Why are 0.6MPa fasteners used for 1.0MPa flanges
Thread Content
Why are 0.6MPa fasteners used for 1.0MPa flanges? In some designs, 0.6MPa fasteners are used with 1.0MPa flanges – why is that? Is it to save costs, or because the pressure isn’t high enough to require higher-grade fasteners?
I don’t know; it seems there’s some problem. If you’re trying to save money, it won’t help you save that much this way
How can one tell that it is a bolt with a strength of 0.6 MPA? Could it be that different standards lead to different specifications being used, or is it perhaps indeed a labeling error?
The pressure rating isn’t very high to begin with; the choice depends on the actual circumstances, so there’s no need to worry too much about it
What type of fastener corresponds to what kind of stress?
It doesn’t seem to have a corresponding relationship, does it? I’m not entirely sure, but I think SW^6 can be used to perform calculations on flanges; the specifications and quantities of the corresponding fasteners need to be entered, and if the calculations meet the strength requirements, then it should work fine. Personal opinion, for reference only.
By calculating the stress level of each bolt in the flange, as long as it does not exceed the allowable stress for those bolts, it should be fine, right?
Take a close look at HG20592-97 and you’ll understand.
Fasteners do not have pressure ratings; only the material choice matters.
What was said upstairs is correct; in fact, the material and pressure are related to each other
This way, no money will be saved, and it’s also possible that something will go wrong – was that a mistake?
How did LZ know that the fasteners had a strength of 0.6 MPa? Commercial-grade bolts can be used for pressures below 1.6 MPa. It seems there is no specified pressure rating.
Flange fasteners for 1.0 MPa applications and those for 0.6 MPa applications should be similar in material (subject to the external environment), but there are many differences in their specifications; for the same diameter, the fasteners intended for 0.6 MPa applications are likely to have smaller dimensions and a shorter length
It doesn’t make any sense; the savings amount to very little. As long as the bolt length meets the requirements, that’s sufficient. Nevertheless, procurement should still be taken into consideration during design – there’s no need to use so many different types