Improvements in or relating to Water Tube Steam Boilers.
Year: 1893

page_text: Date of Application, 22nd Sept., 1893-Accepted, 11th Nov., 1893
COMPLETE SPECIFICATION.
Improvements in or relating to Water Tube Steam Boilers.
We, JONATHAN GRESTY of The Park, Eccles, Engineer, and GEORGE HENRY
HERBERT, of Abbey Hills Road, Oldham, Engineer, both in the County of
Lancaster, do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:--
The improvements which are the subject of this invention, relate to water tube
steam boilers such as are formed by one or more steam and water drums in
connection with one set, or several sets or nests of inclined water tubes.
The objects of this invention are to obtain increased efficiency in less boiler
space, to prevent priming, to cause the steam to more freely separate from the
water, and to intercept and collect the dirt and sediment from the water in its
course of circulation between the steam and water drum, and the group of inclined
water tubes.
We attain these objects by the means hereinafter described and as illustrated in
the accompanying two sheets of drawings, in which
Fig. 1 is a sectional elevation of an ordinary form of water tube steam boiler
with our invention applied.
Fig. 2 is an enlarged view in section of part of upper steam and water drum,
with internal cylindrical box or steam separator attached constructed according to
this invention.
Figs. 3 and 4 are sectional end and side views of the same drum with a division
plate formed with perforations in the upper half.
Figs. 5, 6, 7 and 8 are alternative arrangements for placing the mud drum or
drums, so as to effect the object of intercepting and collecting the dirt and sediment
from the water as herein before named.
Fig. 9, is a section of a wrought iron or steel header.
In these views similar letters refer to similar parts.
In this invention in order to obtain dry steam, we place around the inner side of
and near the front end of steam and water drum b, a cylindrical box m; we
perforate the inuer surface of the upper portion of said box, by which means the
water which enters through the uptakes is caused to pass round to the upper
portion of said box before entering the steam and water drum, or in lien of the
said cylindrical box we place a diaphragm plate m' as in Figs. 3 and 4 with the
upper portion of the plate perforated, and battles m² placed against the perforated
portion.
We construct the front and rear headers preferably in one or two parts.
When said headers are in two parts we form the division by means of a zigzag
plate, or we construct said headers as in Fig. 9, of wrought iron or steel plates
dished out, one flange plate in which the hand holes are placed, fitting in the other
flange plate which forms the tube plate, and rivetted so that the seam of rivets has
the heads externally.
The front and back plates are connected and stiffened by studs, stays, or tube
stays expanded in the plates, or other suitable means.
In order to separate the dirt and sediment from the water in its passage between
the steam and water drum and the rear header with the rear ends of the inclined
water tubes connected thereto, we construct a mud drum as g, which we connect
near to either the lower or the upper end of the rear header h', and opposite the
hand holes in either the bottom or top part of said header as in Figs. 5 and 6, by
means of nipples f, one end of said nipples being expanded into the hand holes in
the header h, and the opposite ends into holes formed in the mud drum g.

page_text: The hand holes in the mud drum are in a line and corresponding in number
with the tubes e contained in the row opposite which said mud drum is placed,
and connected to the header by the nipples f. By these means, direct access is
obtained through said nipples to such of the tubes e, opposite which the nipples f
are affixed: As an alternative arrangement, we place the mud drum between the
underside of steam and water drum, and the upper end of the rear header from
which a row of nipples are extended into and part way through the mud drum g
as in Fig. 7, or a double mud drum may be connected by nipples f^ or by flange
pipes with the lower end of the header in the manner shown in Fig. 8.
By these means the dirt is intercepted and collected from the water in its
passage from the steam and water drum to the rear header and the inclined tubes.
The mud drum g may be more effectually connected with the beader h¹ by means
of a stay bolt passing through the nipple for placed on the outside and bolted to
lugs formed on said mud drum.
Having now particularly described and ascertained the nature of this our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
1st. In water tube steam boilers such as are formed by one or more steam and
water drums in connection with one set or several sets of inclined water tubes, the
combination with the upper steam and water drum of an internal cylindrical box
with the upper portion perforated, in the manner and for the purpose substantially
as herein before described.
2nd. In water tube steam boilers such as are formed by one or more steam and
water drums in connection with one set or several sets of inclined water tubes,
the combination with the upper steam and water drum of a diaphragm plate with
the upper part perforated, and baffles placed against the perforated portion, in the
manner and for the purpose substantially as herein before described.
3rd. In water tube steam boilers such as are formed by one or more steam and
water drums in connection with one set or several sets of inclined water tubes,
the combination of a mud drum with the rear header connected by means of
nipples which may project into said mud drum, for the purpose and in the
manner substantially as herein before described and as shown in Figs. 5, 6, 7
and 8 on drawings.
Deted this 21st day of September 1803
THOMAS PRESCOTT,
53, Arcade Chambers, St. Mary's Gate, Manchester,
Agent for the Applicants.