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Resident 'Precious Specialist'
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Discussion Starter · #1 ·
I've just had 2 Tor Tek cylinders failed from a LDS. The cylinders are about 5 years old bought from NEC Dive show, they have been used only about 40 times max. They failed due to not being able to screw a measured thread into the neck.
The cylinders passed a Hydrostatic back in 2004.
Has anyone had a problem with these cylinders or heard of this before, I can imagine if the thread was slack fair comment but to be to tight?
Does anybody have the IDEST web site to see what sort of testing instructions are given.
I am going to contact Tor Tek for advice, but should this have been picked up on the Hydrostatic in 04 and apart from being sat in the garage most of the time what has caused the threads to stretch? they was stored full for a few months but I wouldnt have thought this would cause stretching?
All answers or help would be much appreciated.

Cheers Preciousssss!
 

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From my experience I always hated testing Tor Tek cylinders because, as you stated the threads on the cylinder. I found them to be of poor quality compared to the likes of Faber. So maybe there was good reason to fail em.

Just me tho.

Ian
 

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There have been a number of Tortec cylinders failing due to manufacturing problems. If you remove the handle and look at how the neck is formed, there are some which are offset from the centre of the cylinder.
When the neck is machined the hole is offset, then when the tap cuts the thread you get a full thread on one side and very little on the other.
Therefore when it goes in for test the go gauge goes in ok the no go goes in ok but it fails for not having a thread of full form.
 

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Proud to be "small minded" in the face of credulit
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The most common reason for cylinders to fail is the go/no-go test on the valve thread. It's a valid test, in that it looks for thread stretch.

The 'gauge' has a thread on it which varies in its pitch along its length, so that it should screw into a cylinder, but only so far.

If it doesn't go far enough, or goes too far, the cylinder fails because the valve thread has become distorted for some reason. If this test weren't carried out, stories of valves shooting off the top of the tanks would be more common than now.

I'm afraid I have no idea about the manufacturer's reputation, but the testing sounds correct.

Regards,

Mark
 

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Discussion Starter · #9 ·
Thanks for the enlightenment chaps its becoming more clear now as to whats involved in the testing. What is the jist on getting the cylinders threads re-cut? worth it or not?

I'm tempted to contact Tor Tek (if I can find an address) but as the cylinders past the first Hydrostatic they will no doubt claim their was nothing wrong from the factory, otherwise they would have failed then.

Cheers Preciousss!!!
 

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Proud to be "small minded" in the face of credulit
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Thanks for the enlightenment chaps its becoming more clear now as to whats involved in the testing. What is the jist on getting the cylinders threads re-cut? worth it or not?
I'd bet not. I don't know what the regs say about helicoils, but I'd probably bet they're not looked on favourably.

What I would bet is that the cost of putting inserts in makes it a bad option.

Sorry for the bad news, try not to be too g(ol)lum.
 

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Smeagol
Your best bet is to contact your local trading standards.
Get them to talk to Lancashire trading Stds as the importer, I gather was from that area. somewhere close to the M6 with an inland pier
Do you still have the cylinder or did you get it back from the test station?
That would be useful to show the officer and explain the prob.
 

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Discussion Starter · #14 ·
The cylinders where bought at the Dive Show about 2002/3 so Im not sure if the trading standards could do anything, they have already past a hydro test in 2004 so can see the "well it past then it must be something you've done since" excuse coming out,although they've been sat in the garage apart from the odd run out to Stoney ,Capers and 8 acre.
The ruling at the LDS is if the cylinders fail they have to destroy them I assume this will count for all IDEST places although he has agreed to hold them for me untill I can find out if they can be re threaded. I've seen info on the web that says your allowed to do certain work but no clarification as to what exactly, so if anyone happens to read Cylinder Repairs Monthly please pass on the info.

Thanks for all your help chaps its much appreciated

Cheers Preciousss!!
 

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Dont forget they are still your cylinders so you can get them back if you wish and they cannot do anything yo do not agree to to thm either. If they throw a hiss fit tell them you wish them for evidence to passon to trading standards in regards to the bad threads or alternatively get a lawyery mate to ask for the cylinders back in writing. You could put this up against a car though. just because itfails it's MOT does it mean that the garage is legally allowed to take ownership of the car and destroy it without your permission?

just some thoughts, good luck. If mine failed test I would like the cylinders any way just for the scrap value!
 

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YDs Most Southerly Monkey
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I know they recalled a whole batch of Luxfer cylinders here due to cracking. I took one in for testing for a mate and even though it was several years old, when the LDS found the cracks and failed it, they offered him a brand new one for 30% of the normal purchase price.
 

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At the place here you have to sign a piece of paper that gives the test station the right to scrap the cylinders should they fail. As I understand it they don't charge you for the service and recoup the cost to them by selling the scrap metal. In the case where you pay and keep the tank I think they may be obliged to put the tank beyond use (drill a bloody great hole in it or similar) but I'm not at all certain on that.

Ben
 

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Dont forget they are still your cylinders so you can get them back if you wish and they cannot do anything yo do not agree to to thm either. If they throw a hiss fit tell them you wish them for evidence to passon to trading standards in regards to the bad threads or alternatively get a lawyery mate to ask for the cylinders back in writing. You could put this up against a car though. just because itfails it's MOT does it mean that the garage is legally allowed to take ownership of the car and destroy it without your permission?

just some thoughts, good luck. If mine failed test I would like the cylinders any way just for the scrap value!
When you take a cylinder in for testing you sign a document agreeing to the cylinder being destroyed if it fails it's test. You cannot take it away if it fails, it must be destroyed by one of a number of ways as laid down be the HSE. Drilling holes in them isn't a recommended method.

Phil
 
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