Improvements in and relating to Water Tube Boilers.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to Water Tube Boilers.
I, ARTHUR GEORGE MUMFORD, of The Culver Street Iron Works, Colchester,
in the County of Essex, Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
This invention relates to steam generators of the water tube type, and it
consists of further improvements in such boilers having water chambers con-
structed in a manner specified in my prior Patent No. 8498 of 1897.
According to the present invention, the lower row of water tubes on each
side of the furnace are so arranged that they form baffle plates through a portion
of the length of the furnace. My invention also comprises an improved con-
struction of economiser for heating the feed water before it passes into the
boiler by means of the gases passing away through the uptake or flue.
According to the first part of my invention I employ shaped water chambers
as specified in my prior Patent No. 8498 of 1897 having two flattened or
approximately flattened sides adapted to receive the water tubes, the arrangement
being such that the tubes enter the said chambers at right angles in two groups,
the tubes of one group being curved in one direction and the tubes of the
other group being curved in the other direction, by which arrangement an
increased amount of space is obtained between the tubes whereby the passage
of the gases is materially facilitated.
The lower row of tubes on each side of the furnace i.c., the rows nearest to
the fire grate, are so arranged that they lie in contact with one another through
the greater portion of the lengths of the furnace, thus causing the said tubes
to act as baffle plates.
To provide for the secure fixing of these tubes both in the water chambers
and in the steam collector each alternate tube is bent out at its ends so as to
allow its ends to pass through the walls of the water chambers and steam
collector respectively at a different level to the other tubes and where these
alternate tubes bend away from the other tubes and thus break the continuity
of the tubes, a narrow plate is laid over the said tubes so as to preserve the
continuity of the baffle plate formed by the said tubes.
According to the second part of this invention, the improved economiser
consists of one or more chambers adapted to be fixed to the uptakes or flues
in any convenient position, the said chambers being each provided with an
inlet, an outlet, and a drain pipe. In the side of the chamber are fixed a
series of tubes bent into a U-shape, which said tubes are arranged in groups
preferably lying at an angle with the box, the arrangement being such that
the U-shaped tubes project into the uptake or flue so that they become heated.

page_text: by the gases passing away from the furnace and thus heat the feed water
circulating through the said tubes.
Dated this 10th day of May 1899.
ROBERT E. PHILLIPS, Assoc. M. Inst.C.E., M.I.Mech.E.,
Chartered Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.
improvements in and relating to Water Tube Boilers.
I, ARTHUR GEORGE MUMFORD, of The Culver Street Iron Works, Colchester,
in the County of Essex, Engineer, do hereby declare the nature of this inven
tion 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 steam generators of the water tube type, and it
consists of further improvements in such boilers having water chambers con-
structed in a manner specified in my prior Patent No. 8498 of 1897.
According to the present invention the lower row of water tubes on each
side of the furnace are arranged to lie in contact with one another through a
portion of the length of the furnace whereby they form a wall or baffle whereby
the flames and hot gases are caused to travel nearly the whole length of the
furnace before they return through the groups of tubes to the uptake.
My invention also comprises an improved construction of economiser for
heating the feed water before it passes into the boiler by means of the gases
passing away through the uptake or flue.
In the accompanying drawing which illustrates this invention:-
Figure 1 is a view in front elevation one half being in section and
Figure 2 is a view in sectional side elevation on the vertical centre line of
Figure 1.
In both views similar parts are marked with like letters of reference.
The boiler consists essentially of longitudinally arranged water chambers A,
a longitudinally arranged steam chamber B groups of connecting water tubes D),
return connecting water tubes C, a furnace E, and one or more uptakes F. The water
chambers A are of the type specified in my prior Patent No. 8498 of 1897 having
two flattened or approximately flattened sides adapted to receive the water tubes D),
the arrangement being such that the water tubes enter the said chambers at right
angles in two groups, the tubes of one group being curved in one direction and
the tubes of the other group being curved in the other direction, by which
arrangement an increased amount of space is obtained between the tubes whereby
the passage of the gases is materially facilitated.
The water tubes of the lower rows on each side of the furnace i.c., those
nearest to the fire grate, are arranged to lie in contact with one another through
the greater portion of the length of the furnace so as to form a wall or baffle
and to this end the ends of each alternate tube are set off so that they enter
the water chambers A and steam collector B respectively at a different level
to the other tubes as shown in Figure and to preserve the continuity of the
wall or baffle formed by these tubes at their lower ends a plate such as G is
laid over them as shown.
The improved economiser consists of a chamber H formed on or attached to
the base or any other convenient part of the uptake F. In the inner side of
this chamber are fixed a series of return tubes J which are arranged in groups

page_text: preferably lying at an angle with the box as shown in Figure 2, the arrangement
being such that these return tubes project into the uptake where they become
heated by the gases passing away from the furnace and thus heat the feed
water which circulates through the chamber the said chamber being provided
with a suitable inlet h and at its top and with a suitable outlet drain at
its bottom.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
1 claim is:-
(1) In a steam generator of the water tube type consisting of two longitu-
dinally arranged water tubes constructed in the manner specified in my prior
Patent No. 8498 of 1897, a longitudinally arranged steam chamber, groups of
tubes connecting the water chambers with the steam chamber and one or more
return water tubes, arranging the whole or a part of the lower rows of each
group of water tubes so that they lie in contact with one another and form a
wall, as and for the purpose specified.
(2) In a steam generator of the water tube type consisting of two longitu-
dinally arranged water tubes, a longitudinally arranged steam chamber, groups
of tubes connecting the water chambers with the steam chamber and one or
more return water tubes, arranging the whole or a part of the lower rows of
each group of water tubes so that they lie in contact with one another, as and
for the purpose specified.
(3) In combination with a steam generator of the water tube type consisting
of two longitudinally arranged water tubes constructed as specified in my prior
Patent No. 8498 of 1897, a longitudinally arranged steam chamber groups of
tubes connecting the water chambers with the steam chamber and one or more
return water tubes, a device for heating the feed water consisting essentially
of a chamber attached to the uptake or flue and provided with an inlet and
outlet at the top and of a series of return tubes opening into the said chamber
and projecting into the uptake or flue, as set forth.
(4) In combination with a steam generator of the water tube type consisting
of two longitudinally arranged water tubes a longitudinally arranged steam
chamber groups of tubes connecting the water chambers with the steam
chamber and one or more return water tubes, a device for heating the feed
water consisting essentially of a chamber attached to the uptake or flue and
provided with an inlet and outlet at the top and of a series of return tubes
opening into the said chamber and projecting into the uptake or flue, as set
forth.
(5) In combination with a steam generator of the water tube type consisting
of two longitudinally arranged water tubes constructed as specified in my prior
Patent No. 8498 of 1897, a longitudinally arranged steam chamber groups of
tubes connecting the water chambers with the steam chamber and the whole
or a part of the lower rows of each group of tubes being arranged to form a
wall or baffle and one or more return water tubes, a device for heating the feed
water consisting essentially of a chamber attached to the uptake or flue and
provided with an inlet and outlet at the top and of a series of return tubes
opening into the said chamber and projecting into the uptake or flue, as set
forth.
(6) In combination with a steam generator of the water tube type consisting
of two longitudinally arranged water tubes a longitudinally arranged steam
chamber groups of tubes connecting the water chambers with the steam
chamber the whole or a part of the lower row of each group of tubes being
arranged to form a wall or baffle and one or more return water tubes, a device
for heating the feed water consisting essentially of a chamber attached to the
uptake or flue and provided with an inlet and outlet at the top and of a series

page_text: of return tubes attached to the said chamber and projecting into the uptake
or flue, as set forth.
(7) The improvements in and relating to steam generators substantially as
herein before described and illustrated by the accompanying drawing.
Dated this 10th day of February 1900.
ROBERT E. PHILLIPS, Assoc.M. Inst.C.E., M.I.Mech.E.,
Chartered Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.