In Making the JOILLS of ripes of Steel or Copper or other similar Metal or Alloy.
Year: 1888

page_text: In Making the JOILLS of ripes of Steel or Copper or
other similar Metal or Alloy.
I, ROBERT BAND POPE, of the firm of Denny and Company of Dumbarton, in the
County of Dumbarton, North Britain, 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, that is to say :-
My said Invention relates to pipe joints made on the same principles as thoseo
described in my Patent Specification No. 8950 of 1886 and it comprises improvements
having for object to render the kind of joint more satisfactorily and conveniently.
applicable with some metals, and when the pipes have to withstand very high pressures
of steam or other fluid passing through them.
My improved joints are shown upon an accompanying sheet of explanatory drawings
figures, 1, and 2, thereon being sections showing one modification as applied to a joint
between two pipe lengths and to a joint between a pipe length and a cast flange; and
figures, 3, and 4, showing another modification similarly applied. In these drawings
the same reference letters are used to mark the same or like parts wherever they are
repeated.
In the modification shown in figures, 1 and 2, the pipe lengths, A. of steel or other
suitable metal, have flanges, B, C, formed on their ends, one at least of these flanges
being formed after two joint rings, D, E, have been strung upon each pipe length.
The joint rings, D, E, are formed with narrow projecting annular ribs, R, which when
the rings are drawn together by screw bolts, S, bear on the flanges, B, C, the pressure
with which the rings are drawn and held together being concentrated on the contact
surfaces of the ribs, R. In order that there may be a similar concentration of pressure
upon a narrow contact area between the contiguous flanges, B, C, of the pipe lengths,
one B, of these flanges has its surface turned down or otherwise shaped so as to present
a narrow projecting annular rib, T, to bear upon the flange, C, of the other pipe length.
With this modified or improved construction less strength of rings, D, E, and bolts, S,
is required to render the joint fluid-tight against high pressures than when the flanges
are in contact over comparatively broad annular surfaces.

page_text: When a pipe length, A, has to be fixed to a cast flange, G, figure, 2, the flange may
be made with a flat surface the pipe flange, B, being made with the rib, T, as shown.
In the modification shown in figures, 3, and 4, the bearing surfaces of the rings, D,
are made without the annular ribs, R.
If considered desirable in any case two or more annular ribs, T, may be formed on
a pipe flange, B.
Instead of using complete rings (D, E) which have to be placed on the pipe
lengths before the Hanges B, C, or one of them is formed, the rings may be made in
halves with the meeting ends half-checked to each other; or each ring may consist of two
thicknesses each thickness being in halves and the four parts being arranged so as to
break joint.
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 I
claim is :-
In making pipe joints by binding together flanges on the ends of the pipe lengths
by rings made to compress the flanges by screw bolts, the formation and use of one
or more narrow projecting annular ribs, T, on the joint surface of one of the pipe-
length flanges, substantially as hereinbefore described.
Dated thin Turalfth day of Autobar 1988
EDMUND HUNT,
Applicant's Agent.