Pneumatics over pressurized on arrival

[azapa]

I think the Seac Asso's are made in the same factory as many other guns, with just a few changes. Spago can probably confirm.

I have ordered two from Scubastore, and both, despite my instructions, what it says in the manual, and common sense, have been shipped pressurized.

I am guessing it stops the oil pouring out of the otherwise seated ball valve during shipping, but that would only take a really low pressure.

My first Asso was completely impossible to load.
My second one replacing a the first one that I lost, arrived with the plastic muzzle (between end if cylinder and barrel end itself) cracked along its length, and oil everywhere. I am guessing it too was sent overpressure and exploded on transit.

I have read of this from others around the web. Any similar experiences?

[dave]

It is very, very unlikely to have exploded due to overpressure. I have blown airguns up to over 60bar without mishap (not that I recommend it, it was an accident) The plastic part that cracked also doesn't see pressure along its whole length. It is far more likely to have been damaged by baggage handlers
People new to airguns often complain their new gun is overpressured, but it is more to do with technique. I used to struggle to load a 110 at 20 bar, now I load my 130 Mamba at 35bar with no problems and no Heath Robinson devices
cheers
dave
Spearguns by Spearo uk ltd finest supplier of speargun, monofins, speargun and freediving equipment

[GreekDiver]

no such thing as a over pressurized pneumatic Like dave said, i doubt it came over charged. Poor shipping and handling was the cause if i were to guess.

Dave,

What do you kill with that 130 mamba? Whats the longest shot and what kinda fish did you kill?

and no Heath Robinson devices

[Geoff]

Hi AZAPA,I also had great problems with my ASSO 135 with "Too high" pressure.The spear, actually "Bent" when I tried to load it!.The piece that "Cracked" on your gun, does indeed "See" pressure, it hold,s back the force of the piston,(which is under pressure) & keep,s it from shooting out.
With respect to people who say that they load their 115 + gun,s, at 35 bar, & over with, "no problem,s", well, I simply don't believe it!. I'm not saying that they're "lieing", just that their guns aren't at the pressure that they think they are.............. Geoff. PS. I've just completely striped my gun, & I was wrong!, this piece does not stop the piston, it is, however, subjected to the same pressure that the gun is pressurised to (that,s why it has two "O-ring" seals on it).

[dave]

Just because you cant do something does not mean that it is impossible plenty of people run Cyranos at up to 40bar. If my 130 Mamba isn't at 35bar, then 2 different pressure gauges are wrong by the same amount
The bit that stops the piston is the muzzle. the plastic part just acts as a plug on the end of the outer barrel
cheers
dave
Spearguns by Spearo uk ltd finest supplier of speargun, monofins, speargun and freediving equipment

[MARMIR]

....I know people who load assos 135 with a pressure of 32-33 bars by using a device: a kind of longer loader....anyway Geoff don't confuse 13mm barrel with 11mm, loading 35 bars with an internal barrel of 11mm is much easier....

[Geoff]

Please see my correction of my previous reply.I did say 115+. Cyrano's don't come longer than 115.Yes, I now appreciate 11mm is a lot easier to load than 13mm, thank,s. Please be advised, the outside tube on any "Asso" has an O.D of 40.0 mm, the tube wall thickness, is 1.2 mm. The pressure rating of any length of aluminium tube of this dimension is 31 BAR!. Even if the "seal,s" can take more, the outside tube will fail, at around this pressure, I am assuming that the material of this tube is indeed Aluminium, & not some "exotic" alloy, which I don't think it is..Geoff.

[GreekDiver]

i pump up my pneumatic till it squeals! Then i know its ready!

[MARMIR]

.....Yes Geoff is common alu (anticorodal) as thick as 1 mm. Once it's anodized
the tube gets a little bit thicker and tougher.....All I can tell you is that I put 35 bars
into a stealth and when I arrived to the sea spot the gun looked like a banana due to
high temperature....but my Mirage can hold 40 bars without a problem.....

[fer_abella]

Technique is essential to load a higly charged pneumatic gun.
A 34bar 13mm 135cm 7mm gun can be loaded with correct technique or not loaded at all.
MAnufacturers do not recommend preassure in excess of 25 bar. Most people use 30-35 bar for years with no problem, but compressed air is a dangerous thing to manipulate incorrectly.

Regards

[MARMIR]

you're right Fer! Last year I madified my gun and when reached 32 bars the gun exploded.
I was in the cantin and the blast was like a bomb....I couldn't hold a thing with my right hand for a week.....Since then I have treated my oleos with more respect...

[Geoff]

See, I told you, (With respect to ASSO's, Max Rec Pressure 20 BAR) 31+ BAR could fail!. All you people with gun,s pumped to around this pressure, (31 BAR) are holding a, "TIME BOMB"!!. Keep safe...Geoff. PS. "Remember", air increases in volume, or pressure, when subjected to a higher temperature than it's self, if this air is confined in a vessel, (Your Gun) with no mean,s of increasing in volume, or, of escape, it's pressure WILL INCREASE. A pneumatic gun, pressurized to, say, 30 BAR, could easily reach 35 BAR & more, if exposed to the heat of the sun, like, on the beach, or, say, on a boat. It may then, "BEND", or, "EXPLODE!", & if you are holding it at the time, well, need I say more?. I don't want to "labour" the subject, but why do you think all of the manufacturer,s constantly warn us not to, "Over Pressurize" their gun,s?, you see, they have a "Safety Factor" built into their Max Recommended Pressure,s, if you increase these pressure,s, you, "Eat" into this "Safety Factor", you then, have no margin for the increase of pressure, due to, "Environmental Condition,s". If you must use these "High" pressure's, ( & I do) keep the gun "Cool", even going to the trouble of rinsing it with cold water, if you're in a "Hot Environment". Look up, "Boyle's law" for an explanation. Please, everyone, don't mess with these LETHAL weapon,s unless you completely understand them........Regard,s...Geoff.