RE Coal stoves needed 2

["Crispin" <crispin@newdawn.sz>]

Dear John

I will be at the airport at 5 on Saturday but I don't think we will get
together this weekend - too much happening with getting 10 stoves (min.) to
David Hancock and Marlis for Monday.

>It is good to know that such cans are available. What are the dimensions ?

I am copying this to the group so people know what is on offer.  This is not
a comprehensive list, but are common enough to warrant listing.  All the
cans are measured in inch sizes but I know them by their metric equivalents.

Cans are measured in diameter, wall thickness, total height, and inside
height which is the total height less the inward bumped bottom and the lid
thickness.  A typical description is 25/0.45 which means 25 litre 0.45mm
wall thickness.

There seem to be 4 standard wall thicknesses and many cans can be ordered in
several of them.  They are: 0.3mm, 0.38mm, 0.45mm and 0.6mm.  An experiment
with 0.2mm stainless steel 5 litre cans is being conducted in JHB at the
moment to see if they weld properly.

5 litre paint cans are 178 in diameter, and about 205 high.  They are
parallel sided.
10 litre cans (the newest ones) are 287 in diameter at the top and have
parallel sides, with a tapered bottom 85mm. The bottoms are one size for
many volumes: 273mm.
20 litre cans are parallel sided and 287 in diameter.  Parallel means that
most of it really is, but the bottom 85mm is tapered down to 273.
25 litre cans are parallel 287 (with tapered bottom 85) or else continuous
tapered 287 to 273.  They are 455mm high.  You can have bumps (swages)
wherever you like.  I have them at 75, 150 and 235 from the top.  Oil cans
often have one 85 from the bottom.  Paint tins usually have only one at 180
from the top.  The wall thickness is 0.38 standard and 0.45 on order only.
36 litre tins are actually used mostly for making floor mop buckets.  They
are 354 in diameter and short (to suit 36 litres).  It has parallel sides.
This 354 is a standard diameter for all the larger tins.
The 40 litre tin is 354 in diameter and parallel sided.  It is 455 high.  It
is also uncommon.  I only obtained one with difficulty and cooperation but
they can be ordered.
The 50 litre is 354 in diameter and 560 (or so) high outside.  It is 0.45
thick and looks huge.  I paid R43.50 for the 50 lit. and the 40 was a little
more - about R45.00.  It is a straight taper.
The 50 kg (different size) is a little taller.
The 60 kg one is the type the HTH pool chlorine comes in with rectangular
bumps (swages) giving it superior rolling characteristics with a heavy load
inside.  The 'ring' is patented and they are not allowed to sell that
container to anyone else.
The 210 litre drum is a standard oil drum.  They are available with a screw
in hole closure of an open top with clamp ring.

To give you an idea how much they cost, a 25 litre 0.38 wall tapered tin
with 3 bumps, a handle, a bottom and a loose top with a clamp ring costs
about $2.90.  That includes a painted exterior as far as I can remember.

>At the moment I am striving to develop a replacement for the embaula

I feel that the 50 litre can is high enough and robust enough to make a
viable coal burner, through it will still probably have to have a chimney
for extra draft, at least one pipe (1.2M long), perhaps on the side.

I have faced the same problem you have: the coal will not give off useful
heat without draft.  We only have local semi-anthracite.

Your 150mm diameter model should work better than the 100 dia because it is
easier to keep the coal hot when there is more of it.  But I think it is
still too short.  Try the 50 litre can and a side chimney.  Contact Rheem at
21 Potgeiter St, Alrode.  Actually you would probably be better with a
smaller diameter than 150 because you will struggle to get the air to feed
into the centre, I think, with a low draft.  How about 125 and lots of
preheating?  It will have to be stainless.  Why don't you buy a 3CR12 grate
from me.  I can leave one with David Hancock (who is moving to PTA this
weekend).  Or RUTEC at 58 Marshall St., Marshalltown.

Pre-heating the primary air (which Paul has achieved nicely with the Juntos)
will increase the total draft in whatever height you have.  I think with
coal you should be able to get 250 to 300 degrees.

Thanks for the invite.  I show certainly drop in one day.  I think I still
have some directions you emailed to the group.

Let's clean up Daveyton!

Regards
Crispin


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