Improvements in Flue Covers as Applied to Steam Boilers.
Year: 1892

page_text: Date of Application, 6th Apr., 1892
Complete Specification Left, 9th Dec., 1892-Accepted, 21st Jan., 1893
PROVISIONAL SPECIFICATION.
Improvements in Flue Covers as Applied to Steam Boilers.
GEORGE CROSLAND TAYLOR Ravenscar Helsby near Warrington Electrical
Engineer. I do hereby declare the nature of this invention to be as follows:
Instead of covering the smoke flues connected with or around a steam boiler with
arched brickwork, or brick flue covers, as is well understood, I cover the flues in
with certain loose metal plates, or fireproof slabs, either flat, corrugated, or curved
in shape; supported on the brickwork of the flues, these plates, or slabs are in
suitable small sizes to allow for expansion, and easy removal, and if one side of the
plates, or slabs, is next the boiler, these slabs, or plates, are supported on a suitable
iron framework, in lieu of brickwork. The plates, or slabs when in position are
covered a few inches deep with non-inflammable, and anti-heat conducting substances
such as slag-wool, sand, to fill up the crevices. The plates or slabs are thus easily
removed, even with the fires in if necessary, for the purpose of inspecting, the
boiler, & flues, & for cleaning purposes, whereas the usual brick arched flues are
not usually accessible, except by small cast iron manholes here & there, when the
fires are out.
Dated this Fifth day of April 1892.
COMPLETE SPECIFICATION.
Improvements in Flue Covers as Applied to Steam Boilers.
GEORGE CROSLAND TAYLOR, Ravenscar, Helsby, near Warrington, Electrical
Engineer. I 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 :---
Instead of covering the smoke flues connected with, or round about steam boilers,
with arched brickwork or brick flue covers as is well understood, the brick flue
covers as usually constructed, are dispensed with altogether, and instead, the flues are
covered over with loose, or tixed metal, or fireproof slabs, which may be either flat,
corrugated, or slightly curved in shape, supported on the brickwork of the flues,
these plates, or slabs are in suitable small sizes to allow for expansion, and easy
removal & fixing, and if one side of the flue is next the boiler shell or flue, these
plates, or slabs are supported on that side next the boiler, on a suitable metal
framework in lieu of brickwork. The brickwork of the sides of the flues are also
built up straight, nearly to the top of the brickwork around the boiler, so as to
leave a small ledge wide enough as may be required, to carry the ends of the plates,
or slabs, which are to cover in the flues. The plates, or slabs, when in position,
are covered a few inches deep with a non-inflammable, or anti heat conducting
substances, such as slag-wool, sand, or similar substances, or compositions, or
cements, containing such substances, for the purpose of filling up the crevices if
any, and keeping outside of the flues cool. When the slag-wool, sand, or com-
position, is removed the plates, or slabs, can be easily removed and replaced even
with the fires in if necessary, for the purposes of inspecting the boiler and flues, &
for cleaning purposes, whereas the usual brick covered flues are not usually
accessible, except by small cast iron manholes here and there, and when the fires
are out, or removing brickwork over flues.

page_text: The Figs. 1. 2. 3. 9. 10. 11. 12. are drawn to an approximate scale of inch to
one foot.
The, Figs. 4. 5. 6. 7. 8. are drawn to an approximate scale of 1. inch to
one foot.
The drawings represent an ordinary Lancashire style of boiler. with two
furnaces, 22 feet long, 7 feet diametre, with flues round about it of usual size and
design, as the flues would be if fitted with flue covers to this specification, except
Fig. 1. The flue covers can be constructed for, and applied in a similar manner to
any other type of boiler or flues, this system of flue covers not being intended
simply to be applied solely to this particular style of boiler, and flues.
Fig. 1 shews section of a boiler A, side flues B. B, bottom flue C,-firebrick
lining F. F, the two flues B B, and the back end of flue C being covered in with
the usual curved firebrick flue covers E. E, & brickwork as is well understood is
the usual method of covering in boiler flues as followed for many years past.
Fig. 2. shews section of a boiler A, with the top coverings at E. E, of side
flues B. B, and the top covering of back end of bottom flue C at back end of boiler,
removed, and the flue sides carried up straight, and left open, leaving the flues
round boiler entirely open to view. The firebrick lining F. F. being carried up as
high as required to leave a ledge, for the flue covers to rest upon, but not above
the brickwork E. E. of the outer sides of the flues.
"
Fig. 3 shews the horizontal arrangement of boiler A., with flues as seen in Fig. 2.
more fully all over, with back end of flue C. at D. D. with mid feather wall not
shewn in Fig. 2. flue doors I. I. leading into flue main G., side flues B. B., inner
firebrick lining F. F. F., and other brickwork EEE. The level of top of brick-
work F. F. F. is below level of brickwork E. E. E, in order to leave a ledge, to
carry flue covers, and space to fill in level with brickwork EE E, with compositions,
or cements, over flue covers, on side flues BB, back flues D D, & main flue, or
flues G., leading to chimney outlet.
Fig. 4. shews section of boiler shell A. A. with saddle irons N. N. laid over the
shell for the purpose of supporting the longitudinal bars M. M., which are held
fast in the seatings formed at ends of saddle irons N. N. by the wedges S. S. The
bars M. M. may be of any suitable section the 1 section shewn is convenient in
practice. These longitudinal bars M. M. extend from the front to the back of the
boiler. A. A., and are for the purpose of supporting the various styles of flue
covers K. L., of the various or similar styles of flue covers shewn in Figs. 5. 6. 7.;
the other end of the flue covers K. L. resting upon the brickwork F. and covered
in level with the fireproof.composition, or cement H. up to the level of the other
brickwork E., or as thick as may be desired.
:
B is the side flue covered in with flue covers K. L., and composition, or
cement H, supported on firebrick F., and the longitudinal bars M. M. on each
side of boiler A. A., which bars M. M. are carried by saddle irons N. N.
The saddle irons N N are not attached to the boiler shell, though they could
be, only laid upon it, the bars M M might also be riveted or bolted to
the boiler, but for well known reasons it is preferable not to attach anything
to a boiler shell which can be avoided. At P. there is a compensating screw
bolt & nut which is to draw & attach the saddle irons N. N. together in such
a manner, that the ends of these irons N. N. hold the bars M. M. level with the
top of brickwork F., thereby overcoming the irregularities of level caused by
inner & outer plates of boiler shell, & the setting of the boiler itself. The saddle
irons N. N. may be divided into more than two pieces; & held together by more than
one bolt & nut P. The bending of the saddle iron N. at O. O., shews the method
of setting the saddle iron over or across riveted joints in the boiler shell. The
dotted lines around about D. shew the arrangement of covering of flues at back of
flue C, shewn on Fig. 3 at D. D., this arrangement at D at back, being more fully

page_text: shewn on Fig. 11. The elevation of saddle iron N and bar M. is shewn at N'M';.
hole for compensating bolt and nut at P', wedge S, at S', with flue coverings K¹ L..
Fig. 5. Bar M as in Fig. 4. Metal corrugated flue cover K. made in pieces six
inches wide thereabouts or more, laid overlapped. Should be fairly thick metal."
Composition, or cement H, laid on top of flue cover K..
Fig. 6. Bar M. as in Fig. 4. Flue coverings K. L., are plain flat bars cut to
lengths required, and of various sections of plain flat rectangular bar iron, as shewn
of plain section iron, the two layers of flue cover bars K. L. are to be so laid in
position that the side joints do not coincide, as shewn. The upper layer of bars or
plates K. may if desired be dispensed with altogether, and only the bars or
plates L. used as a flue cover, also each of the bars of the layer of flue covers L. may
be rolled or cast with a lap joint on the edge or side of it, and so lap joint on each
other in a manner similar as is well understood a lap ridge roofing tile is lapped.
H. is the composition or cement applied over the flue covers K. L.
Fig. 7. Bar M. as in Fig. 4. fastened to saddle iron end N, by wedge S.
The shaped bar of metal L. rests on bar M, and on the brick F. shewn in
Fig. 4. across the flue B. Fig. 4. and resting on and between these 1 shaped bars L.,.
are placed metal, or firebrick, or fireproof slabs K, the whole is covered over with
the composition, or cement H.
Fig. 8. shews joint for longitudinal bars M. M. Fig. 4., where required, as in
joint at V. Fig. 9, the joint consists of a shoe of metal T, with bar M inside,.
secured by wedge S.
Figure 9. General view over top of boiler A shews saddle irons N. N. N. N. N.
with compensating bolts & nuts P. P. P. P. P. The longitudinal bars M. M. in
position over flues B. B. Flue doors 1. 1. leading from flues B. B. into main flue
to chimney G.-D. D. are flues at back of boiler A, leading down into flue C.
under the boiler A.-K. L. shews arrangement of flue covers (shewn on one side
of boiler A only, and a part over flue G.) arranged as shewn in Fig. 6, without
composition, or cement, on the flue covers K. L.; placed in position resting on
bar M. and on brickwork F; on the flue G., the covers K. L are laid upon the
brickwork F. F. on both sides, and over flue D. on brickwork both sides.
V shews joint in longitudinal bar M., this joint may not always be required.
X. X. are extra supporting bars of rectangular or angle 1 or H section bar
iron, to support bar M up to flue door I, but are not always necessary.
Figure 10. Sectional elevation of boiler A. and flues B, B, C, through middle,.
with saddle irons N. N. Flue covers K. L., longitudinal bars M. M in place, and
composition, or cement H in position.
Figure 11. Sectional elevation of boiler A. and flues B, B, C, C. and back
flues D, D, shewn at back end of boiler A, covered in with flue covers KL, KL,
KL, KL, at sides and over back flues D D of boiler A, and supported by the
brick walls F, and bar irons M. M., and saddle irons N. N. on boiler A; and
composition, or cement H on the flue covers, to close all in, & to fill up all
crevices.
Figure 12.
Longitudinal sectional elevation of one of the side flues B. B. B.,
on a side of boiler A, shewing saddle irons N. N. N. N. N., compensating bolts &
muts P. P. P. P. P., longitudinal bar M. over side flue B. B. B. supporting flue
covers K. L., and composition, or cement H. Extra supports to bar M. if
required at X. X. Flue door J.-Main flue to chimney G. covered in with flue
covers K. L., and composition, or cement H. Flue under boiler C.-Top of back
flue D.-Brickwork of flues E.-The boiler A in position.
Having now particularly described and ascertained the nature of my said inven.
on, and in what manner the same is to be performed, I declare that what I
claim is:
I. A flue cover or covers, to cover in, or over the flues of steam boilers,
constructed as regards the flue cover, or covers, in a manner similar as described.

page_text: II. A combination of a steam boiler with a framework, or saddle iron as
described, carrying a longitudinal bar to support a flue cover, or covers.
III. A combination of the flue covers as described, and where required the saddle
framework as described with slag wool, or sand, or compositions, or cements,
containing the same, for the purposes described, & specified..
Dated this Seventh day of December 1892.
GEORGE CROSLAND TAYLOR.