For studs used in high-pressure containers, is it better to have full threads or a bare shaft in the middle?
Thread Content
For studs used in high-pressure vessels, is it better to have full threads or a bare shaft in the middle (that is, Type B or Type C)? What is the difference between the two? Experts, share your opinions!
The advantage of full threads is that there are no changes in cross-section along the entire length of the stud, thereby avoiding localized stress concentration; therefore, bolts for high-pressure vessels should preferably have full threads.
Is it better to have high pressure or full threads? The one with equal lengths and two ends isn’t as good as this one
After reviewing relevant information, it is better to use studs for high-pressure vessels with a smooth shaft in the middle.
I also think full-threaded ones are better, as they prevent stress concentration
The explanation in the comprehensive book on chemical engineering equipment design – High-Pressure Vessels – can serve as a reference for everyone
It depends on the specific circumstances; there is no universal rule. In situations where the temperature difference is small and the temperatures are not high, fully threaded ones are likely the better choice. On the other hand, those with thin shafts are better, as they can adapt to changes in temperature differences and adjust the stress distribution, while also ensuring good sealing performance.
There are specifications on the scope of application in HG/T20613
Special high-strength studs are better; fully threaded studs are merely more convenient to use