Self-priming Fluorine Lined Magnetic Pump

In industries such as chemicals, pharmaceuticals, and new materials, the tank farm area serves as a critical transfer point connecting raw material supply with workshop processes. Especially for long-distance liquid transfer from storage tanks to workshops, ensuring safety, sealing performance, and stable conveying becomes the core of equipment selection. Magnetic pumps, with their leak-free and explosion-proof structure, have become the preferred solution for transferring raw materials and finished products in tank farm systems. 1. Transfer Scenario: Challenges from the “Tank Area” to the Workshop A “tank area” refers to the zone for raw material unloading, product loading, and intermediate material storage. In actual operations, liquids are transferred from tank trucks into storage tanks, typically within a distance of around 20 meters. Next, the material must be conveyed stably through pipelines to workshops located more than 50 meters away. This type of transfer scenario has three typical characteristics: A. Long distance and high head requirements: Pipeline lengths often exceed 50 meters; head must account for pipeline resistance and elevation differences. B. Media are usually volatile or toxic: Such as alcohols, ketones, and organic solvents—requiring excellent system sealing. C. High explosion-proof requirements and limited maintenance access: Usually located in hazardous areas, demanding reliable, low-maintenance equipment. 2. Why Magnetic Pumps Are Suitable for Tank Area Transfer Shengshi Datang magnetic pumps use magnetic coupling drive and require no mechanical seals, eliminating leakage risks structurally. For toxic, flammable, or volatile media, magnetic pumps offer true zero-leakage performance. Through optimized flow channels and efficient magnetic drive systems, Shengshi Datang magnetic pumps ensure stable output even during long-distance transfer, making them especially suitable for high-frequency transfers from tank farms to workshops. 3. Key Points for Pump Selection A. Head Matching: For pipelines exceeding 50 meters, account for frictional and local resistance, as well as tank liquid level and workshop elevation. It is recommended to design the pump head at 1.2× the actual requirement as a safety margin. B. Material Selection: Wetted parts should be selected according to the medium’s corrosiveness—stainless steel, fluoroplastic lining, or other corrosion-resistant materials. C. Flow Rate Determination: Select based on unloading or process requirements, generally using the maximum required flow to avoid insufficient feeding or frequent start–stop cycles. D. Motor Configuration: Use explosion-proof motors, with a grade not lower than EX d IIB T4, matching the operating conditions to ensure long-term safe operation. E. Cooling Structure: For easily vaporized liquids, choose magnetic pumps with auxiliary cooling circuits to prevent demagnetization of the inner magnet or local cavitation in the pump chamber. 4. Reference Case At a fine chemical plant in East China, ethanol is transferred from the tank area to a workshop around 55 meters away. Initially, mechanical-seal centrifugal pumps were used, but frequent leakage and long maintenance cycles caused issues. They were later replaced with fluoroplastic-lined magnetic pumps equipped with explosion-proof motors and auxiliary cooling loops. After three years of operation, no leakage occurred, and maintenance costs dropped by more than 40%. Long-distance transfer from tank areas to workshops demands high levels of stability and sealing from pumps. Magnetic pumps, with their sealless design and strong corrosion resistance, demonstrate significant advantages in such systems. During selection, factors such as transfer distance, medium characteristics, and site explosion-proof requirements should be thoroughly evaluated. Choosing products from manufacturers with extensive industry experience ensures long-term stable operation. Shengshi Datang Pump Industry’s magnetic pumps have been widely used in such applications and are a reliable choice.

Magnetic pumps are commonly used pumps, and demagnetization is a relatively frequent cause of damage. Once demagnetization occurs, many people may find themselves at a loss, which could lead to significant losses in work and production. To prevent such situations, Anhui Shengshi Datang will briefly explain today why magnetic pumps experience demagnetization.   1. Magnetic Pump Structure and Principle 1.1 Overall Structure The main components of a magnetic pump's overall structure include the pump, the motor, and the magnetic coupler. Among these, the magnetic coupler is the key component, encompassing parts such as the containment shell (isolating can) and the inner and outer magnetic rotors. It significantly impacts the stability and reliability of the magnetic pump.   1.2 Working Principle A magnetic pump, also known as a magnetically driven pump, operates primarily on the principle of modern magnetism, utilizing the attraction of magnets to ferrous materials or the magnetic force effects within magnetic cores. It integrates three technologies: manufacturing, materials, and transmission. When the motor is connected to the outer magnetic rotor and the coupling, the inner magnetic rotor is connected to the impeller, forming a sealed containment shell between the inner and outer rotors. This containment shell is firmly fixed to the pump cover, completely separating the inner and outer magnetic rotors, allowing the conveyed medium to be transmitted into the pump in a sealed manner without leakage. When the magnetic pump starts, the electric motor drives the outer magnetic rotor to rotate. This creates attraction and repulsion between the inner and outer magnetic rotors, driving the inner rotor to rotate along with the outer rotor, which in turn rotates the pump shaft, accomplishing the task of conveying the medium. Magnetic pumps not only completely solve the leakage problems associated with traditional pumps but also reduce the probability of accidents caused by the leakage of toxic, hazardous, flammable, or explosive media.   1.3 Characteristics of Magnetic Pumps (1) The installation and disassembly processes are very simple. Components can be replaced anywhere at any time, and significant costs and manpower are not required for repair and maintenance. This effectively reduces the workload for relevant personnel and substantially lowers application costs. (2) They adhere to strict standards in terms of materials and design, while requirements for technical processes in other aspects are relatively low. (3) They provide overload protection during the conveyance of media. (4) Since the drive shaft does not need to penetrate the pump casing, and the inner magnetic rotor is driven solely by the magnetic field, a completely sealed flow path is truly achieved. (5) For containment shells made of non-metallic materials, the actual thickness is generally below about 8 mm. For metallic containment shells, the actual thickness is below about 5 mm. However, due to the thick inner wall, they will not be punctured or worn through during the operation of the magnetic pump.   2. Main Causes of Demagnetization in Magnetic Pumps 2.1 Operational Process Issues Magnetic pumps represent relatively new technology and equipment, requiring high technical proficiency during application. After demagnetization occurs, operational and process aspects should first be investigated to rule out problems in these areas. The investigation content includes six parts: (1) Check the magnetic pump's inlet and outlet pipelines to ensure there are no issues with the process flow. (2) Check the filter device to ensure it is free of any debris. (3) Perform priming and venting of the magnetic pump to ensure no excess air remains inside. (4) Check the liquid level in the auxiliary feed tank to ensure it is within the normal range. (5) Check the operator's actions to ensure no errors occurred during operation. (6) Check the maintenance personnel's operations to ensure they complied with relevant standards during maintenance.   2.2 Design and Structural Issues After thoroughly investigating the above six aspects, a comprehensive analysis of the magnetic pump's structure is necessary. The sliding bearings play a cooling role when the magnetic pump conveys the medium. Therefore, it is essential to ensure sufficient medium flow rate to effectively cool and lubricate the gap between the containment shell and the sliding bearings, and the friction between the thrust ring and the shaft. If there is only one return hole for the sliding bearings and the pump shaft is not interconnected with the return hole, the cooling and lubrication effect can be reduced. This prevents complete heat removal and hinders maintaining a good state of liquid friction. Ultimately, this can lead to seizure of the sliding bearings (bearing lock-up). During this process, the outer magnetic rotor continues to generate heat. If the inner magnetic rotor's temperature remains within the limit, the transmission efficiency decreases but can potentially be improved. However, if the temperature exceeds the limit, it cannot be remedied. Even if it cools down after shutdown, the reduced transmission efficiency cannot recover to its original state, eventually causing the magnetic properties of the inner rotor to gradually diminish, leading to demagnetization of the magnetic pump.   2.3 Medium Properties Issues If the medium conveyed by the magnetic pump is volatile, it can vaporize when the internal temperature rises. However, both the inner magnetic rotor and the containment shell generate high temperatures during operation. The area between them also generates heat due to being in a vortex state, causing the internal temperature of the magnetic pump to rise sharply. If there are issues with the magnetic pump's structural design, affecting the cooling effect, then when the medium is delivered into the pump, it may vaporize due to the high temperature. This causes the medium to gradually turn into gas, severely affecting the pump's operation. Additionally, if the static pressure of the conveyed medium within the magnetic pump is too low, the vaporization temperature decreases, inducing cavitation. This can halt the medium conveyance, ultimately causing the magnetic pump bearings to burn out or seize due to dry friction. Although the pressure at the impeller varies during operation, centrifugal force effects can cause very low static pressure at the pump inlet. When the static pressure falls below the vapor pressure of the medium, cavitation occurs. When the magnetic pump contacts the cavitating medium, if the cavitation scale is small, it might not significantly affect the pump's operation or performance noticeably. However, if the medium's cavitation expands to a certain scale, a large number of vapor bubbles form inside the pump, potentially blocking the entire flow path. This stops the flow of medium inside the pump, leading to dry friction conditions due to the ceased flow. If the pump's structural design results in an inadequate cooling effect, the containment shell temperature can become excessively high and cause damage, subsequently increasing the temperature of both the medium and the inner magnetic rotor.