Is it acceptable to use a design lifespan of 20 years for general pressure vessels?
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Is it acceptable to use a design life of 20 years for general pressure vessels? What needs to be considered. Normally, corrosion margin is not considered over a period of 10 years; for material 304, what needs to be taken into account after 20 years?
It is okay to use 20 years. The corrosion margin ÷ corrosion rate must be ≥ 20.
Although the specifications require specifying the design service life of the equipment, it is merely a number; generally, the design service life for ordinary equipment is 10 years, while it is longer for critical equipment. For the specific duration, refer to HG/T20580-2011.
This mainly depends on the owner’s requirements; the service life of the equipment is considered in conjunction with its overall investment and the lifespan of the production facilities.
I’m not sure about the specific corrosion rate; generally, for herbal solutions, a sample is taken every 10 years, but how often should a sample be taken after 20 years?
0 is taken when there is no corrosion. 10 years, 20 years – no problem. In such situations, design and manufacturing units generally choose 10 years. And the units of use should all be written out in full. It’s just a matter of standing from different perspectives (with different interests).
10 years or 20 years, to be determined by the user in the design commission.
For the corrosion margin, just calculate it as annual thinning over * years – nothing else needs to be considered. For periods of over 10 years, just write any number; it’s just to make him happy. Anyway, there are no real legal restrictions regarding the design life