MadMax
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Posts posted by MadMax
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Well thanks for the link.
But volume may change with temperature and pressure.
Well I have a bottle of 1000ml of ultrair, smaller than a 800ml HFC green gas one
Anyway, do you know a canadian retailer shipping Coleman or Bernzomatic to France ?
Cheers.
Well, you print the volume of a containers contents in the sold state. A can of pop contains 341mL even though the gas dissolved in the pop expands past the initial volume of 341mL. 1000mL has nothing to do with the contents of green gas cans. It's an arbitrary value slapped on. The contents of GG cans is not equal to 1000mL inside the can and it expands well past 1000mL if you inflate a bag with it.
Sorry, I don't know of any retaillers of propane who ship to France.
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Hi everyone.
Does anyone know a reliable shop in the UK willing to ship propane to France.
Cause at mjtcontrols, propane seems to be expensive. As we can get a 1 liter bottle of ultrair for only 10€, here in France.
The site says "PROPANE CYLINDER 14.1oz", I managed to find it's nearly 400ml. Am I right ?
Thanks.
400g = 14.1oz
Green gas cans are marked with 1000mL which is pretty bogus. I posted on another forum about this awhile ago:
http://www.airsoftcanada.com/showthread.ph...ht=taiwanese+mL
I later weighed the difference between new and empty GG cans and found that cans contain around 270g of propane which is significantly less than the 400g (bernzomatic cans) or 465g (coleman brand) fill mass in fuel propane tanks.
Even if you don't believe the weight difference results, measure the exterior dimensions of a green gas can and you'll find that they can't even contain 1000mL of volume. You can weigh the difference between full and empty cans with a digital scale. If you don't have one, bring your cans to a post office or even a grocery store and borrow theirs for a minute.
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Whats the WA Desart Eagle like and any chance of some pictures of it please?
I can't say I really know. I got the gun in nearly perfect condition, but it didn't come with a mag. The gun was thrown in as a deal sweetener for a much larger deal so I knew it didn't come with a mag.
Finish is pretty good. It's still a bigass hunk of plastic. Even if it had a mag, I don't think I'd play it. Huge size isn't really come with commensurate battle worthiness.
The PKII with grenade makes ppl duck when I have to pull out my secondary.
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I call it "Reason". Nobody likes to argue with Reason.
Mounted MM165bb grenade with modified pull trigger. Custom trigger components connect to pull trigger instead of the usual push plate. If someone annoys me, I give them the middle finger.
A square Guarder RDS helps me point it the right way.
Some of my WA collection on a prototype cardboard pistol rack. Second try on the rack is a lot better. A couple of these guns have been sold and replaced with some of the new hotness SCW line.
From left to right on the rear view pic:
-SVI 3.9" two tone
-MGC1991 (Not WA, but licensed by WA)
-5" Xcellerator (test platform for flow restrictor development)
-PKII 3.9" (one of two in my collection)
-6" SVI
-WA DEagle
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Well, it is nice to know the world is full of these really safe containers.
Perhaps it is a stretch to call the mislabeled thin metal 'green gas' cans unsafe. But, I still don't understand parts of this whole thing, something does not fit together.
I am left with a question: Why would Coleman bother with those expensive 500 psi containers for propane if it were not required by law?
-WMH
Regulations require that pressure vessels be overengineered for the contents that they store for a few reasons:
-containers should handle some degree of forseeable abuse (dropping onto sharp cornered objects, slight crushing)
-containers should not overpressurize and explode under plausable circumstances (e.g. forgotten in/on a car on a hot summer day)
Coleman IS required to provide significantly overengineered pressure vessels because they are consumer items which are widely distributed. Consumer goods are expected to not be a threat to the public in case of shipping accidents or plausible common abuse.
If items can be made affordably failsafe they should be.
Propane butane blend exerts around 50psi (compared to 125psig for pure propane). So you can't really justify the use of impact extruded aluminum for pure propane storage. I have seen one disposable rolled steel can which is DOT recognized for propane storage. It is stronger than an impact extruded can and has a blowout failsafe mark on the bottom identical to this can of airbrush propellant (it's actually R22 sold before the ban on aerosol R22)
http://www.pbase.com/airsoft_innovations/image/30701421
I don't know if impact extruded aluminum cans (2 piece) are more common in the UK, but it seems that rolled and seam welded steel cans are a lot more popular in North America. I think they fail in a schrapnel free manner because the crimp on top is designed to leak before the can sides blow out.
CO2 caplets (12g type) are failsafe. If you throw them in a fire, the braze on puncture disc on the top comes off before the contents heat and explode the caplet sides. You probably get a really noisy shrieking bottle rocket, but at least it's a hemispherical blunt one that doesn't move as fast as a steel fragment.
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Thanks for a well photographed and well researched review Arnie!
Good range of guns tested on the chrony too. I'm impressed with the consistency of the KSC USP.
As to exploding cans, proper propane cans are a very safe design. Instead of exploding, their relief valve farts out a bit of propane. It's better not to overheat a tank in the first place, but a leak is certainly safer than an outright explosion.
If I remember right tank valves are set to relieve when the tank exceeds 250psi (corresponds to about 125F or 52C). This pressure is called the "test pressure".
If you're interested in reading more about the regulations applied to the design of Coleman and Bernomatic (rated DOT-39) cylinders:
http://www.setonresourcecenter.com/49CFR/D...0a/wcd00aee.asp
Possibly the most pertinent bit from that document is a about failure testing:
(2) One cylinder taken from the beginning of each lot, and one from each 1,000 or less successively produced within the lot thereafter, must be hydrostatically tested to destruction. The entire lot must be rejected (see paragraph (h) of this section) if:
(i) A failure occurs at a gage pressure less than 2.0 times the test pressure;
(ii) A failure initiates in a braze or a weld or the heat affected zone thereof;
(iii) A failure is other than in the sidewall of a cylinder longitudinal with its long axis; or
(iv) In a sphere, a failure occurs in any opening, reinforcement, or at a point of attachment.
If I read the specs on my can right, the test pressure on it is rated at 250psi which makes for a minimum burst pressure of 500psi. This corresponds to a temperature well over 160F/70C (my propane data table only goes to 160F).
Airsoft Innovations Propane Adapter
in Review comments
Posted
gah. Delays after delays. I think production should start tommorow and take a couple days.
then I have to hound my webmaster into helping me get them onto the site. I may be putting together my own website addition in the interim which will be a decided break from the usual look of my site. My work is significantly kludgier looking than my webmasters work.
Old dog new algerbra problem. I can gnaw stuff out of metal and plastic, but the last time I tried to machine a webpage, things went funny.