Pressure testing for buffer tanks

[woody]

Paul ... I didnt suggest modifying the bottle .... other than the removal of the valve.

A suitable fitting in a standard fire extinguisher cylinder will easily supply enough flow for 2 Bukert Valves.

http://www.luxfercylinders.com/products/http://www.luxfercylinders.com/products/
For a look at specs / types.

[tunna]

Paul you lucky sod

[killercarrot]

Right, decision time. I can either rebuild using a 100x125 16bar norgren ram, which I already have, and buy a couple of 20 bar 2/2s and a bigger regulator lets say £250... or I can use the 135x50 I have and buy some HP 2/2s a small reg for the down stroke and a 3/2 for about the same cash.... watching a variety of low and HP machines on saturday, Im not so sure as to the route to take, I dont want to build a completely mental gravity like thing, but would appreciate a bit more power. running the calcs through Noels spreadsheets things come out pretty even.... I hereby start the Low pressure high pressure debate.

[tunna]

Nothing exceeds like excess!!!If you cant stand the Pressure well you know the rest!!!

[m2xt]

Following a brief review of the PED with Daniel and Adam from Team Mute, the current thinking is as follows for pressurised vessels in 1000 psi / 69 bar max robot applications:

1) A vessel with a volume equal to or less than 1 litre must be designed and manufactured in accordance with the sound manufacturing practice of the EU country of origin and be marked with the manufacturer.

Vessels with a capacity greater than 1 litre are treated in one of two ways:

2) If the volume (in litres) multiplied by the pressure (in Bars) is less than or equal to 50 Bar litres, then paragraph 1) above applies. For example: max woring pressure 16 bar, max volume 3.125 litres.

If the Bar Litres is greater than 50 but less than 200, the vessel requires a CE mark to Cat 1.
The prototype ruling may be a way around this CE Cat 1 requirement. I do not consider myself qualified to advise on this one but reading the text suggests that if you have to purchase the vessel from a manufacturer, then it should meet the PED requirements.

Regardless of any of the above, pressure testing / certification apply.

I would welcome any comments on this text.

Paul

[m2xt]

Rob, assuming your HP ram is 50mm bore, I would stick to your 100mm bore LP gear, you have the potential to get a greater performance.

Ultimately HP will win on outright power but that does not guarantee a winning machine. You need to decide on what performance you require and that in turn will influence whether you go LP / HP. If you are happy with lots of 1m high flips then LP is fine, if you want 3m high flips then LP is struggling and you are best going HP.