Canadian Airgun Forum

All I am saying is that if this was the "first time he used it" there must be more than one incident here....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal; Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!

There is another possibility. If it overheated and the oil level was low, the crankcase could have been filled with oil mist and a very hot crank or piston may have ignited it.

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When the 425-hp "street Hemi" version hit the street in 1965, it was akin to taking an M230 chain gun to an arcade shooting gallery
Peter

Looks like there was pressure where they shouldn't have been any...
- If this was a "new" pump and blew on 1st use, I'll wage $1 on a plugged vent hole.

Thanks for sharing about the other story clarifying what really happened Bob. Not fair to blame the pump if the guy didn't take care of it.

Sent from my SM-G930W8 using Tapatalk

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Website: https://airgunarcheryfun.ca/

Talked to the owner for some details to help would be buyers here. It was indeed his first time to use it and was instructed by the dealer to "tighten" the bleeder before operating the unit which he did by hand. Other than that he did as instructed by the dealer . Also he is using a model which was advised not to use other than to fill tanks up to 500cc ( which he was during the time of explosion). I'm not sure what model this is but looking from the pictures, it's one of those base model offered in Alibaba. I am deducing it's product quality which is suspect but again any comments from technical experts which would help buyers here in Canada is welcome. I myself is planning to get one and am on the fence whether this, or an Altaros booster which has the capability of charging air by using air,sourced from another scba or scuba tank.

Thanks for the additional informative data.

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Aim,hold your breath and follow through

That looks like the crankcase and cyl from the cheapie shop air pumps made in china that I see sold at any auto parts store for $100, but with a very different cylinder head on it, obviously. As long as it still works I'd say run it w/o the case cover. Maybe for others I'd do the same, or make a much larger hole in that cover to let such incidents vent w/o damage.
Is that water on the ground? If so why? If that case filled up with water then maybe the case ruptured due to hydraulic action? Just guessing but an actual explosion seems just as unlikely to me.

Has anyone tried to make s similar head setup to convert a regular cheapie pump? I've always wanted to make a pcp pump but too far back burner on my projects list. Maybe someone here could make some $ selling said head?

Friction plus oil mist = boom. Very nice.

Thanks for sharing some more info Apitagan.

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Website: https://airgunarcheryfun.ca/

I shared this story on the GTA, and can report that in addition to the "other" compressor that failed from lack of maintenance, there is a third compressor, identical to this one, that failed in the same way.... From Oct. 29....


and then from today....


If you look at the original photos, there is a piece of red plastic on top of the black vent tube.... According to the information on the GTA, that red plug is installed during shipping, and you are supposed to replace it with the black vent tube.... The red plug should NOT be used, so likely the failure was due to improper venting of the crankcase.... As the pressure built up in the crankcase due to blowby past the rings, the output pressure would no longer build, as reported by the owner.... Eventually, the crankcase pressure (where there should be none) blew the end off the crankcase.... Seems logical to me....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal; Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!

Good to finally get a better picture of what is happening. Sounds like some dangerously poor instructions, but if installed correctly, wouldn't have happened.

Sent from my SM-G930W8 using Tapatalk

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Website: https://airgunarcheryfun.ca/

Nice observation Bob and thanks for sharing. I am guessing it's more of "user" error than the pump quality why the explosion occurred. I talked to the other members of the forum back home where the incident happened and according to them, the owner doesn't want to talk much anymore for fear of not getting his refund/replacement and being "bashed" by the group because of his doing/undoing.. This pump seems to be ok to to the job and for its value for money. Just would like to get some information about air moisture eg, how is the pump in terms of generating moisture transferred to the tanks or guns when being pumped . I saw a thread about the air filter filled with molecular sieve and it would be another cost to add to this project..

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Aim,hold your breath and follow through

OP pictures had the breather installed...it is the longer tube with a red insert on top.

like this



the shipping non-breather plug looks like this

I have never had, or seen, one of these compressors.... There were pics shown on the GTA, and the red plug was not supposed to be installed in the top of the black breather, according to the guys that own them....

Regardless of whether or not the top of the breather should be red or black.... it seems the mystery has been solved.... The breather was not installed and/or not working properly, and crankcase pressure that should not be there built up until it blew the end off the crankcase....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal; Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!