A research to
determine an optimal location of a circular cross bore in thick walled high
pressure vessels was conducted. Cylinders of thickness ratios of 3.0 down to
1.4 with circular cross bore at varying offset position were studied. The
effects of a small circular cross bore, having cross bore to main bore size
ratio of 0.1 was studied at nine different offset locations. It was established
that offsetting of circular shaped cross bores appropriately reduces the
magnitude of Stress Concentration Factors (SCFs). Among the nine offset
positions studied, the minimum SCF magnitudes occurred between offset location
ratios of 0.685 and 0.9. Besides, the optimal location was found to be at 0.9
offset position at the thickness ratio of 1.4, with a SCF magnitude of 2.312.
This SCF magnitude indicated a reduction of pressure carrying capacity of 56.7%
in comparison to a similar plain cylinder without a cross bore.