Regarding the service life issues in the design drawings of pressure vessels and equipment
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1. Some equipment has a service life of 20 years, and some equipment has a service life of 10 years. What is the standard for defining the service life? 2. The service life of pressure vessel heat exchanger tube bundles is generally 3 years. What is the standard for defining the service life? 3. The pressure vessel heat exchanger tube bundle expires after 3 years of use. What standards or basis are used to determine whether to continue to use it?
I want to know too. Because I saw that some design documents do not have an age statement.
They are all given based on experience. If you write 20 years, it may actually last 15 years. If the control does not affect the operation of the equipment, there is no need to replace it or prepare it in advance.
According to the standards and combined with practical experience, the HG/T20580 standard also has recommended design years.
Design service life ≠ actual service life.
Also based on the corrosiveness of the medium, the designed service life is not equal to the actual service life. There are also some factors that will affect the service life during use.
It’s the wisest choice to replace it yourself when you’re old enough.
What is marked on the equipment design drawing is the expected design life, not the service life. Equipment design life refers to the expected service life of the equipment, which is the hope put forward by the design client. Generally, the design life of equipment is comprehensively determined from multiple aspects such as failure mode, equipment importance and economy, usage experience, and service life of complete sets of devices and systems. There is a difference between the design life of the equipment and the actual use time. The actual service life of the equipment should be determined based on the actual use conditions, inspection results and failure modes, and may be greater than the design life.: It is confirmed by inspection that it can continue to be used, but it may be lower than the design life.
This is mainly related to the corrosivity of the medium you design the product, the selected materials, and the corrosion margin. The main thing is to ensure that the equipment is safe within the design life.