Propylene

[dannyp]

anyone used propylene much ?

whats it like to use and is it any good ?

 

[wristpin]

anyone used propylene much ?

whats it like to use and is it any good ?

Short answers to your questions are don't know, and don't know!
What on earth do you want to do with it? Googled it and it appears to be be some sort of hydro carbon base product used in plastics and pharmaceuticals amongst other things.
Are you sure that you've got the right word?

 

[dannyp]

It's a fuel gas alternative to acetaline apparently

what i've been told you can weld with it as well as brazing and cutting. appaently works better than propane for brazeing and cutting, will weld steel but need a bigger torch as not quite the heat of acetaline.

so sort of a half way house between propane and acetaline. we've been presented with a bottel of it to pllay with at work just wondering what to expect from it

 

[Bsmith]

we've been presented with a bottel of it to pllay with at work just wondering what to expect from it

If your going to play with it, expect the worst from it.

Sorry, I never heard of it before.

 

[stef1]

I think what you are referring to is map gas, which contains propyne?

I'm not to clued up on gases but I use map pro gas for plumbing, much hotter than propane but expensive

 

[shenion]

MAPP gas is popular here.

IT is hotter than propane/butane, almost as hot as acetylene.

The issue with it is the flame is backwards. The outer flame is hotter than the center. This makes it difficult for welding and you don't get a focused inner flame with an oxidizing shield.

I have an adapter to use MAPP gas on my torch to use disposable bottles (Steak saver). Have not used it yet as O/P has been good enough.

 

[hotrodder]

Blimey, i thought my spelling sucked

I thought 'real' MAPP gas production stopped some years back although there's various other blends with similar names that do a similar thing i.e. 'hotter' than propane. Hotter with regards to flame temp is a red herring... pretty much any flavour of oxy fuel is hot enough to melt steel, as said the issue is heat energy (specifically where the heat is produced in the flame) and flame chemistry. I know the link is about cutting but it includes stuff on flame chemistry, mixtures and heat distrubtion within the flame... http://www.twi.co.uk/technical-knowledge/job-knowledge/oxyfuel-cutting-process-and-fuel-gases-049/

I've welded thin sheet using oxy 'MAPP' and while doable it's not even close to acetylene. Propylene wouldn't fix things from an oxidising POV and, on paper at least, would be worse with regards to heat from the secondary/outer flame. Cutting, brazing, heating... similar trade offs to any of the other acetylene alternatives, save money on fuel gas but go through O2 more quickly while swings and roundabouts performance wise depending on the type of work

 

[FranV8]

Is propylene safer though? That would be a bonus.

I'm thinking storage wise?

 

[shenion]

Yes, that is why I never had my acetylene tank filled. Propane and MAPP gas does not have the instability under pressure.

 

[Jim Davey]

Propane has its own problems though, heavier than air so leaks can pool in pits or drains such as found in garages.
There's nothing inherently wrong with acetylene, it just needs handling with the respect it deserves.

 

[rtbcomp]

Definition of propylene fuel gas here

http://www.linde-gas.com/en/products_and_supply/gases_fuel/propylene.html

 

[dannyp]

yes my spelling sucks,

so best we can hope for is it's better than propane for cutting and brazeing but we are really going to miss acetaline. but no ones used it much.

well we'll soon know once the current bottel of acetaline is done because there isn't going to be any more of it

 

[brightspark]

Propane has its own problems though, heavier than air so leaks can pool in pits or drains such as found in garages.
There's nothing inherently wrong with acetylene, it just needs handling with the respect it deserves.

tell me about it. i had a full bottle of propane leak and it ended up in my pit was a week before i noticed fortunately i picked something up of the floor and smelt it before i used anything that would ignite it . a good lesson learnt

 

[dannyp]

propylene now been played with

goes better than propane, dosent go as well as acetaline but it says that on the tin, dose everything else it says on the tin.

 

[hotrodder]

Hows the price compare to propane vs acetylene?

As Jim i don't get why acetylene gets singled out as 'dangerous' or for that matter why the fuel gas is always the one talked about. Fuel gases are usually stenched unlike O2 (also heavier than air) and things that are generally considered non flammable/difficult to ignite can burn VERY well with just a few extra % O2 in the atmosphere for a start. Oxy fuel of any flavour = potential bomb, RTFM and treat with respect [/rant]

 

[dannyp]

RTFQ

i was orignaly asking if anyone had experiance of useing it for any tips with what to expect from it.

god knows why your all going on about what potential safety issues there are or arn't with it. no where did i mention i was a pussy and scared of aOA, been useing OA for years without issue as well as oxy propane. and reason for change is nothing to do with with "safety" ether

reason for the question was because of a change in gas supplyer, new supplyer won't do acetaline but offerd propelyne as an alternative

 

[brightspark]

RTFQ

i was orignaly asking if anyone had experiance of useing it for any tips with what to expect from it.

god knows why your all going on about what potential safety issues there are or arn't with it. no where did i mention i was a pussy and scared of aOA, been useing OA for years without issue as well as oxy propane. and reason for change is nothing to do with with "safety" ether

reason for the question was because of a change in gas supplyer, new supplyer won't do acetaline but offerd propelyne as an alternative

have u noticed anything about the people that go on the most about acetylene been dangerous are the people who havent got it

 

[dannyp]

good point well put,

think the ideal solution is going to be getting another gas set, keep one OA just get the acetylene from a diffrent supplyer and set the other up on oxy propane for general scorching duities.

will see how the proplyne lasts compared to OA and OP and see if it seems expensive

 

[tiger99]

MAPP gas, and its replacement, which contains propylene, are a very poor substitute for acetylene, and ought never to be used for any form of structural welding, as the excess hydrogen in the flame will cause severe hydrogen embrittlement in steel and other susceptible metals.

 

[DIYNUT]

To second tiger99's comment. As far as I can tell there isn't really an alternative to acetlyene for welding. I did read the the american plant producing MAPP gas has stopped producing it and that the alternatives were using propylene.