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Mechanical seals are one of the basic mechanical components with precision and complex structure, and are the key components of various pumps, reaction synthesis kettles, turbo compressors, submersible motors and other equipment. Its sealing performance and service life depend on many factors, such as model selection, machine accuracy, correct installation and use, etc.

1. Selection method

Depending on the working conditions and the properties of the medium, mechanical seals include high-temperature and low-temperature-resistant mechanical seals, high-pressure and corrosion-resistant mechanical seals, particle-resistant mechanical seals, and mechanical seals adapted to easily vaporized light hydrocarbon media. The use of mechanical seals of different structural types and materials is selected.

The main parameters for selection are: sealed cavity pressure (MPA), fluid temperature (°C), working speed (M/S), fluid characteristics and effective space for sealing installation.

The basic principles of selection are:

1: According to the pressure of the sealing cavity, determine whether the sealing structure is balanced or unbalanced, single-end or double-end, etc.

2: According to the working speed, determine whether to use rotary or static, hydrodynamic or non-contact.

3: According to the temperature and fluid properties, determine the friction pair and auxiliary sealing materials, and correctly select the mechanical seal circulation protection system such as lubrication, flushing, heat preservation, cooling, etc.

4: According to the effective space of the installation seal, it is determined to use multiple springs or single springs or wave springs, built-in or external.

2. Installation and use requirements of mechanical seals

1: The requirements of the mechanical seal on the machine accuracy (take the mechanical seal for the pump as an example)

(1) The radial runout tolerance of the shaft (or shaft sleeve) where the mechanical seal is installed shall not exceed 0:04~0:06MM.

(2) The axial movement of the rotor does not exceed 0:3MM.

(3) The runout tolerance of the positioning end of the sealing cavity combined with the sealing end cover facing the surface of the shaft (or shaft sleeve) shall not exceed 0:04~0:06MM.

2: Confirmation of seals

(1) Confirm whether the installed seal is the same as the required model.

(2) Before installation, carefully check with the general assembly drawing to see if the number of parts is complete.

(3) For mechanical seals driven by parallel springs, the springs are divided into left and right rotations, which must be selected according to the rotation direction of the rotating shaft.

3: Installation

The installation method varies with the type of mechanical seal and the type of machine, but the installation essentials are almost the same. The installation steps and precautions are as follows:

(1) Determination of installation size

During installation, the installation size of the mechanical seal should be guaranteed according to the product instruction manual or sample.

(2) Before loading, the shaft (sleeve) and gland should be free of burrs, and the bearing should be in good condition; the seals, shaft, sealing cavity and gland should be cleaned. In order to reduce frictional resistance, the part where the mechanical seal is installed on the shaft should be coated with a thin layer of oil for lubrication. Considering the compatibility of rubber O-rings, if oil is not suitable, soapy water can be applied. The structure of floating static ring without anti-rotation pin should not be oiled, and should be installed in the gland dry.

(3) Install the static ring together with the gland on the shaft first, being careful not to collide with the shaft, and then install the moving ring assembly. The set screw of the spring seat or transmission seat should be evenly tightened several times.

Before the gland is not fixed, push the compensation ring by hand for axial compression. After loosening, the compensation ring can automatically spring back without jamming, and then the gland bolts are evenly locked.

4: use

(1) When the temperature of the conveying medium is too high, too low, or contains impurity particles, flammable, explosive or toxic, corresponding measures such as blocking, flushing, cooling, and filtration must be taken.

(2) Turn the car by hand before running, pay attention to whether the torque is too large, whether there is friction and abnormal sound.

(3) Pay attention to the direction of rotation, whether the coupling is centered, whether the addition of lubricating oil in the bearing part is appropriate, and whether the piping is correct.

(4) Before operation, first open the medium and cooling water valves, check whether the gas in the sealing chamber is fully discharged, and prevent leakage caused by static pressure, and then start the operation.

(5) Whether the work is normal and stable after driving, whether there is abnormal torque caused by shaft rotation, abnormal noise and overheating.

1. Introduction - Understanding the Importance of Sealing Solutions

2. Cartridge Seals Explained – Advantages and Applications

3. Component Seals - A Breakdown of their Features and Applications

4. Key Factors to Consider When Choosing between Cartridge Seals and Component Seals

5. Conclusion – Making the Right Decision for Your Specific Application

Introduction - Understanding the Importance of Sealing Solutions

When it comes to industrial applications such as pumps, compressors, and centrifuges, one crucial element that determines their efficiency and performance is the sealing solution used. The choice between cartridge seals and component seals plays a vital role in ensuring effective prevention of leaks, maintaining process efficiency, and maximizing equipment lifespan. In this article, we will dig deeper into the features, applications, and factors to consider when choosing between cartridge seals and component seals.

Cartridge Seals Explained – Advantages and Applications

Cartridge seals are pre-assembled, self-contained sealing units that consist of a rotating part, a stationary part, and a gland plate. These seals are factory-tested, ensuring precise alignment and superior performance. One of the significant advantages of cartridge seals is their ease of installation. With their pre-assembled nature, they eliminate the need for measurements, adjustments, and individual part installation, saving valuable time during equipment maintenance or repair.

Furthermore, cartridge seals offer enhanced reliability as they reduce the risk of human error during installation. They provide a standardized sealing solution that can be easily replaced, ensuring consistent performance across multiple applications. These seals are commonly used in pumps, mixers, agitators, and other rotating equipment in various industries such as oil and gas, chemical processing, and water treatment.

Component Seals - A Breakdown of their Features and Applications

Component seals, unlike cartridge seals, are made up of individual parts that need to be assembled at the installation site. They consist of a rotating part, a stationary part, and auxiliary components like springs and pins. Component seals offer a high level of customization, allowing engineers to tailor the sealing solution to specific equipment requirements. They are available in a wide range of materials, face combinations, and sizes, making them suitable for diverse industrial applications.

Component seals provide flexibility in addressing challenging sealing situations. They can be adapted for high temperatures, aggressive chemicals, abrasive media, and unique operating conditions. However, the assembly process can be complex, requiring skilled personnel, careful measurements, and appropriate tooling. Therefore, component seals are commonly preferred when dealing with customized equipment, non-standard applications, or specific sealing requirements.

Key Factors to Consider When Choosing between Cartridge Seals and Component Seals

1. Ease of Installation and Maintenance: If quick and hassle-free installation and maintenance are a priority, cartridge seals offer distinct advantages. Since they are pre-assembled, they significantly reduce downtime and the chances of errors during installation. Component seals, on the other hand, require meticulous assembly, making them suitable for situations where customization is crucial.

2. Cost-effectiveness: Cartridge seals may have a higher upfront cost due to their pre-assembled nature. However, their ease of installation and reduced downtime can offset this, making them more cost-effective in the long run. Component seals, while potentially cheaper initially, may lead to higher associated costs due to longer installation times and maintenance requirements.

3. Standardization vs. Customization: Cartridge seals provide standardized sealing solutions that can be easily replaced, offering consistent performance across multiple applications. Component seals, on the other hand, allow for customization, making them ideal for non-standard or unique equipment requirements.

4. Operating Environment and Conditions: The requirements of the operating environment, such as temperature, pressure, and media, play a crucial role in determining the suitable sealing solution. Cartridge seals generally offer reliable performance in a wide range of conditions, while component seals provide flexibility to withstand extreme or challenging operating conditions.

5. Personnel Skill Level: The complexity of the sealing solution and assembly process is an essential factor. Cartridge seals are designed for ease of use and can be installed by less skilled personnel. Component seals require a higher level of expertise, ensuring proper assembly and alignment for optimal performance.

Conclusion – Making the Right Decision for Your Specific Application

Choosing the right sealing solution between cartridge seals and component seals should be based on a careful evaluation of each application's unique requirements. While cartridge seals provide ease of installation, reliability, and standardization, component seals offer customization, flexibility, and adaptability. By considering factors such as installation/maintenance ease, cost-effectiveness, standardization vs. customization needs, operating conditions, and personnel skill level, engineers and maintenance professionals can make an informed decision to optimize the performance of their equipment and minimize the risk of leaks. Remember, the right sealing solution is crucial for smooth operation, increased efficiency, and prolonged equipment lifespan.