Centrifugal Compressor Seal Gas System: Things You May Want to Know

Mechanical seal device and application requirements Mechanical seal is a high-precision mechanical equipment component. Its performance and service life are greatly related to the operating conditions, accuracy and sealing device of the host. Therefore, it is necessary to follow The following requirements should be carried out: 1. Precautions before installation 1. Correctly select the appropriate type of mechanical seal and data combination according to the working conditions and host conditions; 2. When the pump or other similar rotating machinery equipped with mechanical seal is in operation, the rotor is axially String momentum≤0.3mm 3. The step of the shaft (or sleeve) of the mechanical seal of the device must have a chamfer of 3×10°, and smooth transition, and its roughness Ra≤1.6. 4. The surface roughness of the shaft (or sleeve) of the mechanical seal part of the device is Ra≤1.6, the runout service is ≤0.04mm, and the standard service is h6. 5. The surface roughness Ra ≤ 1.6 of the sealing end cover and the auxiliary sealing ring of the mechanical seal static ring of the device, the standard service is H8, and the straightness of the positioning end facing the shaft ≤ 0.04mm. 6. For mechanical seals, it is necessary to clean the shaft (or shaft sleeve) seal cavity, seal end cover and mechanical seal itself to prevent any impurities from entering the seal part. 7. When the device stops the ring, especially the carbon graphite ring, it is necessary to be extra careful to press in. 8. When the temperature of the conveying medium is too high, too low, or contains impurity particles, flammable, explosive, toxic, etc., adopt corresponding blocking, flushing, cooling, and filtering methods according to API682 specifications. 9. According to the device operation manual or sample, ensure the device size of the mechanical seal. 10. For mechanical seals driven by tension springs, the rotation direction of the tension spring should be selected reasonably. Generally, from the motor end to the impeller end, when the shaft is clockwise, the right-handed tension spring should be selected, otherwise, the left-handed tension spring should be selected. 11. When the double-end mechanical seal is in operation, the pressure of the barrier fluid is 0.05-0.2MPa higher than the pressure of the medium in the sealed cavity. 2. Installation notes 1. The installation process should be carried out in a boring, dust-free and clean working environment, and the parts of the sealed cavity and seals should be clean and clean. 2. In order to reduce the conflict resistance, when installing, apply a layer of clean smooth oil or grease to the surface of the auxiliary seal. However, it is necessary to pay attention to when using ethylene-propylene rubber as auxiliary seals, do not touch with mineral oil or grease, and can be cleaned and smoothed with water or soapy water; 4. The operating height of the spring must reach the product sample or device drawing. Indicates the height of the device. 5. It is forbidden to knock or hit the seal during the installation process; when the sealing device is over, it is not allowed to hit or hit the shaft, shaft sleeve, sealing end cover, etc., so as to avoid damage to the mechanical seal and cause the seal to fail. 3. Matters needing attention when the sealing device is over and the equipment is turned on 1. It is necessary to exhaust the air in the sealed chamber, especially the double end seal with sealing liquid, and pay attention to exhaust air. When driving from the beginning, the suction valve should be opened first, and the motor should be turned on after the liquid (medium) enters the sealed cavity. For those media with crystallization, when starting from the beginning, the crystals on the sealing surface, tension spring and other related structural parts should be washed clean with lotion before driving. 2. Before starting the equipment, check that the resistance of the shaft is normal and even, and no jamming is allowed. 3. Before the equipment works, the sealed cavity must be filled with medium, adhere to excellent smoothness, and prohibit dry conflicts, which will cause the seal to fail. Keywords: mechanical seal

The environment of the reactor shaft seal device The following discusses the characteristics of different types of reactors and the issues to be considered in the design of mechanical seals. 1. Side-entry reactor with stirring shaft. From the lubrication point of view, this type of mechanical seal for reaction axe generally does not have the problem of poor lubrication of the mechanical seal for the kettle, but the liquid level of the medium in the kettle must be maintained at a certain level. From a mechanical and technological point of view, the design of this kettle has many shortcomings. In the reactor with the shaft extending from one side, the shaft is in a cantilever state, so it is prone to vibration, and the mechanical seal is more sensitive to vibration. If the shaft extends from both sides, the shaft must be centered with the support device of the mechanical seal on the kettle body, and it is difficult to meet this requirement, so the balance between the shaft and the kettle is very complicated. In the case of large changes in the operating temperature, the shaft has a large expansion and contraction. If the excessive expansion and contraction are all borne by the mechanical seal, the mechanical seal is likely to fail. However, the speed of this type of kettle is not high, as long as the corresponding measures are taken, this problem can be solved. 2. Insert the reactor at the bottom of the stirring shaft. The polymerization reactor has gradually developed in the direction of large volume, and its stirring shaft has also changed from the top-insertion type to the bottom-insertion type. The characteristic of the bottom plug-in reactor is that the stirring shaft is short and the bending stress on the shaft is small, so the calculation shaft diameter is small, which saves labor and materials. The rigidity of the short shaft and the long shaft is good, and the deformation is small. But the seal is at the bottom of the kettle. Although it can ensure the lubrication of the seal, the solid impurities are easy to deposit around the seal, causing abrasive wear on the end face of the friction pair, and it is easy to cause the moving parts to block and scale. In this case, the mechanical seal is always under the pressure of the liquid. When the seal needs to be repaired or replaced, the material in the kettle must be emptied. When the material is a high-viscosity polymer, it is more difficult to completely empty it. For this reason, it is necessary to carry out a special design of the mechanical seal and adopt special measures at the same time, in order to expect the rice noodles to have good working performance and easy maintenance. 3. Insert the reactor at the top of the stirring shaft. The top plug-in agitated shaft reactor is widely used, and the problems encountered in its sealing are different from the previous ones. Because the seal is placed in the upper part of the kettle, it is in the gas phase space (the liquid is only when the material is full of the kettle), in order to avoid dry friction of the seal, a certain lubricating cooling method is required. The top-inserted and vertically installed mixing shaft has a large aspect ratio and may have low processing and installation accuracy, so it will inevitably produce greater deflection. During movement, the following factors will aggravate the vibration of the stirring shaft. 1) Uneven mixing blades 2) The liquid level is too low or there is vortex. 3) The feed is uneven, or the reaction is not well controlled. 4) Pressure and temperature fluctuations. 5) The pressure and temperature changes cause the deformation of the stirring shaft and the kettle body. 6) The speed of the stirrer changes suddenly, or the temperature drops to increase the viscosity of the polymer. The top-inserted reactor has a large length-to-diameter ratio of the stirring shaft, and an intermediate bearing is usually provided to provide a relatively vibration-free working environment for the seal and make the seal run smoothly. The general requirement for the structure of the mechanical seal is easy and simple to load and unload. The reaction kettle is a large-scale equipment. It is necessary to install the mechanical seal parts on the kettle one by one. It is difficult to ensure its accuracy. Many of the failures of the mechanical seal of the kettle are caused by poor installation. The so-called simplified structure for loading and unloading, specifically, is to design the mechanical seal into a flange as a combination assembly, and after commissioning in the workshop, it is installed on the kettle together during installation without adjustment; thus, installation errors can be avoided; Remove it when disassembling, repair and replacement of the old assembly can be carried out in the repair shop. In this way, the installation and maintenance process of the seal is greatly accelerated, thereby greatly reducing the downtime loss in production.

Understanding the Different Types of Fristam Pump Seals Available

Fristam pumps are a reliable and trusted brand in the industry. They are known for their reliability, durability, and versatility. As they are used in a wide range of industries, such as food processing, pharmaceuticals, and wastewater treatment, it is important to have a good understanding of the different types of Fristam pump seals available. This article aims to provide an overview of the different seals available for Fristam pumps, along with their key features and benefits.

Subheading 1: Introduction to Fristam Pump Seals

Before delving into the different seals available, it is important to understand the role of the seal in a Fristam pump. A pump seal prevents fluid from leaking between the rotating shaft and the stationary pump housing. The seal is a critical component of the pump, as even a small leak can result in significant problems, such as contamination of the product, reduced efficiency, and increased downtime. Therefore, selecting the appropriate seal for the application is crucial to ensure optimal performance and reliability of the pump.

Subheading 2: Lip Seal

One of the most common seals used in Fristam pumps is the lip seal. A lip seal is a simple, relatively inexpensive seal that consists of a sealing lip, which contacts the shaft, and a static portion, which is mounted to the housing. The lip seal is effective at preventing fluid leakage, and it can handle a wide range of temperatures and pressures. However, lip seals have limited durability and may require frequent replacement.

Subheading 3: Single Mechanical Seal

A single mechanical seal is a type of seal that uses a rotating seal face that contacts a stationary seal face to create a seal between the rotating shaft and the pump housing. The seal faces are held together by a spring, which maintains pressure and enables the seal to adjust to changes in temperature and pressure. Single mechanical seals are available in a range of configurations, including balanced, unbalanced, and dry running. They are reliable and durable, and can handle a wide range of operating conditions. However, single mechanical seals are generally more expensive than lip seals and require more maintenance.

Subheading 4: Double Mechanical Seal

A double mechanical seal is similar to a single mechanical seal, but it has two sets of seal faces, which provide an extra layer of protection against fluid leakage. The two sets of seal faces are separated by a barrier fluid, which acts as a lubricant and cooling agent. Double mechanical seals are ideal for applications that require high levels of safety and reliability, such as chemical processing and petroleum refining. They are more expensive than single mechanical seals, but they offer superior performance and reduced downtime.

Subheading 5: O-Ring Seal

An O-ring seal is a simple, cost-effective seal that consists of a rubber ring that fits around the shaft and contacts the housing. O-ring seals are effective at preventing fluid leakage and are suitable for low-pressure applications. They are easy to install and require minimal maintenance. However, O-ring seals have limited durability and may not be suitable for high-temperature or high-pressure applications.

Subheading 6: Conclusion

In conclusion, selecting the appropriate seal for your Fristam pump is crucial to ensure optimal performance, reliability, and safety. The different seals available offer varying levels of durability, reliability, and performance, depending on the specific application. The lip seal is a simple and inexpensive option that is suitable for low-pressure applications, whereas the single and double mechanical seals offer superior performance and reliability for more demanding applications. Finally, O-ring seals provide a cost-effective solution for low-pressure applications but may not be suitable for high-pressure or high-temperature applications. Understanding the different types of Fristam pump seals available is key to selecting the best option for your application, thereby ensuring safe, reliable, and efficient operation of your pump.

Single Cartridge Mechanical Seals in Hydrogen Compression: Meeting Green Demands

Introduction

Hydrogen is gaining significant attention as a clean and sustainable energy source. As industries transition towards greener practices, the importance of efficient hydrogen compression systems becomes crucial. Single cartridge mechanical seals provide a reliable solution for sealing applications in hydrogen compression processes. In this article, we will explore the benefits and applications of single cartridge seals in hydrogen compression, highlighting their role in meeting the growing green demands.

Understanding Hydrogen Compression

Hydrogen compression is an essential step in the production, storage, and transportation of hydrogen. It involves increasing the pressure of hydrogen gas, enabling efficient storage and distribution. Compression ensures that hydrogen can be transported safely while maximizing its density for optimal energy storage. It is important to maintain leak-free systems to prevent safety hazards and minimize energy losses.

The Role of Mechanical Seals in Hydrogen Compression

Mechanical seals play a critical role in maintaining the integrity of hydrogen compression systems. They are used to seal the clearance between the rotating and stationary components in pumps, compressors, and other equipment. In hydrogen compression, where safety and efficiency are paramount, the selection of appropriate sealing solutions is crucial.

Benefits of Single Cartridge Mechanical Seals

1. Enhanced Safety: Single cartridge mechanical seals provide a contained and reliable sealing solution. They are designed with advanced features such as double-acting elastomer energization, ensuring leak-proof performance even under high pressure and temperature conditions. These seals minimize the risk of hydrogen leakage, reducing the potential for accidents or environmental hazards.

2. Simplified Installation: Single cartridge seals are pre-assembled and factory-tested, eliminating the need for intricate on-site assembly. Their compact design reduces installation time and ensures accurate installation without the need for specialized tools. As a result, downtime is minimized, and hydrogen compression systems can be quickly commissioned, resulting in increased productivity.

3. Operational Versatility: Single cartridge mechanical seals are designed to handle a wide range of process parameters and operating conditions. They exhibit robust performance in both high and low-pressure applications while maintaining excellent reliability and durability. With their versatile design, these seals can be utilized in various types of hydrogen compression systems.

4. Reduced Environmental Impact: The environmentally friendly nature of hydrogen as an energy source aligns well with the green demands of modern industries. Single cartridge mechanical seals contribute to sustainability efforts by minimizing leakages and reducing energy consumption. Their enhanced reliability ensures minimal maintenance and extended service life, reducing waste generation and maximizing resource efficiency.

Applications of Single Cartridge Mechanical Seals in Hydrogen Compression

1. Hydrogen Refueling Stations: Single cartridge seals find extensive use in hydrogen refueling stations, where high-pressure pumps are employed to ensure efficient fueling operations. These seals enable safe and reliable operation, preventing any potential hydrogen leaks during the refueling process.

2. Electrolysis Systems: Electrolysis systems utilize energy to split water molecules into hydrogen and oxygen. Mechanical seals are vital in the compression of generated hydrogen before storage or transportation. Single cartridge seals ensure the sealing integrity of the system, allowing for efficient utilization of electricity and maximum hydrogen generation.

3. Industrial Applications: Single cartridge mechanical seals play a crucial role in various industrial applications, such as hydrogen compression for chemical processes, power generation, and metal refining. These seals maintain the required pressure, ensuring efficient and reliable operations, thus meeting the green demands of the industry.

4. Transportation: Single cartridge seals are employed in compressors used for designing hydrogen transportation systems. They ensure leak-free operation during the compression and storage of hydrogen gas in high-pressure tanks, enabling safe and sustainable transportation of hydrogen to its end-users.

Conclusion

As industries strive to meet green demands, the importance of efficient and reliable hydrogen compression systems cannot be overstated. Single cartridge mechanical seals prove to be a valuable solution in sealing applications associated with hydrogen compression. With their enhanced safety features, simplified installation processes, and reduced environmental impact, these seals contribute to the sustainable transition towards a greener future. Their versatility and applicability across various hydrogen compression processes make them an ideal choice for meeting the evolving demand for clean energy.