Hello fellow stressers,

I'm also interested to know from our fellow stressers if someone have specified a snubber for a two phase flow system and worked successfully in the field. For my 20 years as stress engineer I haven't specified one. I have done one vibration problem in the field related to two phase flow and fortunately a conventional hold down guide does suppress the low frequency vibration of around 3 Hz (a typical resonance problem). I just put a gap on the lateral direction since it is a high temperature piping and have a big thermal movement in the lateral direction. Fortunately the mode of vibration is on the vertical direction of the elbow (Caesar II mode shape matches the one observed in the field at approximately 3 Hz) and the thermal load is going down so a hold down guide does the trick since there is no upward thermal movement to absorb.


Warm Regards,