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Discuss Potterton statesman 45/50 nozzel size? in the Oil and Solid Fuel Forum area at UKPlumbersForums.co.uk.

  1. Inverness

    Inverness Plumber GSR

    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.
  2. DjClubber

    DjClubber GSR

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

    Attached Files:

  3. Inverness

    Inverness Plumber GSR

    Can't seem to download it mate
  4. SJB060685

    SJB060685 Top Contributor!!

    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.
    • Like Like x 1
  5. Tea-Break

    Tea-Break Member

    You can easily find the manuals on line.
    Unfortunately, they do not seem to contain combustion settings. So you’ll have to work it out.
    My calculations make it .45 US Gals @ 100PSI = 50000BTUs (15kW).
    • Like Like x 2
  6. SJB060685

    SJB060685 Top Contributor!!

    My calculations suggest you need a 0.45gph nozzle at 8 bar pressure
  7. SJB060685

    SJB060685 Top Contributor!!

    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
  8. SimonG

    SimonG Trusted Plumber

    How many nozzles do you carry. I have about 80 to 100 on the van.
    • Like Like x 1
    • Agree Agree x 1
  9. SJB060685

    SJB060685 Top Contributor!!

    Anyone working with oil should have a variety of sizes, angles and patterns
    • Like Like x 1
    • Agree Agree x 1
  10. MikeJhn

    MikeJhn Active Member

  11. bogrodder

    bogrodder Plumber GSR

    Well that’s just god damn greedy...

  12. Tea-Break

    Tea-Break Member

    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.
    • Agree Agree x 1
  13. MikeJhn

    MikeJhn Active Member

    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: Feb 10, 2019
  14. Best

    Best Trusted Plumber

    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)
    • Like Like x 1
    • Agree Agree x 1
  15. MikeJhn

    MikeJhn Active Member

    To obtain 0.75 from 75,000 you would need to divide by 100,000.
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