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Quality of Air at events

H-PAC SERVICES LTD

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Nov 18, 2002
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Spoke to a few guys this weekend re air quality and system operation, they suggested i put a line on to explain a few myths, so here goes,
when air is compressed moisture droplets are formed and every compressor should have water drains and filters to remove these, if not it will destroy your air systems with one fill, every operator should have a record of filter changes and a Air Purity Test Cert to show the quality (we supply air at breathing quality and cert are always carried),
A log is also reqd by law to show maintenance is carried out and this is declared in what is known as The Written Scheme Of Examination which is a requirement of law for compressed air installations, insurance companies insist on this to cover the set up.
As for the chance of dirt entering the fill system we operate after filters to prevent any debris entering the fill rigs, with out saying how fine these are we can gareentee that we can take particals out which are smaller than the finest talcum powder so there pretty good.
Finaly a operator has a duty of care to ensure the equipment he supplys is safe to use and has the correct safety devices fitted and test certs should be availiable if any doubts arise.
For good clean air an operator has to maintain the standard of maintenance and change filters when reqd which dont come cheap if done correctly.
I would like to thank everybody at the 5 man euro and past events for the compliments on our system and we take pride in what has been described as the best ever used.
If anyone has any questions drop me a line and do my best to answer them.

regards

trevor

ps To Jef from Draxus and John from LPS sorry but the air system repair side of things at tournys seems to be drying up but at least the players are happy to save much needed beer tokens.:D
 

Fly

Platinum Member
Jan 25, 2002
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As always Trevor you provided us with a top quality service.
See ya next time.

Neil.
 

MrDan

Scratching On
Oct 14, 2002
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Once again cheers guys for the invaluable service u provide.

It wasnt very long ago that teams were all pi$$ing about with their own set of dive tanks or worse - site CO2!

Even Campaign was hugely improved simply because we didnt all have to queue up for half an hour each morning just to get a fill!:D
 
Dec 19, 2002
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Trevor mate this is gonna sound daft.

Up here in Scotland there's not alot to do beleive t or not, so................... The Clan find ourselves with these long peroids of time stuck with each other with nothing in particular to do.

Now on one of these days an arguement started between us all that went on for hours!!!
Then it carried on the next day, it was brung up at Campaign and we argued about it at Wrexham!

So can you please stop this bloody debate cause am sick to death of it, could you please tell us:

Does a marker weigh more, if there s a FULL 4500 psi fill in it, rather if it was totally empty???????

Mak D
:cool:
 

Bully

Well-Known Member
Jul 12, 2001
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Public Liability

Just another point to ensure is that your air supplier has public liability insurance the same as your tournie organiser.


H-pac have cover if you use any other suppliers please ask to see their policy.

Steve

With his UKPSF head on this time.
 

Sleeping Beauty

Look ... I got a star !!
Feb 1, 2002
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Originally posted by Mak_Daddy_*69

Does a marker weigh more, if there s a FULL 4500 psi fill in it, rather if it was totally empty???????
I can't believe you're even arguing about it.

How much does air weigh? And what about if you squash it?

Scottish ijjots !!


I think it's important that people are aware of the safety issues surrounding air. That guy had his eye put out not so long ago and it's because we're messing with high pressure air and not asking the right questions. It isn't just a case of a company deciding that they're going to supply air for a tournament - they should be professional and know exactly what they're doing - like HPAC.

Thanks Trevor for letting us know what we should be looking for with air. I'm sure any sensible tourney operator will employ you to do the air and if they don't then at least we know what to ask for when the replacements turn up !! "Can I see your certificate please mister !!"
 

gaff

www.hired-killaz.com
Mar 12, 2003
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'in ya face baby!'
i dont think i would enter a UK tourney if HPAC are not doing the air to be quite frank! why buy a £2000 gun and then ruin it for an extra £5 per head for HPAC air???
 

MrPink

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Aug 15, 2002
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Originally posted by Sleeping Beauty
I can't believe you're even arguing about it.

How much does air weigh? And what about if you squash it?

Actually, Air does have a certain weight - I can't find the thread (it was on Automags.org a while back) but a 68ci 4500 tank weighs something like 6-8 oz more when filled due to the molecules being compressed and therefore heavier - not much I grant you, but for those seeking an ultralight set-up, something to take into account:)
 

manike

INCEPTIONDESIGNS.COM
Jul 9, 2001
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Cloud 9
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Originally posted by Mak_Daddy_*69
Does a marker weigh more, if there s a FULL 4500 psi fill in it, rather if it was totally empty???????
Yes. Significantly.

Originally posted by Sleeping Beauty
I can't believe you're even arguing about it.

How much does air weigh? And what about if you squash it?

Scottish ijjots !!
And your point/view is?

Taken from the thread on AO discussing it.

Originally posted by Thordic
Using this formula:

Air has an average molecular weight of 29 (28 for N2*.8 + 32 for O2 * .2)
1 mole of gas at STP occupies a volume of 22.4 L, therefore, 29g {~1 oz)of air at STP occupies 22.4 L

Take you tank volume in Liters (ft3X28.3 or cu in X .0164) and correct to STP (forget the temperature, just multiply the volume by 204 or 306{3000psi/14.7psi; 4500/14.7psi}. This gives you the gas volume at STP.

Divide this volume by 22.4 and you get the weight of air in oz.


Using that, you get the following information:

3000 PSI = 204 atm
4500 PSI = 306 atm

47ci = 0.77 L
68ci = 1.11 L
88ci = 1.44 L
114ci = 1.87 L

So now, just plug it into what I said above, and you get these weights:

47ci 3000PSI tank: 7.0 ounces of air
68ci 3000PSI tank: 10.1 ounces of air
88ci 3000PSI tank: 13.1 ounces of air
114ci 3000PSI tank: 17.0 ounces of air

47ci 4500PSI tank: 10.5 ounces of air
68ci 4500PSI tank: 15.1 ounces of air
88ci 4500PSI tank: 19.7 ounces of air
114ci 4500PSI tank: 25.5 ounces of air

As you can see, the weight of compressed air is not negligible, especially in higher pressure setups.
More info and discussions about the effect of temperature etc. Can be found by reading this thread HERE!