Macroline PSI

[SlartyBartFast]

It won't fit the connectors and is made differently.

Well, DUH! You buy the connectors made for it.

800psi is fine for paintball pressures. But to be safe, there shuld be a burst disk in the LP side to account for the weakest component.

Correctly designed all hydraulic and pneumatic systems have a relief valve or burst disk sized for maximum flow requirements and a pressure of maximum working pressure.

Google
"determine burst disk requirements"
"API RP520"

and more.

Or, go talk to a pressure vessel/system professional. Call Parker. See what they say....

[FallNAngel]

No. Correctly matched line and fittings have matched ratings.

I was saying that in response to someone saying he has 3000psi hose... which is true, most macro fittings can't take 3000psi... Could you match the fittings and line? Sure. Most fittings and hose that you get in a pro shop aren't rated for what we put them through though.

[SlartyBartFast]

I was saying that in response to someone saying he has 3000psi hose... which is true, most macro fittings can't take 3000psi... Could you match the fittings and line? Sure. Most fittings and hose that you get in a pro shop aren't rated for what we put them through though.

Well "DUH"! I see your point though. The "dealers" who've bought lengths of tubing and sell it as "safer" without due dilligence for fittings is being negligent.

If you went to the trouble to source hose/tube you'd have to be incompetent to not get the fittings at the same time.

Anyone selling hose/tube based on it's ratings (and only WP is important) and not warning the purchaser to check the fittings or incorrectly saying the tube is safe because of the BP is a liability lawsuit waiting to happen.

So everyone: check the psi rating of the LP burst disk on your marker. That's what the working pressure rating of all down stream components is supposed to be....

[athomas]

Well, DUH! You buy the connectors made for it.

.

Then it wouldn't be macro line if it doesn't fit macro line connectors.

I do agree with what you are saying though. Most of the time, the buyer is being misled into buying whay they believe to be a safe part rated for the pressures that they are operating at. Most of the time, the operating pressures are just under the burst rating, not the working pressure which puts them at risk of failure more often than not.

[SlartyBartFast]

Then it wouldn't be macro line if it doesn't fit macro line connectors.

Define "macroline". Seems opaintball uses that generic term. Not tube and hose manufacturers.
So, "macroline" from a given manufacturer in a given product line fits the "macroline". fittings from that manufacturer and product line.

I do agree with what you are saying though. Most of the time, the buyer is being misled into buying whay they believe to be a safe part rated for the pressures that they are operating at. Most of the time, the operating pressures are just under the burst rating, not the working pressure which puts them at risk of failure more often than not.

You mean like the fact that the "Pro-connect" was rated for 250psi?

[Muzikman]

You mean like the fact that the "Pro-connect" was rated for 250psi?

I have seen way too many pro-conencts blow over the years. I have three sitting at home that come on guns that I have bought. I take them off and throw them in a box with the macro/micro line fittings that I have taken off guns also.

I only use Parker braided lines and brass fittings (including 6 ball QDs). It might not be pretty, but in the 14 years I have been playing, I have not once had a line blow on me.

I do run Macro line on one gun. My Hurricane has macro line as it's the only thing readily available that will fit. I want someone to make me a hardline for it at some point.

[athomas]

Define "macroline". Seems opaintball uses that generic term. Not tube and hose manufacturers.
So, "macroline" from a given manufacturer in a given product line fits the "macroline". fittings from that manufacturer and product line.

Yes, the term "macroline" seems to be a generic term used in the paintball industry. But it does refer to a specific size tube and fittings, meaning that a hose from manufacturer A will fit a fitting from manufacturer B.

There are several differnt types of tubing on the market that are much more safe than macroline. They have higher ratings and are tougher. They also are more manufacturer specific and more costly. The cost is the main reason they don't become adopted by players. Its quite funny actually. Players will spend $2000.00 on a gun and bottle, and then get cheap and put $10 worth of air line on it instead of spending a higher amount on a product that will actually proply protect him and keep the gun functional.

[jenarelJAM]

12222.22psi.
Would the tank explode? Of course not. The burst disk would/should blow long before it reaches that pressure.

One thing wrong with your calculations chief. PV=nRT has T in Kelvin, not fahrenheit. Okay, so assuming the tank starts at 72 deg fahrenheit, and ends up at 220 degrees fahrenheit.

(72 - 32) x 4/9 + 273 = 290.8K
(220 - 32) x 4/9 +273 = 356.6K

So since V, n, and R are constant (volume, amount[moles] of gas, and gas constant), P1/T1 = P2/T2

4000/290.8 = X/356.6

X = 4905.1 psi

This is assuming that you don't leave your tank filled completely to 4500 psi(starting with 4000 psi), and although it's definately not a good idea, there is nothing really to worry about with less than 5k psi in a 4.5k tank, as soon as you take it home, it will cool off again. It's not a good idea, but remember that these tanks have to pass hydro where they (i think) exert 8k psi, and the tank must have very little expansion. So nothing life threatening, probably nothing that would blow the burst disk even...

[SlartyBartFast]

Seems you have a point....

(72 - 32) x 4/9 + 273 = 290.8K
(220 - 32) x 4/9 +273 = 356.6K

Check your Kelvin conversions. I get (using a conversion tool):
72F = 295.3722K
220F = 377.5944K

So since V, n, and R are constant (volume, amount[moles] of gas, and gas constant), P1/T1 = P2/T2

As I had, P2 = P1 (T2/T1)
So, for the actual calculation I was wrong.... Whatever.
But are you sure Kelvin should be used? This website says Rankine:

http://home.flash.net/~table/gasses/charles.htm

IF the air system and the components are designed/built with adequate safety pressure relief. The working pressure that fittings and hose has to be rated for is the rating of the LP burst disk. No LP burst disk? Well, THEN everything has to be able to withstand tank pressure.