Questions about torch gas and oxygen psi?
Hello,
This question could be applied to any glass torch out there but, I’m going to use the Bethlehem Barracuda as an example because it is the torch I got setup right now. The recommended GAS is 3-5 psi and the OXYGEN is 10-20 psi. So my question is if I have my Barracuda torch setup to one of the following settings below, what would the difference or advantage between the settings be? How does this affect how the torch works or is used? GAS – 3 psi OXYGEN – 10 psi Or GAS – 5 psi OXYGEN – 15-20 psi Robert |
Well, Robert, I see no one has attempted to answer your question, so I guess I will jump in here with my opinion/assumption. The only difference in 3/10 vs. 5/15 would be the ultimate output of the torch, were you to use it full open. Since most of us do not normally operate our torches full open, I doubt you would see much difference.
|
Pam is right because it is the needle valves that control the flow. A higher pressure will make your valve control more touchy. And a difference of just a couple of pounds would be hardly noticeable.
|
These Barracuda torch settings are recommended and were posted on bethlehems website.
GAS – 3 psi OXYGEN – 10 psi Or GAS – 5 psi OXYGEN – 20 psi So the only difference between the low end of the settings (gas-3 / oxygen- 10) and the high end of the settings (gas-5 / oxygen-20) is that more volume of output used with the torches needle valves full open? Also with higher pressure settings would make the needle valves touchier because more volume would be going through the valve with even the smallest turn? Then the only other question I would have is why would anyone want to setup there Barracuda with Bethlehem’s recommended torch setting at the high end of their psi when there would be no difference except touchier control valves and more volume used if you have your torch full open? |
Robert,
You would use the higher pressure settings so you could get more heat out of your torch--for example, I often use the higher pressure settings when I work boro. If you were making boro marbles, pendants, or anything sizeable it takes much less time when you have more gas pressure/fuel available. If you're working soft glass, you would definitely use the lower of the recommended pressures. Anita www.fireflybeads.com |
It is always best to have your regulators set on the highest pressure recommended, regardless of the glass you are using. That way you will have the gas (fuel/oxygen) there when you need it. Your needle valves control the flow. If you have your pressures set high, you can always control the flow through your valves and have as little or as much fuel or oxygen go to your torch as you need.
Here is an example of why you should not set up on the low end: Say you are making a marble. You set out to make it one size, but it starts getting bigger than you anticipated. You need more heat. Now, if you are already set to the maximum pressures, you just turn up the heat by using your needle valves. But, if you were set up on the low end, you will have to go change the settings on your regulators to allow more fuel and oxygen to get to your torch. There are many reasons why you would need higher pressures:
So, what I am trying to say is that you can never use less. You might as well start off with the highest recommended pressures given by the manufacturer. The only torch I know of where you really need to change the regulator settings to get certain effects/colors out of glass is the Herbert Arnold. It has a single control knob and in order to finesse the torch, you adjust the pressures with in-line regulators (you could adjust them at the tank, but lots of guys put additional in-line regulators right at the torch so they don't have to run back and forth). You do not need to run different pressures for different types of glass because you control the mixture and the amount of fuel and oxygen with your needle valves. Running low pressures for working soft glass is not only unnecessary, in the case with some torches, it will carbon them up pretty quickly. It is better to run them at the highest pressures you have available to you (within the manufacturers recommendation - do not exceed their valve tolerances) and to control the flow with your needle valves. Oh, and when you set your pressures at the regulators, make sure that you go back and adjust them while your torch is running. If you just set your pressures, and then go to the torch and start working, the pressure will actually drop lower than what you set. So, you need to set your pressures, go light the torch, and while the torch is running, go back to the regulators and adjust them to the proper setting. |
You can use the low end setting and get a more gentle flame. Fuel is not not rushing out due to high pressure pushing it. Anytime you up the pressure, it's got more push and will move more gas through the torch, regarless of needle settings. It all depends on your working style. Some soft glass artists like a softer flame. For boro, I like a fast flame. I want the push and maximum heat. This is exactly why I like the Beths for a cross over torch. It can do both very well. ;)
|
"Anytime you up the pressure, it's got more push and will move more gas through the torch, regarless of needle settings."
When you increase the pressure at the regulator, you increase the amount of gas available to your torch. Your needle valves are what regulate how much gas actually gets to the torch from the lines. I'll use oxygen pressure (from a tank) as an example - it works the same for fuel, as well. The numbers are just for demonstration purposes. Say you have 20 psi coming out of the oxygen tank and through the line (this is what Bethlehem recommends for the high end pressure), once it hits a closed valve, it stops and no oxygen is getting through the torch. If you crack open the valve (say 1/16 of a turn for example), you are only getting so much of the oxygen through to the torch. If you open the valve all the way, you are getting all of the recommended oxygen to the torch and can get everything out of that torch. When you have higher pressure in the line, you turn the valve in smaller increments to increase or decrease the amount of oxygen coming into the torch. Your control is touchier, but you have a broader range. You can go from completely closed getting no oxygen to completely open getting as much oxygen as the manufacturer recommends - the full 20 psi - and everything in between. Now, say you set the pressure to 10 psi. When the needle valve is closed, there is no oxygen getting to your torch. When it is cracked open (say that 1/16 of a turn used as an example), there is some oxygen getting through to the torch, but only 1/2 as much as if you were running 20 psi. If you were to open the valve all the way, you would only get as much oxygen as the regulator alllows, and in this example that would be 10 psi, or half of what the manufacturer says you need to get everything out of that torch. You will have to turn your valve in larger increments to increase or decrease the amount of oxygen coming to the torch. Basically, you would have to turn the valve 1/8 of a turn at a regulator setting of 10 psi to get as much oxygen as turning it 1/16 of a turn at a regulator setting of 20 psi. Your control is less touchy, but you have a narrower range. You can go from completely closed getting no oxygen to completely open getting only half the oxygen as the manufacturer recommends at 10 psi and everything in between, but nothing more. Some people like touchy controls. Some people don't. Some people like them for some applications, but not for others. This is where personal preferrance comes in. But, the fact remains that the needle valves do control how much of the gas from the lines gets through the torch. The regulator pressure only dictates the upper limit. PS There are days that I switch from working soft glass to working boro. I work with my pressure set to the highest recommended setting when I'm on a tank. I just turn my valve knobs up more to push more oxygen and propane through my torch. I don't ever get up to change the regulator settings. |
Thanks for everyone’s reply.
I have another question. Do you think something is wrong with my new regulator? I bought a new gas regulator for my propane tank because my old one only had 1 gauge on it that allowed me to set the output psi. I bought a new regulator that has 2 gauges on it one to set the output psi and one that tells me how much propane is left in the tank. Well to day while on the Barracuda I noticed that after setting my propane to 3 psi the gauge needle with go up and down depending on how I adjust the torch flame. For example, with a neutral flame my regulator gauge reads 3 psi. When I change my flame to a micro pin point flame the regulator reads 5 psi, and when I change the flame to a reducing flame the regulator gauge reads almost 0 psi. Is this normal? I thought it might be the Barracuda so I connected my GTT and the regulator goes up and down in psi with how much I open and close the gas valve. Thanks again, Robert |
It is normal for the gauge to do this because you are relieving pressure in the line when you open the propane valve. The higher the pressure setting, the less noticable the swing will be.
|
A better regulator will a hold more stable pressure. Work with it and see what settings work best. Getting new equipment is always an adjustment. I've seen studios operating on pancake regulators... it's all in what you can afford and get used to. :D
The pressure settings on the regulator do dictate the rate at which the fuel flows through the torch. Of course you can adjust the amount of fuel with the needle valve, but at higher pressures, the gas is moving faster. That is how you get a driving flame. If you want a soft flame, the pressure on the low end is best. This elliminates the woosh or high pressure push through the needle valve and allows a softer flame. ;) |
Quote:
I just thought that when you set your gas regulator at X psi it is supposed to always stay at that psi regardless if you have your torch is closed, half open, or wide open. |
Quote:
I'll try to explain it with an analogy. Say you have a water spigot at your house. The water pressure is regulated and set to 40 psi. When you turn open the spigot a little, you get a trickle of water. The water company comes along and increases the water pressure to 80 psi. When you go to crack open the spigot, you do not have to turn it very much for the trickle of water to start coming out. That trickle of water is still just dribbling out the same as it was before. The water is not shooting out of it any faster than it was at the lower pressure. Next, the water company comes along and turns the water pressure down to 20 psi. You have to open the spigot more than normal to get the trickle of water. The trickle is still trickling. It isn't moving in slow motion or anything. You just had to turn the valve more to get it to come out like it did before. Now, if you open the spigot valve all the way, you might feel frustrated because there just isn't enough water coming out. The low water pressure limited how much water could get to the spigot. The valves on a torch work the same way. The valves control the gas that goes to the torch. Once the gas reaches the needle valves, they take over. So, if you want a soft flame, just keep the regulators set where they are and use the valves turned on a little bit (the valves will be very responsive when using higher pressures). Unless, of course, you like to turn your valves further before seeing a response in the flame. Then, by all means, set the regulators to a lower pressure. |
This may be helpful...
http://www.arrowsprings.com/html/tips___tricks.html Open this up and look at the bottom of page 3 (of 14), particularly the last two paragraphs (well one of them is just two sentences long). The Arrow Springs guide is a wealth of information. PS I found the same thing here in the last two paragraphs of the page: http://www.arrowsprings.com/html/con...egulators.html So, you don't have to download the pdf file unless you want to. Here is what it says about pressure settings: Quote:
|
Just try to explain that to those guys who have to be "ragin" their torches with the oxy turned up to 60. Never did understand that. Lack of education in basic physics, who were Venturi and Bernouli anyway?
-Don- |
Kimberly, Thanks again for giving such succinct answers to these questions. I've always known that pressure regulators fluctuate while using them, unless they are two-stage, but never really understood specifically why. I knew vaguely, but now it makes more sense.
|
Quote:
Don, are you going to AGI again this year? I think I remember you saying you were. It will be great seeing you again. I've still got to book my flight. Nothing like procrastination... :D |
Google Venturi Effect and then check out the Bernouli effect.
It's more than I want to discuss as it applies to torches, before coffee. :D |
Quote:
|
Thanks Kim your answers make sense.
So in theory you could set both your gas and oxygen psi to the same at 20 psi. Then your control over you different flame characteristics is controlled buy your torches valves and how much gas or oxygen is let through by opening or closeting your torch valves. |
Quote:
|
Quote:
If your valves are sloppy, you won't have the control to finesse the torch at higher pressures. |
Quote:
You are right that the valves will become touchy... but it's not the only thing happening. ;) |
Quote:
Quote:
What "woosh" sound are you talking about, btw? Quote:
|
Quote:
|
I meant posterity. :D I doubt anybody could profit from your quote...
A simple valve is not the same as a regulator... if it was, by your reasoning... we wouldn't need a "regulator" at all. Just a simple innexpensive valve. Hey, there is already on on the tank... skip the regulator, put a few twists in your hose and let me know how that works out for you. :lol: |
Quote:
What's up with the insults? You've said that my analogy was silly. You implied that I knew nothing about physics when you told me to read some stuff on physics. Now, you are saying that no one could profit from my quote, implying that it is worthless. Well, all knowledge has value - even if it is just the knowledge that something can be done. I have been kind and respectful (to you and everyone else) in my responses to this subject. I have tried to explain things so that they could be understood. Even though you are not yet grasping what I have explained, you don't see me calling you any names or implying anything about your intelligence. |
I grasp what you have said... I am just saying it's too simple of an explanation... and it's not taking more complex properties of gas through a valve into account. I don't think you are grasping what I am saying. It's got everything to do with how increased velocity due to pressure effects the flow of a gas. I told you to read more on Physics in the hopes that you could understand where I am coming from more completely. You are right, knowledge is valuable, but only if it's correct. I think if you look into this a little further than you have, you'll see that there is more here than your simple explanation covers. The pressures you run a torch at are very important. There is certainly a range and every person will find a setting that works best for them and their style... but to say you can adjust everything at the torch and to set it at the highest point in the range is wrong. It's not that simple. ;)
|
Think of it this way...
If you have a high line pressure, the needle valve can adjust the amount of gas going through it. What it does is let a smaller amount of gas pass with a higher velocity. This fast moving gas goes into the Manifold. This highly excited gas is going to move through the torch differently than a slower moving gas. It creates eddies and can create a vortex. This chain reaction does follow the flow through the torch and has an effect of how the torch opperates. All of this can be harnessed by torch design and used to bennefit us. A slower moving gas through the torch can produce a softer gentler flame. Sure, the valve needs to be open further to get the same volume... but the excited state of the gas is different. It's less intense. All torches have an operating range based on these properties... the lower range does have advantages... and that's all I'm trying to get across. ;) |
Quote:
If I put my finger over the hose opening it will still be pushing the same volume at the same psi through a smaller opening and the urine stream will shoot out further and harder? |
All times are GMT -7. The time now is 5:24am. |
Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.