Author Topic: Warning PCP Owner's that Hand-Pump  (Read 206 times)

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Offline 21grains

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Warning PCP Owner's that Hand-Pump
« on: August 18, 2018, 09:20:15 PM »

Offline Gambo

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Re: Warning PCP Owner's that Hand-Pump
« Reply #1 on: August 18, 2018, 10:51:40 PM »
Interesting article.

I read once that something like 95% of PCP's that Daystate get back in the workshop due to leaks are owned by people who use pumps to fill them.

Diver's quality air is BY FAR the best way to fill a PCP.


Thanks for posting Franky, applauded.

Offline Baggawind

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Re: Warning PCP Owner's that Hand-Pump
« Reply #2 on: August 19, 2018, 12:04:23 PM »
Interesting article. But, I have serviced/repaired dozens of pcp,s and NEVER seen corrosion like that. My old pal " Slaphead " uses nothing but an FX pump for all his pcp,s , mostly ones I built , five in all , and has never had a problem. A year back he asked me to modify the first pistol I made for him and, on stripping it , I found not even a hint of corrosion. And that pistol is now seven years old.  However, several years back all of my pcp,s developed corrosion at the muzzle end of their barrels. Turns out it was possibly caused by one of two things. Firstly , the dive shop had not cleaned or replaced their filters . They told me that breathing air doesn,t have to be totally dry , just clean and pointed out that the air we breath is contains moisture. Secondly, I was told by the owner of a well known gun shop that whist talking to Fred Axellson he said using a long whip connecting the bottle to the gun would cause moisture to form in the hose when venting the hose after filling. This means next time you fill your gun it would blow that moisture into the gun. He recommended using a short hose and venting it slowly. And, guess what ? At the time I was using a very long hose. Needless to say, I now use short hoses and vent slowly. Also, I no longer fill my bottles at a dive shop. I now get them filled by my late friends son who changes the desiccant filters regularly . 

Offline Gambo

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Re: Warning PCP Owner's that Hand-Pump
« Reply #3 on: August 19, 2018, 01:04:10 PM »
Fair comment.

We can only take the word of the dive shop that they are using a proper maintenance regime with regard to their filters to supply clean, and more importantly, dry air.


However, I'd still much prefer to have to trust them than use a hand pump.....not only from a filtration and dryness point of view, but also heat.

Everyone knows just how much heat is created when pumping up a bicycle tyre....and that's only going to 40 psi or summat, and not the 4,350psi a 300bar bottle is filled with. When that heat cools, any, moisture in the compressed air will have opportunity to condense on the inner walls of the cylinder, possible creating corrosion or rust. I'd rather take every step I can to avoid that happening, which is why I prefer the cooler method (if done slowly) of a trusted dive shop filling my bottles.

Offline airgunnut

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