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Steam boiler

Piping diametet

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Arthur Goodwin19/08/2021 09:51:55
63 forum posts
42 photos

Hi all

I have built a little vertical boiler to power my Stuart Victoria.

Have had it running using 3/16 diameter copper pipe but my steam pressure drops rapidly.

Would I be better using smaller tube? Also i have invested in a ceramic burner (minus jet and feed pipe) the reccomended jet isa number 5 with an orifice of 0.02 mm.

Why is it so important when the fuel then immediately post orifice goes into a large chamber. Just wondering if anybody can enlighten me.


JasonB19/08/2021 10:04:05
21468 forum posts
2455 photos
1 articles

Depends on what you term a "little" boiler as it may simply be that the boiler cannot keep up with the demand of the engine

Stuarts list their 504 boiler as only suitable for running the Victoria for "display" , this is a 3.5" dia x 10" long boiler, how does that compare size wise with yours?

Shape of the burner causes a venturi effect and draws in air that mixes with the fuel so it will burn cleanly and efficiently

Edited By JasonB on 19/08/2021 10:05:29

noel shelley19/08/2021 10:07:27
770 forum posts
19 photos

You say nothing of the size of boiler ! As I found to my cost you need a much bigger boiler than one would think and quite some heat to get things to work for more than a few seconds ! I ran a ST No 1 on a pressure cooker with 1Kw heater it only Just ran. The pressure cooker Hi, all 3 weights is 15psi for those who want a cheap test boiler, remove the rubber grommet and T valve and fit a brass elbow to pipe up. Good luck. Noel

Arthur Goodwin19/08/2021 18:00:33
63 forum posts
42 photos


Thanks for your prompt reply.

My little boiler is indeed too small being only 3 inches by 7 inches (oddment of tube in my workshop).

It was nice to see it running though, albeit for a short time.

fizzy19/08/2021 18:46:02
1819 forum posts
120 photos

With a bore of 1" and a stroke of 2" you will need a lot of steam. A customer bought two of our 5" diameter boilers to run a ham radio generating set running twin Victoria engines which worked well. **LINK**

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