Do the threads of the bolt need to be calculated?
Thread Content
When calculating bolts, we often check their outer diameter to see if there might be a situation where the threads come loose without the bolt breaking For example, when a bolt is subjected to normal stress rather than shear stress, should the threads be taken into account? :(
There must be design calculations for this, but they shouldn’t be carried out during the selection of equipment flanges or pipeline flange bolts.
The bolts used for the flanges of normal equipment and those of process pipelines are all standard bolts, with a pitch of 1.5. No special calculation is needed.
Standard bolts are designed through calculations and manufactured in strict accordance with standards; even if the bolt breaks, its threads will not come loose.
The major is in mechanical equipment, not chemical engineering equipment; everyone should have studied mechanics principles and mechanical components, with specific focus on the calculation of screw strength – relevant books can be used for learning this. Chemical engineering equipment should also offer this course. It’s just that the directions of discussion are different.