Improvements in Heating Coils.
Year: 1889

page_text: COMPLETE SPECIFICATION.
Improvements in Heating Coils.
We LEVI HUSSEY (Machinist) and THEODOSIA HATCH (Manufacturer) both of
15, Cortlandt Street, New York City, United States of America, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement :-
This Invention relates to an improved heating coil which is to be used for super-
heating live steam or re-heating exhaust-steam for heating and other purposes, said
heating coil being so arranged that it takes up a comparatively small space in a
horizontal direction but can be extended vertically so as to be adapted to the smoke
flues of a steam boiler and other furnace flues for the, purpose of utilising the waste
heat passing through the flue after it has left the furnace on the way to the
chimney.
The Invention consists of a heating coil made of a number of vertical sections each
section being composed of a number of groups or sets of four or eight parallel pipes
which are connected at one end by return ends and by elbows and short pipes having
right and left hand screw-threads, and at the opposite end with the next group or
set of pipes vertically above it, the upper and lowermost set of pipes of the coil
being connected by Y-pieces and coupling pipes with flow and return main
pipes by which exhaust steam or live steam passes to, and from, the coil. The
connection of the coupling pipes with the mains is made by jamb-nuts having
concave faces and by a packing interposed between said faces and the bosses on
the mains.
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In the accompanying drawings, figure 1 represents a side elevation of the improved
heating coil, shewing the same arranged at both sides of the mains, and figure 2
is a detail vertical longitudinal section, shewing the connection of the main with the
upper and lowermost set of pipes of each section of the heating coil. Similar letters
of reference indicate corresponding parts.
Referring to the drawings, A represents the main by which the live steam or
exbaust steam is conducted to the heating coils B B and A¹ the main by which. the
steam is conducted off from the same to the place of use. The heating coils B B are
composed of vertical coil sections which are arranged side ways of each other
according to the space available in the flue through which the products of combustion
are conducted from the steam-boiler or other furnace to the chimney. Each heating
coil B is constructed in such a manner that it takes up as little space horizontally as
possible while it is extended vertically to any desired extent. For this purpose each
section of the heating coil is constructed of groups or sets of four or eight parallel
pipes a a' which are connected alternately at the ends by return bends a³, and by
elbows a³, and coupling pipes at provided with exterior right and left hand screw
threads screwing into the elbows a³ or a¹, as shewn clearly in figure 1. In the
drawings the pipes a a are arranged above each other in a vertical plane and
are connected by straps 66 which cross the pipes a a¹ at right angles, the straps
at opposite sides of the coil being connected by fastening bolts that pass between
the pipes. The connection of the lowermost and uppermost ends of the double coil
with the mains A A' is made by Y-pieces C and coupling pipes D which latter are
equal in area to the two pipes a a¹. The coupling pipes D are provided at both ends
with right hand screw-threads so as to screw into the Y-pieces and into bosses g on
the mains A A', that end of the coupling pipe which screws into the main being

page_text: provided with a longer screw-thread than the opposite end which screws into the
Y-piece C for the purpose of facilitating the connection between the main and the
Y-piece which is accomplished by first screwing the coupling pipe D into the boss of
the main, as shewn in dotted lines in figure 2, and then screwing it partly back
again and screwing the opposite end at the same time into the Y-piece C which
can be accomplished without difficulty even when the operation has to be performed in
a very contracted space.
On the long screw-threaded end of the coupling pipe D nearest the main is a jamb-
nut E which is screwed home against the boss g on the main when the coupling pipe
is in its proper position in the main and Y-piece C, said jamb-nut having a concave
face between which and the face of the boss is interposed an asbestos or other
packing e which is tightly compressed by the screwing home of the jamb nut against
the boss so as to produce a reliable steam-tight connection between the coupling
pipes D and the main A or A¹.
The advantage of this improved heating coil is that a number of sections may be
arranged closely together and carried up to any suitable height by using a corre-
sponding number of pipes a a¹, return bends a², and connecting pipes a*. If desired,
four pipes may be grouped parallel to each other and connected to the Y-piece C
which four pipes however, have to be equal in area to the area of the coupling
pipe D. By this arrangement the horizontal space occupied by the coil is still more
contracted while it may be extended in the vertical plane to any desired degree.
Another advantage of this construction is that the connection between the mains and
the sections of the coil can be readily established by the coupling pipes and
jamb-nuts, or disconnected whenever pipes have to be replaced or other repairs to be
made. If a single pipe of the coil is to be repaired, this can be readily taken out by
unscrewing the right and left hand connecting pipe a* and unscrewing the pipe from
the Y-piece at its other end, a new pipe being then re-inserted and the right and
left hand connecting pipe a replaced. Another advantage of this improved heating
coil is that a larger area of heating surface is furnished by which the steam passed
through the coils is subjected more effectively to the heat of the products of combus-
tion passing through the flue in which the coil is located so that the reheating of the
exhaust steam or the superheating of the live steam is accomplished in a very
economical and effective manner without increasing the boiler surface.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. The combination, with inlet and outlet mains, of vertical coil-sections arranged
sideways of each other, Y-pieces at the upper and lower ends of said coil sections,
and coupling pipes connecting the Y-pieces and mains, snbstantially as set forth.
2. The combination, with inlet and outlet mains having bosses, of vertical coil-
sections arranged sideways of each other, Y-pieces at the upper ends of said coil-
sections, coupling pipes having threaded ends for connecting the Y-pieces and mains,
and jamb-nuts on the coupling pipes adjoining the bosses on the mains, substantially
as set forth.
3. The combination, with inlet and outlet mains having bosses, of vertical coil-
sections arranged sideways of each other, Y-pieces at the lower and upper ends of the
coil-sections, coupling pipes having threaded ends for connecting the Y-pieces and
mains, jamb-nuts turning on the threaded ends of the coupling pipes and provided with
concave faces, and packings interposed between the faces of the jamb-nuts and bosses
on the mains, substantially as set forth.
4. A coil section for superheating live steam or reheating exhaust-steam, composed
of groups of parallel pipes arranged vertically above each other, Y-pieces at
the
upper and lower ends of each coil section, return bends connecting the ends of

page_text: two adjoining pipes of each group, elbows at the opposite ends of said pipes, and pipes
having right and left hand screw-threads for connecting said elbows, substantially as
set forth.
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1
01
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1000
L. HUSSEY.
T. HATCH.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.
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