The Hawaiian gazette., 1915-10-26

loaded or to harvest cane where 1t has
to be packed up HILL On level land or
harvesting above a fume any kind Of
labor can do it, but to lift it we must
have bumpers '-laborers who arc
physically strong men--to stand tho
strain. This is where a mechanical
aume il going to be available. "
Laying the Cane Straight
! Mr.. Hind said another problem is to
lay the cane straight on the cars in
stead Of dumping it in loose. JOIN
Hind and James Ogg are now at worl
on BATTLE plate invention which vii
take the cane as it comes out of tn,
"dry fume' and lay it straight in tn
| cars.
| W. W. Westcoat said he had meas
ured cane piled loose and laid straight
BY laying the cane straight twenty pc.
cent more can be carried in a car. 20
Replying to a suggestion that tn
whole problem could be simplifed b,
chopping the cane into short lengths a.
it is cut, R. S. Norris said there woulc
be danger of its souring, and much
cane would be lost in transit to the
mill
New Paia Evaporators
j. Meinecke then read J. p FOSTER
report on the new Paia quadruple Of
feet. The first question raised was OF
the length and diameter of the tubes
Charles COwan said short tubes are b.
all odds the best. W. G. Hall said tn
factor controlling the length of tn,
tubes is again the fact that the labor
ers are short in stature. The averag'
laborer cannot clean a tube 66 inchr
long unless he has mechanical aid. 81
there were only some sure way o
cleaning them we would rather use
Gve7eighth,inch tube. Big tubes .hav'
"cOld core that is, the liquid mex:
the metal is hotter than in the cente:
Mr.. Hall said "cleaning and drain
ing are far more important point.
than any engineering construction il
building an evaporator.
|, L! 'Kopke spoke of the "splasI
height as factor influencing tn
length of the tubes from the theoreti
al standpoint, but practically til
pace available for cleaning the tube
$ more important.
How to Clean Tubes
This lead up to the question of tn
Dest way to clean the tubes. Alter
late soaking first with "beer' o,
lilute fermented molasses, or Othe
weak acids, and then with caustic soda
was held to be the best nonmechanica
method of loosening scale. Horac,
Johnson said engineers must give
'nough steam to do this work as tim
md the strength of the caustic sod
solution used are the important things
1t was brought out that at Wailukr
when caustic soda is added to tn,
aw juice no scale forms, but this meth
I'd tried elsewhere has not worked
R. s. Norris said he knew Of no goot
reason for this but it might be that
he acidity of the juice kept the salts
which form the scale, in solution un
I'll they get to the last cells Of thu
'vapOratOr. The caIstic applied to
he raw juice probably pr"riPitater
he salts earlier in the boiling process
Mechanical Cleaners
Doctor Norris thought disadvantag'
VI too long tubes was the water film
that forms on the steam side p.
Messchaest has used wire brush fO
cleaning the tubes. The brush is re
vOlVed by an air motor. He has used
This method for ten years and in that
lime has made only few tube re
Placements, perhaps half Il dozen, all.
told. Il. Kopke suggested air-drlven.
drill head motors and flexible shafts
80 that one labOreT could clean four OF
Ave tubes at once. IT such multiple
drive motors can be devised it wOulr
solve the cleaning problem and smaller
;ubes can be used.
Steam Saver VS.. Evaporation
r. s. Norris called W. G. Hall to
account for the position taken last
week at the chemist = convention on
what an evaporation is for. He dis
agreed with Mr.. Hall on the evapOratol
being primarily "steam saver. 1T
Use is primarily to get rid Of the water
and the loss of heat in the drainage
water from the different cells is un
Important" he argued. Mr.. Hall re
ferred to the loss of heat where thi
temperature varies in the different cells
and still held that the quadruPle effect
Is primarily iutended to economic
| steam.
The drainage of the cells, previously
discussed at the chemist = meeting, and
| its relation to economy Of heat again
brought out much, difference of opinion
Most of the engineers favored using
separate pumps without being able to
explain just why except that it in
ereases the. capacity of the four cells,
Ammonia Pipes
Provision for removal Of the non,
condeHsable gases elected much de.
bate. w. Ebeling said the use of am
monia pipes to draw out these CASE
| maintains a circulatinn nf Van0r and
increases the capacity of the cells 20
per cent. The gases are heavier than
water vapor and if they are not drawn
of, dead spaces" form. The escape
pipes should connect the bottom of one
calandria with the next cell two thirds
Of the distance up.
W. G. Hall attributed the loss in
efficiency where the gases are not re