The Topeka state journal. [volume] (Topeka, Kansas) 1892-1980, 1910-09-26

ricks at Chicago that the boiler was
ready to go into service.
Beside the construction of the fire
box itself, another secret of the ex-
plosion-proof boiler is that the flues
are welded into the flue sheet rather
than rolled or heated into it by the
autogenous process. The oil-burne r
was necessary feature of the test in
that the supply could be cut off from
shelter. Probably no fireman could
have been found who would have fired
the boiler in the face of so apparent
danger. An idea of the heat under the
boiler can be gotten from the fact that
the temperature in an oil burner is
about $500 degrees.
Description of Fire Box.
A description of the Jacobs-Shupert
fire box which by the result of the
test this morning is destined to revolu-
ttpnize the boiler making industry was
given in the State Journal at its in
vention. Claims for the new boiler
some of which the test this morning
proved include:
This type of firebox is less liable
to violent explosions than the ordinary
type, due to it's sectional construction.
In the Jacobs-Shupert sectional COM
StructiOn, 1t will be impossible for a
break to extend from one section into
the next section. Should a rupture oc-
cur in any section, there will simply
be a local break in that section which
cannot pass beyond the stay sheets TO
which the section is riveted. The pres
, sure can have no leverage to rupture
| the metal in the next section, and con-
sequently no explosion can occur which
! will give the disastrous results as
shown in figure 6.
The arched, pressure withstanding
| concave construction of the sections in
sures that there will be no undue and
| enormous local stresses either due to
pressure or induced by extreme
| changes in temperature.
'Deteriorating strains from unequal
! expansion and contraction that destroy
| the original strength can be avoided by
rendering unequal expansion impossi-
BILE or by providing such elasticity that
| should it occur it can produce no de-
teriorating strain.
1.-The shape of each section is such
| that it will expand or contract with
variations of temperature, and pro-
duce only small stresses on the ada
cent sections. This is not true Of the
| usual firebox. Furthermore, this sec
/ tional construction is specially adapted
! to relieve the excessive stresses that are
| set up in the ordinary construction by
the difference in temperature due to
cold feed-water. When cold water is
| injected into the boiler, the tempera-
| ture of the side sheet is very much
reduced, and the effect is to contract
the side sheet at it's lower portion
I
expansion are practically irresistible
and if no provision is made to take
care of the contraction or expansion
there will be enormous local stresses
| set up in the metal
Due to this design, and also to the
absence of stayboltS and crown-baT
bolts, the maintenance cost of the boil
er is very much lower than with the
present construction. The mainten-
ance cost should be at least 60 pei
cent less than is now the case. AS the
| cost of maintenance and renewals Of
| fireboxes. staybolts. and flues amounts
| to an approximate expenditure OF
| 100000 per year on a railroad op'
Grating 1900 engines, this firebo1
should bring about a reduction of ovel
S1,20O,000 yearly in this expense.
! There should be a reduction in the
amount of fuel used per unit of power
| developed, equal to IL per cent. Thi!
would appear either as a direct reduc'
| ton in the total fuel cost, or as ar
| increased gross ton mileage per tor
! of fuel consumed, and in either case
| the cost of fuel as a proportion Of
| transportation expense. would be re-
| ducad -