True or False Questions – Dry Gas Recovery and Wastewater Stripping Version: One Question per Day 6.03
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Fine-threaded threads have a higher connection strength than coarse-threaded threads. ( ) correct
Correct. If a precise calculation is carried out, assuming that the description of the load distribution in the book is correct, then the number of turns has no effect on the load per turn; the load is calculated as 1/3, and thus both coarse and fine threads result in the same value. When considering the load as being distributed along the pitch diameter, for a cantilever beam, since fine threads have a smaller thread height, i.e., they are shallower, the distance over which the force acts is shorter, resulting in a lower bending moment. Therefore, the calculated bending strength might not necessarily be lower than that of coarse threads. However, the shear strength at the root of the thread is definitely lower than that of coarse threads. Hence, it is necessary to compare all the calculation results comprehensively before drawing a conclusion...