Improvements in Water Tube Steam Boilers.
Year: 1893

page_text: Date of Application, 16th Jan., 1893
Complete Specification Left, 11th May, 1893-Accepted, 24th June, 1893
PROVISIONAL SPECIFICATION.
Improvements in Water Tube Steam Boilers.
We, JOHNSON MILLS, of Victoria Buildings, Manchester, Engineer, and JAMES
EDWARD MILLS, of Market Place, Heywood, Surveyor, both in the County of
Lancaster, do hereby declare the nature of this invention to be as follows:-
This invention relates 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.
In this invention we construct a water tube steam boiler with either an open
brick lined furnace, or a cylindrical water cased furnace, one or more upper steam
and water drums, and inclined water tubes, terminating at either end in short
cylinders, in lieu of the ordinary form of slabs or headers. We construct these
cylinders of a diameter sufficient to expand in the rear ends of said cylinders the
ends of several rows of inclined tubes placed in zigzag or other form.
We construct the front ends of aforesaid cylinders with a cover that may be
bolted to the angular flange forming the outer front rim of cylinders.
In order to examine or clean the tubes, said cover is removed, when the ends of
onc complete set or nest of tubes are exposed to view, and are easily accessible:
By these means the caps and covers that are ordinarily used and placed over the
end of each tube are dispensed with.
We form a connection between the aforesaid cylinders, and the upper steam
and water drum both at the front and rear ends of boiler by means of flanged pipes
of large internal diameter.
If preferred, stays may be placed extending from each cylinder.
THOMAS PRESCOTT,
53, Arcade Chambers, St. Mary's Gate, Manchester,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Water Tube Steam Boilers.
We,
JOHNSON MILLS, of Victoria Buildings, Manchester, Engineer, and JAMES
EDWARD MILLS, of Market Place, Heywood, Surveyor, 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 :-
This invention relates 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 object of this invention is to simplify the construction of this class of boilers
by obviating the necessity of requiring a large number of hand hole covers such as
are at present employed and placed opposite the ends of the inclined water tubes
which ordinarily terminate in slabs or headers.
*
In the accompanying drawings our invention is shown applied
Fig. 1 representing a side view of a water tube steam boiler with an open or
brick lined furnace. Fig. 2 is a side view of a similar boiler with a water cased
furnace; Fig. 3, is an end view of the cylinder e. Fig. 4, is an end view of the

page_text: same cylinder with the cover g removed. The rear cylinder e¹ is the same as the
cylinder herein last described.
In this invention we construct a water tube steam boiler with either an open
brick lined furnace such as a Fig. 1, or a cylindrical water cased furnace such as b
shown in Fig. 2, one or more upper steam and water drums c, and water tubes such
as d, terminating in short cylinders such as e and e', or cylinders of an equivalent
construction at the front and rear ends of said tubes, in lieu of the ordinary form of
slabs or headers.
We construct these cylinders of a diameter sufficient to expand in the rear
ends and f of said cylinders, the ends of several rows of tubes such as d, as
represented in Fig. 4, which may be placed in zigzag or other form and either more
or less inclined, or placed horizontally.
We construct the front ends of each of the aforesaid cylinders with a cover such
as g and g' that may be bolted to the angular flanges h and h¹ forming the outer
front rim of cylinders, said covers may be constructed with a hand hole cover such
as j, or of other preferred form. In a modification of our invention we make the
outer ends of the hereinbefore described cylinders e and e¹ of a reduced diameter
and employ any preferred form of man hole cover that may be secured thereto by
clamps.
When open furnaces are employed, we fit a pipe m into the block k, with the
upper end of said pipe terminating above the water level in the upper steam and
water drum c.
When water cased furnaces such as bare employed, we pass the pipe m through
the cylinder e in the manner shown in Fig. 2, said pipe being fitted into the
block P and passing through the block k which is of larger internal diameter than
the external diameter of the pipe m, thereby leaving a space between the interior
surface of the block k and the exterior surface of the pipe m. The upper end of
the pipe is extended above the water level in the drum c; by these means the
water is caused to circulate directly from the water casing 61 that encircles the
furnace, to the upper steam and water drum c, the circulation from the tubes d is
not interrupted, and the steam and water that rises from the water casing
prevented from mixing with the water issuing into the cylinder e from the inclined
tubes d, which is of lower temperature. A connection is formed between the rear
cylinder e and the steam and water drum c by means of the pipe r.
is
In order to examine or clean the tubes, one or both of the covers g
and g' are
removed, when the ends of the whole range of tubes d are exposed to view.
If it is necessary to remove the pipe m shown in Fig. 2 in order to clean the
centre rows of tubes, said pipe may be disconnected at the flanges m' and m² when
the intermediate portion of the pipe can be readily withdrawn, and if necessary the
end portions also. The rear cylinder e¹ may be attached to a block such as q
which may rest on rollers t: the ends of the tubes » connecting said block and the
rear end of water casing & may be expanded. If preferred stays may be placed
between and extending from each cylinder.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-*
In water tube steam boilers, or boilers that are formed by a combination of one
or more steam and water drums with water tubes more or less inclined or placed
horizontally,
1st. The use of a cylinder or cylinders such as e and e' in lieu of either slabs or
headers, in which to expand the ends of water tubes such as d, said cylinders being
provided with a cover at their front or outer ends, that may be either bolted to
the angular flanges on the edges thereof, or employed in the form of man hole
covers and secured thereto by clamps, in the manner and for the purpose sub-
stantially as herein before described.
2nd. Connecting the outer case of the water cased furnace by means of cast steel

page_text: bosses or wrought iron blocks to the cylinder into which the upper ends of the
inclined nest of tubes are fixed, in the manner and for the purpose substantially as
herein before described.
3rd. The means employed for conveying the water and steam from the water
cased furnace directly through the tube cylinders into the upper steam and water
drums, in the manner and for the purpose substantially as herein before described.
Dated this 10th day of May 1893
THOMAS PRESCOTT,
53, Arcade Chambers, St. Mary's Gate, Manchester,
Agent for the Applicants.