Improvements in Boiler and other Tubes.
Year: 1892

page_text: Improvements in Boiler and other Tubes.
A communication from abroad by ANATOLE BERE, of Rue de la Neva, Paris, in
the Republic of France, Engineer.
I WILLIAM ASCROFT BYROM of 8 Old Jewry in the City of London Solicitor
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 tubes having internally longitudinal and continuous
wings or ribs for the purpose of increasing their internal conducting surface. In
the tubes of this nature at present known the increased heating surface is obtained
by a large number of ribs, say from 7 to projecting inwards a comparatively
short distance say from to of the diameter, from the inner circumference of the
tube. This is open to the objection of baffling the draft, and a large proportion of
the heating surface being covered through by the lodging of cinder thereon. Two
evils arise from this arrangement viz. the imperfect absorption of the heat of the
rapidly moving gases thro' the centre of the tube and the decrease of efficiency as
the debris shields the short ribs from direct contact with the heated gases.
By my invention these defects are overcome by increasing the projection of the
ribs towards the centre of the tube whilst at the same time I reduce their number.
I use 2. 3 or at most 4 ribs and only limit their projection towards the centre by
practical considerations of facility of cleaning and free expansion of the ribs in the
direction of the diameter of the tube thus avoiding draught baffling and bringing
the ribs into intimate contact with the central body of moving heated gases. From
this it follows that I make the ratio between the length of projection of the ribs
and the tube diameter greater in large than in small tubes. In all cases I
arrange the ribs symetrically within the tube looking at the tubes in cross section.
Where there are only two ribs they project from opposite ends of the same diameter;
where I employ 3 ribs they are placed equally round the internal circumference.
each project along the diameter towards the centre; where I employ 4 ribs they
also are equally spaced round the circumference and each rib is at right angles to
those adjoining.
Though I have described my invention as applied to steam boilers it is obvious
that it is equally applicable for other purposes such as heaters condensers &c.
The accompanying drawings further explain the methods in which I carry out
my invention.
Fig. I shews the cross section of a tube having two internal ribs A. A this
being the arrangement I prefer to use in tubes of small internal diameter.
Fig. I shews the cross section of a tube having three symetrically arranged.
internal ribs B. B. B &
Fig. III shews the cross section of a tube having four symetrically arranged
internal ribs C. C. C. C this being the maximum number I prefer to employ in
large tubes.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what J
claim is:
The employment of tubes having internal ribs of maximum length of projection:
and minimum number for conducting heat from internal gases or fluids substantially
as hereinbefore particularly described.
Deshi yosh
1000