The Topeka state journal. [volume] (Topeka, Kansas) 1892-1980, 1909-11-30

thin as safety will permit in order that
all parts will serve as heating surfaces.
Each drum contains as many fire-tubes
as consistent with the volume of steam
space required. In the rear drum the
tube ends are welded to the tube
sheets. while in the forward drum the
tube ends are rolled and beaded. The
drums are supported by brackets bolted
to the smoke arch and are readily re-
movable.
Exhaust Is Enclosed.
Between the exhaust pipe and the
stack, the exhaust is thoroughly en-
closed in order that there may be no
draft to induce gases direct from the
boiler hues to the stack. The enclosed
petticoat pipe is connected by an elbow
with a large opening through the for
ward drum The draft, therefore, is
forward through the tubes of both
drums and rearward through the large
!! opening of the forward drum.
Flue gases pass straight through the
tubes of the rear drum from the boiler
tubes. Upon leaving the rear drum,
the gases are detected around the
petticoat pipe and elbow and pass for
ward through the tubes of the forward
drum to the front end of the smoke
arch. Here they are reversed and
drawn backward through the cylin
drical opening in the forward drum and
are swept upward through the petit
coat pipe to the stack.
To aid in the direction of the greater
portion of the gases through the f1ues
of the superheater drums DETECTING
plate is so located as to obstruct the
rapid flow of gases around the drums.
The shape of this plate conforms to
the area between the forward drum and
the smoke arch and the plate is located
about one inch ahead of the forward
drum. wide opening at the bottom
of the plate allows a rapid flow of gases
through this section to sweep out any
ri M hof iCI1f fol fn q hn+fnI~l
of the smoke arch. The shells of the
drums are thus allowed to come in
contact with hot gases, but the gases
around these surfaces have little or no
velocity
The passage of gases through the
tubes of the superheater drums so
breaks up the cinders carried by the
gases that the usual form of front end
netting is unnecessary The arrange
ment incident to the application of this
type of superheater is a radical de-
parture in the drafting of American
locomotives, as it does away with the
diaphra GIN and netting, the draft being
very direct and also pulling on the fire
much more evenly. thus obtaining more
complete combustion and more eff
fiicient evaporation.
Simple and Compound Engines.
Steam is conducted from the dry pipe
to the forward drum, where it is cir
culated around the tubes. When the
superheater is applied to a simple en-
CINE. the steam is conducted from the
forward to the rear drum where it is
again circulated around the hot tubes.
and it is then carried to the steam
chests. Battle plates of thin sheet iron
direct the circulation of steam in both
drums.
When applied to a compound engine.
steam is conducted from the forward
drum to the high pressure cylinders.
Exhaust from the high pressure cylin
ders is directed to the rear drum where
the steam is again superheated before
being passed on to the low pressure
cylinders. The accompanying line en-
craving illustrates the superheater and
its connections applied to the balanced
compound locomotives of the Atlantic
tyne described in the previous article.
The first Jacobs superheater placed ii
service has been in continuous OPERA
ton for IS months with absolutely no
repairs TO the superheater One hun
dred and forty-six superheaters of this
| type are now i'm operation and under
| construction. The average superheat
| obtained is 30 degrees and a saving of
| II per cent in fuel and 25 per cent in
water has been effected.