chimaney silencer

Dear All my friends,

I have to design silencer at chimaney outlet. The silencer can be easily designed for mechanical strength as per ASME section VIII standard. But now I have to design the silencer from acoustic point of view as I have to consider the db level of the sound generated due to very high velocity flue gases.

 please tell me which ASME standard can I follow to meet the requirement from acoustic point of views.

thanks in advance,

 Regards,

Abhijit Nalawade.