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7 litre 300 bar fill setup

Discussion in 'Anything Airgun Related' started by dm800, Jan 7, 2018.

  1. dm800

    dm800 Engaging Member

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  2. Popgun

    Popgun Donator

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  3. meerkat1

    meerkat1 Keyboard Hero

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    looks a good price :)
     
  4. Popgun

    Popgun Donator

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    Check the manufacture dates many are "old stock" & eat into the retest time , false economy. my cylinder was 2 weeks old, i asked b 4 buying
     
  5. dm800

    dm800 Engaging Member

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    [FONT=&quot]"A new charging set supplied with a 5-year test from date of manufacture."[/FONT]
     
  6. themadspread

    themadspread Donator

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    very good price anti kink hose fitted as well
     
  7. TrickyDicky

    TrickyDicky Life in the slow lane

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    If you already have a gauge and whip, they also do a cheaper cylinder, this is the way I need to go as a 3lt tank is just not quite enough if you use two guns on a regular basis.
     
  8. Popgun

    Popgun Donator

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    Agreed but when did the retailed take it into stock, that could be 4 yrs :D
     
  9. Popgun

    Popgun Donator

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    gauge on cylinder = 5 yr test
    no gauge on cylinder = 2 1/2 yr test
     
  10. jesim1

    jesim1 Kit bitch to the Stars

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    Hi Dan

    If I were you I'd stick with the 10L 232 which I know you have already - let me explain - I've used rounding and ignored things like surface pressure etc. - I don't want to get too into it, but you also have to remember "Van Der Waals laws - (from diving) - here: http://www.nigelhewitt.co.uk/diving/maths/vdw.html which basically says a 300 bar fill actually has the volume closer to a 270bar fill due to physics acting on gases under pressure after around 250bar – as pressure increases the gas get’s close to becoming a liquid – and you can’t increases the volume of a liquid – only it’s pressure – it’s basic hydraulics 101, so despite having a 300bar fill – it does not have what you would expect air volume wise due to this, even though it does have a higher pressure.

    A 7L 300bar tank weighs approx. 10kg, a 10L 232bar one weighs roughly 12kg, so a 10L is around 2kg heavier.

    A 7L 300bar holds around 7x300= 2100L of air (but actually more like 1900L due to the above laws of physics), and a 10L one holds what you would expect - 10x232= 2320L - so a 10L 232 holds roughly 400L of air more than a 7L 300.

    But there is more to it............

    Air gunners re fill a tank at say - 160bar, so you only use the air above that pressure, which means deduct what you have left from what you had to get what you used:

    7L, 300b cylinder: 1900L (VDW law) minus 7x160=1120 = 780L used

    10L, 232 cylinder: 2320 – 10x160=1600 = 720L used

    So in reality you get around an extra 60L of compressed air use from a 7L 300bar cylinder than you get from a 10L, 232 bar one - which meant 60/7= an extra 10bar in a 7L cylinder, or an extra 6bar in a 10L, 232 one!!

    The above is about right give or take a few educated guestimates, and if I were buying a new tank I would say get a 300bar version, but it does not make financial or practical sense to ditch a 10L 232 for a 7L, 300 at a cost of £175 – they give very similar fills in real life and the weight difference is only 2kg.

    ;)

    James
     
  11. busanga

    busanga Busy Member

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    So if i am buying first time , it still makes sense to get the 7L 300 Bar ?
     
  12. Oat

    Oat Very Active

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    It's a good unit price, but if i read correctly they will change £25 for delivery.
    Then note that it will be shipped empty - that means any RFD will charge premium for it's filling from an empty state (my guess would be £25 - £30). You now have a £230 bottle which i suggest any local RFD could price beat if you go and speak to them. So, not only is it available cheaper, if we don't support RFD's they will be gone... :up:
     
  13. Mike.lewis

    Mike.lewis Donator

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    Delivery is to your house not rfd, it's free aswell. But it is delivered empty.
     
  14. Eds81

    Eds81 Busy Member

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    I've a brand new one you can have for 100
     
  15. jesim1

    jesim1 Kit bitch to the Stars

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    In my opinion - yes, but if your buying second hand then location and price are just as important as a 7L is only marginally better than a 10L from a fill point of view as most people just do the maths without the knowledge of how gasses under pressure at 300bar actually behave - I'm not saying people are stupid, it's just a bit boring and complex, and not what you would expect if your not into this in a more in depth way. I only know about it as I'm a compressor operator and mixed gas diving instructor - so I have to know a bit more which has now filtered into my air gun hobby.

    In reality even getting a genuine 300bar fill is difficult, if I get 270 I know I'm not really losing out due to physics, but common sense makes you think you are "missing" 30bar:eek:

    I perhaps should say a 12L 232 is bloody heavy, especially when full, I would not even entertain a 300bar 12L as it's almost a 2 man lift:eek:. If you have the money a 9L 300bar carbon cylinder is a great way to go, it's more expensive and can have a limited life of around 15 years - but over than time it's worth every penny - "in my opinion";) It's what I bought.

    James
     
    Last edited: Jan 8, 2018
  16. Nubble

    Nubble Donator

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    7l 300 bar???

    If op not interested then I may be?? :D
     
  17. Popgun

    Popgun Donator

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    I have a 12ltr 300 bar no problem, you might invest in a Gym subscription :D

    My local RFD fills to 300 bar. i have checked the cylinder on refill. & a fill is a fiver, even if totally MT as it was delivered to me from SYA
     
    Last edited: Jan 8, 2018
  18. dm800

    dm800 Engaging Member

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    Go for it. As mentioned above distance is also important.
     
  19. jesim1

    jesim1 Kit bitch to the Stars

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    LOL :D - at around 50lb full I'd struggle like hell with that, the very though of a gym gives me pains in muscles I don't know I have, I'm definitely getting too old to do the things I used to do without even thinking of them - still got the bike our for a blast today though :D, I've go to at least do a good impression of growing old gracefully.

    James
     
  20. Rn76

    Rn76 Busy Member

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