Abstract
There was a possibility that hole-tone was generated in a main steam stop valve (MSV) and caused the vibration and sound noise in the main steam line of the thermal power plant. To reduce the sound noise and vibration, scale air tests were conducted in the present study. Hole-tone broke out in Mach number more than 0.18. Low height slant tubs installed in the MSV seat completely suppressed the sound noise due to hole-tone.
