The AirGun Guild

General Category => Airgun Tanks, Compressors and Filling => Topic started by: rsterne on September 20, 2017, 12:33:32 PM

Title: Compressor Explosion = Apparent Crankcase Failure
Post by: rsterne on September 20, 2017, 12:33:32 PM
No idea of the make or model, or what caused the failure.... but this HPA compressor failed big time....

(http://i378.photobucket.com/albums/oo221/rsterne/Important/pump1_zpsbh2eb4fz.jpg) (http://s378.photobucket.com/user/rsterne/media/Important/pump1_zpsbh2eb4fz.jpg.html)

(http://i378.photobucket.com/albums/oo221/rsterne/Important/pump2_zps517iw9ll.jpg) (http://s378.photobucket.com/user/rsterne/media/Important/pump2_zps517iw9ll.jpg.html)

Anyone recognize the type?....

Bob
Title: Re: Compressor Explosion
Post by: bnowlin on September 20, 2017, 12:44:11 PM
Just look how thin that metal is.  Hope nobody got hurt not supposed to be pressure in that area.  That is what that breather is for in top.  looks like only 1 cylinder, not like my Air Venturi for sure.
Bobn
Title: Re: Compressor Explosion
Post by: rsterne on September 20, 2017, 01:23:03 PM
My guess was a sudden leak that pressurized the crankcase.... Perhaps the piston cracked, or maybe a ring failure?.... I suppose the vent could have been plugged?.... If you fill the oil through that vent, I suppose it's possible it was leaking and the user found some creative way to plug the vent to stop the leak, causing the pressure buildup....  ::)

Bob
Title: Re: Compressor Explosion
Post by: oldpro on September 20, 2017, 02:00:13 PM
Chinese EBay compressor. I'd guess the case vent was plugged. I can understand why though the one I tried spewed oil fumes out like crazy
Title: Re: Compressor Explosion
Post by: bnowlin on September 20, 2017, 02:03:09 PM
The breather is just like mine and that red piece comes out So maybe it is plugged. Or too much oil
Bobn
Title: Re: Compressor Explosion
Post by: bnowlin on September 20, 2017, 02:44:49 PM
Actually that red piece was screwed into the crankcase when new and no oil and the black breather was in a sack so I' guessing that the oil was put in and the breather was stopped up and no place for the piston to back breathe. and boom.  Looks like everything in one piston too an 2 or three stage.
Bobn
Title: Re: Compressor Explosion
Post by: steveoh on September 20, 2017, 03:22:56 PM
The breather is just like mine and that red piece comes out So maybe it is plugged. Or too much oil
Bobn

Bob, How's your AirVenturi compressor holding up? Any idea how many hours you have on it?

Title: Re: Compressor Explosion
Post by: bnowlin on September 20, 2017, 03:45:13 PM
The compressor is great only had one little glitch in that I thought it was running a little hot and I got to talking to Jordan at PA/VA and he said they were getting some water pump were wired backwards.  Sure enough mine was and was of course pumping backwards and slow.  He sent me another and it didn't work at all then another and it was backwards So I rewired and seems to be better.  Other than that it is great I estimate only 25 or 30  plus hours.  I personal think those pumps are to small to run on 24 V even if is built for that.  I am gonna, for my piece of mind, put a double fan radiator on it and I have another pump coming that I think will do the job.  we'll see.
Bobn
Title: Re: Compressor Explosion
Post by: int3man on September 20, 2017, 04:20:20 PM
Hi Bob,
             I tried to look closer at the vent plug in the picture but it looks like a plug.  We used to get this all the time with the single acting dump trailers, they would not install the breather, it would go up slow because it was pulling a vacuum in the reservoir.  But when they hit lower they would blow the reservoir of the power unit!  1 to 2 gallons of Oil EVERYWHERE!  Never saw it happen but saw a bunch of elongated reservoirs, with the bolt tabs broke off!

Michael :- )
Title: Re: Compressor Explosion
Post by: rsterne on September 20, 2017, 05:49:38 PM
Apparently the compressor filled a tank to about 1000 psi, and then the pressure stopped increasing and BOOM!.... First time he used it is the story....

Bob
Title: Re: Compressor Explosion
Post by: bnowlin on September 20, 2017, 05:56:43 PM
A Ha backpressure no vent
Bob
Title: Re: Compressor Explosion
Post by: Alan on September 21, 2017, 05:44:45 AM
Here you go, all $383 dollars of it:

http://www.ebay.com/itm/Electric-PCP-Air-Compressor-for-Airgun-Paintball-Refilling-High-Pressure-300Bar-/152707808208?epid=17002950926&hash=item238e183bd0:g:2P8AAOSwq9tZlVyK

This is one of many which come from China, and sold by arbitrage resellers all over ebay! The import pricing from Alibaba in 10 lots, is under $200US including shipping. If you look for other photos on this unit, you'll see a red tag attached to the vent. That tag warns the user about the possibility of failure if things aren't assembled correctly. Problem is, it is in Chinese!

All this brings up a related subject—safety! Some folks just have to go cheap, and you can clearly see the results! Well sir, this is one facet of air gunning where it doesn't pay to do so! Any gas, compressed to 300+ bar, is going to be a bomb waiting to go off in the hands of the uneducated. I'm surprised we haven't seen more of this in the news.
Title: Re: Compressor Explosion
Post by: bnowlin on September 21, 2017, 06:26:46 AM
Like I have always said and always will there is a MAJOR difference between CHEAP and inexpensive.  There is a guy on Ebay taking Make an offer bid and some are going for less than $200 what is wrong.
Bobn
Title: Re: Compressor Explosion
Post by: sixshootertexan on September 21, 2017, 07:27:03 AM
That thing at the bottom y'all are calling a plug is an oil level sight glass, not a vent. I don't see a breather.
Title: Re: Compressor Explosion
Post by: bnowlin on September 21, 2017, 07:34:07 AM
The breather is the tall black plastic pipe on top of the crank case the site glass is on the bottom facing out BTW if overfill the oil will squirt out the top of the breather.
Bobn
Title: Re: Compressor Explosion
Post by: sixshootertexan on September 21, 2017, 09:44:03 AM
Ok I see it.
Title: Re: Compressor Explosion
Post by: grumpy on September 21, 2017, 06:45:40 PM
Ya get what ya pay for. Anyone who trusts a 2-300 buck HPA compressor obviously does not value their life, as much as I do..
Title: Re: Compressor Explosion
Post by: oldpro on September 23, 2017, 11:02:02 AM
Ya get what ya pay for. Anyone who trusts a 2-300 buck HPA compressor obviously does not value their life, as much as I do..
I agree
Title: Re: Compressor Explosion
Post by: squirrel hunter on September 23, 2017, 02:34:41 PM
 I got one and it fills up Mrod just fine.when it blows up and kills me I will let you know...
Title: Re: Compressor Explosion
Post by: squirrel hunter on October 21, 2017, 08:27:02 AM
  UPDATE:after filling Mrods many times only thing I can say is it takes 27 seconds to fill Mrod after shooting three 8 shot clips.oh and I had to order more pellets(four tins of JSBs)...temp to 29.9c...the break in period is over and the yong heng is getting a oil change...I hate to say it but I don't think there will be any type of life threatening explosion here,maybe someplace else if a unit gets abused...
Title: Re: Compressor Explosion
Post by: rsterne on October 21, 2017, 10:36:33 AM
The concensus of opinion is that the breather was plugged or improperly installed on the unit I posted the photo of.... and blowby raised the crankcase pressure to the point the end of the casting blew off....

Bob
Title: Re: Compressor Explosion
Post by: cootertwo on October 21, 2017, 10:55:02 AM
Yup, had to be plugged breather. I've seen other pictures where they have a red plug screwed into the hole where the breather, (long black piece) is supposed to go, and the breather, (long black piece) is in the plastic bag, that the accessories come in. You're supposed to remove the red plug, toss it in the trash, and install the long black vent, after you add the oil. I've got a Yong Heng, similar, but not exactly like the one that blew, and it has worked so well, I ordered another as a back-up. My original is 110 volt, and the one I just ordered is 220, has an auto cut-off, and will be used in my barn where I have 220 easily accessible, and I'll plumb the cooling water into my home water system. I've viewed all the youtube videos, of all the different makes of these compressors, and some of the much more expensive ones appear to have the same basic compressor as the Yong Heng, just more fancy add on's, like a built in radiator, more robust pressure cut-off switch, moisture trap, etc.  :)
Title: Re: Compressor Explosion
Post by: squirrel hunter on October 21, 2017, 10:59:16 AM
Yup, had to be plugged breather. I've seen other pictures where they have a red plug screwed into the hole where the breather, (long black piece) is supposed to go, and the breather, (long black piece) is in the plastic bag, that the accessories come in. You're supposed to remove the red plug, toss it in the trash, and install the long black vent, after you add the oil. I've got a Yong Heng, similar, but not exactly like the one that blew, and it has worked so well, I ordered another as a back-up. My original is 110 volt, and the one I just ordered is 220, has an auto cut-off, and will be used in my barn where I have 220 easily accessible, and I'll plumb the cooling water into my home water system. I've viewed all the youtube videos, of all the different makes of these compressors, and some of the much more expensive ones appear to have the same basic compressor as the Yong Heng, just more fancy add on's, like a built in radiator, more robust pressure cut-off switch, moisture trap, etc.  :)
I was thinking of a backup also.not pumping makes a huge difference...
Title: Re: Compressor Explosion
Post by: cootertwo on October 23, 2017, 05:39:35 AM
I'll have to look for it, but I stumbled upon a youtube video, where the guy completely takes his Yong Heng compressor apart, shows all the parts, then re-assembles it. Only chepee thing about it is that there is no bushing on the connecting rod, just aluminum on steel. Like just about all your cheap lawn mower motors. I can live with that, for the price.
Title: Re: Compressor Explosion
Post by: Martin on October 23, 2017, 07:54:56 PM
I see some guys wanting to stand up for these cheap compressors but I think you guys just threw money away and I am guessing you will come to realize that soon enough (I hope I am wrong). I get by having a tank filled for now but I will buy probably air venturi. It's a reliable name, the price is about as good as they get for now but who knows what the future may bring.  Thanks everyone for your input.
Title: Re: Compressor Explosion
Post by: Steelhead on October 23, 2017, 08:46:21 PM
I'll keep you posted. My AV compressor arrives tomorrow.
Title: Re: Compressor Explosion
Post by: squirrel hunter on October 23, 2017, 08:54:10 PM
I see some guys wanting to stand up for these cheap compressors but I think you guys just threw money away and I am guessing you will come to realize that soon enough (I hope I am wrong). I get by having a tank filled for now but I will buy probably air venturi. It's a reliable name, the price is about as good as they get for now but who knows what the future may bring.  Thanks everyone for your input.
no martin I think you are wrong.i see guys standing up against guys like you calling them cheap.so are they cheaply made or cheap in cost?do you own one?have you ever pump anything up with one?so how can you call it cheap?so you think guys should get a tank and drive 65 miles to get them filled?
  I have one and its beats pumping,we see how long they last and how many airgunners get killed using them..,i still pump my discos and maximus....
     
Title: Re: Compressor Explosion
Post by: oldpro on October 23, 2017, 09:23:29 PM
I see some guys wanting to stand up for these cheap compressors but I think you guys just threw money away and I am guessing you will come to realize that soon enough (I hope I am wrong). I get by having a tank filled for now but I will buy probably air venturi. It's a reliable name, the price is about as good as they get for now but who knows what the future may bring.  Thanks everyone for your input.
no martin I think you are wrong.i see guys standing up against guys like you calling them cheap.so are they cheaply made or cheap in cost?do you own one?have you ever pump anything up with one?so how can you call it cheap?so you think guys should get a tank and drive 65 miles to get them filled?
  I have one and its beats pumping,we see how long they last and how many airgunners get killed using them..,i still pump my discos and maximus....
   
  This is the same compressor just in a smaller frame that uses the same fragile bronze/plastic impregnated rings and no oil vapor separator that Mrodair sells. I had that compressor apart so many times I know it by heart!!! That is the same cheap and very flawed Chinese compressor no doubt!!! Your best bet is to stay far clear of it and save your money. Just look up all the Mrod air reviews online of their Airmax compressor its overwhelmingly bad and I will simply state I agree with the reviews based off my own experience. I wouldnt give one to my worst enemy on a bad day, just like the airmax compressor it will work awesome for a short period with short cycles but eventually those plastic/bronze rings will start to fail then serious problems can arise from oil bypassing the rings and becoming very dangerous fuel or like in my case just not running up to pressure and putting tons of back pressure into crank case and filling the room with oil fumes. Im sure thats why the one case explosion happened because the owner got tired of smelling burning oil fumes and plugged the vent. Be safe my friends and stay clear of this machine. 
Title: Re: Compressor Explosion
Post by: squirrel hunter on November 01, 2017, 01:25:45 AM
 so what compressor should we buy?what is the cost of the compressors we should buy?who should we order it from?will they have an air breather that needs installed?
Title: Re: Compressor Explosion
Post by: Alan on November 01, 2017, 06:52:14 AM
No matter why or how you got into PCPs, sooner or later (usually sooner) you'll realize that hand pumps, dive and paintball shops, fire departments, etc., are stop gap measures. Even booster pumps are a stop gap if you shoot a lot. Yes, you can use nitrogen or helium bottles, but the same logistic scenario arrises. Best bet is to swallow the bullet (pellet?), and buy a top-quality, high pressure compressor. And a good portable tank too!

I bought an Omega Air Changer about a year ago (in hindsight, I should have purchased the deluxe version). This purchase allowed me to shoot much more than I ever planned. Of late, I've just been refilling the 4,500 psi bottle for backyard shooting (≈30 rounds). Out at the ranch, I take the small bottle, or the larger one if out for the day.

The bottom line is, until you get to this point in PCP ownership, you'll never know why a top-quality compressor is a must-have! And as Travis alluded to, don't go cheap—your life depends on it!
Title: Re: Compressor Explosion
Post by: squirrel hunter on November 01, 2017, 09:11:51 AM
 WOW how many air gunners have been killed so far?i did see two explosions that happened but they were user error not really the fault of the cheap compressor.
Title: Re: Compressor Explosion
Post by: rsterne on November 01, 2017, 02:53:03 PM
We're pretty sure it was an improperly installed breather that caused pressure to build up in the crankcase, which blew the end off it.... It looks like the pressure involved was pretty low, perhaps a good thing the aluminum is so thin.... We're not dealing with an HPA event here....

Bob
Title: Re: Compressor Explosion
Post by: squirrel hunter on December 13, 2017, 06:03:00 AM
We're pretty sure it was an improperly installed breather that caused pressure to build up in the crankcase, which blew the end off it.... It looks like the pressure involved was pretty low, perhaps a good thing the aluminum is so thin.... We're not dealing with an HPA event here....

Bob
thanks bob for sweeping the BS away surrounding these cheap compressors.you know they so cheap I decided to order the pressure customized unit and it functions perfectly...I have to admit I knew there was no HPA explosion just by looking at picture...the only problem I had was my girlfriend ask me what was in that big box fed-ex delivered and I told her it was pellets and she ask in a box that big?i said ya and I don't think she believed me...