps and centrifugal pumps 2: structural design

 

1. Magnetic drive pump structure

The magnetic drive pump consists of three parts: pump body, magnetic drive assembly and motor. The magnetic drive assembly includes an outer/inner magnetic rotor and a non-magnetic sealing shell.

When the motor drives the outer rotor, the inner rotor (connected to the impeller) rotates synchronously to achieve non-contact power transmission. The sealing shell is made of corrosion-resistant materials such as Hastelloy or ceramics, which acts as a static seal to isolate the rotor and prevent medium leakage.

 

2. Centrifugal pump structure

The centrifugal pump consists of an impeller, a pump body, a shaft, a bearing and a mechanical seal. Its dynamic sealing parts (such as mechanical seal rings) are prone to wear and corrosion, which can lead to leakage.

The annual maintenance cost of centrifugal pumps is 40% higher than that of magnetic pumps, mainly due to seal replacement and leak repair.

 

The difference between magnetic drive pumps and centrifugal pumps 3: performance parameters

 

The difference between magnetic drive pumps and centrifugal pumps

 

The difference between magnetic drive pumps and centrifugal pumps 4: industry applications

 

1. Application of magnetic pumps

The zero leakage advantage makes magnetic pumps an ideal choice for flammable, explosive, highly corrosive or toxic media:

Chemical industry: conveying sulfuric acid, hydrochloric acid, etc. (in accordance with ASME B73.3 standards).

Pharmaceutical industry: conveying high-purity fluids in a sterile environment to prevent contamination.

Nuclear energy: sealed conveying of radioactive media to ensure operator safety.

 

2. Application of centrifugal pumps

Centrifugal pumps excel in cost-sensitive and efficient applications:

Municipal water supply: high-flow, cost-effective clean water delivery.

Sewage treatment: handling sludge containing solid particles, wear-resistant.

Agricultural irrigation: conveying low-viscosity fluids over long distances in various environments.

 

The difference between magnetic drive pumps and centrifugal pumps

 

There are significant differences between magnetic drive pumps and centrifugal pumps, each with its own unique advantages. By gaining a deeper understanding of these differences, companies can achieve optimal safety and cost-effectiveness in chemical pump selection, thereby promoting sustainable operational practices.

The Difference between Angle Steel Telecom Tower and Self-Support Tower

2025-04-16
  • Angle steel telecom towers and self-support telecom towers are two common types of structures used in the telecommunications industry for supporting antennas, transmitters, and other equipment. Here are the key differences between angle steel telecom towers and self-support telecom towers:

  • Angle Steel Telecom Tower:
  • Design and Structure:

    • Angle steel telecom towers are typically lattice structures made of steel angles bolted or welded together to form a rigid framework.
    • They consist of vertical and horizontal members interconnected to create a stable support structure for antennas and telecom equipment.
    •  
  • Support Mechanism:

    • Angle steel towers rely on external support systems such as guy wires, which are anchored to the ground, to provide additional stability and prevent the tower from leaning or collapsing.
    • Guy wires are essential for angle steel towers to withstand wind loads and lateral forces.

    • angle steel telecom tower

  • Height and Load Capacity:

    • Angle steel towers can be designed to accommodate various heights and load capacities, depending on the specific requirements of the telecommunications equipment being mounted on the tower.
    • They are suitable for medium to tall structures and can support multiple antennas and transmitters.
    •  
  • Installation and Maintenance:

    • Angle steel towers are generally lighter and easier to transport and install compared to some other types of telecom towers.
    • Maintenance of angle steel towers typically involves inspections of the structure, guy wires, and equipment mounted on the tower.



  • Design and Structure:

    • Self-support telecom towers are standalone structures designed to be freestanding without the need for external guy wires or additional support mechanisms.
    • These towers are typically more robust and self-supporting, with a broader base and increased structural stability.
    •  
  • Load Distribution:

    • Self-support towers are designed to distribute the vertical and horizontal loads of the telecom equipment and antennas through the tower structure itself, without the reliance on guy wires.
    • The tower's design and foundation are crucial to ensuring stability and load-bearing capacity.

      self support telecom tower

  • Height and Configuration:

    • Self-support towers are commonly used for shorter to medium-height structures and are suitable for applications where space constraints or the absence of suitable anchoring points make guyed towers impractical.
    • They can support various types of antennas, transmitters, and equipment at different heights on the tower.
    •  
  • Installation and Maintenance:

    • The installation of self-support towers may require more complex foundation work to ensure the tower's stability and load-bearing capacity.
    • Maintenance of self-support towers involves regular inspections of the tower structure, foundation, and equipment mounted on the tower to ensure structural integrity.

  • In summary, angle steel telecom towers are lattice structures supported by guy wires, while self-support telecom towers are freestanding structures designed to support telecom equipment without the need for external support systems. The choice between these tower types depends on factors such as height requirements, load capacities, site conditions, and installation preferences in telecommunications infrastructure projects.


  • Learn more at www.alttower.com

     

    Contact Us

     

    telecom tower supplier

8 Level Weight Sorting Machine— The Whole Fresh Chicken Sorting

2025-04-15

 

8-Level weight sorting machine can be sorted according to the product weight size, continuously weigh and separate the product to the specified level, improve the standardization and qualified rate of products, suitable for sea cucumber, abalone, scallop and other products of multi-level sorting.

 

Working mode:First of all, the products to be weighed are placed on the conveyor belt, transported to the weighing area for weighing, and then transported to the selection by the conveying device. The system automatically, quickly and accurately sorts the products to the corresponding level exit according to the weighing results of the weighing platform compared with the input weight parameters, and completes the work of weighing and sorting. More automatic weighting packaging machine from https://www.uupac.com.

latest company news about Vermicelli conveying line & The whole Fresh chicken 8 level weight sorting machine  4

Working Video

UUPAC Pet Food Weighing and Packaging System

2025-04-15

Case:Supporting Platform + Vacuum Feeding Machine + Material Conveying Pipe +4 Head Linear Weigher + Storage Hopper + Bowl-Type Elevator+Packaging Machine + Finished Product Conveyor + Horizontal Finishing Conveyor + CW300 Check Weigher +Metal Detector

This automatic weighing and packaging system of pet food is designed for the integration of multiple equipment systems, which can realize the mixing of ten different feeds according to different proportions of formula and packaging according to different quantitative values, which can meet the quantitative feeding of pets of all ages in the market.

Multiple varieties, small batch has become normal market demand, traditional factories have been unable to meet. UUPAC intelligent can realize industry 4.0 intelligent packaging automatically, intelligently and efficiently.

automatic weighing and packaging system

Customers place orders through the mobile app → disassemble and arrange production in the control system → execute production in the factory line. Professional solution from order to delivery progress tracking. Customers can easily control the whole process of order (production) (and product data) without frequent worry about delivery time.

01 →According to the formula can choose 10 independent automatic feeding weighing system.

02 →Two independent bag-making systems can be selected according to the bag type, including real-time printing of product information.

03 →Self-adjusting weight inspection system according to product weight.

04 →Metal detection and elimination system.

05 →After receiving the order, the system automatically arranges the order production, real-time monitoring in the LAN, digital production and digital management, to make all production steps clear and smart.

The equipment is tailored for the weighing and packaging of pet food, and can be proportioned according to the nutritional needs of pets and automatically produce. It has a very humanized design, saving labor costs and improving production efficiency.

 

Case Video

What Is Multihead Weigher?

2025-04-15

A multihead weigher is a high-speed, automated weighing system used primarily in the food, pharmaceutical,

and packaging industries to accurately measure and portion products into predefined weights.

It consists of multiple independent weighing units (heads) that work together to achieve precise and efficient filling of packages or containers.  

Key Features of Multihead Weighers

1. High Speed & Accuracy

   - Capable of weighing up to 250–325 packs per minute (depending on model and product type) .  

   - Uses load cells for precise weight measurement, reducing product giveaway .  

 

2. Versatile Applications

   - Suitable for granular, powdery, sticky, or irregularly shaped products(e.g., snacks, meat, cheese, seafood, fruits, vegetables) .  

   - Used in industries like food processing, pharmaceuticals, agriculture, and recycling.  

 

3. Flexible Configurations

   - Available in 10, 13, or more weighing heads for different production needs .  

   - Can be combined with vibratory feeders, screw fillers, or linear weighers for optimal product handling .  

 

4. Smart Control & Automation

   - PLC or MCU-based control for stability and easy maintenance .  

   - IoT-enabled models allow real-time monitoring and data logging .  

 

5. Hygienic & Easy to Clean

   - Made with stainless steel  for food safety compliance .  

   - Wireless operator panels reduce contamination risks .  

 

Why Is The Multi-head Combination Weighing Scale So Accurate?

2025-04-15

Multihead Combination Weigher

Why Is The Multi-head Combination Weighing Scale So Accurate?

With the rapid development of modern industry, packaging industry in packaging accuracy, packaging speed, packaging range and other aspects also have higher requirements, traditional quantitative automatic packaging scale has been difficult to meet these requirements, and the multihead combination weigher is developed under this requirement, it and the traditional quantitative automatic packaging scale there are the following differences:

 1. The difference in weighing accuracy caused by different weighing principles

(1) The weighing principle is different

Quantitative automatic packaging scale is one side of the feeding side weighing, in the arrival of the target weight data before continuous feeding, when and the target weight difference a little must be added to the object, that is, after the coarse measurement and then fine measurement, such as the object is larger or heavier when there is a larger error, which affects the accuracy of the scale. The computer combined balance is composed of a number of weighing units with independent feed and discharge structure, the general computer combined balance is composed of 8 ~ 32 weighing units. The computer uses the principle of permutation and combination to automatically optimize the load of each weighing unit, and obtains the best and most close to the quantitative value of the combination for packaging. For example, a computer combination scale with ten weighing units will weigh each weighing unit and read the weight data of each weighing bucket into the computer. The computer will choose the optimal combination. According to combinatorial mathematics, ten weighing units can realize a total of 1023 combinations, and the computer will select the combination closest to the target weight value from the 1023 combinations. In this way, the above fine weighing is said to be large, and it is difficult to achieve quantitative value of the work. The computer combination scale takes the combination closest to the target weight as the final result.

(2) The reliability of test data varies

Because the traditional quantitative automatic packaging scale is feeding side weighing, so for the Wieser sensor is in the dynamic situation of weighing, if the object is affected or beat, will make the sensor induction of unstable weight data caused by error, and the vibration feed of the computer combination scale is carried out on the buffer hopper, weighing hopper is carried out in a stable situation, Therefore, the weight data obtained is of high accuracy.

(3) Drop error

This error for quantitative automatic packaging scale is a very significant error, weighing bucket weight value reached the set value, although the electromagnetic vibration feeder has stopped, but stop the moment, weighing bucket to vibrator a section of the existence of the called thing will eventually fall into the bucket produced the so-called drop error, although some quantitative automatic packaging scale use to shorten the feeding time to reduce the drop error, However, due to the flow rate, feed uniformity and other uncertain factors, there are still different degrees of error. The computer combined scale is fed from the buffer hopper to the weighing hopper, the weighing hopper is completely stable after issuing instructions for weighing, so there is no drop error.

2. The difference in weighing speed

The traditional quantitative automatic packaging scale generally needs to go through the weighing process of coarse measurement and fine measurement, especially the fine measuring process needs to be added bit by bit, which takes a long time and affects the weighing speed. For example, the weighing speed of the quantitative automatic packaging scale below 1 kg is generally in 20 ~ 30 packs/minute, and the high speed multihead weigher in the rapid optimization of the combined calculation of the computer generally 14 weighing units of the scale can reach 100 ~ 120 packs/minute, 4 ~ 6 times faster than the weighing speed of the quantitative automatic packaging scale, and easy to cooperate with a variety of packaging machines. Greatly improve the efficiency of packaging, more suitable for modern production management needs.

3. The difference in weighing range

Under the same accuracy, the weighing range of the computer combination scale is larger than that of the quantitative automatic packaging scale. In general, the weighing range of the quantitative automatic packaging scale is controlled within 4 times under the same accuracy, and the weighing range of the computer combination scale in the small weighing section can reach more than 10 times. It can also be seen from a large number of test results that there is a difference in weighing range between the two. For example, in the weighing range of ten grams to 1 kg, the computer combined scale can reach the accuracy level of X (1), especially in the small scale is rare. If you want to keep the accuracy level unchanged, quantitative automatic packaging scale only reduce the scale range, the formation of multi-stage scale, can only rely on the production of multiple series of products, in order to achieve a certain requirement of the manufacturer. The average manufacturer will hardly accept this phenomenon. This brings limitations to its practical application, which cannot meet the requirements of different packaging specifications (10-1000g) but similar precision in some production fields.

Your Accurate and Satisfied Controller-14 Head 5.0L Weigher

2025-04-15

First, don't starve to lose weight in summer. We all know that weight loss is actually a process of mutual game between calorie intake and output. Fruit and vegetable salad is the best weight loss "nutritious meal".They can fill your stomach without gaining weight. But do you know how salad greens are harvested from the field to your hands by using mechanization in one go? Now, please follow me and find it out.

Customers' requirements for packaging of fruits and vegetables are getting higher and higher. Their requirements are more inclined to multi-batch, small batch, short cycle, less contact, etc. Work efficiency and safety factor are highlighted. Major fresh fruit and vegetable manufacturers, retail supermarkets, and vegetable market distribution factories have made efforts to build their own fresh processing and distribution centers. Realizing Intelligent upgrade in product packaging, weighing and sorting.

Fruits and vegetables are of different sizes, heavy and light in weight, and also contain water. In the process of weighing and packaging, how to achieve accurate measurement while ensuring food quality.

 

Multihead Weigher Functions and Features

1. Adopt high-precision digital sensor, fast sampling speed and high precision;

2. Can be reset manually or automatically and dynamic zero tracking;

3. The latest optimized sampling algorithm to improve weighing accuracy;

4. Multiple feeding hopper discharges can effectively solve blockage;

5. Intelligent fault detection and error reporting; Accurate positioning to solve problems;

6. The combination of weighing and counting functions to improve counting accuracy;

 

Mechanical properties

1. Standard universal parts design and strong interchangeability;

2. It is used for 5-liter volume hopper, suitable for weighing conventional large-weight materials and has a wide range of applications;

3. The upper feed hopper and lower discharge hopper are easy to disassemble for easy cleaning;

4. The chassis "return" type structure design; The whole machine structure is stable and the appearance is harmonious and beautiful;

In addition to various intelligent weighing and packaging equipment, our company has more intelligent equipment in development and testing.

It is also the unshirkable responsibility of UUPAC to continue to empower traditional agricultural automation and facilitate the rapid development of agriculture!

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