Study on Design of Fatigue Equipment in SA387Gr11CL2 with More Than One Million Cycles
Fatigue equipment is a common type in the petrochemical industry.The design fatigue curve is 1 million cycles(max.)based on JB 4732 annex C.But the case of more than 1 million cycles always exists in the actual engineering.For this case,the design method and design fatigue curve are not specified in the standards.A fatigue equipment in SA387Gr11CL2 with 3.15 million cycles was provided as an example.Five FEA models were built.The membrane stress and bending stress on the most dangerous cross sections were analyzed based on JB4732.The design fatigue curve specified in ASME CODE was adopted to carry out the fatigue analysis on the stud bolts and points with the largest stress.It was demonstrated that for the fatigue equipment with more than one million cycles,the method specified in JB4732 can be adopted to carry out stress analysis and fatigue analysis,in which the design fatigue curve in ASME CODE was used.But the inspections on the stud bolts shall be carried out more seriously and changing stud bolts at regular intervals shall be required,considering that the fatigue damage on the stud bolts were serious because of the cycles.
design of SA387Gr11CL2 fatigue vesselfatigue analysis for high cycle numbersfatigue life evaluation of stud bolts
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