Improvements in Wire Covered Steam Pipes.
Year: 1894

page_text: Date of Application, 30th Aug.. 1894
Complete Specification Left, 27th May, 1:95-Accepted, 29th June, 1895
PROVISIONAL SPECIFICATION.
Improvements in Wire Covered Steam Pipes.
1, 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 the covering of copper and other pipes, subjected to
internal pressure, with wire of special sections under tension for the purpose
of protecting the pipes and strengthening them both circumferentially and
longitudinally. The wire is of such section that the several coils of wire are
interlocked the one by the other so that in the event of fracture of one coil the
adjacent coils will not unwind.
The section of the wire may be such that each coil overlaps part of the preceding
one and is partly overlapped by the succeeding one the sections of the wire being
such that each coil fits into the preceding and succeeding ones in such a way that
the several coils are locked in the direction of the axis of the pipe. The sections
however may be plain, although with this form the longitudinal strength is obtained
by friction only and I therefore prefer the sectional locking.
The wire may be of any suitable material and may be wound upon the pipe in
any way which will give the required regularity and tension in winding.
Dated this 29th day of August 1894.
D. B. MORISON.
1, 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 the covering of pipes subjected to internal pressure,
such as copper steam pipes, with wire of special sections, under tension, for the
purpose of protecting the pipes and strengthening them both circumferentially and
longitudinally.
The wire is of such section that the several coils of wire are interlocked the
one by the other so that in the event of fracture of one coil the adjacent coils will
not unwind. The section of the wire may be such that each coil overlaps part of
the preceding one and is partly overlapped by the succeeding one, the sections of
the wire being such that each coil fits into the preceding and succeeding ones
in such a way that the several coils are locked in the direction of the axis of the
pipe. The section however may be plain, although with this form the longitudinal
strength is obtained by friction only and I therefore prefer the sectional locking.
The wire may be of any suitable material and may be wound upon the pipe in
any way which will give the required regularity and tension in winding.

page_text: In the accompanying sheets of explanatory drawings
Figs. I. II, III, show various forms of section of wire such as may be used for
covering pipes according to my invention, whilst
Figs. IV, V, show in elevation (partly in section) and plan a pipe with the coils
of wire arranged in position.
The letters in each of the figures correspond.
Referring to Fig. I :-a, a, a, a, a, etc. show several coils, to an exaggerated
scale, wound under tension round the pipe B. The coil a' overlaps part of the
preceding coil a at c and is partly overlapped by the succeeding coil a³ at c¹.
Hence in the event of one of the coils being fractured the remaining coils cannot
unwind, each being interlocked by its preceding one, and additional longitudinal
strength is given by the friction of the surfaces.
Fig. II. is a modification of the foregoing in which the coils are not of uniform
thickness the bearing parts c, c', 2 etc. being arranged in the form of a V, so that
in the event of fracture of a coil in addition to the remaining coils not being able
to unwind, the coils themselves are also locked in the direction of the axis of the
pipe and so give additional longitudinal strength to the structure.
Fig. III. shows another modification in which the bearing parts c, c', c, etc. are
curved.
I do not confine myself to any particular section of wire the object in all cases
being the interlocking of the coils in order to give longitudinal strength and
prevent the tendency to unwind when fractured.
The wire may be of any suitable material, as for example brass or steel, and
the coils or strands may be soldered or fused either to each other or to the pipe or
to both, either locally at the ends, or throughout as may be desired.
The wire may be wound round the pipe in any way to give the desired tension
and may be laid on in either single or multiple strands.
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
1. Strengthening and protecting pipes, such as copper steam pipes, by means of
wire wound round the pipe under tension, the wire being of such sectious that
each coil overlaps or interlocks the preceding coil and is overlapped or interlocked
by the succeeding coil in such a manner as to give longitudinal strength to the
structure and in the event of fracture of a coil the remaining coils will not
unwind.
2. The combination of sectional wire with pressure pipes the strands being
interlocked and fastened to each other or to the pipe or to both substantially as
described.
3. The strengthening of pipes by lapping them with sectional wire substantially
as described and illustrated in Figs. I to V inclusive.
Dated this 25th dow of Mor 1905
D. B. MORISON.