Nozzle size help

cruiser202006

Anyone any ideas for nozzle size for a 300000 btu boiler with a g10 riello burner?! Can't find any info on the boiler itself. House is about 5000 sq ft with cast iron radiators The plumbers who were in it fitted a .65 80 s nozzle

esox28

What's the kw input of the boiler?

Wearb

cruiser202006 wrote: »

Anyone any ideas for nozzle size for a 300000 btu boiler with a g10 riello burner?! Can't find any info on the boiler itself. House is about 5000 sq ft with cast iron radiators The plumbers who were in it fitted a .65 80 s nozzle

If the demand for heat is near the capacity of the boiler, you will need a nozzle 3 or 4 time that size. Some of the more experienced lads here may be able to be of more help.
How well was it heating with the old nozzle?

cruiser202006

esox28 wrote: »

What's the kw input of the boiler?

U mean output?! 300000 btu or 88 kW boiler Very little info whatsoever on boiler!

jimf

you would really need to calculate the btu requirements imho but a .65 in that size boiler would be like trying to boil a kettle with a candle

scudo2

cruiser202006 wrote: »

Anyone any ideas for nozzle size for a 300000 btu boiler with a g10 riello burner?! Can't find any info on the boiler itself. House is about 5000 sq ft with cast iron radiators The plumbers who were in it fitted a .65 80 s nozzle

Its a proper, experienced oil service engineer with a combustion analyzer that you need.
Defenataly not somebody with a .6 nozzle !!!


You would need around a 2gph nozzle +experience.

cruiser202006

Wearb wrote: »

If the demand for heat is near the capacity of the boiler, you will need a nozzle 3 or 4 time that size. Some of the more experienced lads here may be able to be of more help.
How well was it heating with the old nozzle?

I was thinking a 1.75 myself but I Wudnt have much experience with large boilers like this! He hasn't had it running much but said is hard enuf on oil getting house up to temperature as he's only running it out of an expansion tank on top of boiler

esox28

ok,
Do you need 88kw output from boiler?

What heat input/ load do you need for ch and dhw?

I have a nozzel sizing chart for com. Boilers I'll route it out for you when I get to the van this evening.

Dtp1979

Roughly 2.5-2.75 @ 9 bar

cruiser202006

Called in to house today and done a few calculations and would be looking for around 275000 btus or 80 kws including allowances for a 200 litre cylinder and a 100 litre cylinder House is also insulated on all outside walls with a 50mm insulated slab

esox28

1.65 gph 60*s will give you 80kw @ 12 bar pressure. Gas oil.

A rough guide to sizing is...
Burner output / 12.99 = nozzle size (kg/h).

jimf

cruiser202006 wrote: »

Called in to house today and done a few calculations and would be looking for around 275000 btus or 80 kws including allowances for a 200 litre cylinder and a 100 litre cylinder House is also insulated on all outside walls with a 50mm insulated slab

any joy with details from boiler

cruiser202006

No joy! Massive boiler had to really stick the arm in with the lance when cleaning it with the dual-x.

cruiser202006

esox28 wrote: »

1.65 gph 60*s will give you 80kw @ 12 bar pressure. Gas oil.

A rough guide to sizing is...
Burner output / 12.99 = nozzle size (kg/h).

So with kerosene Dtp1979 wouldn't be too far wrong with a 2.5 nozzle @ 9 bar Will be fully set up wit Fga. Boiler was ridiculously over aired with the .65 nozzle. Oil pressure was 8 bar. Air Was set at 7!

jimf

takin detail from a firebird se boiler of the same output on kero

using a 2.5x60s nozzle at 8bar = 280000 btu this is only a guide not saying its correct for your application

jimf

cruiser202006 wrote: »

So with kerosene Dtp1979 wouldn't be too far wrong with a 2.5 nozzle @ 9 bar Will be fully set up wit Fga. Boiler was ridiculously over aired with the .65 nozzle. Oil pressure was 8 bar. Air Was set at 7!

based on that damper setting id say the original nozzle wouldn't be far away from above

scudo2

jimf wrote: »

based on that damper setting id say the original nozzle wouldn't be far away from above

G10 could not work safely with a .6 nozzle, or anywhere close.
Not suitable for large blast tube.
Carbon monoxide would be through the roof.
Boiler will be full of crap at this stage.

cruiser202006

scudo2 wrote: »

G10 could not work safely with a .6 nozzle, or anywhere close.
Not suitable for large blast tube.
Carbon monoxide would be through the roof.
Boiler will be full of crap at this stage.

Don't think it was running much as chamber and baffles weren't too bad. Just a couple of 10 gallon cans were burned as I've to pressure test oil line and check tank for water before he fills.

jimf

scudo2 wrote: »

G10 could not work safely with a .6 nozzle, or anywhere close.
Not suitable for large blast tube.
Carbon monoxide would be through the roof.
Boiler will be full of crap at this stage.

its even amazing the flame was able to establish

jimf

scudo2 wrote: »

G10 could not work safely with a .6 nozzle, or anywhere close.
Not suitable for large blast tube.
Carbon monoxide would be through the roof.
Boiler will be full of crap at this stage.

I didn't mean the .65 scudo :eek::eek:

esox28

Kero
80/12.99 = 6.15 kg/h

2.25gph 60s @8 bar
3.5 combustion head set point
3.5 air set point +~-

jimf

how you fare out with this in the end cruiser

DGOBS

2.5 USgal/h (S pattern)@ 8 bar would output 90kw (this is at 90% efficiency and keri)
2.25 USgal/h @ 8 bar would output 81kw

Normally commercial boilers are calculated using this efficiency level.

cruiser202006

Fitted a 2.25 60s nozzle dis morning! With pressure at 8 bar!! A lot better than the 15 BAR that it had been running at before!!

Dtp1979

cruiser202006 wrote: »

Fitted a 2.25 60s nozzle dis morning! With pressure at 8 bar!! A lot better than the 15 BAR that it had been running at before!!

What kind of readings did you get

cruiser202006

Dtp1979 wrote: »

What kind of readings did you get

Set same as I'd set up a firebird. 11.5 co2 and 5.5 o2. Co was 47. And using half the amount of oil!