Oily substance in LPG line
10-08-2008, 02:18 PM, (This post was last modified: 10-08-2008, 02:20 PM by sutech.)
#1
Oily substance in LPG line
Dear All

We faced new problem in our testing step, when we are starting the gun, an oily substance is produced in LPG lines that comes into flowmeters and if we continue this condition, this oily material flows with the gas, out of the barrel of the gun. This makes some serious problems with ignition mechanisms and combustion of the gas mixture and flowmeters. We use a heating belt around our LPG cylinders and a vaporizer for vaporizing liquid gas and pressurizing the the gas flow.
Would you please help us about this problem and give guidance how to solve that?

With Best Regards
Reply
10-09-2008, 02:47 AM,
#2
RE: Oily substance in LPG line
Hi Sutech

A couple questions to gather more information:

1. What process are you using? HVOF, Flame?
2. What equipment?
3. What country?
4. What is the LPG composition, it could be 50/50 propane butane

Please note that in most countries LPG is a home use gas used for cooking, not industrial quality gas, and the standard mix can vary from time to time. The vapor pressure of Butane is far, far lower than that of Propane.

I would strongly recommend switching gases to an Industrial Grade of Propane. I imagine you are using LPG since it is relatively inexpensive compared to Propane, subsidized? Better off with a quality gas. Believe me, been there and done that....
Stephen James Booth
www.ipsteknokraft.com
www.teknokraft.com
Indonesia WhatsApp +6281905603262

Reply
10-10-2008, 12:58 AM,
#3
RE: Oily substance in LPG line
(10-08-2008, 02:18 PM)sutech Wrote: Dear All

We faced new problem in our testing step, when we are starting the gun, an oily substance is produced in LPG lines that comes into flowmeters and if we continue this condition, this oily material flows with the gas, out of the barrel of the gun. This makes some serious problems with ignition mechanisms and combustion of the gas mixture and flowmeters. We use a heating belt around our LPG cylinders and a vaporizer for vaporizing liquid gas and pressurizing the the gas flow.
Would you please help us about this problem and give guidance how to solve that?

With Best Regards

What temp on the belt? Above 75*F?
I just saw a fuel flowmeter that looked like a faucet when the propane was turned on. Could get some out, but the rest looked like a slightly white greasy looking substance that is never going to come out unless you take out and clean the flowtube.
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10-10-2008, 11:11 AM, (This post was last modified: 10-10-2008, 11:37 AM by sutech.)
#4
RE: Oily substance in LPG line
Hi Stephen,
Hi Intel55,

process is HVOF that we have ourselves designed and made the gun (look at "Valve Opening procedure" from sutech in this forum)
The belt temperature is much higher than 75 F, it is 158-176 F, and the LPG we use as fuel is domestic LPG with not certainly known composition, the propane percent varies between 50% to 90% depended on season
This oily substance is sticky and yellowish and it appears after vaporizer or where leakage occurs in hoses and pipelines

With Best Regards
Reply
10-10-2008, 06:54 PM,
#5
RE: Oily substance in LPG line
Hi Sutech

As already said by Stephen, I think you need to switch to a purer industrial grade propane. Even without the problem of contaminants, how can you rely on getting consistent spraying results with a fuel that can vary so much in composition.
Reply




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