gas container

[Misterbee]

Interesting banter flowing freely on topic of gas container. My learnings from time in volunteer fire brigade were that LP gas when changing from liquid to a vapour, expands to 273 times its original volume in a hurry. When a gas cylinder explodes, it is known as a "BLEVE"  Boiling Liquid Escaping Vapour Explosion, also translated as Bloody Loud Extermely Violent Explosion.
Pressure vessels of any type are not for messing with, stick with proprietry lines and save weight somewhere else.
Misterbee

[derekwarner_decoy]

Hi PD's ...& welcome Paul R.....the Boiler Tester.. ... steam is a popular subject.. @ PDs' & I am sure your experience & future comments will be appreciated by many

With respect to one clarification...we understand that brass should not or be preferred for steam pressure vessels or lines...due to the leaching of zinc ...however no such issue exists with LP gas tanks......certainly my ACS/BIX tank is of brass shell & dished ends as is I understand the French range by ANTON & JMC ....the use of brass for such manufacture etc ....

regards Derek 

[Hankwilliams]

Hello Andy,

I've build 15 steamboats until now and for the most I've made the boiler and gas tanks by myself.

I made a pressure test of 25 bar with water, this should be sufficient. I never got problems of leaking or even exploding.
It is very improbabel, that the gas tank will explode, even when the temperature would reach more than 70 degree Celsius, but far more probable is, that the seals of the Valves will leak. So it's very important to have attention of the sealings.

All my gas tanks are made of brass tube of 1 mm strenght, the diameter is between 30 to 50 mm, lenght between
40 to 120 mm. Of course all tanks are silver soldered.

If you pay attention to this points there should be no problem of leaking or exploding.

Very good finished gas tanks you can get also from Regner in Aurach.

regards

Tom

[Vin]

If you view John Hemmens website be aware that It does not respond to Fire Fox as a web browser.  Like several other sites, the web designer assumes that you will be using internex explorer.  Pity really.
Vin

[boilertester]

Hi Derek
Brass is fine for commercial tanks, Nickel silver is tolerated, but for home made tanks only copper is acceptable in the UK and are usually made of 16g or 1.5mm thick material, other countries may be different and people need to check with there governing bodies, in the UK these are 'The Southern Federation of Model Engineering Societies, Northern Association of Model Engineers and Model Power Boat Association'.

Cheers
Paul R
Boilertester

[steamboatmodel]

I think the important part is the hydrostatic test, as noted in the photo 375psi, and the butane propane mix.
Regards,
Gerald

[derekwarner_decoy]

Hi PD's...... ......we must question the text & % in my Gas Certificate below & I wonder if the original grammer was courtesy of that Willie Shakeshpere?

Propane not to exceed 30%
Butane not lower than 70%

I don't understand how either of the requirements.....could vary from the given when read as %' áges...but then I am of First Fleet convict stock  ..........& we didn't have trig tables....slide rules or calculators in 1880's on our luxury cruise  to OZ ........Derek .....

[steamboatmodel]

Hi Derek,
I have seen and used cans with the following mixes:
Propane 30%
Butane  70%

Propane 20%
Butane  80%

Propane 25%
Butane  75%

Propane 15%
Butane  85%

Propane 40%
Butane  60%

The first four could be used with your container, the last one would be a no no.
Regards,
Gerald
PS I have just looked and the only ones I currently am using are ;
Propane 30%
Butane  70%

Butane 100%

[derekwarner_decoy]

  PD's & thanks Gerald....I have purchased disposable gas cannisters from K Mart, Bunnings, & also priced them @ a large Sporting gear wharehouse.......& the only offering was the 70/30 ratio

The cans from Bunnings are Australian produced & cost x TEN fold of the Korean produced examples from K Mart........I had no idea any other ratio existed.............Derek 

[andy]

Hi,

outside of the gas tank discussion:

Is here somebody who can give me an information for a good and hot gas burner for the soldered (inox parts were melted together, no silver, no tin, I do not know the right word) inox boiler of my model? Because the engine and the boiler flaming tube are so near together, I need a burner very short for gas (butane/propane). The tube for the gas to the burner needs a 90 °fitting at the burner. What´s available on the market?

light, short, hot, uncomplicated, intelligent?  (no girl)   :-)

Andy

[kno3]

Did you try http://www.dampfmodellbau-keifler.de/ ?
He makes custom tanks and ceramic burners too, so just send him the dimensions you need.

[andy]

No, I did not know this link, seems good! But has not what I need.

Some other links?

Andy

[kno3]

Sorry, don't know others. But try asking him if he can make what you need. He makes custom parts too.