Failure of a Copper Condenser Dashpot
A copper condenser dashpot in a refrigeration plant failed prematurely. The dashpot was a long tubular component with a cup brazed at each end. Stereomicroscopic examination of the fracture surface at low magnification revealed a typical ductile mode of failure. The failure was attributed to insufficient component thickness, which made the dashpot unable to withstand internal operating pressure, and to extensive annealing in the heat-affected zones of the brazed joints. It was recommended that the condenser dashpot design take into account the annealing effects of brazing. Hydrostatic testing at a pressure times greater than the maximum operating pressure prior to placing the component in service was also suggested.
Rakesh Kaul, N.G. Muralidharan, N. Raghu, K.V. Kasiviswanathan, Baldev Raj, Failure of a Copper Condenser Dashpot, Handbook of Case Histories in Failure Analysis, Vol 2, Edited By Khlefa A. Esaklul, ASM International, 1993, p 99–106, https://doi.org/10.31399/asm.fach.v02.c9001312
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