In pre installation verification testing of bolts per RCSC, my understanding is that you are testing to verify that the bolt assembly will not fail at the prescribed KIPs per table 7.1 and to ensure that the pre tensioning method used will reach the prescribed kips. For instance, with turn of the nut, if the tension does not reach the prescribed kips at the prescribed rotation, i.e. 1/3 turn, does the bolt fail, or is the allowable plus 60% rotation allowed to be used at this point? I have always viewed it as the +60 applies to installation only and not testing. The way I see it, if the assembly does not reach the prescribed tension with a 1/3 turn (for example) then testing has shown that the method does not work with that bolt assembly. I have been told by our lead that in testing, nut rotation does not matter and you are only verifying that the assembly can reach the desired kips and you can turn it as much as you need to get the kips. The way I am reading the code, the latter is incorrect. Can anyone clarify this for me with referenced reasons as to why?
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.
When making CNC machined parts, mastering tolerances can be challenging. Are general tolerances good enough? When does it make sense to call out for tighter tolerances? Do you need a better understanding of fits, datums, or GD&T? Learn about these topics and more in Xometry's new e-book. Download Now
When designing a metal component, engineers have to consider how susceptible certain alloys are to corrosion in the final product’s operating environment. In a recent study by NACE (National Association of Corrosion Engineers), it was estimated that the direct and indirect costs of corrosion in the United States is approximately 6.2% of the GDP. In 2016, that cost exceeded $1 trillion dollars for the first time. Download Now
With all of the hype around 3D printing, it can be easy to get lost in fascinating, intricate metal parts made with additive manufacturing. These parts, while impressive, are probably dissimilar from many of the parts you currently produce or use. So why invest in metal additive manufacturing? Download Now