The Virginia enterprise. [volume] (Virginia, St. Louis County, Minn.) 1893-19??, 1910-12-02
hing but the oil, if any should be lurking

around.
find that the apparatus for driving the
economizer scrapers is not vet put in but
the contractor informs me that it is on the
way and will be put in as soon as it arrives.
would suggest that the part of the
breeding leading from the boilers to the
economizer be covered with asbestos as
specified. in order to get the full benefit of
the ecOnOmizer. The gases should go to
the ecOnOmizer as near the same tempera-
ture as they leave the boiler as possible:
if there is any drop in temperature on the
way to the eCOnomizer that is dead loss.
but after the gases have passed the
economizer it does not matter as then you
cannot make any further use of them.
The piping and pump arrangement is
6ne-anvthing finer would be useless
expense.
Would recommend that you raise the
floor in front of boilers only about 16", to
make it possible for the man to properly
attend to the fires. AS it is at present it is
almost impossible to properly attend to
them.
AS to the proper way of firing that fur
mace. that is too big subject to treat fully
in this report; besides, it is something the
man will have to learn by degrees if he
has not handled one before. But l may
say, the first thing for him to learn is to
leave the fire alone and manipulate his
machine so it will do it's own work except
the putting coal in magazine and taking
out the ashes. Doors should be kept closed
and hooked and slash bars should never
be used except when banking fire or if
large slices of Clinkers should get hung up
(which happens very seldom if stokerS are
properly rum.
The rOuster bar may be used occasional
" through the rouster holes to even the
fire. The magazine should be kept we'll
filled and magazine doors open; then ad-
Just speed of stoker engine to feed the
right amount, and the speed of clinker
CruSher bar should be so set or attended to
that no live Goals are ground down into
ash pit, but fast enough to not allow Clink-
ers and ashes to heap up in center of fur
mace. When your fireman gets so he can
handle the furnace as indicted above there
will be nearly perfect combustion and no
smoke.
Your special committee on light and
power asked me to embOdy in my report
any advice or suggestions might have re-
garding the advisabilitv of putting in
your own generating sets. To this will
say shall not attempt to advise you but
will give you facts and from that you can
advise yourselves.
FlrSt-We gather from your committee
that your probable needs would be total
of $50 II. P. in lights and motors. For this
l should recommend two direct connected
70 X. W. enginc-driVen generating sets.
The cost OF these two sets erected upon
foundation furnished by you) would be
Foundation .......... ...... 200 90
Piping Valve. ETC.. NEUTRALITY-SUSPICIOUS.. 500 90
switchboard ................. ....... 1900 90
Estimate on wiring to lights and motors
cannot estimate as [ do not know how
much of this is now done.
Exhaust from engines would all be used
for heating except such days in fall and
spring when outside temperature is high
enough to require no artificial heat in
buildings. In cold weather you would not
get enough exhaust for heating unless
Your engines were both running and carry
ing full load, which probably would never
occur. so YOU would have to add live steam
to make up the deficiency.
The available heat in exhaust steam can
best be illustrated as follows: If 600
British Terminal units of heat goes to ar,
engine in a given time-say one hour
there being less than Sc less of heat in
passing through engine would leave $4,000
British Terminal Units available for heat
| ing out of the 100000 British Terminal
Units that were delivered to engine. That
is, $50 of the coal burned would be used
for heating and SO should he charged to
the engine for power.
Estimate $4,000 for coal to one engine
SO of $S0O0O.. ..... >. ............. 40 OK
Engine uD-kecp... 100 OO
Extra helP'...''' 1ooO W
Actual cost for power for one year $1I4O &C
Your committee informs us that in the
! new building you have 80 II. =. in motors
and the best rate obtainabc was SC per n
W. hour, with a 500 minimum II. T. pei
| month. If the minimum is applied it
would be $4,000 per month = $o16OOO per
year for power alone at new building. II
You have 20 II. u. at the Roosevelt at same
rates add $4,000, and if equivalent to 80 II.
P. for lights in both buildings were used
at same rate add $4,000 per month = $780, OK
per year. This would indicate a minimum
charge per year for current, $>S4O.0O. Should
you use enough current so the minimum
| would not be applied, so much the worse
for you. Therefore let us use the mini
| mum. $3.50 90
Cost to operate generators ......... 114O co
Net saving on current ........... $500 90
This would pay 60 interest on.... SIS 600
or 1915 on ....... >. 1900
or Z1fe on go. 10000
&c <l,1
estimate of $1,000 90 by $4,000 and make the
plant cost $100oO.O0 even, the plant would
earn 27Go on the investment and would
therefore pay for itself in three years and
nine months.
Would recommend that the A. 6. motors
that you now have purchased be exChang-
rent generators installed, if satisfactory
change can be made with the companies
furnishing the motors. If such satisfactory
| arrangements could not he made we can,
however, install the low voltage general
OrS, which would do the work but not so
satisfactorily as the direct current.
Here we leave you to draw your own con-
any changes in the figures that may ap-
pear to you necessary. Am of the opinion
that no matter how you jugglc them there
is enough to go on to still make good
showing in favor of plant.
Yours truly,
L. A. LARSON.