FST-200 Boiler Breeching Rumble after conversion to gas

jblum

There is a pronounced rumble in the horizontal breeching of the 200 horsepower FST-200 boiler with IC burner after conversion from #2 oil to natural gas.    The boiler and burner are is 20 years old and never rumbled before conversion to gas.    Part of the conversion involved installing a stainless steel liner in the vertical masonry chimney.      In the boiler room, the breeching was not changed, but it was re-insulated with lighter insulation after removing the old heavy lagging.



I am looking for referral to an specialist who can help.



Jim Blum

Weezbo

it is early , my first cup of coffee,

is it possible the combustion air requirements have not been met?

for a quick idea where to look?



if the room has an opening like a window or door to the outside

and you open it, during start up and testing ,

your results are different than with the window or door closed ,

Then , there is insufficient combustion air intake , for an example.



Safe

Weezbo

as i have not heard back from you

would you consider calling the mechanical contractor who installed the burner ?

Let them Know that this happened?

Thank You.

Steamhead

If memory serves

the Federal FST boilers run with a slight positive pressure in the firing zone. Check to see that the breech damper is properly set.



What were your combustion test readings?