On 7/27/12 3:42 AM, Kristian Ukkonen wrote:
On 7/26/2012 18:40, Morris Dovey wrote:
The first part needed is a stainless steel containment vessel, the
second is a manifold block incorporating a gas passage and provision for
four solenoid valves and a pressure sensor, and the third is a
mechanical linkage between a motor and the handle on a standard bottled
gas pressure regulator.

The containment vessel and the manifold need to be able to withstand
pressure to 3450kPa/500psi and temperature to 500˚C/932˚F.

It is a pressure vessel so in US you need to make it
according to ASME code (unless exempt by size or such)?
That includes design, manufacture etc..

Otherwise, AISI 316 is a good material used in pressure
vessels at those temperatures and pressures (atleast in EC PED),
if the corrosion properties are ok for the application and it
is OK for ASME at that temperature etc.. Metal C-rings work
fine if seals are needed (for example, inconel 718 c-ring).
Seal design (and bolt design for keeping the seal intact) is
part of the pressure vessel calculations too..

In PED maximum round rod size is 250mm diameter, after
that you have to use a forging.. Check what the code requirements
are.. At least, material must have appropriate material
certificate..

I'm not sure of applicability to a personal experimental apparatus - but
have been looking at this 316 tubing


http://www.onlinemetals.com/merchant... 902&top_cat=1

for the containment vessel shell, which is listed with a 6720psi
bursting pressure; and


http://www.onlinemetals.com/merchant... 902&top_cat=1

for the heater well, which has a bursting pressure of 16800psi, but
which will be subjected only to compressive forces.

The C-Ring seal suggestion is /much/ appreciated and I'm planning to see
what other metals are available (since Iconel is primarily a nickel
alloy and this particular reactor considers Ni to be food). :-)

--
Morris Dovey
http://www.iedu.com/Solar/
http://www.facebook.com/MorrisDovey