Do I need to hydrotest tuxing bottle in 3 or 5 years, Do they even hydrotest non DOT bottles Im new to pcp airguns.

[MarksmanPete]

I bought a tuxing 6.8 liter bottle from amazon for $297 https://www.amazon.com/dp/B09CPRRLGY?psc=1&ref=ppx_yo2ov_dt_b_product_details it says manufacture date 9/22 so in 9/25 should I hydro or wait 5 whole years it says retest period 3 years but I see some people dont worry about hydro for 5 years on these bottles, Im not trying to go out like a taliban in my room an have my arm shoot thru the neghbors window.

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[Hateful McNasty]

Best thing to do is ask a local dive shop on thete testing or maybe like your fire department on who does there tanks. Maybe google a local place that does that service. Being a non dot tank thats somthing to ask in person so to say. Seemed like ateound here you drop a tabk off at the scuba shop and they send it in and you just pay like $30 ( could be more could be less depending on who , what or where). The thing is getting it magafluxed/xray for stress cracks in any test.

 

[Gerry52]

5 yrs is the U.S. regulations for U.S. mfg stuff. Here, there's a wide window of safety built in due to the robustness of rifle bottles. I've read ZERO reports this far of bottles ever "exploding" or of people hydroing them. The FITTINGS are more likely to give than the tanks themselves but do what helps you feel safe. This subject has been brought up here before.

 

[DesertSilver]

Best thing to do is ask a local dive shop on thete testing or maybe like your fire department on who does there tanks. Maybe google a local place that does that service. Being a non dot tank thats somthing to ask in person so to say. Seemed like ateound here you drop a tabk off at the scuba shop and they send it in and you just pay like $30 ( could be more could be less depending on who , what or where). The thing is getting it magafluxed/xray for stress cracks in any test.

You can't magnaflux or X-ray carbon composite. You can ultrasound scan it if you really know what you are doing. It's non dot and probably no one will hydro it. You must be filling it your self. The big thing is to check for corrosion inside the aluminum liner and for damage on the exterior of the tank.

 

[Hateful McNasty]

5 yrs is the U.S. regulations for U.S. mfg stuff. Here, there's a wide window of safety built in due to the robustness of rifle bottles. I've read ZERO reports this far of bottles ever "exploding" or of people hydroing them. The FITTINGS are more likely to give than the tanks themselves but do what helps you feel safe. This subject has been brought up here before.

Must not look too hard.. one of the dive shops i used has pictures of them that spit there bits and holes in the wall then the tanks that did as lesson examples..

You can't magnaflux or X-ray carbon composite. You can ultrasound scan it if you really know what you are doing. It's non dot and probably no one will hydro it. You must be filling it your self. The big thing is to check for corrosion inside the aluminum liner and for damage on the exterior of the tank.

Ok.. then that aluminum liner woud be of concern id guess . Never had carbon tanks ..so? Maybe why its not dot'ed?

Hate to be filling this up in the house or standing close around to it.

 

[DesertSilver]

The liner isn't a lot of the strength of the tank. The main reason for it is for the neck. You can't thread cf and expect it to hold hp. Most of the liner is thin which thickens as it gets near the neck.

 

[MarksmanPete]

You can't magnaflux or X-ray carbon composite. You can ultrasound scan it if you really know what you are doing. It's non dot and probably no one will hydro it. You must be filling it your self. The big thing is to check for corrosion inside the aluminum liner and for damage on the exterior of the tank.

Damn so they wont even hydro my bottle?, So self inspection to check for currosion an damage after 3 years I guess.

 

[MarksmanPete]

Must not look too hard.. one of the dive shops i used has pictures of them that spit there bits and holes in the wall then the tanks that did as lesson examples..

Ok.. then that aluminum liner woud be of concern id guess . Never had carbon tanks ..so? Maybe why its not dot'ed?

Hate to be filling this up in the house or standing close around to it.

View attachment 296770

Yup I saw that video aint no joke if it blows.

 

[MarksmanPete]

5 yrs is the U.S. regulations for U.S. mfg stuff. Here, there's a wide window of safety built in due to the robustness of rifle bottles. I've read ZERO reports this far of bottles ever "exploding" or of people hydroing them. The FITTINGS are more likely to give than the tanks themselves but do what helps you feel safe. This subject has been brought up here before.

Should I fill it to 4500 or 4350 would u happen to know I seen people on here talk about fillin g to 4350 max.

 

[rcs9250]

Contact PSICYLINDERS.COM.
They can advise you definitively.

 

[Gerry52]

"4350 max" is more about not pushing the limits of one's compressor, not tank. It's a good habit to get into, that of not pushing a compressor's limits. Especially if it's a cheaper Chinese compressor. It's not worth the strain of maxing it out for the extra 150psi of pressure.

 

[Gerry52]

@Mo-Ron, I'm a certified hydrotest tech. Have been for 35 years. I saw that video QUITE a while back. YES, that CAN happen. The LIKELIHOOD of it happening is close to nil, IF the tanks have not been physically abused by getting too hot or through stupidity of not being cautious of how they're handled. In 35 years I've NEVER seen it happen or personally know anyone who has! There's about a 7,000psi margin of safety built in. So, in my PROFESSIONAL opinion, I'm OK with "playing the odds" against it happening. EVERYONE has to make their own choices. High Pressure Air needs to be handled safely and with common sense ("There's nothing COMMON about common sense" - Benj. Franklin)

 

[Geezerhood]

@Mo-Ron, I'm a certified hydrotest tech. Have been for 35 years. I saw that video QUITE a while back. YES, that CAN happen. The LIKELIHOOD of it happening is close to nil, IF the tanks have not been physically abused by getting too hot or through stupidity of not being cautious of how they're handled. In 35 years I've NEVER seen it happen or personally know anyone who has! There's about a 7,000psi margin of safety built in. So, in my PROFESSIONAL opinion, I'm OK with "playing the odds" against it happening. EVERYONE has to make their own choices. High Pressure Air needs to be handled safely and with common sense ("There's nothing COMMON about common sense" - Benj. Franklin)

I talked to my long time friend who was an composite tech engineer responsible for designing and manufacturing carbon fiber tanks for military aircraft and other stuff, and he supported what you have said in other threads. He stated that carbon fiber does not fatigue like aluminum and steel do. Every time you fill an all metal tank, you fatigue the metal walls. If it is used under the design specs and you do not damage the tank, the Carbon Fiber wrap will likely never fail from fatigue causes, which is if I am getting it right, what hydro testing is all about. Catching the stretching of the tank walls before they stretch too far and fail from metal fatigue. Gerry52, please chime in if any of this is incorrect.

 

[Gerry52]

I talked to my long time friend who was an composite tech engineer responsible for designing and manufacturing carbon fiber tanks for military aircraft and other stuff, and he supported what you have said in other threads. He stated that carbon fiber does not fatigue like aluminum and steel do. Every time you fill an all metal tank, you fatigue the metal walls. If it is used under the design specs and you do not damage the tank, the Carbon Fiber wrap will likely never fail from fatigue causes, which is if I am getting it right, what hydro testing is all about. Catching the stretching of the tank walls before they stretch too far and fail from metal fatigue. Gerry52, please chime in if any of this is incorrect.

That is correct. Today's carbon fiber can be STRONGER than steel.

 

[MarksmanPete]

"4350 max" is more about not pushing the limits of one's compressor, not tank. It's a good habit to get into, that of not pushing a compressor's limits. Especially if it's a cheaper Chinese compressor. It's not worth the strain of maxing it out for the extra 150psi of pressure.

Guess what im handpumpin many would say thats unorthadox filling a 6.8 liter bottle to 4500 by pump but im in shape an not too old at all, So should I do 4500 I know I can, I filled my airguns to 4350 multiple times a day. I already did like 150 strokes, bleeding moisture every 40 strokes, got 1 blue moisture/oil filter attached, long ways to go but im ready time to burn whatever fat I got left.

 

[DesertSilver]

I've retired from the aerospace composite industry after 35 years. I've done testing of composites, laminated parts for f22 to Airbus. Impact damage and heat are your 2 enemys when it comes to composites. The liner enemy is water which will corrode the aluminum.

 

[Geezerhood]

I've retired from the aerospace composite industry after 35 years. I've done testing of composites, laminated parts for f22 to Airbus. Impact damage and heat are your 2 enemys when it comes to composites. The liner enemy is water which will corrode the aluminum.

What would happen if the very thin walls of the aluminum liner were corroded all the way through to the composite layer but the substantially thicker area where the threads are was not compromised?

 

[MarksmanPete]

I've retired from the aerospace composite industry after 35 years. I've done testing of composites, laminated parts for f22 to Airbus. Impact damage and heat are your 2 enemys when it comes to composites. The liner enemy is water which will corrode the aluminum.

Thanks for the info good to know I will check for damage once every few years.

 

[FelixS]

FYI, those Chinese (and Korean) bottles fall under the ISO standard, which is more stringent than the US DOT standard. The US DOT actually acknowledges this but dive shops and the like shy away from accepting and filling ISO bottles because they don't understand that aspect of the rule and have the, "better safe than sorry", attitude.

 

[Geezerhood]

FYI, those Chinese (and Korean) bottles fall under the ISO standard, which is more stringent than the US DOT standard. The US DOT actually acknowledges this but dive shops and the like shy away from accepting and filling ISO bottles because they don't understand that aspect of the rule and have the, "better safe than sorry", attitude.

The dive shop closest to me will refill any ISO or DOT standards tank that is within the 15 years after it was built time frame and has a current Hydro test. I was actually quite surprised but also pleased to hear that. So, I guess the trick will be to find a hydro testing business that understands that ISO standards are in fact superior to DOT standards.

I won't ever be hydro testing my tanks since I fill them myself. That said, I do plan to open every tank once a year and do a camera inspection of the inside and a close visual inspection of the outside.