riello air tube

[Deleted User]

i have several boilers running with an 80 deg solid nozzle per oem spec in wet base boilers and i am seeing some air tube burn off has anyone else had same problems... they are 40 series f-5's fired with a .85 x 80b delavan nozzles. no amulet protecter is on tube...thanks mike

Weezbo

nope.

they are the cleanest . you are mid ranging it so it should be like Perfect ..

Big Ed

End Cone

> i have several boilers running with an 80 deg

> solid nozzle per oem spec in wet base boilers and

> i am seeing some air tube burn off has anyone

> else had same problems... they are 40 series

> f-5's fired with a .85 x 80b delavan nozzles. no

> amulet protecter is on tube...thanks mike



End cone burn off is caused from heat reflectiion from a hot chamber after burner shut down.

What

Big Ed

End Cone

End cone burn off is caused from radiant heat off a hot chamber after burner shut down.

What type of boiler are you using ?
Is the tube setting flush or pulled in slightly from the face of the chamber insulation?

I know some boiler oem specs call for 80* nozzles when using a riello, but I found bad results using the.They build a lot of carbon on the air turbulatorswhen using them..

I first give the oem a try, any found flaws I switch to a 60* S or W..

Firedragon_4

Bad draft

can also cause this. Just had a client who cooked one due to a partially plugged chimney.

Weezbo

ed is giving you a good idea or two...try 60 degree

and make sure all your settings are what you have set... loose liners ought to be set right ...target walls i leave in incase of cold oil sputter...basically a thing of the past with me...safety foist

S Ebels

Can also be

A sign of a dirty or partially restricted boiler. Pull a nozzle and check to see if the screen portion is dark and discolored. This can be an indication of heat soaking into the nozzle and baking the oil in the gun after shut off. At any rate your retaining too much heat on the end of that gun for some reason. The degree spray pattern has more to do with the shape/length/size of the combustion chamber than anything else.

Ragu

Mike

Never have seen it in a Riello. I've got close to 80 out there, but they are all OEM boiler/burner applications. Were these retrofitted? All settings per spec? Excessive heat retention for sure. Draft/venting problem. All the same brand boilers????????

[Deleted User]

air tube burn off

sorry i did not respond sooner with more info but my own home had some damage from the delaware river over flowing.. the burners are installed in dynatherm boilers,which operate under positive pressure. boilers are clean and no flue bockage. i am working with manufacture but they have not seen this problem. they fire into a 8" combustion chamber with 18" of refractory on bottom and 24" long chamber. thanks for all replies....

todd s

airtube burnoff

Does the system utilize a post purge? Is it possible that the residual heat in the chamber is cooking it?

S Ebels

If I'm reading you right

Your combustion chamber is 8" in diameter, 24" long and the brick on the bottom is 18" thick????

Rule of thumb, a narrow or tubular shaped chamber will use a narrower spray pattern than a short, round shaped one. Think of the shape of the flame needed to burn inside a beachball as compared to a piece of pipe measuring 10" in dia x 24" long.
I'd start with an 80* in the beachball and a 45 or 60* in the pipe.