You can by the adaptor from here for FX cylinder https://www.bestfittings.co.uk/shop/...inder-adaptor/
Well after reading this most informative thread I’ve come to the conclusion that I will not in any way shape or form buy an after market cylinder for my HW100KT. Here’s me almost ready to press buy on evil bay sod that for a laugh.
Thank you you may have saved some one from serious injury.
Dear Air Gun Shooting community
As we supply this item we like to take part in this thread to answer any questions and myths that seem to be posted here.
The tube that failed may have been deformed,weakened due too either shipping, or the ends were fitted using a vice. Thus resulting in crushing of the cylinder when the tubes ends were fitted. The valve end should be fitted using a 8mm bar in the fill port, and a socket/spanner for the valve end. It should never be tightened in a vice. After this problem was brought to light we upgraded the fitting instructions, placing the fitting sheet around the tube, so this information could not be missed, instead of inside the packaging. Also the shipping has been upgraded to avoid any damage in transit.
We have a testing certificate from a certified testing facility of 650 bar, with rapid evacuation, and rapid refill in a 10 times cycle, with no deformation over a quantity of tubes. This is the most extreme testing you can have, as advised from the testing centre. As you are no doubt aware filling slowly,and exhausting slowly should be done in a controlled manner. The testing house inspect items on a daily basis (as you can well imagine). We have been in contact with them and the manufacturer.
In light of many potential factors of building up the unit, eg: having correct tools, fitting experience, and indeed testing capabilities once the unit has been built by the end user we are now not selling the "tube only option" to the general public. This option will only be available to accredited outlets that specialise in this field.
With over 100 tubes sold this is the only known failure. We have had a return with marks on the tube, that occurred in transit. We asked the buyer to not use the item, to return, and we replaced the tube. Upgraded packaging, and shipping has resolved this issue.
We fill every tube to 260 bar in house before shipping, and then step back to 100 bar over night too check for leaks.
We take the highest level of care, and caution from manufacture, testing, storage, packaging, and shipping to produce a safe, reliable Fenton product for the end user. We welcome any feedback from the shooting community to improve our product. Any feedback received we will certainly take it on board to help future shooters and current customers.
Best Regards
Fenton Shooting Supplies
Are you confirming the split tube is yours then? If you are then your certificate does not seem to be worth the paper it is printed on. Again IF the tube is yours I would be considering contacting your certicate house for comment.
Also could you confirm Grade of Aluminium you use and wall thickness.
thanks
Goat
Dear Goat
I have contacted the manufacturer for specification clarity.
Your figures state a wall thickness of 3.5mm in fact it is 4.3mm wall
Material tensile strength is 245 Minimum MPa
Using Barlow Formula you can see a 650 bar without deformation is easily achieved. We did not test to destruction as 650 bar is over double that the tube is rated at. Hope this helps allay any concerns . Any questions get back to me and i can contact the manufacturer further for you.
If the tube that we are talking about is indeed one of ours as this is all hear say though general conciseness and feel from this thread is that it is. How the tube split? is a good question!
Regarding your comment on the test house results.Why would we question a expert in there field in their test results? Who provided full certification? We are not experts in this field are you?
Hi thanks for the reply.
You quote a wall thickness of 4.3mm @ a tensile strength of 245MPa. With these figures I get the deformation pressure as 569.5bar. While I completely concede that this is more than double the working pressure for normal operation, my problem is that on your listings you mention "Rigorously tested & certified to 650 bar with Rapid evacuation and rapid refill in a 10 times cycle, with no deformation or loss of structural strength recorded." This statement flies directly in the face of the 569.5bar deformation pressure calculation using Barlows formula. As scientifically it will deform at 569.5bar.
The answer your question "Why would we question a expert in there field in their test results?" Well, perhaps the fact that one of the cylinders split from end to end at 150bar? I would certainly be questioning them on both counts. You don't need to be an expert to reaslise that there is something wrong when tubes tested to 650bar are splitting at 150bar, do you?
regards
Goat
Last edited by Goatofmendez; 20-12-2018 at 05:07 PM.
Look down inside the tube against some light with ends off for us to see if it separated along the inner seam/weld.
Weihrauch used to tighten up the ends like stupid tight in the factory.Probably that’s why people think it must to be done tight like crazy... but o rings do not deal/work that way.
The truth is the ends can be left quite loose, once pressurised you can’t undo the ends anyway. It’s fine to have it hand tight definitely easer to go in again later if need to for slow leaks etc.
If you want high shotcount buy a different gun, there is a multitude of choices these days. As I said put the funds towards a different modern make instead, will benefit more
Take care
Last edited by krisko; 18-12-2018 at 05:27 PM.
I appreciate much You answering in this thread and express Your position.
I now ordered a complete carbine cylinder on amazon.
https://www.amazon.co.uk/gp/product/...RVBDHM05&psc=1
I will test Your cylinder on my HW100KT and post my experience in this forum after christmas.
Last edited by Luftgewehr100; 18-12-2018 at 07:56 PM.
Does anyone know what happened to the (blown up)cylinder, has it been sent off anywhere for inspection,investigation ect.
1 Rapid+sentinal n/v, 1 HW100+ Mamba lite
We have asked the question to the manufacture with the reply.
On visual inspection if you can see vice marks on the diameter then a crushing force was used via a vice (most would use wood blocks so not to leave marks and damage the finish) so no marks would be visible.
Over filling without viewing the customers own gauge they fitted and reading off the scale they would be reluctant as you can expect to give the supplier this. If looking for a refund on the item.
Over tighting. As a previous poster has posted the standard cylinder supplied via Weihrauch the gauge end and valve end are usually very tight to remove giving the impression they should be tightened up to this high torque when refitting, high torque is not necessary as the air in the chamber will seal the fittings in place. High Torque can twist the cylinder and weaken its structure.
Crossing of the threads Damaging the Valve / Gauge end when striping the old cylinder or corrosion resulting in the ends being very tight to screw up and using large amounts of torque. The thread would not be able to be checked when split open customers fittings/they would be reluctant as you can expect to give the supplier this. If looking for a refund on the item and aware they were hard to screw in.
This is one the main reasons we have stopped selling the tube only option there is too many factors to go wrong, having the right tools / experience / and safe way to test the cylinder after being built is a risk we are not willing to take. We sell them to Gun shops that are qualified to take the task on. However we feel it is too dangerous. We would like to see other suppliers follow suit or offer a service where they can send the tube to be changed at there facility so it is correctly done and checked safely.
Our complete cylinders are built tested to 260 bar in house before shipping, and then step back to 100 bar over night too check for leaks. Item will arrive to the customer with 100 bar present. If this is not the case then the tube should not be used due to damage in transport or a leaking issue. There is no need for the customer to take or alter anything on the cylinder and taking the cylinder apart can be detected by the manufacturer when sold as a complete unit.
Hope in anyway this can help.
Best Regards
Fenton Shooting
Last edited by Fenton Shooting; 19-12-2018 at 04:33 PM.