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Comandante

vinyl tubing pressure and LPG cylinder

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Hey all,

I'm trying to attach a Bunsen burner to an LP gas cylinder but I have problems finding the right adaptor and tubing for the cylinder. I have a piece of vinyl tubing of ~1.5mm wall width and I'm wondering if anyone knows how to calculate the maximum internal pressure that this tubing can withstand.

 

I know the LPG cylinder is ~3.3MPa when full and it just looks to me like this tubing would not hold it so I don't want to try it just yet, would like some numbers.

 

Any ideas?

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apparently the 3mm standard rubber tubing is suitable for use. i have some 2mm spare will try it when i get adaptor for the cylinder. will post how it went.

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Unless the burner is designed to deal with gas at 3.3 MPa then this is, at best, not going to work.

Most of the Bunsens I have seen are designed to work with about 200 mmH2O (A seriously non SI unit) equivalent to 2.5 KPa i.e. a thousand times less gas.

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That's what I would've expected. This burner is labelled as designed for LPG though, and from all the cylinders I inspected at the hardware store all were are at 3.3MPa, seemed like it's a standard. I'll go check out another store on Monday, they better have something suitable...

 

Btw, this is the burner I have; http://cgi.ebay.com.au/LH0050-LPG-Bunsen-Burner-Slide-Collar-LPG-NEW_W0QQitemZ330422422011QQcmdZViewItemQQptZAU_Business_Industrial_Medical_Scientific_Equipment2?hash=item4ceeb609fb#ht_500wt_1182

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That's what I would've expected. This burner is labelled as designed for LPG though, and from all the cylinders I inspected at the hardware store all were are at 3.3MPa, seemed like it's a standard. I'll go check out another store on Monday, they better have something suitable...

 

Btw, this is the burner I have; http://cgi.ebay.com.au/LH0050-LPG-Bunsen-Burner-Slide-Collar-LPG-NEW_W0QQitemZ330422422011QQcmdZViewItemQQptZAU_Business_Industrial_Medical_Scientific_Equipment2?hash=item4ceeb609fb#ht_500wt_1182

 

 

Seriously, it needs a regulator, it is not designed to use full pressure from the cylinder, any gas grill regulator should work. Find an old gas grill and take the regulator from it, i see them in the trash all the time.

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I figured as much from John's numbers, that's what I meant by something suitable :) But for some reason I suspect they won't have it, wouldn't be the first time these undersupplied hardware stores fail to provide. In that case I may have to look through the trash you mentioned :)

 

Oh by the way, I found 2 online, but I'm not sure which one would be better, what do you think:

this: http://cgi.ebay.com.au/2-75kpA-LPG-Regulator-Low-Pressure_W0QQitemZ320482001284QQcmdZViewItemQQptZAU_Barware?hash=item4a9e374184#ht_842wt_939

 

or this: http://cgi.ebay.com.au/Variable-Pressure-LPG-Regulator_W0QQitemZ320482002623QQcmdZViewItemQQptZAU_Barware?hash=item4a9e3746bf#ht_807wt_939

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