The Locomotive - Lighthouse Survival Blog

8!te Joc0Wfltte.
PUBLISHED BY THE HARTFORD STEAM BOILER INSPECTION AND INSURANCE COMPANY.
Vol. XXII. HARTFORD, CONN., DECEMBER, 1901. No. 12.
Furnace Arch Bars.
The erection of brick settings for horizontal tubular boilers raises a number of
problems in connection with the expansion and contraction of the walls as they are
'alternately heated and cooled; and if these are not well understood, the settings are
likely to crack and give a good deal of trouble. But if the setting is correctly designed,
there should be no great difficulty in erecting it in such a manner that it will have a
long life, and do good service.
Fig. 1.
—
I /
O
o o o
.£>
Showing the Arch Bars in Position.
BOILER
There is one part of the setting, however, which offers special difficulties, and which
is forever getting out of order, if it is not put in carefully and correctly. We refer to
the arch over the back connection, where the setting closes up against the hack head of
the boiler. All the other walls of the setting are vertical, or nearly so; but in this
place the bricks must be set in the form of an arch, or its equivalent, and the result is,