The evening times. [volume] (Grand Forks, N.D.) 1906-1914, 1913-12-06
49, y 49, N'W 80. 7..EH.' =
CITY BOILERS
DECLARED Q r.
Report on Test Submitted to
City Council Friday
Night. - ;

The two boilers recently Installed
by the city at the municipal water
and lighting plant are up to standard
as regards both capacity and efficien-
cN, according to The report submitted
by the testing committee to the city
council Friday night.
The report is signed by. CA.
Thompson. Charles. McIrarlen, and J.
ID. johnson, the committee appointed
is complete. except for the report On
the coal analysis which is being car
ricd IN at the state university.
Representatives OF the companies
which, had supplied the boilers were
present, and were cross examined bN
the solons. They answered all ques-
lions in a satisfactory manner, how
ever.
Tho test of tho report made by the
committee follows:
TO tho Honorable Mayor and City
Council:
Your committee appointed to run
tests on The new Scotch marine boil
crs at the city light end waterworli
plant be.s to make the following re-
port:
Ono test was run December j. rum
ming from $50 to 1920 p. rn., siSs
hours, carrying the full load of the
plant for The entire period. Tha"foad
was carried in h west boilpf with
the second unit banked. i Approx
imately 800 pounds of coal was con-
sumed in the banked furnace.
a second test was conducted De-
cember 4. from 1880 to 1:SO %. nl.,
nine hours. the surplus steam being
wasted until plant load Was put on.
This was 3 capacity test.
Tests were conducted according to
standard practice. Weight and tenn
perature OF food water, weight OF
coal, steam pressure. draft above fire,
fhle temperature Int f]ue gas anal
ysis were recorded. Temperature aud
pressure readings were taken every
for ANALYSIS. The sub-ioincd table
gives dates and results OF tests in
detail,
AS TO capacity tho test on Deceml-
Der . shows 1921 3. RI. p. and
on Deeemher :. 1ss E. II. p. Coal
Tired in the first test was bright, ON
paratively dry. running high in lump.
While THAI fired in the second test
contained considerably more moisture
and a large percentage of dust. being
taken from a. pile which had evidently
been exposed to the weather in the
tee has TO report that under the oper-
ating conditions the CAPACITY of the
boiler tested varies from rs per cent.
to ~ per cent. ahove the rated ca
pacltN OF 100 +. II. p.
The record shows a draft above
water. which lis rather low for this
grade OF coal. A higher draft would
have shown a higher cnpacity. This
is. Of COURSE. u to the excess area
OF h chimney for the load carried.
and air leakage through the onnec
ton to the Heinie boiler. which is
not completed.
This low draft accounts for the low
flue gas temperatures.
The evaporation III the first ties,
on the hotter grade OF coal was 81.
water per pound OF coal as fired. on
grafton per pound of dry coal in. the
first day was 9.43, and ON the secon.j
day SOS.
In the opinion Of your committee
this is very good.
The ANALYSIS OF he rlue gas show
per cent Co and less than .157 per cent.
Summing up tire results of the. tests
there can be absolutely no question
about the capacity Of the boiler.
showing A fair overload capacity,
which. no doubt, can be improved
using fo~ugheoughcny screenings.
The plant load is evidently larger
than has been generally. assumed, and
It is not TO be expected that one
poller VIII carry. the peak load. m1.- |
less all conditions are right and a.
good grade OF screenings used, ON
he second test. using u Low. Grade
Of screenings and with a drop of
~ degrees F. in the feed water. from 4
a cause not known to your commit |
tee. we failed to carry the load on
one boiler. AS it is necessary to have
from l0O-ls0 F. II. F.. in reserve 10.
fire purpose. it is Necessary at all times
to have at least 800 3. II. p. available
at All times when the lighting load
that one boiler should he run at full
capacity or as much as the load will
require while the second unit is bank
ca II used to make up the differ
ence. Respectfully submitted.
G. A. THOMPSON.
CHAS. McF"ARLEN.
j. D. JOHNSON.
Committee.
To say. vnu wont Commit ,->,-.,s