Abstract: A Flowline Degaser (10) is provided which is positioned in a drilling operation between the bell nipple (24) and the shale shaker (34) and mud tanks (37). The degaser (10) includes a structure defining a downwardly inclined surface (62) for dispersing drilling mud flowing thereover to remove gas. The inclined surface also includes baffles (64) for agitating the drilling mud to remove additional gas. The gas is removed through vent ports (68, 70) and into an upper expansion chamber (76) for disposal. Blowers (82, 84) are positioned on the degaser for drawing a vacuum within the upper expansion chamber (76) and space (66) within the tank above the inclined surface to drive gas from the mud. The vacuum is sufficient to effect the mud at the bell nipple to prevent accumulation of gas about the bell nipple. This forms a significant safety factor in removing potentially explosive gas from the rig above the bell nipple.