What are the precautions for the mechanical seal manufacturer maintenance?

2018 -
6 -

Mechanical seal are delicate and complex mechanical structure is one of the basic components, is all sorts of pumps, mechanical seals synthetic kettle, key components of the turbine compressor, submersible motors and other equipment.

The sealing performance and service life depends on many factors, such as selection, the precision of the machine, the correct installation use, etc.
Mechanical seal is made up of two pieces of sealing element (
Static ring and ring)

Perpendicular to the axis, bright and clean and mutual joint mechanical seal and flat surface, and the relative rotation of sealing device.

It depends on the pressure of sealing medium in rotary dynamic cyclization static ring contact surface (
End face)

On the proper compression force, make the two ends together, maintain between end face a very thin layer of liquid membrane and reach the purpose of sealing.

This layer of liquid membrane with fluid dynamic pressure and static pressure, lubrication and balance role.

1, 1) cleaning and examination of the mechanical seal

Check whether there is a dynamic and static ring surface defects such as scratch, crack, these flaws will cause serious leakage of mechanical seal.

Conditional can use a special tool to check the sealing face whether level off, sealing surface uneven, pressure water will enter the assembly of mechanical seal ring sealing surface activity, separate of dynamic and static ring, mechanical seal failure.

When necessary, can make tooling hydrostatic test before assembly.
2)

The working principle of mechanical seal for mechanical seal inside without any impurities.

Thoroughly cleaning before assembling mechanical seal ring and static ring, shaft sleeve, etc.
3)

See if there are any impact of dynamic and static ring seat sealing defects.

Such as dynamic and static ring seat with dynamic and static ring sealing ring surface is flawed.
4)

Check whether compensation spring mechanical seal damage and deformation, if stubborn coefficient change.
5)

Check the sealing sleeve defects such as the existence of burr, the trench.
6)

Have also check screw pump mechanical seal of pump body of the spiral line whether there is a crack, break the blemish such as.
7)

Cleaning the check all gasket exists defects such as cracks, porosity, measurement of synthetic diameter is within tolerance.
2, the size of the mechanical seal assembly technology check 1)
The size of the measurement of dynamic and static ring sealing surface.

This data is used to verify the radial width of dynamic and static ring, elected in different friction material, hard material friction surface radial width should be bigger than soft 1 ~ 3 mm, otherwise easy to face the hard stuff into soft material of end face edges and corners.
2)

Check of dynamic and static ring and the clearance between the shaft or the shaft sleeve, the inner diameter of the static ring 1-2 mm, usually larger than the diameter of axle for ring, in order to ensure floating, inner diameter larger than the diameter of axle 0.

5 ~ 1 mm, in order to compensate for shaft vibration and deflection, but the gap not too big, otherwise it will make the ring seal card into and cause the destruction of the mechanical seal function.
3)
Check of mechanical seal force.

We usually speak is mechanical seal force of end face specific pressure, face pressure to appropriate, too, will make the mechanical seal friction surface heating, accelerate the end wear, increase the friction power;
Is too small, easy to leak.

End face specific pressure is set at the mechanical seal design, when we are in the assembly can only be defined by measuring mechanical seal force.

Usually measurement method makes measurement installed static ring end face to the end of the capping vertical distance, then measuring ring end face to the end of the capping vertical distance, difference of the two is the mechanical seal of the force.
4)
Measure the length of the compensation spring is changing.

Change spring performance will directly affect the mechanical seal face pressure.

Usually spring in the long run length is shorten, the compensation spring on the ring of the mechanical seal will also, because of the centrifugal force and deformation.
5)

Measure the length of the static ring anti-rotating pin and pin hole depth, prevent the pin is too long the static ring cannot be assembled in place.
The problem will damage the mechanical seal.
3, 1) ring and static ring end face grinding

The ring to be removed, and the grinding, coarsely ground first, after lapping, conditional can be polished.
2)

When coarse grinding, choose # 80 ~ 160 of abrasive particle size, and trace to processing first.

Then available more than 160 # abrasive finishing grinding, make the finish to meet the design requirements.

Cemented carbides or ceramic ring need to use after fine grinding polishing machine polishing.

The magnitude of the polishing machine can choose M28 ~ M5 boron carbide.
After polishing mirror.

Ceramic ring M5 agate powder after fine grinding, are available with chromium oxide polishing.
3)

Static ring of graphite filled ptfe, due to the material is soft, available lapping with water or kerosene, gasoline, does not need to add abrasives.

But also the research in the running-in process, so the finish requirement is not too high.
4)

Grinding method, a grinding machine can be in the grinding machine grinding, no grinding machine can use the manual of the eight on flat glass grinding method.

4, axle housing inspection shaft sleeve after the overhauling of check the status of corrosion and wear, if the corrosion or wear more mild, usable fine sand paper polishing reoccupy, if serious corrosion or wear can adopt the method of processing after plating or change new bushing.
5, 1) spring

For mechanical seal with assembled box, box to be removed, and check whether groove wear or deformation, for correction, repair back slot or replacement.
2)

Mechanical seal after repair, to assembly, assembly after the same pressure experiment was carried out, and then put into normal operation.
3)

If you don't serious spring rusting, can keep the original elasticity, don't change.

If corrosion is more serious or elasticity decreased a lot, you need to change the new spring.

6, seal ring, after a period of time, loss of elasticity in most cases, or aging, usually need to change the new circle.

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Bellows is a sealing element that integrates elastic elements, auxiliary seals and torque transmission mechanisms (ordinary seals do not have this kinetic energy), and its torque mode is unique to bellows mechanical seals. In the application, due to the different requirements of each field, there are many types of it.

Bellows mechanical seals can be used in a wide range of applications, from low temperature to high temperature, from neutral media to corrosive media, from low speed to high speed, and from ordinary to harsh working conditions. Bellows include rubber bellows and serpentine sleeves, plastic bellows and metal bellows. Rubber bellows and serpentine sleeves are used for low-load mechanical seals as auxiliary seals; plastic bellows are used for mechanical seals in strong corrosive media as auxiliary seals; metal bellows are used for mechanical seals of high temperature, high pressure and low temperature media, which can be used as auxiliary seals. Can be used as elastic element.
Metal bellows should have greater elasticity, strength and stiffness. It can be used in occasions where the pressure reaches 7Mpa, suitable for high and low temperature operations, temperature resistance -240 ° C ~ +650 ° C, and film thickness is not greater than (

Marine equipment plays a crucial role in various industries, ranging from offshore drilling to shipping and water transportation. One key component that ensures the efficient functioning of these systems is the Grundfos Pump Seal. This article will emphasize the importance of Grundfos Pump Seals in marine equipment, shedding light on their design, functionality, and benefits. By understanding the significance of these seals, professionals and enthusiasts in the marine industry can appreciate how they contribute to the smooth operation of their equipment.



I. Introduction


Marine equipment, including pumps, plays a pivotal role in multiple maritime operations. These systems are exposed to demanding conditions such as temperature variations, corrosive fluids, and heavy-duty usage. To ensure the optimal functioning of marine equipment, manufacturers integrate advanced components like Grundfos Pump Seals.


II. Understanding Grundfos Pump Seals


A. What are Grundfos Pump Seals?


Grundfos Pump Seals are critical components that ensure the watertight integrity of pumps. They are designed to prevent leakage and maintain pressure differentials in various marine systems.


B. Design and Construction


Grundfos Pump Seals are engineered with precision to withstand the challenging marine environment. They consist of various parts, including stationary and rotating seal faces, elastomer bellows, and metal hardware like springs and sleeves.


C. Material Composition


These seals are typically composed of robust materials like carbon, ceramics, or silicon carbide, offering excellent resistance to corrosion, heat, and extensive wear.


D. Types of Grundfos Pump Seals


Grundfos offers a range of pump seals, including single seals and cartridge seals, to cater to diverse marine applications. They are designed to fit specific pump models and are known for their reliability and longevity.


III. Functionality of Grundfos Pump Seals


A. Ensuring Leak Prevention


Grundfos Pump Seals prevent fluid leakage by forming a secure seal between the pump shaft and the pump housing, preventing internal fluids from flowing out or external contaminants from entering the system.


B. Sealing Different Media


These seals are capable of sealing various media, including water, chemicals, oils, and other fluids, enabling their safe and efficient transportation within marine equipment.


C. Withstanding Harsh Marine Environment


Grundfos Pump Seals are designed to withstand the abrasive nature of seawater, extreme temperatures, and high-pressure conditions, ensuring consistent performance and reliability even in challenging marine environments.


D. Enhancing Energy Efficiency


The efficiency of marine equipment is crucial, especially when it comes to power consumption. Grundfos Pump Seals are engineered to minimize internal leakage, reducing energy losses and improving overall system efficiency.


IV. Benefits of Grundfos Pump Seals


A. Increased System Reliability


By preventing leaks and ensuring proper fluid sealing, these seals enhance the overall reliability of marine equipment. This reduces downtime, maintenance costs, and the risk of equipment failure during critical operations.


B. Improved Performance and Extended Equipment Lifespan


Grundfos Pump Seals contribute to the smooth operation of marine systems, reducing friction, and wear. By minimizing seal failures and premature equipment deterioration, they help extend the lifespan of pumps and related machinery.


C. Cost-Effective Solution


Investing in quality seals like Grundfos Pump Seals proves cost-effective in the long run. By reducing maintenance and replacement expenses, businesses can optimize their financial resources and improve their bottom line.


D. Reduced Maintenance Requirements


With their durability and resilience, Grundfos Pump Seals require minimal maintenance. This allows marine operators to focus on other essential tasks and reduces the need for frequent seal replacements or repairs.


E. Enhanced Safety Measures


The reliability and leak-preventing characteristics of these seals contribute to a safer working environment. By preventing potentially hazardous leaks, they protect personnel, equipment, and the marine ecosystem.


V. Applications of Grundfos Pump Seals in Marine Equipment


A. Offshore Oil and Gas Industry


Grundfos Pump Seals find extensive usage in offshore drilling platforms, subsea pumping systems, and pipelines, where they ensure the integrity of critical equipment involved in oil and gas extraction.


B. Marine Vessels and Water Transportation


From commercial ships to naval vessels, Grundfos Pump Seals are crucial for maintaining the efficiency and safety of onboard water circulation systems, hydraulics, and cooling systems.


C. Desalination Plants


Desalination plants rely on Grundfos Pump Seals to prevent saline water or corrosive chemicals from contaminating vital equipment, ensuring smooth and efficient water desalination processes.


D. Aquaculture and Fish Farming


In aquaculture setups, Grundfos Pump Seals play a vital role in circulating water, maintaining appropriate oxygen levels, and preventing contaminants from entering or escaping fish tanks or ponds.


VI. Maintenance and Troubleshooting Tips for Grundfos Pump Seals


A. Regular Inspection and Monitoring


Routine inspection and monitoring of pump seals can help identify early signs of wear or damage, allowing proactive maintenance and prevention of potential failures.


B. Proper Lubrication Practices


Using suitable lubricants and following the manufacturer's recommendations for lubrication intervals can significantly extend the life of Grundfos Pump Seals and ensure their optimal performance.


C. Handling Seal Failures and Leakages


In case of seal failures or leakages, immediate action should be taken to prevent further damage. Identifying the root cause, replacing faulty seals, and addressing other related issues are essential for minimizing downtime.


D. Replacing Worn-Out Seals


Regularly replacing worn-out seals before they fail completely helps prevent costly repairs and ensures optimal functionality of marine equipment.


VII. Conclusion


In the marine industry, Grundfos Pump Seals are indispensable components that provide reliable sealing solutions for pumps and associated equipment. Their role in preventing leaks, maintaining system efficiency, and enhancing equipment lifespan cannot be understated. By understanding the importance of Grundfos Pump Seals, professionals in the marine sector can ensure smooth operations, reduce maintenance costs, and enhance overall safety and productivity.