Hello.
I use silver in my work, mainly I roll plates and draw wire. Often I
need to make silver tubes, half an inch in length, 0.314 inch (8 mm) in
diam and with a wall thickness of 0.0393701 inch (1mm). So I do the
tubing ouf of a silver plate but there are too many operations involved
(rolling, shaping, soldering, stretching), and Id like to make my
tubing at a large scale.

I have made a propane gas burner as in Ron Reil pages and it worked,
and I bought a medium sized crusible for centrifugal casting and made a
centrifuge but my burner wont heat up the crusible enough for the
silver to flow into the mould. The mould I employed was a drilled screw
3/8 and put a piece of 5/16 brass in the centre. Thing is molten silver
stuck in the crusible opening. I guess not enough temperature.

Since I am beginning to experiment with silver casting and keeping in
mind that I will be casting tubing (mainly) I would like to hear your
advice. Any of it sans the advice to quit, I must do this myself.

I tried to use "Alcohol investment" I picked up at a dental store, it
has 2 liquid components and a white powder, but from my first
experiment I did not got satisfactory results, the central piece of
investment(the one that stands for the hollow part) breaks too easily.
But then again I dont have a vibrating equipment required to shake the
investment neither I have a vacuum pump to remove air from the
investment.

Right now it occured to me making a small forge of bricks, stick my
burner in it and put my mould vertically in the centre of the 'forge'
with some silver on the top hoping it will melt and fill the tube like
cavity.

I greately apritiate any of your inputs.

Konstantin.