Encountered exhaust pipe noisy sound

[acmvme]

Hi,

Plese help for me to identify the root cause about exhaust pipe noisy sound.

We have a exhaust pipe (fiber glass) and during operation we encountered noise sound on pipe,, This 4'' dia pipe have 4-units equipment connected on it. and one of the equipment sometime off and sometime running but during starting of this machine encountered noisy sound inside the pipe and and after minutes that sound was subside.

any ideas what is the root cause.

thanks
acmv me

 

[MintJulep]

Do you want guesses? Because that is all that is possible due to the complete lack of information provided.

 

[MiketheEngineer]

Vibration?? and a WHOLE LOT of more info is required!!

 

[MikeHalloran]

If you've got four _engines_ connected to one exhaust pipe (fact not in evidence), and any of them have run for more than an hour or two, the ones that weren't running at the same time now have corroded cylinder bores and/or exhaust valves, and are now junk.





Mike Halloran
Pembroke Pines, FL, USA

 

[asimpson]

Something in the pipe is resonating. When it heats up its resonant frequency changes due to lowering stiffness.

Or on heating resonanation is damped out by mechanical distortion.



Is this a problem? Depends on many things. could indicate immonant catrosophic failure or minor nusance.

 

[MiketheEngineer]

Vibration is basically resonance - lock it down and see what happens. For that matter - just grab it with your hand AND wear a glove if its HOT and see if that helps. If it does - you now know to just lock her down!!

 

[acmvme]

this problem is related at industrial plant,

again..

we have a scrubber exhaust and our exhaust pipe using fiber glass size of 4'' dia ,This 4'' dia pipe have 4-units equipment connected on it. Depending on the production on the plant, that sometimes 3-units equipment are the only that was running and the 1-unit was off. When the time that we need to run the 4-units equipment and started to run the 1-equipment that was been turned-off, this equipment encountered noisy sound inside the pipe and after few minutes the sound becomes normal.

my first conclusion is during start-up on 1-equipment there's a big flowrate that travels to 4''dia pipe that cause the noisy sound...

please advise if this correct


thanks

 

[MintJulep]

Do you want more guesses? Because that is still all that is possible due to the complete lack of information provided.

 

[MiketheEngineer]

With four units online - your exhaust maybe going sonic??