Pulsating heat pipes (PHPs) are the two-phase flow based thermal management devices prominently researched and developed over a last few years. Their applications for the systems consisting of dense electronic circuitry have been considerably explored. Several installations have been found to be running successfully. But, still there are several industrial thermal management domains practically untouched by the pulsating heat pipes, due to the poor reliability levels of the latter. As the reliability majorly depends upon the tendency of PHP oscillations to sustain or decay, so the authors focused over the sustainability of oscillations as the primary concern rather than the concerns regarding performance level of an operating PHP. So, this paper gives a computational insight about what all determines the likeliness of oscillations to sustain or decay. Focus has been put over some extremities leading to the oscillations which always decay. Limelight has been given to the effect of “operational triad” on the sustainability of oscillations. Operational triad which influences deeply the sustainability of oscillations, has been taken as a combination of the hot and cold section temperatures of PHP, and the fluid reservoir pressure. Various combinations of these three elements of the triad have been explored, to determine what kinds of their combination promote the oscillations to decay and what all kinds of their combination promote the oscillations to sustain. For different extremities within the triad, the mechanism and factors owing to the decay of oscillations have been studied in details. For each case, graphical solutions have been found and PHP functioning has been visualized. © 2017, Begell House Inc. All Rights Reserved.