Nozzle Size

lee_7

why was boiler overfired? I am not familiar with this boiler, is it a multiple fired boiler ( three different nozzles for one boiler)? If not, nozzle should be lowered to correct size, pump pressure checked and set per specs and combustion effiency test taken.

Chas_2

Nozzle Size

With oil prices where they are, I have a question.
My Burnham PV84S steam boiler calls for a 0.85 x 60A nozzle, if I read the specs correctly.
I have been using a 1.00 60B Delavan nozzle.
Is that efficient, or should it be changed out for the nozzle spec'd out by Burnham?
Thanks for any help.
Bruhl

Chas_2

I don't believe that it ever "overfired", although I don't know what that means. It has the nozzle that the installer put in place originaly.
It is a standard Burnham boiler with a Becket Model AFG burner.
For some reason it has the 1.00 60B Delavan installed.
Thanks again.
Bruhl

lee_7

overfired means nozzle size bigger then is spec'd by manfuacturer. If paperwork states .85 x 60a and it has a 1.00 x 60 b, Something is wrong. Unless manufacturer says that is a correct nozzle size, I would "downfire" to .85 nozzle and adjust combustion with combustion analyzer. Just because that is nozzle installer put in does not make it correct.

scrook_2

a Burnham PV84S...

looks like it's a packaged(?) -- (i.e preassembled, vs. knocked down for shipping), V8 series, 4 section, steam boiler, rated 1.05 GPH (or 147,000 BTU/hr) input per Burnham's I&O manual.

Depending on the burner it uses a 0.85 or 0.90 GPH (at 100 psi) nozzle with a pump pressure of 140-150 psi for an actual firing rate 1.02 to 1.08 GPH.

Beckett: 0.85x60°A @ 140, Carlin: 0.85x60°B @ 150, or Riello: 0.90x80°B @ 145

Has someone perhaps installed a 1.00 GPH thinking it was fired at 100 psi (or actually turned it down to 100 psi) vs. the 140 psi spec'd (as it has the Beckett). You sure it's not a 0.85 nozzle *delivering* 1.0 GPH (due to the higher pump pressure setting)?

If the nozzle and/or pump pressure are changed it will have to be readjusted w/ instruments, as others have pointed out, to get the combustion right.

Chas_2

Thank you 3lees. just the information that I needed.
Thanks for helping out.
Bruhl

Chas_2

Hello scrook, and 3lees,
The boiler sticker says:
model number PV84ST-HBUR
firing rate light oil #2 1.05 GPH
DOE HTG CAP 127 MBH
NET MBR RATINGS STEAM 396 SQ FT
STEAM 95 MBH
Maximum nozzle size 1.00 GPH

Manual says:
V8 SERIES OIL- FIRED BOILER
in Table 6
Becket AFG [other ststs for Carlin and Riello]
V84S
firing rate GHP 1.05
head setting V1 [0]
air shutter 10
air band .5
NOZZLE GPH x Angle Type 0.85 x 60A
Pump Pressure 140

I don't have the slightest idea why there is a 1.00 60B Delavan installed, but that is what was installed per my recent service invoice, and what the original service person marked on the service sticker.

That's all I know, but I wanted to do it right, not just what was done last time.

Thanks again and best regards.

Bruhl