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Author Topic: Some propane data/green gas  (Read 1657 times)

Offline busta_cap

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Some propane data/green gas
« on: November 06, 2009, 05:46:26 PM »
So, whether you want to believe it or not, it has been pretty well documented(or from what some great sources have informed) that green has IS propane..why doesn't it smell like propane? Well that is because any propane you find for sale will already have the odor additive in it..

So why does my GBB or Gas powered gun shoot so radically ? IE: bad in cold weather, really hot in hot weather!?
Vapor Pressure at 0°F     28 PSI
Vapor Pressure at 70° F    122 PSI
Vapor Pressure at 100° F    190 PSI

As you can see...this is why! I got this info off of Amerigas' website by the way, So i am pretty confident that it is good info.

This is the main reason why the cooldown effect IS REAL and does effect your gun's performance..Now on the contrary...the amount of pressure required to actually operate your GBB/NBB at it's full potential may or may not be effected by the 'cooldown effect'. Although I cannot remember the mathematical equation to solve the temperature to psi % increase/decrease, you can see from the above data that the hotter it gets, the quicker the propane pressure increases.

Just some info for you guys.. And the reason why I am even getting into this is because of the obvious safety concern with green gas bottles..and also that I am building a custom HPA rig..which is actually really cheap to do.
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Offline Vince

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Re: Some propane data/green gas
« Reply #1 on: November 06, 2009, 05:48:38 PM »
Welcome to 2007.

Let me know if you need any advice on HPA plumbing and regulator choices.

Or...just go here : http://www.classicairsoft.org/forum/vie ... =79&t=9267
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Offline busta_cap

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Re: Some propane data/green gas
« Reply #2 on: November 06, 2009, 05:54:45 PM »
Quote from: "Vince"
Welcome to 2007.

Let me know if you need any advice on HPA plumbing and regulator choices.

Or...just go here : http://www.classicairsoft.org/forum/vie ... =79&t=9267
Definately! Ron and Matt said you knew alot. Was it the m700 you did that to?
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Offline Vince

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Re: Some propane data/green gas
« Reply #3 on: November 06, 2009, 05:57:47 PM »
Quote from: "busta_cap"
Quote from: "Vince"
Welcome to 2007.

Let me know if you need any advice on HPA plumbing and regulator choices.

Or...just go here : http://www.classicairsoft.org/forum/vie ... =79&t=9267
Definately! Ron and Matt said you knew alot. Was it the m700 you did that to?

I have a lot of gas guns.

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"I was having dinner with Andrew Ho, and he said I should have COL McKnight lead airsofters in mock combat. I said, "That is the gayest idea I have ever heard." - John Lu

Offline busta_cap

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Re: Some propane data/green gas
« Reply #4 on: November 06, 2009, 05:59:47 PM »
So are you running c02 in this case? looked around that short thread and it looks like that's a setup for powerlet/c02
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Offline Vince

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Re: Some propane data/green gas
« Reply #5 on: November 06, 2009, 06:02:07 PM »
CO2 and HPA have the same fittings and same infrastructure requirements. As long as your regulators aren't shit, you should be able to run CO2 and Nitro.

I have 4 CO2 tanks and 1 HPA tank. The HPA tank is for when it is cold, and even then, only until it gets up around 60 or so.

The idea is that you run the primary regulator really high, like 200-250 PSI, and then fine tune your line pressure with your secondary regulator, down to about 120 (steel Escort guns), 100 (brass Escort guns), 80 (BVs), or 40-70 (Tanaka/KJW gas bolt guns).
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Offline busta_cap

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Re: Some propane data/green gas
« Reply #6 on: November 06, 2009, 06:05:29 PM »
Quote from: "Vince"
CO2 and HPA have the same fittings and same infrastructure requirements. As long as your regulators aren't s***, you should be able to run CO2 and Nitro.

I have 4 CO2 tanks and 1 HPA tank. The HPA tank is for when it is cold, and even then, only until it gets up around 60 or so.
Well I was planning on running the HPA, more so because I think you should be able to get more out of the same CI of tank space.. I guess the cooldown effect with c02 is not going to matter because the c02 is around 600-800psi at room temp and upwards of 1500 at 100*... What is the normal operating PSI of your gun's? Have you seen significant consistencies ?
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Offline Vince

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Re: Some propane data/green gas
« Reply #7 on: November 06, 2009, 06:08:55 PM »
Well, the idea behind the dual regulator setup is that you have a very high line pressure (relatively) behind your secondary regulator so that it would be hard to shoot down your line's pressure. It's possible to get your tank too cold with a ton of F/A but it works fine for me. The problem you run into is that you freeze your regulator up (the temperature is a byproduct of the phase shift, the evaporation).

I run my HK416 at 120 PSI, but it has full steel internals.

I run my MP5 at 110 PSI, but it has a high rate spring and a steel airswitch.
« Last Edit: November 06, 2009, 06:10:37 PM by Vince »
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Offline busta_cap

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Re: Some propane data/green gas
« Reply #8 on: November 06, 2009, 06:09:51 PM »
Quote from: "Vince"
CO2 and HPA have the same fittings and same infrastructure requirements. As long as your regulators aren't s***, you should be able to run CO2 and Nitro.

I have 4 CO2 tanks and 1 HPA tank. The HPA tank is for when it is cold, and even then, only until it gets up around 60 or so.

The idea is that you run the primary regulator really high, like 200-250 PSI, and then fine tune your line pressure with your secondary regulator, down to about 120 (steel Escort guns), 100 (brass Escort guns), 80 (BVs), or 40-70 (Tanaka/KJW gas bolt guns).

Er, didn't see the last line of shit. yeah that was what my plan was set on already. The C02 and HPA tanks are just NCO CW threads right? And it looks like you are using macroline, correct?
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Offline Vince

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Re: Some propane data/green gas
« Reply #9 on: November 06, 2009, 06:11:03 PM »
I have no fucking idea, just read the PDF. The regulator is a paintball regulator, you use a paintball CO2 tank.
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Offline busta_cap

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Re: Some propane data/green gas
« Reply #10 on: November 06, 2009, 06:22:22 PM »
Quote from: "Vince"
I have no fucking idea, just read the PDF. The regulator is a paintball regulator, you use a paintball CO2 tank.
This was also an interesting find...

http://www.lowes.com/lowes/lkn?action=productDetail&productId=166441-61735-J-6901-100&lpage=none

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Offline Vince

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Re: Some propane data/green gas
« Reply #11 on: November 06, 2009, 06:25:02 PM »
Total piece of shit.

There's only so many ways to draw a box.

Mine has the cleanest lines and rightest angles.

The regulator head is also not very man portable. It's like, the size of a softball.
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Offline busta_cap

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Re: Some propane data/green gas
« Reply #12 on: November 06, 2009, 06:27:30 PM »
Quote from: "Vince"
Total piece of s***.

There's only so many ways to draw a box.

Mine has the cleanest lines and rightest angles.

The regulator head is also not very man portable. It's like, the size of a softball.
Indeed, I checked it out in person and decided against it..I am gonna have to check out your rig that sounds like the best way to go...I think in this quest it has made me want a GBB primary as well..Seems like a more realistic approach ..besides the tube hanging off the gun..
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Offline Vince

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Re: Some propane data/green gas
« Reply #13 on: November 06, 2009, 06:30:29 PM »
It's really just an exercise in recording all this information for posterity I suppose - you won't actually buy any of this stuff, right?
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Offline busta_cap

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Re: Some propane data/green gas
« Reply #14 on: November 06, 2009, 06:39:02 PM »
Quote from: "Vince"
It's really just an exercise in recording all this information for posterity I suppose - you won't actually buy any of this stuff, right?
Your sarcasm isn't appreciated, but no...I just bought an m700, scope, bi-pod, tight bore,etc yesterday..so if you are asking If I am serious then yes...I want consistency..
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