Year: 1888

page_text: Date of Application, 16th May, 1888
Complete Specification Left, 27th July, 1888
Complete Specification Accepted, 10th Aug., 1888
I WILLIAM ALLAN of Scotia Engine Works, Sunderland in the county of Durham,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved construction of pipes, particularly such pipes
as are subjected in use to high pressures and temperatures.
The object of the invention is to combine immunity from corrosion with increased
strength without a corresponding increase in the cost of manufacture, whereby a greater.
measure of safety and durability is obtained.
To this end I line the ordinary iron or steel pipe with a solid drawn tube of non-
corrodible metal, such as copper. The lining must fit tightly so as to obtain the
combined strength of both tubes and for this purpose I insert the liner by shrinking
on the outer tube suitable provision being made for ensuring the practical continuity
of the lining metal at the joints.
J. C. CHAPMAN, Fel. Inst. P.A.,
70, Chancery Lane, W.C.,
Agent for Applicant.

page_text: I WILLIAM ALLAN, of Scotia Engine Works, Sunderland, 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:-
This invention relates to an improved construction of pipes particularly such pipes
as are subjected in use to high pressure and temperature, and also pipes used for the
conveyance of fluids or liquids.
The object of the invention is to obtain immunity from corrosion with increased
strength without a corresponding increase in the cost of manufacture, whereby a greater
measure of strength and durability is obtained.
To this end I line ordinary iron or steel pipes or other tubes of material subject to
corrosion with a solid drawii tube of non-corrodible metal such as copper or brass, the
external diameter of which is equal to or so nearly equal to the internal diameter of
the outer pipe as to enable it to be inserted.
Ι
The lining must fit tightly so as to obtain .the combined strength of both tubes and
also to obviate the possibility of liquid or fluid intervening, and for this purpose
either shrink the outer tube on to the liner or I first insert the liner into the outer
tube and then by means of a draw mandril (such as is ordinarily used in tube making
and is well known to those skilled in the art) I expand or force outwards the liner
with sufficient pressure to cause it to fit closely and firmly all around and against its
enclosing tube.
I make provision for ensuring the practical continuity of the lining metal at the
joints either by laying over or Hanging the liner at the ends, so that the said non-
corrodible metal flanges will be embraced between the outer flanges when the joint is
made, and such liner flanges may be countersunk flush into the outer pipe flanges if
desired; or, I may feather-edge the ends of the liners and insert one into the other
concentrically at the joints.
:
Thus a continuous surface of similar metal being afforded, the flow of the contents
of the pipe is unimpeded.
Compound pipes constructed according to my above described improvements are
equally as strong and cheaper than-if-made wholly of-copper or brass while corrosion
is effectually prevented.

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In the construction of pipes the improvement consisting in the application
thereto of liners of non-corrodible metal substantially as and for the purposes set
forth.
2. Securing, fitting, and jointing liners of non-corrodible metal in pipes substantially
in the manner hereinbefore described.
Dated this 27th day of July 1888.
J. C. CHAPMAN, Fel. Inst. P.A.,
70, Chancery Lane, W.C.,
Agent for Applicant.