Improvements in Furnace Tubes or Flues for Steam Boilers.
Year: 1892

page_text: Date of Application, 8th Dec., 1892
Complete Specification Left, 7th Sept., 1893-Accepted, 7th Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in Furnace Tubes or Flues for Steam Boilers.
I, DONALD BARNS MORISON of Hartlepool Engine Works, Hartlepool, in the
County of Durham, Engineer, do hereby declare the nature of this invention to be
as follows:-
My invention relates to improvements in boiler furnace tubes or flues of the
kind that are constructed of a series of short lengths of tube joined together by
flanged joints of the Adamson type or by other suitable means. My invention has
for its object the forming of the tubes between the flanges or junctions so that
great strength to resist collapse is obtained together with longitudinal elasticity.
For this purpose the material of which each length of tube is made is so disposed
that the elements of support are towards the water space and are thus protected
from the fire, whilst on the water side there are no narrow pockets or cavities for
the undue accumulation of deposit, and on the fire side the horizontal current of
heated gas sweeps over and is in contact with the greater portion of the tube
surface affected by such current, the supporting elements being narrow so as to
thereby minimise the size of the spaces that might serve as receptacles for the
lodgment of gas having a less circulation and less temperature than the main
current of gas.
A furnace tube or flue composed of a series of tubes with flanged ends and
Adamson joints is constructed according to my invention as follows:-
About midway between the flanges there is a supporting corrugation or ridge
projecting towards the water space, the diameter over the apex of the ridge being
usually slightly less than the diameter at the flanged joint. The radius at the
flange is of the dimensions usual in practice, the material between such radius and
The material
the supporting ridge or corrugation being disposed in a long curve.
is preferably of equal thickness throughout, but the thickness may be increased at
the supporting ridge or elsewhere if required.
Dated this Eighth day of December 1892.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Furnace Tubes or Flues for Steam Boilers.
I, DONALD BARNS MORISON, of Hartlepool Engine Works, Hartlepool, in the
County of Durham, Engineer, 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:-
My invention relates to improvements in boiler furnace tubes or flues of the
kind that are constructed of a series of short lengths of tube joined together by
flanged joints of the Adamson type, or by other suitable means. My invention
has for its object the forming of the tubes between the flanges or junctions so that
great strength to resist collapse is obtained together with longitudinal elasticity.
For this purpose the material of which each length of tube is made is so disposed
that the elements of support are towards the water space, and are thus protected
from the fire, and so that on the water side there are no narrow pockets or cavities
for the undue accumulation of deposit, and so that on the fire side the horizontal
current of heated gas can sweep over and be in contact with the greater portion of

page_text: the tube surfaces affected by such current, the supporting elements being narrow
so as to thereby minimise the size of the spaces that might serve as receptacles for
the lodgment of gas having a less circulation and less temperature than the main
current of gas.
In the accompanying illustrative drawings,
Figs. 1 & 2 show respectively in side and end elevation, a furnace tube or flue
composed of a series of tubes with flanged ends and Adamson joints constructed
according to my invention.
Fig. 3 is a longitudinal section, to a larger scale, showing one length of tube
together with parts of the adjacent lengths of tubes to which it is connected.
Each of the short lengths of tube of which the complete furnace tube or flue is
made, is provided at its ends with outwardly extending flanges 1, and at about
midway of its length with an outwardly extending supporting corrugation or
ridge 2, the greatest external diameter of which is preferably slightly less than
the external diameter of the flanges. The radii 3, 3, of the flanges 1, 1, are of the
dimensions usual in practice. The material 4, between each of the radii 3, and
the corrugation or ridge 2 is disposed in the form of a long curve as shown whereby
great strength to resist collapse, and also longitudinal elasticity are obtained,
whilst avoiding the formation of narrow pockets or cavities on the water side liable
to promote undue accumulation of deposit. The lengths of tubes are rivetted
together by their flanges between each adjacent pair of which a ring 5 is secured
as shown. Thus it will be seen that all the flanges joints and corrugations, or
ridges 2 forming elements of support are on the water side and thus protected
from the fire, whilst the inner sides of the curved portions 4 of the length of tube
form effective heating surfaces exposed to the flame and hot gases passing through
the furnace tube or flue. The material of which the short lengths of tubes are
composed is preferably of equal thickness throughout, but the thickness may be
increased at the supporting ridge or elsewhere if required.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
The hereinabove described improved construction of furnace tube or flue each
length being formed with end flanges projecting outward or into the water space
and midway of its length or thereabout with a supporting corrugation or ridge 2
that projects outward or into the water space the material between the radius 3 of
each flange and the said corrugation or ridge 2 being disposed in the form of a
long curve 4 adapted to afford considerable resistance to collapse and also elasticity
in a longitudinal direction as set forth with reference to and illustrated by the
drawings annexed.
Dated this 7th day of September 1803
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.