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AS-C481 cartridge seal is customized single seal with single spring that made as per client drawing.
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Background :
The life assessment of mechanical seals involves multiple aspects. The following provides a detailed introduction to the current relevant standards and influencing factors:
standard specification
Domestic standards
JB/T4127.1-2013"Technical Conditions for Mechanical Seals": Under reasonable selection and correct installation and use, when the sealed medium is water, oil, or similar media, the service life of mechanical seals is generally not less than 1 year.
GB/T 14211-2019"Test Methods for Mechanical Seals": specifies the test classification, factory test, type test, test report, test apparatus, and instruments for performance testing of mechanical seal products. It can be used to test the performance and service life of mechanical seals under operating conditions and is applicable to mechanical seals of centrifugal pumps and similar rotating machinery.
Foreign standards
Japanese JISB2405-77"General Specification for Mechanical Seals": Generally, the minimum service life requirement for general mechanical seals is 1 year, but this limit is not applicable under harsh conditions, high operating rates, and frequent startups.
API682-2014"Shaft Seal System for Centrifugal and Rotary Pumps": It is stipulated that the mechanical seal should operate continuously for 25000 hours without replacement; The sealing system for centrifugal pumps and rotary pumps specifies a sealing service life of 3 years and 14 years.
Evaluation suggestions in practical applications
Establish expectations
Helping users establish appropriate lifespan and expected results is also the foundation of integrity and long-term cooperation. Under normal circumstances, the overall lifespan of a machine seal can be expected (such as one year). If it has exceeded its service life, even if there is no leakage, it is still recommended to replace or inspect and repair the machine seal during equipment maintenance. And the particularity of the operating conditions is likely to reduce the expected lifespan of the seal or increase the cost of downtime due to malfunctions.
Testing parameter evaluation
When conducting reliability testing on mechanical seals, there are some technical parameters that can be used to evaluate their lifespan and performance stability:
Failure Rate: The unit of measurement is the number of failures per unit time, reflecting the frequency of system failures during operation.
Mean Time Between Failures (MTBF): Refers to the average operating time between each failure, usually measured in hours.
Mean Time to Repair (MTTR): refers to the average time required to repair a fault, measured in hours. In addition, Weibull analysis can be used to evaluate fault data and estimate the reliability and lifespan of the product.
Factors affecting lifespan
The actual lifespan of mechanical seals is influenced by various factors, which also need to be considered when evaluating their lifespan.
condition
The operating conditions such as pressure, speed, temperature, medium particle concentration, corrosiveness, etc. have a significant impact on the service life of mechanical seals. Most seals have a service life of at least two years when operated under their extreme operating conditions, such as pressure, speed, or temperature; But cyclic operations may make these published lifespan limits unreliable.
Seal Design
Different sealing structure forms, such as single end face and double end face, bulk and container type, spring type and bellows type, as well as design factors such as the material of the sealing friction pair, can all affect the service life of mechanical seals.
Maintenance Practices
Proper selection, installation, and maintenance of seals can help extend their service life and improve pump reliability. For example, spare mechanical seals or spare parts packages are necessary, and normal ordering should be done in advance to avoid hasty ordering, repairs, and even affecting normal production. At the same time, it is not recommended to store mechanical seals for too long. If they are stored for more than a year, it is recommended to check if the components are functioning properly and conduct a trial run before use.
standard specification
Domestic standards
JB/T4127.1-2013"Technical Conditions for Mechanical Seals": Under reasonable selection and correct installation and use, when the sealed medium is water, oil, or similar media, the service life of mechanical seals is generally not less than 1 year.
GB/T 14211-2019"Test Methods for Mechanical Seals": specifies the test classification, factory test, type test, test report, test apparatus, and instruments for performance testing of mechanical seal products. It can be used to test the performance and service life of mechanical seals under operating conditions and is applicable to mechanical seals of centrifugal pumps and similar rotating machinery.
Foreign standards
Japanese JISB2405-77"General Specification for Mechanical Seals": Generally, the minimum service life requirement for general mechanical seals is 1 year, but this limit is not applicable under harsh conditions, high operating rates, and frequent startups.
API682-2014"Shaft Seal System for Centrifugal and Rotary Pumps": It is stipulated that the mechanical seal should operate continuously for 25000 hours without replacement; The sealing system for centrifugal pumps and rotary pumps specifies a sealing service life of 3 years and 14 years.
Evaluation suggestions in practical applications
Establish expectations
Helping users establish appropriate lifespan and expected results is also the foundation of integrity and long-term cooperation. Under normal circumstances, the overall lifespan of a machine seal can be expected (such as one year). If it has exceeded its service life, even if there is no leakage, it is still recommended to replace or inspect and repair the machine seal during equipment maintenance. And the particularity of the operating conditions is likely to reduce the expected lifespan of the seal or increase the cost of downtime due to malfunctions.
Testing parameter evaluation
When conducting reliability testing on mechanical seals, there are some technical parameters that can be used to evaluate their lifespan and performance stability:
Failure Rate: The unit of measurement is the number of failures per unit time, reflecting the frequency of system failures during operation.
Mean Time Between Failures (MTBF): Refers to the average operating time between each failure, usually measured in hours.
Mean Time to Repair (MTTR): refers to the average time required to repair a fault, measured in hours. In addition, Weibull analysis can be used to evaluate fault data and estimate the reliability and lifespan of the product.
Factors affecting lifespan
The actual lifespan of mechanical seals is influenced by various factors, which also need to be considered when evaluating their lifespan.
condition
The operating conditions such as pressure, speed, temperature, medium particle concentration, corrosiveness, etc. have a significant impact on the service life of mechanical seals. Most seals have a service life of at least two years when operated under their extreme operating conditions, such as pressure, speed, or temperature; But cyclic operations may make these published lifespan limits unreliable.
Seal Design
Different sealing structure forms, such as single end face and double end face, bulk and container type, spring type and bellows type, as well as design factors such as the material of the sealing friction pair, can all affect the service life of mechanical seals.
Maintenance Practices
Proper selection, installation, and maintenance of seals can help extend their service life and improve pump reliability. For example, spare mechanical seals or spare parts packages are necessary, and normal ordering should be done in advance to avoid hasty ordering, repairs, and even affecting normal production. At the same time, it is not recommended to store mechanical seals for too long. If they are stored for more than a year, it is recommended to check if the components are functioning properly and conduct a trial run before use.
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