Fracture of Teeth in an Oil-Pump Gear Because Ductility Was Inadequate for Shock Loading in Service
Two oil-pump gears broke after four months of service in a gas compressor that operated at 1000 rpm and provided a discharge pressure of 7240 kPa (1050 psi). The compressor ran intermittently with sudden starts and stops. The large gear was sand cast from class 40 gray iron with a tensile strength of 290 MPa (42 ksi) at 207 HRB. The smaller gear was sand cast from ASTM A536, grade 100-70-03, ductile iron with a tensile strength of 696 MPa (101 ksi) at 241 HRB. Analysis (metallographic examination) supported the conclusion that excessive beam loading and a lack of...
Fracture of Teeth in an Oil-Pump Gear Because Ductility Was Inadequate for Shock Loading in Service, ASM Failure Analysis Case Histories: Chemical Processing Equipment, ASM International, 2019, https://doi.org/10.31399/asm.fach.chem.c0047220
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