CNG treated gas..

[asurin]

Hi, anyone try using this Cng treated instead of propane.., wondering whether suitable as the price more afforable in long run... advise needed..


Appearance: Colourless Gas
Odour: Pungent Odour – Mercaptan Mixture (added)
Burning Temperature: >3000 °C
Auto ignition temperature: > 550 °C
Flammable Limit LEL = 4.5% Vol
Flash Point: 184°C
Vapour Density 0.80kg/m3 @ 760 mm Hg

http://www.airngas.com/prod_treatedgas.html

[Alaska]

There are a number of folks that use NG plus oxygen for their torches. Works fine.

Would assume that CNG is the same as NG only compressed. Thus there should be no difference in performance.

The plus part with CNG is that one could obtain a higher torch gas operating pressure. Home NG pressures are in the range of .3 to .5 psi. i.e. 7 to 11 WC Using NG at 5 psi would be an advantage and would be dependent on local codes.

[asurin]

great info thanks gonna try it out :)

There are a number of folks that use NG plus oxygen for their torches. Works fine.

Would assume that CNG is the same as NG only compressed. Thus there should be no difference in performance.

The plus part with CNG is that one could obtain a higher torch gas operating pressure. Home NG pressures are in the range of .3 to .5 psi. i.e. 7 to 11 WC Using NG at 5 psi would be an advantage and would be dependent on local codes.

[Alaska]

The negative part is that they cylinders are heavy. And the cost of renting or buying the cylinders would be an additional consideration. However, it sounds like you have a nearby source.

Check with your local welding supply firm to see what kind of regulator is needed to reduce the 2000 plus psi to your operating range of say 5 to 10 psi.

Maybe the tanks are threaded to fit one of the standard welding regulators. But they should know what will work for your needs. Or if used in vehicles, in your area, then that would be another option for the needed regulator.

Use a GTT Scorpion with NG and three 10 psi at 5 lpm concentrators. However, limited to 7 WC or about .3 psi. Using this setup with boro with excellent results.

Please posted your findings....

[Dale M.]

Tank Connector should be same CGA 510 as propane/acetylene/propylene/MAP-PRO/ etc: (many other fuel gases)...

CNG appears to be NG treated with other "hydrocarbon elements" to increase burning temperature... Sort of like propane with chemtain [or is it chemoline] (hydrocarbon) additive...

Its flame temperature is about equal to Propane - 2900° C.

At some point the added hydrocarbons may have adverse effect on torch, as it may not be as clean as propane ... Anything spiced up for welding world may not be as clean burning as for welding and cutting "clean flame" (carbon wise) is not always a important factor.

Also practicality of this as a fuel may also be effected by geography (location) and practicality of obtaining it vs, propane...

As as Alaska states what regulator.... Most fuel regulators only deal with about 200 psi on tank side ...

Dale

[asurin]

love this forum... get to learn new thing everyday

[silverlilly1]

I'd like to know what is meant by "treated" in this instance. Do they just mean odorized? Because all gas going to peoples' homes/businesses by pipe is odorized for safety (you can smell it if there's a leak). I noticed the mention of mercaptan, which is the odorant used in natural gas.

If it's the same chemically as regular NG service, then there should be no issue with the material, but by pipe is more convenient than compressed in a tank, if you can get it.

[Dale M.]

"Treated" means certain hydrocarbon chemicals have been added to increase the BTU output (combustion temperature)....

In this case major ingredient is methane (nature gas) with ethane and other hydrocarbons according to web site... Ethane is a hydrogen rich molecular structure compared to Methane

http://en.wikipedia.org/wiki/Ethane

http://en.wikipedia.org/wiki/Methane

Dale

[silverlilly1]

Natural gas, as sold across North America, is primarily methane and ethane, with smaller amounts of "natural gas liquids" (propane, butane, pentane...). So that would appear to be normal natural gas to me, unless there is something else in it, besides odorant.