maximum at pass 4. These variations are substantial
even at the last pass when all the bolts are tightened
in clockwise sequence. Thus it is concluded that the
scatter in axial bolt stresses deeply affects the sealing
performance of a joint. Contact stresses significantly
vary in the circumferential direction and the variations
are increased remarkably with each pass.
During all the passes, the maximum contact stress
difference is between bolt location G2 and G6.
Gasket areas along G2 and G3 are at higher stress
levels as compared to location G6 and G7. This indicates
the possible location of leakage from the
flange joint.