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cylinder testing i wouldn't recommend

Discussion in 'Anything Airgun Related' started by Westphalian, Aug 28, 2014.

  1. Westphalian

    Westphalian Donator

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    Got back home to find my wife looking guilty. My 7L dive cylinder had arrived earlier.
    "There may be a problem"
    "What?"
    "Yesterday i instructed the delivery company just throw any parcels over the (6ft) gate if no one was in"
    "What?"
    "I meant any parcels containing clothes"
    "not fragile effing compressed air cylinders that will be pressurised at 400 bar then?"

    The exterior packaging was all damaged but the bottle seems ok.
    i will be getting it filled at the weekend so if my posts stop you know there has been an explosion in the durham area
     
  2. Snipertez

    Snipertez Donator

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    b****r :eek:

    I'd suggest, for all concerned, that you get the bottle checked before filling up. T'is not worth the risk !
     
  3. Andy-K2

    Andy-K2 Posting Addict

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    I suppose its the old addage of "be careful what you ask for as you might just get it". To be fair to the wife, even if she didn't instructed them to throw stuff over the fence, chances are they would have anyway. Here's hoping all is well.:up:
     
  4. RichieRich

    RichieRich Ping!

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    To be fair, the courier should have known better than to throw something heavy over a 6ft gate
     
    Last edited: Aug 28, 2014
  5. tinmanofkent

    tinmanofkent Tiger King

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    I think there is a market for a manufacturer to produce some kind of box that parcels can be safely delivered into but not removed from. I see and here it a lot, parcel delivery is becoming the major annoyance of modern life.

    Hope your cylinder in okay.

    James
     
  6. jesim1

    jesim1 Kit bitch to the Stars

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    Don't panic - I used to do a lot of Scuba diving, and I've seen full cylinders dropped 15 feet down a harbour wall and just get scraped, they are seriously tuff. Any sign of damage would only be limited to the valve, and you would see it as it would have to be so serious to bend the valve.

    In the airgun world people think of these as fragile :D - forget that! I've handled literally thousands over the years, NEVER seen one go pop.

    James
     
  7. kermitboy1

    kermitboy1 Banned BANNED

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    You should see the way that parcels are handled within aviation. When I send any item, if I cant pack it well enough, so that it can be deliberately dropped and still be ok, then I don't send it. Sad state of affairs, but its the world we live in. Football with parcels, I often say. KB1
     
  8. oliver13

    oliver13 Donator

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    What he said, if there was any damage you'd see it.
    6ft onto any surface even concrete is nothing at all, only the gauge could be damaged - it doesn't mean they should have done it though...
     
  9. vitalich

    vitalich Keyboard Hero

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    u can simple comply to the courier company for a full coverage and order a new cylinder
     
  10. Jim of Cov

    Jim of Cov Donator

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    Seeing FRAGILE on a packet at Royal Mail is a constant source of mirth. Some guy comes out after me yesterday and says "You managed to force the parcel through the letterbox then?" Do you want to parcel or not?
    First rule of Post Club: If you don't take the draught excluder off, you're not really trying.
     
  11. Westphalian

    Westphalian Donator

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    My wife (as punishment) took it to a dive shop today. Apparently she said "can you fill it with stuff?" The guy said as it is new he had to keep it for a few hours after filling "for the air to settle and then top it up as it would lose 30% pressure"???? I'm no physicist but that doesn't ring true. Mind you, this is second hand from my missus ;-) I know you have to charge it slowly cos of the heat and subsequent cooling causing loss of volume
     
  12. splat

    splat Donator

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    if they were that flimsy there'd be firemen flying through the air left ,right and centre.....have a good look, use common sense. if there's no visible damage I'd not worry about it. if you are a worrier then £35 quid will pay for it to be tested. ( your not limited to set times, can test as often as you can afford..regs are only minimum frequency) ATB
    filled to pressure when hot, can drop as much 20/30 bar (on 200bar cylinder) as it cools to room temperature. so approx 10% anymore is exaggeration.
     
    Last edited: Aug 28, 2014
  13. Westphalian

    Westphalian Donator

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    I am a worrier but I am also tight. It will be fine
     
  14. RichieRich

    RichieRich Ping!

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    Happened with me the first time i got my new 9ltr tank filled. Because of the time it takes to fill, there's a lot of heat in the tank from the air from the compressor. They filled mine to 300Bar as normal, and when i got home, the tank had cooled down, and pressure read 270bar. Took it back, and they topped it up foc. They said this is normal for a first fill, subsequent fills there will always be a little air left in the tank to stop this from happening in future.
     
  15. oliver13

    oliver13 Donator

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    I've seen lots of Firemen flying through the air, left, right, centre & complicated curves - this has never been due to a cylinder rupturing.
     
  16. splat

    splat Donator

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    Lol...you need to tell your pump operator to reduce pressure at the branch..pmsl
     
  17. jesim1

    jesim1 Kit bitch to the Stars

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    The drop in pressure after cooling is normally around 10%ish as Splat says. This is not as apparent when filling a half full tank, as your only getting it half filled! If you fill an empty tank, then your getting it all filled, and there is twice as much air going in, so it creates more heat, so it expands more and creates more pressure - this then reduces as the tank cools, making your 300bar more like 260/270bar. Physics, don't you just love it? :D

    James
     

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