Boiler for propelled steamer SCHONDORF

[andy]

Hi,

here a pic of the new boiler. Horizontal type, made of Inox. Price was about 390€, I think that´s ok. Laser cutted and soldered very fine. Now I have to integrate it into the Model

Andreas

[kno3]

That boiler looks very good. Seems very practical since you can open it up and clean the inside when needed.

Who made it for you?

And why did you choose steel?

[derekwarner_decoy]

Hi PD's.......but I had trouble with INOX.....here in OZ we call it stainless steel

My good brother in law [metalurgist]  ...said I will get you a  ...yes a piece of S/S to replace the cast iron plate on the BBQ 

Well..... BLO*dy stainless steel is heat resisting....so the snagers in the middle of the plate got burnt, but the onions on the outside were not even browned

Moral of this story is ...... NEVER trust  stainless steel where thermal conductivity is concerned...sorry Andy...just my experience..... Derek 

[andy]

No Problem
the boiler of the PS DIESSEN model ist inox, too, since 30 years.
Brass is not hard enough to allow to me to make the boiler with thin plates and tubes.
I will check it with my compressor.

It was made according to my drqawings by a meatl worksho. Parts were laser cutted and then soldered together in a very fine way.

Andreas

[antopia]

hello Andreas
>I will check it with my compressor.

I do hope this is a liquid based compressor
air compressors for boiler testing makes a small hand grenade!!
use only liquids for boiler testing

Regards
Steven

[andy]

Yes, I know. Boiler will be filled and then pressure comes with the aircompressor without air volumne in the boiler.

Andreas

[antopia]

hello Andreas
>Yes, I know. Boiler will be filled and then pressure comes with the aircompressor without air volumne in the boiler.

sorry ,I had to say just in case.
that is  an interesting way to pressure test, I just use a hand mist sprayer good for 150 psi.

 

your boiler looks very neat and tidy,it does look tig welded (someone is very skilled)I am not up on what inox is I know in the UK
stainless steel is frowned on (history is, that on heating and cooling cracks appear just after the weld I used to know why!)but using the correct material (321 stainless i think is the correct grade)it should be a good boiler as people in the US use stainless for small boilers quite often.

good look with the testing.

Steven

[andy]

When testing, I will do this with a tube, so that the boiler ist behind a wall and me behind the other side.

Andreas

[derekwarner_decoy]

Hi PD's....Steven.......if you go back a few electronic pages  ...you will find a number of "experienced" model boiler builder...members have questioned the boiler designs & test procedures offered by Andreas......& these comments as offered must stand relating to 'EU' certification & standards etc ......

Having said this......when we review some of the brilliant engineering & craftmanship/craftpersonship@#$%^&* examples as demonstrated by Andreas...we must take a step backwards in awe.....Derek  

[andy]

Hi Derek,

maybe, that I already built steam models when you was picking out the grass out of your Teddy.

Andreas

[antopia]

Hi derek,

Hi PD's....Steven.......if you go back a few electronic pages  ...you will find a number of "experienced" model boiler builder...members have questioned the boiler designs & test procedures offered by Andreas......& these comments as offered must stand relating to 'EU' certification & standards etc ......

Yes I just had a look and know the answers,stainless is much stronger than copper so its performance is much better just needs a coded welder if my translation is correct we call it tig welding or Tungsten inert gas welding (Gasschweißen?) .Its just I have practical experience of heating and cooling
of stainless steel for a high powered gas burner used in removing (scarfing) slag from steel billets. every few months we had to re-weld the pipe work
because of cracks.it might be that the heat on a small boiler is not a problem,because of regulations here I could not build one for open use,at work we made/weld go faster (nitrous) gas tanks for cars .

I don't see a problem with a water filled  boiler using a compressor,just my method of a garden sprayer (10 atmosperes over natural earth pression
so andy understands ) or 150 psi so you can watch the object being tested as there is no danger only a wet bench if it fails.
I had a gas tank fail with a slight weep at 500 psi(33 atmosperes),solution was to make thicker end caps but I have a good pump.

[/quote]
Having said this......when we review some of the brilliant engineering & craftmanship/craftpersonship@#$%^&* examples as demonstrated by Andreas...we must take a step backwards in awe.....Derek  
[/quote]

I agree the boiler is beautiful workmanship/design/engineering I have seen boilers made in the US with similar materials then I look at my copper ones  and ....if only i could....

Steven

[andy]

http://picasaweb.google.de/a.heene/KesselSchondorf#

Hi,

here are some photos from the drawings of the boilers of my models. The 2 flame tubed one is the boiler of DIESSEN, made in 1978, and the little boiler with one flame tube is the SCHONDORF boiler.

The big one from DIESSEN has a heating- tome of about 5 minutes to have enough steam for the engine.

Pics are not so good, only taken with the camera. Might be possible to have them scanned, if somebody would pay it.

Andreas

[Harold H. Duncan]

Hi Andreas,
Very nice, (excellent in fact) both design and drawings. Hope mine comes out somewhere near as good as yours, and yes mine will be in inox as well. Made by professional Stainless Steel fabricators using laser cut parts and tig welded by them, to my drawings.
I do understand the concerns expressed re testing, but it is evident from all your past postings, you are very experienced, and you do know what you are doing. Mine will be tested professionally and come with certificate.
Keep up the good work
cheers
kiwi

[nije]

Re teting boilers - with the exception of abused steel boilers, they do not explode. The exploding variety are made of steel which has invariably begun to fracture, thats why model clubs dont want steel boilers. Of course you should have your boiler hydraulically tested first, but the myth relating to them exploding like bombs is unfounded. I have conducted destructive tests on copper boilers around 1 litle capacity - the weakest part of the seam starts to split and pressure is rapidly lost - very dangerous if you happen to be stood right next to it but very undramatic. They also start to go very odd shapes before going bust too! This is based on research and much personal experience and testing and only applies to my work with copper boilers.