FATIGUE LIFE OF COMMERCIAL HIGH PRESSURE NEEDLE VALVES AND TEE ASSEMBLIES

摘要

This paper investigates the design cycle life of commercially available 9/16 inch needle valves and 9/16 inch tees under tri-axial fatigue. The valves and tees investigated were manufactured from 316 stainless steel and are rated to 4100 bar (60,000 psi) maximum allowable working pressure. The testing was performed using a tri-axial fatigue machine originally designed by Dr. B. Crossland, Dr. J.L.M. Morrison and Dr. J.S.C. Perry in 1960 [1] and upgraded by Michael D. Mann of KMT Waterjet Systems, Inc. This investigation compares the fatigue life of the 9/16 inch needle valves and 9/16 inch tees from two different commercial sources via actual test results from the fatigue machine.