I just blew a Yong Heng burst disc. Help me not do it again

Forums Air Tanks, Pumps, Compressors, & Filters I just blew a Yong Heng burst disc. Help me not do it again

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    Loren
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    “Eaglebeak”

    “cootertwo”When the disc blew in my Yong Heng, I just installed 2 of the replacement discs, no more problem.

    
I would advise not doubling up the burst disc. It’s the same as using a nail to stop an elictrical fuse blowing. It may stop it tripping out but unless you know the cause, you run the risk of having a fire. In this case you risk an explosion. Using two disks will raise the burst pressure to over 10000 PSI, you might as well just use a stopper if you don’t want a safety device.

    How are going to get “an explosion”?  Don’t all tanks have a burst valve on them?  If the valve is close on the tank you make burst a line, a connection on the compressor, or damage the compressor in some other way.  The volume of air in the compressor and lines is pretty small, once a burst happens it will pretty well be done with expending energy. 

    I had problems with my Yong Heng burst disk failing in the 4000 to 4200 range.  The burst disk keeper ring on mine cracked and then the darn thing would not hold air at all.  I could not find a replacement of that ring.  I replace the burst valve with a bolt and o-ring….problem solved.  My tanks have 5000 psi burst disk on them.  I dont feel like I am in danger of an explosion and yes I have a healthy respect for the energy HPA has at these high pressures.  I also baby sit the compressor while it is running.

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    Kayakairgun
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    Between the burst disk in the bottle valve and the electric over load protection I feel safe running 2 burst disk in the pump. I also stay in the immediate area of the running pump, mindful for a change in sound or watching for differences in indicted pressers between tank and pump gauges.  

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    AirgunBill
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    “Eaglebeak”I use a non-return check valve fitting between the tank and filter. when the pressure in the line equals the tank pressure it opens automatically. I don’t have to close the tank valve before purging and shutting down. It also has the benefit of not losing a tank full of air if I have an O-ring fail between the pump and the tank which has happened to me before. The fitting is just a male foster to male 1/8NPT with a valve inside. It can be had for $2-$3 on flea bay. Screw it into a male to female 1/8 NPT and you’ve got a male to male adaptor that can be used in both directions, just make sure you have a bleed valve on the isolated side or you won’t be able to uncouple anything.

    
Could you provide a link for ebay or other place where I can purchase the correct foster check valve. I did some looking myself on ebay and could not find anything that appeared to be exactly what you described. Thanks Bill

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    Eaglebeak
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    The fitting that I’m using is no longer listed but this one is similar but has a 10x1mm metric thread so it will need to be paired with something compatible.​https://www.ebay.com.au/itm/Paintball-PCP-Fill-Nipple-Stainless-8mm-Air-Tank-One-Way-Foster-M10-M8-Threads/292235740409?ssPageName=STRK%3AMEBIDX%3AIT&var=591151157028&_trksid=p2060353.m2749.l2648  
    I hope this helps but as you can see it’s an Australian eBay site. This one willl fit the chinese filters. I just found the one I’m using on another site.  ​https://www.ebay.com.au/itm/Paintball-One-Way-Valve-Foster-Stainless-Steel-HPA-N2-Fill-Nipple-Kit-1-8-/263470105205?hash=item3d580ac275 This one is 1/8NPT.
     

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    BigTinBoat
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    “Loren”How are going to get “an explosion”?  Don’t all tanks have a burst valve on them?  If the valve is close on the tank you make burst a line, a connection on the compressor, or damage the compressor in some other way.  The volume of air in the compressor and lines is pretty small, once a burst happens it will pretty well be done with expending energy. 
     

    
This is what I envision as the outcome. If they(builder/designer) have the burst disc set to rupture just above the max designed output, they apparently don’t think it will sustain much more pressure.

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    AirgunBill
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    “Eaglebeak”The fitting that I’m using is no longer listed but this one is similar but has a 10x1mm metric thread so it will need to be paired with something compatible.​https://www.ebay.com.au/itm/Paintball-PCP-Fill-Nipple-Stainless-8mm-Air-Tank-One-Way-Foster-M10-M8-Threads/292235740409?ssPageName=STRK%3AMEBIDX%3AIT&var=591151157028&_trksid=p2060353.m2749.l2648  
    I hope this helps but as you can see it’s an Australian eBay site. This one willl fit the chinese filters. I just found the one I’m using on another site.  ​https://www.ebay.com.au/itm/Paintball-One-Way-Valve-Foster-Stainless-Steel-HPA-N2-Fill-Nipple-Kit-1-8-/263470105205?hash=item3d580ac275 This one is 1/8NPT.
     

    
Thanks Eaglebeak I was able to find similar fosters on US ebay with that wording. I have one more question if you would take the time. Which way is the air flow through this foster fitting allowed. It would appear to me in through the male side of the foster not the threaded side. Thanks again Bill

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    Loren
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    “BigTinBoat”

    “Loren”How are going to get “an explosion”?  Don’t all tanks have a burst valve on them?  If the valve is close on the tank you make burst a line, a connection on the compressor, or damage the compressor in some other way.  The volume of air in the compressor and lines is pretty small, once a burst happens it will pretty well be done with expending energy. 
     

    
This is what I envision as the outcome. If they(builder/designer) have the burst disc set to rupture just above the max designed output, they apparently don’t think it will sustain much more pressure.

    
Yes, I feel the little compressor is really working hard to get to 4500 PSI.  Just like the “little engine that could”

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    Eaglebeak
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    Yes, Bill, That is correct. If you pair it with another male fitting, you just turn it around if you want it to flow the opposite way. Always double check how you configure it before pressurizing.If you get it back to front, you might not be able to bleed the line. If you have a bleed on both sides, you should be fine.

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    AirgunBill
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    Decided to top off my Great White tank today to test my set-up with the one-way foster fitting. I started off with 3500 psi in the tank and planed to fill to about 4200 psi. The first time I filled I went from 3500 psi to about 4000 psi in about 12 minutes. I added my chilled water to my 5 gal. bucket started the water pump then the compressor. At about 9 minutes I had the burst disc pop off at about 3900 psi. The water temperature was still at about 45 celsius so pump was not over heating but I believe as other have mentioned these Yong Heng burst discs are just not calibrated right for the pressure. I went ahead as others mentioned and just doubled up on the burst disc replacement. I don’t think this will be dangerous as I have the set-pressure model and always stay in the area to monitor the compressor and the other pressure gauges. Bill

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    TheIceman
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    Eaglebeak has a good solution. I also use a check valve foster fitting. It came on my Stikman fill station. Once compressor pressure equals tank pressure, air flow automatically begins. Once compressor outlet pressure drops below tank pressure, the check valve prevents any backflow.

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