Boiler harmonics

[Deleted User]

I have a customer that has two boilers connected to a primary loop in a parallel primary secondary piping connection. This system is supposedly a 40% mixture of propylene glycol and water. The system runs fine until the loop temperature reaches around 150*F, then the boilers start to hum and get worse as the temperature increases. Any ideas?

Paul Rohrs_4

Copper Fin-tube boiler?

Here is a link to a previous "Thread" about just such a noice. Mark Eatherton clears this up nicely.

http://forums.invision.net/Thread.cfm?CFApp=2&Thread_ID=37376&mc=16


Regards,

PR

Edward A. (Ed) Carey_3

Boiler Hums

Mike,

Maybe it just doesn’t know the words.

Sorry, I couldn't resist



Ed Carey

Rocky_3

Nice one, Ed...

> Mike,

>

> Maybe it just doesn’t know the words.

> Sorry, I couldn't resist

>

>

>

> Ed Carey