LPG Gas jet sizing

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LPG Gas jet sizing

This topic has 16 replies, 10 voices, and was last updated 7 September 2021 at 16:04 by Speedy Builder5.

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18 November 2015 at 13:20 #213013
michael howarth 1
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@michaelhowarth1
My Gauge 1 gas fired loco was running well until the gas jet, marked "10" became blocked again and again. I replaced it with a new gas jet marked "8" from my usual supplier, expecting perhaps a small loss in heat output. What I did get was a gas overload – great difficulty in lighting the ceramic burner and gas burning at the chimney even when the burner was alight. On inspecting number "8" it was clear that the orifice of the jet was much larger than the orifice of the number "10" jet. In general jet orifice sizes increase with the jet number but my limited research has discovered that different manufacturers eg blowlamp, camping stuff, LPG fires etc apparently use different jetting numbers. Does anyone know of a jet comparison/ cross reference/application type of chart that might throw some light onto this murky area?

Mick
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18 November 2015 at 13:20 #1473
michael howarth 1
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@michaelhowarth1
18 November 2015 at 16:10 #213048
Gordon W
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@gordonw
Sorry I can't help, but I do know that jet sizes refer to the quantity of fluid that can flow under given conditions. So I guess that the conditions are different for the makers ?
18 November 2015 at 16:58 #213059
Keith Long
Participant
@keithlong89920
Mick it might be worth asking on the 16mm narrow gauge modelling Yahoo group. I know there has been discussion of gas jet sizes and alternatives on there earlier this year. Keith
18 November 2015 at 20:44 #213104
michael howarth 1
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@michaelhowarth1
Thanks gents. I will have a look at the 16mm site.

Mick
19 November 2015 at 06:26 #213132
michael howarth 1
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@michaelhowarth1
I have had a look at the 16mm site and it is my impression that the correspondents are similarly searching in the dark. One post mentioned correct burner/jet design as being desirable if not essential but it went no further on detail. I feel that I now need to go back to basics and tackle this burner/jet design thing. Where to start? That is the question.

Mick
19 November 2015 at 08:41 #213137
maurice bennie
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@mauricebennie99556
Carburetter jets ? There is the SU manual .Burlen fuel systems . Worth a try

Maurice.
6 September 2021 at 19:29 #561613
Fred Graham 1
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@fredgraham1
Hi Folks,

Although I cannot, personally, vouch for these sizes they came from a good source, Mike the former MaccSteam boiler maker now retired

The sizes are Number 3 has 0.15 mm jet bore

Number 5 has 0..2mm jet bore

Number 8 has 0.25mm jet bore

Number10 has 0.277mm jet bore

Number 12 has 0.3mm jet bore

Number 16 has 0.35mm jet bore

I hope that will add some more to the general information source

All the best Fred Graham
6 September 2021 at 19:30 #561614
Fred Graham 1
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@fredgraham1
The first one should be 0.2mm not 0..2

Fred Graham
6 September 2021 at 19:43 #561618
Fred Graham 1
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@fredgraham1
Hi Folks,

Does anyone know who supplies jets for burners as most of the suppliers of boilers and burners do not seem to.

I found one the does called 'Maidstone Engineering Supplies' but there must be others. Someone mentioned a 'Usual supplier ' Who might that be?

All the best, Fred Graham
6 September 2021 at 21:17 #561637
Harry Wilkes
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@harrywilkes58467
May give Forest Classics a call link

https://www.forest-classics.co.uk/

No connection

H
7 September 2021 at 08:40 #561682
Fred Graham 1
Participant
@fredgraham1
Hi Harry,

Thank you for the Link but they don't seem to sell Jets. I tried there 'search bar' and it came back as not recognised, so it look like another supplier not stocking them, which Is surprising.

I will contact them again and see f I can get a clear 'yes or no' response.

All the best, Fred Graham
7 September 2021 at 09:33 #561691
Roger Clark
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@rogerclark
Posted by Fred Graham 1 on 07/09/2021 08:40:04:

Hi Harry,

Thank you for the Link but they don't seem to sell Jets. I tried there 'search bar' and it came back as not recognised, so it look like another supplier not stocking them, which Is surprising.

I will contact them again and see f I can get a clear 'yes or no' response.

All the best, Fred Graham

Not sure how much exploring you did but if you had scrolled down to the bottom of the page you would have seen a link to the page you need – gas essentials and jets

Roger
7 September 2021 at 10:12 #561701
Iain Pailing
Participant
@iainpailing54696
Hi Harry,

Try looking on the 16mm web site on the 'resources' pages. You could also try Anything Narrow Gauge, Chuffed to Bits, Roundhouse Engineering or possibly Garden Railway Specialists. If they cannot help they may be able to point you in the right direction. Might also be worth contacting Polly Models.

Hope this helps,

Iain
7 September 2021 at 10:31 #561714
not done it yet
Participant
@notdoneityet
Seeking advice from the supplier(s), after accurately describing the problem experienced, would be my course of action.
7 September 2021 at 15:10 #561754
Fred Graham 1
Participant
@fredgraham1
Hi folks,

Thanks for comments and especially Roger, OOPs did not notice that link on Forrest Classics, What a plonker!

Lost inside a paper bag and can't find the way out and poor explorer, to boot. Thanks again for keeping me right.

They seem to have a good range and reasonably priced too!

All the best, Fred
7 September 2021 at 16:04 #561764
Speedy Builder5
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@speedybuilder5
You can re-size a jet if it is made of brass.

Buy yourself a set of Swiss Broaches typical brands BERGEON No 1896 They are a bit pricey, but you may find some on various auction sites.
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