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Pcp Charging...

Discussion in 'Technical' started by Ramsay, Mar 20, 2020.

  1. Ramsay

    Ramsay .... gone Plinking

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    Location:
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    HW110 pressure gauge.jpg
    Here's the situation:
    Last weekend I had my 4ltr. dive bottle topped up to 300 BAR, at least that's where the dive shop compressor turns off.
    Since then I charged my HW110 upto 200 BAR as is the max. I have never over charged my cylinder and it never seems to be a problem to stop on the 200 indicator..
    So it's been 3 or 4 fills and I thought I'd let it go just over 200, but it wouldn't..It stayed steady on the mark.
    HW110 cylinder specs.. 0.17 ltr 200 BAR (min 120 BAR)
    Dive Bottle 4 ltr 300 BAR
    450mm Microbore Hose, bleed loss...is less than 0.005 ltr
    By my calculations..I should have more than 20 charges in my dive bottle before 200 BAR
    ..So why can't I charge past 200..?
    It can't be right that I only have 4 toppings up the gun cylinder before my bottle is at 200..
    I never heard of a regulating valve on the charging end of the cylinder...Is there any such thing?

    https://sye.dk/airgun/index.php?inp...nxmZjAyMWFlZjRhMzdlYTQxZjUxYzk4NzZhYzYyOGY3Yw
     
    Last edited: Mar 20, 2020
  2. Bezzer

    Bezzer Posting Addict

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    You need a blanking plug in the end of your fill hose or the valve itself you can then open the valve and see what pressure you actually have in the bottle. It all seems to point to a low pressure in the bottle, looks more like they filled to 232 not 300 bar.
     
    Last edited: Mar 20, 2020
    sharpsman, John Gibbins and Ramsay like this.
  3. Ramsay

    Ramsay .... gone Plinking

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    My thoughts as well.. Have to see if they're even open tomorrow... Denmark seems to be closing down everything. If not I can still shoot a couple more days and then it's springer time again..
     
  4. blklab

    blklab Engaging Member

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    dive bottles never get to 300 bar they should put them in water, I cant say I have ever had 300 bar in bottle, have had a lot less, with pcp needing over 200 bar I think home compressors will become more popular
     
  5. sagalout

    sagalout What a plinker!

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    Location:
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    Using my Ying Tong Diddle Eye Po compressor I can fill my 7L to 300 bar. Once everything has cooled it is at 280 bar.
     
    Ramsay and Pete236 like this.
  6. Tim_B

    Tim_B Pro Poster

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    Interesting. When I fill my 12 litre with the omega there is no heat whatsoever, so when it’s fills to 300bar, it stays at 300 bar. Probably means a slow fill, but very effective.
     
  7. sagalout

    sagalout What a plinker!

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    Yeah, the Ying Tong generates a lot of heat because it's processing 50L per minute. If I fill my 200cc Uragan bottle from 100 to 300 bar it takes about 90 seconds the bottle feels warm but if it's left to cool it drops to about 270.
     
  8. no country members

    no country members Tooled up tool

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    Do you know how long it takes the Omega to top up your bottle from 200 to 300? :D
     
  9. Tim_B

    Tim_B Pro Poster

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    Longer than the Chinese compressors, but if you add the cooling down and topping off I bet it’s not far out :p
     
  10. no country members

    no country members Tooled up tool

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    I was wondering how long in minutes matey not in comparison to the Chinese ones. May consider getting one to top up my bottle that's all. :D
     
  11. Tim_B

    Tim_B Pro Poster

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    Ah ok - I’ll time it next time. I went from 275 to 300 in about half hour last night - wasn’t timing though

    it is slow...but that also means no heat. it’s also very quiet and a self contained unit.

    to be honest it’s overkill for what I need but it’s bloody nice and convenient, which is fine by me :D
     
    no country members likes this.
  12. Ramsay

    Ramsay .... gone Plinking

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    So to cut a long story short... at the shop I asked if he could see how much pressure was left in the bottle... the answer was 220 BAR:eek: it was reading under 180 BAR both on my gun and bottle..
    So now I'm unsure if it's the gauges on my gun and bottle that aren't reading the right pressure, or the manometer on the dive shop compressor.
    I don't have a plug yet so I can't open the bottle completely and see the bottle gauge reading..and I don't want to push my gun to a full 300 BAR.
    It's just not likely that two separate and individual gauges should read 40 to 50 BAR less than 1 dive shop gauge....or is it?
     
  13. Del-Dredd

    Del-Dredd Engaging Member

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    Location:
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    Should have got him to fill to 300Bar like it was supposed to be, if bottle only had 220 in, it was not filled to 300 in the first place as you surmised.
     

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