Mod with Safety issues???

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rolygate

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Around this time might be a good place to flag up a few points.

1. To be honest, there isn't a lot of difference between the device in question and many others also for sale. Many other metal tube mods that could take two batteries and have no electronic controls would fail the balloon air pressure test. For example my SB does. Some will vent at high pressure, some won't. Some will take the pressure without major issues, some will disintegrate. Some will fire the bottom end off, some will fire the top end off. There's no real way of telling without extensive testing or some kind of history of incidents. We know of four or five different brands that have exploded or gone super-rocket, so it may be a little unfair to pick on a new model that is to all intents and purposes the same as many already on sale. We know that existing models explode so why the big deal about yet another? They all need fixing.

2. Drilling a couple of holes somewhere isn't going to fix it. Imagine your sister is holding a small, low-power grenade in her hand, in front of her face. Are you going to be happy about it if there are a couple of small holes? No - because it will still explode. This is the stage we were at a couple of years back: thinking some small holes would be OK. We've moved on a long way since then. Now we know that the gas vents need to be a whole lot bigger or all they do is give you three seconds to drop the device.

3. Holes at the bottom are probably better than nothing but they don't fix the main problem: the batteries swell and block the tube, then pressure builds up at the top end of the tube. It needs gas vents at the top - substantial ones. Remember, the two explosions this year both blew the top end off into the user's face, and there is a reason for that.

4. ECF cannot possibly win on this issue. There was hysterical, vitriolic criticism of us for even daring to suggest that APVs need gas vents. I think many people have forgotten that. The community, the vendors, and the vendor's fanboys really laid into us for ramping up the EMSS when it was obvious it needed better provisions and more promotion. The attacks on us were vicious and persistent, with threads running for dozens of pages accusing us of who knows what. And now? Now, we have a situation which appears to be the direct opposite - people are screaming for us to remove a vendor and/or not doing enough.

We don't make rules about products and we don't do knee-jerk reactions. The trade needs to sort itself out and the community need to decide exactly what they want. One day they are bitterly attacking us for suggesting safety features, the next they are saying we haven't gone far enough.

Luckily this will soon be out of our hands. Someone else can take all the criticism for doing something/nothing, then next week take the flak for doing the opposite.
 

Uma

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Rolygate:
"2. Drilling a couple of holes somewhere isn't going to fix it. Imagine your sister is holding a small, low-power grenade in her hand, in front of her face. Are you going to be happy about it if there are a couple of small holes? No - because it will still explode. This is the stage we were at a couple of years back: thinking some small holes would be OK. We've moved on a long way since then. Now we know that the gas vents need to be a whole lot bigger or all they do is give you three seconds to drop the device.

3. Holes at the bottom are probably better than nothing but they don't fix the main problem: the batteries swell and block the tube, then pressure builds up at the top end of the tube. It needs gas vents at the top - substantial ones. Remember, the two explosions this year both blew the top end off into the user's face, and there is a reason for that."


This has had me confused for quite some time now. Perhaps my questions should be in another thread, but sheesh, while we're on the subject....
1. How do we, as consumers, know the formula for size of airholes per size of battery and type of material?
2. How do the modders know where and how to put the holes per size of battery and type of material?

If I take my SB, for instance, to the drillers shop, what size should be the holes and where should they be placed for best proficiency? How about my Copper Q37? What about my Zenesis? I feel safe with my Reo Grand, but is there something I need to know there too?

If AW-imr's don't expel gas, then why are they dangerous?

In all honesty, my SB and Copper were made before the battery alert and rules/tips/suggestions thread came to being. My LT has 2 little holes in the end cap that merge into one larger one on the outside, which they had made safer after reading the rules of fair play. I like them all, and use them all as safely as I know how to do, but besides getting out my fence post auger and drilling them a hole to remember by, I'd like to do it the right way, in the nicest way possible.

Where do we learn about this stuff? I've googled. I've asked.
1. How much gas does an 18650 expel if an 18650 should expel gas? Is it more than 3mm worth of space full?
2. Do aw-imr's expel gas? If not, then why are they dangerous in an un-super-vented mod?

Just curious about what and how I can change things myself, including being more on the alert in future purchases.
sign me grumpy in a heat wave and I aint' apologizing no more to anybody anywhere anyhow.


ooops, sorry.
 

rolygate

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....... ........ This has had me confused for quite some time now. Perhaps my questions should be in another thread, but sheesh, while we're on the subject....
1. How do we, as consumers, know the formula for size of airholes per size of battery and type of material?
2. How do the modders know where and how to put the holes per size of battery and type of material?

If I take my SB, for instance, to the drillers shop, what size should be the holes and where should they be placed for best proficiency? How about my Copper Q37? What about my Zenesis? I feel safe with my Reo Grand, but is there something I need to know there too?


Our safety guide is here:
http://www.e-cigarette-forum.com/fo...-ecf-metal-tubemods-safety-specification.html

It only applies to metal tubemods (tubular metal APVs) that can accept two batteries and have no electronics. There are two key points to the gas venting arrangements:
- The total cross-sectional area of the vents is 600 mm2 (600 square mm).
- The vents need to be spread from the top of the tube to the bottom, as pressure could rise at any point - but pressure relief at the top end is the most important.
- It's not hard to mill the slots that are suggested, in a machine shop (we had a quote for $6 per unit for example); at home in a garage workshop then a drill press could be used instead, to drill holes. You can get DIY versions to clamp an ordinary hand drill into, the strongly-built ones in heavy cast iron work just fine (often painted blue). The cheap ones in bendy plate are no good.
- Make very sure indeed to break all edges, especially internally - this may require what we call a 'whizzer' - an engineer's drill hole edge breaker, it's a tool with a rotating end tip that can break an internal edge (remove the burr) from the outside. It's a cheap hand tool. Mind how you use it though, it's one of the best tools there is for slitting your thumb :)

I haven't worked out what that cross-section would equate to in holes, in inch drill sizes. Maybe someone can do that.

The holes need to be at the top and bottom of the tube if not spread out equally.

If AW-imr's don't expel gas, then why are they dangerous?

All lithium cells outgas in the event of severe failure. The thing is, with Li-Mn cells (like AW IMRs) there is less gas, and it's slower. At the opposite end of the scale are primary Li-ion batteries (ordinary, non-rechargeable unprotected lithium cells - 'camera batteries'). Stacked and cooked, those put out a lot of gas, very fast. They can explode themselves, without needing any case around them.

In all honesty, my SB and Copper were made before the battery alert and rules/tips/suggestions thread came to being. My LT has 2 little holes in the end cap that merge into one larger one on the outside, which they had made safer after reading the rules of fair play. I like them all, and use them all as safely as I know how to do, but besides getting out my fence post auger and drilling them a hole to remember by, I'd like to do it the right way, in the nicest way possible.

With one battery, and if you know it's a genuine IMR, then there isn't that much need to worry. All explosions have been in metal tubemods with two cells in series and no electronics. If it's not a tube, or has one battery inserted, or has some electronics, then statistically there is no need for concern as there is no history of explosive events. However it doesn't hurt to drill some small gas vents because all devices experience battery meltdowns, and some gas will be produced. But, if you are using two batteries in a mechanical or basic electrical APV - then you need to take care.

Where do we learn about this stuff? I've googled. I've asked.
1. How much gas does an 18650 expel if an 18650 should expel gas? Is it more than 3mm worth of space full?
2. Do aw-imr's expel gas? If not, then why are they dangerous in an un-super-vented mod?

1 - Umm, a genuine AW Li-Mn *probably* won't expel too much gas too fast that it would cause any problems unless the APV is totally gastight. A few holes top and bottom would be enough in that case. If the battery turned out to be a fake, though, it would be another matter - an 18650 unprotected Li-ion is a different proposition. Much more gas, much faster.

2 - All lithium cells outgas in a total meltdown situation. A totally gas tight device isn't a great idea even with the safest battery, since there are fault conditions that mean the circuit is made and stays made (switched on). In that situation, probably everything except maybe the best quality Li-FePo4 will go into meltdown.

The main problem is that nobody really knows what batteries they have. The label might say 'AW IMR' but that's just a label. There is a big industry counterfeiting batteries - they buy junk reject batteries, strip the label off, and re-cover them with whatever sells best. You'll find people trying to buy cheap AW batteries - but there are no cheap AW's, anything cheap is a fake. All AW's sold on Alibaba are fakes. Seen any cheap Ferarris around?

So: with one battery, some small holes might be enough, assuming the battery isn't a fake. With two in series (and no electronics) you need to do the job right and not take any shortcuts. If it's a boxmod or something then statistically there is no issue.
 
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Uma

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Thanks so much for your detailed reply, Roly! You've managed to quiet my nerves and I hope any others too who many have had the same questions. I never stack, and my batteries are expensive, but I'll be adding a small air hole or two to all my mods for "just in case". Thanks also for the tip on how to diy them myself. I wondered about the burrs and how to get rid of them after drilling. You read my mind!
 

dannoman

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We had this product exactly 4-5 days.

When I was informed there was concern I contacted SMOKtech. They told myself and Chris, badkolo, who is the other owner of GotVapes, that the mod vented though the threads and there was space where the firing pin entered the bottom of the mod that they felt provided venting capabilities. As Roly stated there are many mods who have these same sort of safety caveats and there are many other mods that also do not have venting holes. Is that good? Absolutely not.

In the meantime I was in the middle of a very busy shipping day. I completed the days orders and immediately came back to the forum and put up an official notice that we were removing all of the Telescope mods from the site, not fulfilling any outstanding Telescope orders and were directing any who bought the units to return them for a full refund or store credit (their choice) and to compensate them for the hassle and to also help incentivize them to actually return the units, we offered a 25.00 store credit plus their cost of shipping the unit back.

Overnight (this was all occuring this past weekend) SMOKtech contacted us and told us they were remilling the bottom tube to include vent holes. I then made the announcement on our forum that they could return the bottom tube, we would still give them an additional $25.00 store credit and added to that would be the cost of shipping the product back. Or, if they just wanted to return the whole thing back for a complete refund, we would do that too.

GotVapes did move pretty quickly on this. We were not more concerned with our bottom line as though we are some evil corporate scoundrels - and it is completely irresponsible for individuals here in ECF to suggest this. I really, truly, wish this rhetoric would stop. Chris and I run basically a mom and pop vapers supply store, we are not Fortune 500, we are fellow vapers. We LOVE and have an enormous amount of respect for ECF adminstration. THIS is the way a forum should be run, I am constantly in admiration with the way they do things here. But not only that, we care for our customers and it is witnessed by the incredible amount of time we spend in our forum giving personal advice and answering all questions as soon as we can. We are there almost literally, 24 hours a day, 7 days a week, 365 days out of the year.

And yes Whiskey, we are going through our sales records for those first 3-4 days and not only will be emailing them, in case they haven't seen the announcements tagged in all pertinent threads but a thorough sticky announcement, but we are calling them also. We have already contacted many.

During this time I also contacted Roly to ask if there was a an EMSS specification in a PDF document or some such that we could send directly to SMOKtech. Roly responded he would get something to me as soon as possible.
 

dopeh

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backpedal.gif
 

Rocketman

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- The total cross-sectional area of the vents is 600 mm2 (600 square mm).

I haven't worked out what that cross-section would equate to in holes, in inch drill sizes. Maybe someone can do that.

Got ya !
I don't know about metric sizes :)
but for 600 square mm converted to the English system:

A 1 inch hole is not big enough.
16 0.25" holes are not enough.
64 0.125" holes are not enough.
600 0.040" holes makes it with a little room to spare

Whoops, error, need more than 600 0.040" holes, my bad.
(about 740 0.040" holes)

It's easier to figure for slots.
A one inch wide, one inch long slot is close.


This metric system stuff is confusing :)


and I almost forgot
+1 to GV
 
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zoiDman

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Backpedaling is relevant to this discussion.

Your entitled to your Opinion.

I think gotvapes acted Responsibly. And I can't remember another Retailer giving End Users $25 for their troubles over something like this.

Why don't we focus on moving Forward to Ensure that Mods in the Future are Safer.
 
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OCD

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I will mention again because no one has listened yet and maybe one of the mod makers will pick up on it. Use a corrugated liner inside of the tube so battery swelling cannot close off the path top to bottom of the mod then vent out the bottom away from the users face and hands. Slots no matter how big are still high risk because they expose the users hands to hot gasses and they offer greater exposure to batteries to water or damage by other mechanical means.

It would add only a small amount to the diameter of a mod and many people would buy it for its added benefit of safety even though it is a little fatter than the slim sleek mods that could potentially seal from battery swelling.

As far as the backpeddler being a popular VF meme I have only seen it posted once there and on this same subject.
 

rolygate

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I don't know about metric sizes :)
but for 600 square mm converted to the English system:

A 1 inch hole is not big enough.
16 0.25" holes are not enough.
64 0.125" holes are not enough.
600 0.040" holes makes it with a little room to spare

OK I ran it backwards, in metric, as that's easy:

We need 600 mm2 cross-sectional vent area.

Slots need to be 3 off, 4mm wide x 50mm long (= 600 mm2).

Solve for 4mm drill holes: how many 4mm holes are needed to equal 600 mm2 ?

Area of a 4mm hole: area = pi r 2 = pi x 2 x 2 = 3.14 x 2 x 2 = 12.56 mm2

600 / 12.56 = 47.7 holes with a 4mm drill

Let's go to 6mm (~1/4") as 48 holes is impossible

Area of a 6mm drill hole = pi x 3 x 2 = 18.84 sq mm

600 / 18.84 = 31.84 holes are needed

Maybe my maths is faulty, I know it's not that great - but if it's right, then 32 quarter-inch holes are needed to equal 3 slots of 2" x 5/32". It would need to look like a pepperpot or a pistol suppressor, riddled with 1/4" holes, just to equal 3 slots. This is one of the reasons why slots are a good idea: they are far less obtrusive. If they are filled, which isn't difficult, they virtually disappear. Also much easier to make waterproof.
 

Rocketman

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So using both an American calculator (microsoft windows) and a UK calculator, a few 1/8" (3mm) holes are eye candy.


But guessing that a single somewhat short path and vent to atmosphere with a cross sectional area equal to or larger than the vent at the top of a cell (about 16mm diameter for a 16mm cell) would not develop an internal pressure higher than the bare cell exposed to the atmosphere.
Now that would include any obstruction at the top of the cell, along the sides and to atmosphere. A 16mm cell would not likely have a venting area in excess of 200 square mm.
An 18mm cell about 250 square mm.


Limited to only venting, not exploding cells as an explosion dV/dT does not need any containment.
 
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