Potterton statesman 45/50 nozzel size?

Post new thread

Discuss Potterton statesman 45/50 nozzel size? in the Plumbing Jobs | The Job-board area at PlumbersForums.net

Inverness

Inverness

Plumbers Arms member
Plumber
Gas Engineer
Messages
710
cant find the spec I need to service this boiler and I'm not planning in making two visits so getting info and parts ready but can't find any info on the nozzel size.Any advice would be appreciate.
 
Inverness said:
cant find the spec I need to service this boiler and I'm not planning in making two visits so getting info and parts ready but can't find any info on the nozzel size.Any advice would be appreciate.
Click to expand...

This may Help... Ive got more or less all Oil Boiler Manuals Handy. . .
 

Attachments

  • Potterton-Statesman 45-50L.pdf
    2 MB · Views: 22
  • PDF file.pdf
    1.5 MB · Views: 19
If you have OFTEC books or even their pocket guide it will show you how to calculate a suitable nozzle size and pressure depending on burner output needs. I did look online quickly but couldnt see the nozzle sizes etc in a manual.
 
Bare in mind a slightly bigger nozzle will require less pressure and a slightly smaller one will require more. Neither Tea-Break or I are wrong, we’ve just worked it out slightly differently, however too low a pressure and the fuel won’t atomise properly
 
MikeJhn said:
The RDB1 manual says 10bar Page 8 Table A for Kerosene.

https://www.rielloburners.co.uk/images/content/downloads/RDB1-2_2902489-18.pdf

And this should give you the nozzle needed: http://www.delavaninc.com/pdf/total_look.pdf
Click to expand...
I think this relates to the generic pump pressure range.
The boiler in question is quite small 45/50.
Therefore the correct nozzle should be .45-.50.
As SJB correctly states, going below 100PSI is not recommended.
To return to the the original post. Without wishing to be condescending, this is all bread ‘n butter stuff for any oil engineer.
 
It's categoric at a maximum of 10bar, how many times do we see posts that say follow the manufacturers instructions, concerning pump pressure and nozzle size.

The Delavan catalogue on page 7 also says to find the correct nozzle:

GPH = BTU Input / 140,000 or GPH = BTU Output/(Efficiency %) x 140,000
 
Last edited:
Ten bar is really too high and is a max limit for oil pumps on kerosine I believe. Higher can damage the pump
7 to 9 bar is range.
Diesel can be higher.

On outputs you will find the nozzle size will closely match x 1000 the btus with kerosine.
(.75 nozzle at 7 or 8 bar kerosine usually going to give 75,000 btus or more)
 
If you read burner manuals especially Riello it clearly states that it’s 10 bar max for kerosene, for the very reasons Best has mentioned above, class D is usually higher pressure and different nozzles/patterns. I didn’t feel the need to mention this before as anyone working with these burners should know this and study all sorts of manuals. As best said usual range is between 7-9 bar, but like I said too low and you’ll get atomisation and combustion problems.
If you haven’t got one already Inverness phone OFTEC and buy their pocket guide, if I remember correctly it’s about £5 plus delivery. It has these calculations in there plus all the other important information for checking tanks etc etc.
 
That's what I said 10bar maximum, the OP posted they did not have the manual for the unit, so I posted what I thought was a helpful link to the burner and nozzle calculations, the criticism's where unnecessary, be helpful by all means, but don't denigrate others for trying to help.
 
MikeJhn said:
To obtain 0.75 from 75,000 you would need to divide by 100,000.
Click to expand...

Lol! True! I did post that at 2.40 am. :)
Although tbh I just always have in my head to add 3 zeros to the smaller nozzles size (without thinking of the position of the point)
But as you say, multiply by 100,000.

Just was something I always noticed with boilers on kerosine and still applies as a rough guide despite the increase in efficiency in HE boilers.
 
Best you say multiply smaller nozzle size by 100000 to get btu’s. At what pressure is this assuming? And I assume this figure is burner input, not boiler output or efficiency must be taken into consideration?
 
SJB060685 said:
Best you say multiply smaller nozzle size by 100000 to get btu’s. At what pressure is this assuming? And I assume this figure is burner input, not boiler output or efficiency must be taken into consideration?
Click to expand...

Only saying that as a very rough estimate of boiler output for kerosine and at 7 bar or 8 max oil pressure.
At 9 bar the output will be higher.
Just really judging that on all boiler specs, of various types.
Nothing to rely on, but just an indication that a nozzle on a boiler you go to is wrong size.
 
Yeah I just done some examples on my EOGB calculator and what you say is a vary rough figure, depending on pressure and efficiency. I’ll stick to what I know lol
 
Of course its correct, It's an international standard for all manufacturers that they quote the output of their nozzles in GPH at 100psi I should think that everyone on this thread knows that.
 
MikeJhn said:
Of course its correct, It's an international standard for all manufacturers that they quote the output of their nozzles in GPH at 100psi I should think that everyone on this thread knows that.
Click to expand...

US gallons per hour at 100 psi, which always seem weird to me, but that’s how it is
 
Our UK gallons is roughly .84 of a US gallon if I’m not mistaken, but yes Best it relates to US measurement as I believe the pressure jet burner is originally an American invention
 
SJB060685 said:
Our UK gallons is roughly .84 of a US gallon if I’m not mistaken, but yes Best it relates to US measurement as I believe the pressure jet burner is originally an American invention
Click to expand...

I also tend to think on oil output of a US gph nozzle approx same in our UK gph if oil pump is set at 8 bar.
US gph is at 100psi, so at 8 bar it is 120psi which is close to converting the US gallons output to our gallons.
So say a 1.0 nozzle at 100 psi will give .84 UK gph, but multiply by 1.2 (to raise to 8bar) will give approx 1.0 UK gph.
If that makes sense. :)
 
Last edited:
The first pressure jets where used to propel vehicles and where invented by the Russian N Teleshov in 1864, adapted by a Swedish inventor Martin Wiburg and eventually became the pressure jet burner.
 
MikeJhn said:
The first pressure jets where used to propel vehicles and where invented by the Russian N Teleshov in 1864, adapted by a Swedish inventor Martin Wiburg and eventually became the pressure jet burner.
Click to expand...

Wow! Where did you find all that from?
 
A little confused there I think, a 1.0 nozzle at 100psi will give 1US gph or 0.84UK gph, got your UK and US mixed up, easy done, but as you say raise the pressure to 8bar (116psi) and it will give approximately 1UK gph.
 
Last edited:
MikeJhn said:
A little confused there I think, a 1.0 nozzle at 100psi will give 1US gph or 0.84UK gph, got your UK and US mixed up, easy done, but as you say raise the pressure to 8bar (116psi) and it will give approximately 1UK gph.
Click to expand...

No, definitely not confused, although I could have worded my post a lot better. :)
I was saying exactly what you have summarised, - .84 of a U.K. gallon will become close to nozzle reading in U.K. gallons if we have 8 bar setting.

Ah! See what you meant, - I had indeed typed US at the .84!
 
Last edited:
MikeJhn said:
Cheeky you have edited your post.
Click to expand...

I did. I reread my earlier post and realised it didn’t read as I had intended.
:p
Just 2 letters made it read wrong.
I had assumed my wording was confusing, rather than actually wrong as you rightly noticed.
 
I could of sworn I resd the Americans were the first to utalise the PJ in the burners we’re familiar with, maybe invented was the wrong word lol
 
It may be true that the pressure jet CH burner was developed in the US and under their funny way of looking at things, to them it means they invented it and can apply for a patent and woa betide anyone in the world that infringes this, they would build a wall around them. LOL
 

Reply to Potterton statesman 45/50 nozzel size? in the Plumbing Jobs | The Job-board area at PlumbersForums.net

Similar plumbing topics

S
Advice needed for a mixer Spray for kitchen ?
Hello plumbers in my internet. So the Mrs want a spray mixer tap in the kitchen as we had two separate taps. I changed the tap for a temporary two...
Replies
2
Views
233
Lou
Lou
M
Central heating losing pressure all the time
Every two weeks or so I have to go and top up the system because the hot taps are running cold. Boiler display is flashing 0.6 bar and I fill up...
Replies
2
Views
299
PSxxxxxx
P
ian.
UK Auto balance trv and Ideal Vogue boiler
I have an ideal vogue max S18 boiler and I’m considering fitting auto balancing TRVs, my question relates to the boilers pump. I see a boiler...
Replies
1
Views
198
John.g
J
P
LCS to new water mains
Hi, I have an old steel water mains pipe (approx 45mm) that I need to connect to a new pehd water mains (25mm). I can't get at it to create a new...
Replies
2
Views
260
ShaunCorbs
ShaunCorbs
T
22mm MDPE connection
I want to reconnect some outbuildings to an existing water supply. The supply pipe is old 22mm MDPE and buried for a fair distance so not going...
Replies
1
Views
328
ShaunCorbs
ShaunCorbs

Newest Plumbing Threads

Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock