Author Topic: UK machinist recommendation  (Read 17432 times)

Offline bry1975

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Re: UK machinist recommendation
« Reply #25 on: June 02, 2011, 05:44:22 PM »
Thanks David,

Some interesting information there.


Bry

Offline David Jupp

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Re: UK machinist recommendation
« Reply #26 on: June 05, 2011, 03:45:23 AM »
I should also have mentioned - within the EU such a chamber would fall under the scope of the Pressure Equipment Directive. 

Fortunately when the working fluid is a liquid that is neither explosive, flammable, toxic nor oxidising; then the chamber would fall into the 'Sound Engineering Practice' catageory  as long as
Working pressure < 1000 bar
Working pressure x volume < 10000 bar.litres
(full description is slightly more complex)

It therefore MUST NOT be CE marked, there is no requirement to involve a Notified Body in reviewing the design or inspecting the finished item.

The 'manufacturer' is held liable under the Pressure Equipment Directive, so anybody with any experience of pressure systems would probably want to know the categorisation of the chamber and see some design calculations, or know which code it is design to meet, before they would undertake producing such an item.

Offline bry1975

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Re: UK machinist recommendation
« Reply #27 on: June 05, 2011, 08:41:16 AM »
Thanks David.

Offline David Jupp

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Re: UK machinist recommendation
« Reply #28 on: June 06, 2011, 09:45:54 AM »
Bry - I've asked a company that does a lot of high pressure work about this.  The company is Stansted Fluid Power, based in Essex.  Their Sales Director is optimistic that they could offer something straightforward that would meet your needs.

To give a quote they'd need to know required internal diameter, if a window is required and any other features needed.  It wouldn't be cheap, but they would try to base it on their standard designs of lab pressure chambers, so hopefully very little design effort.  It wouldn't have a bolted closure.

For PED purposes they would need to be clear what the working fluid is (simpler if just a liquid, gas over liquid may lead to complication depending on volume).

If you want to follow up, I'll pm the contact details.

Offline bry1975

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Re: UK machinist recommendation
« Reply #29 on: June 07, 2011, 03:44:13 AM »
Thanks David.

Probably be to expensive for my pockets but will certainly contact them for advice.

Bry