An Apparatus for Producing Extra Pressure in the Testing of Drain and other Pipes.
Year: 1894

page_text: Date of Application, 12th Nov., 1894
Complete Specification Left, 12th Aug., 1895-Accepted, 12th Nov., 1895
PROVISIONAL SPECIFICATION.
An Apparatus for Producing Extra Pressure in the Testing of Drain
and other Pipes.
ANDREW HARKESS Sanitary Engineer 94 Albert Street Edinburgh N.B., do
hereby declare the nature of this invention to be as follows:
A hollow cylinder or movable float, encircling a vertical tube enclosed within an
outer casing, containing water or other liquid.
The extra pressure is produced by means of the said cylinder or movable float
being immersed in water, &c., to a depth regulated to suit the test required.
The above apparatus can be easily attached to drain or pipe testing machines.
Dated this Tenth day of November 1894.
An Apparatus for Producing Extra Pressure in the Testing of Drain
and other Pipes.
ANDREW HARKESS Sanitary Engineer 6 Wallis Place, Easter Road, Leith,
late of 94 Albert Street Edinburgh 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 :-
An apparatus consisting of an outter casing, incircling a vertical tube and a hollow
cylinder or moveable float regulated to suit the pressure required. The outer
casing is filled with water or other liquid, air is then forced into the apparatus
which raises the float and thus produces a regulated pressure. A Figure 1. is
an outer casing, or chamber with hinged lid which is formed of copper or other
material. B is a small tube for the admission of air, which enters the casing A.
at a point near the bottom, and passes up through the centre, terminating above
the level of the pipe D. which acts as an overflow pipe from casing A. C is a
hollow cylinder, or moveable float, encircling the vertical pipe B. which is enclosed
within the outer casing A, the length & weight of which is regulated to suit
the extra pressure required. E. Fig. 1. is also a hollow cylinder, or moveable
float which is regulated to a pressure less than the ordinary water seal of a
drain, sink or water closet trap. To apply this apparatus the casing A. is filled
with water, or other liquid, the float C. is removed and the float E Fig. 1. is placed
in position over the pipe B. the end of which is attached to the connecting pipe
between the bellows, (pump, or other positive blower) and the drain to be tested.
All openings require to be plugged up. Air is then forced into the drain, or pipes,
they are thoroughly tight, the float E will be forced up and will remain
stationary in a raised position as C is shewn in Fig. 3. but if the slightest leakage
exists the float will instantly fall. The float E. is then removed and the float C.
is placed in position over the pipe B. All traps being plugged up air is then
forced into the drain. The the liquid inside of the float C will be forced in a
downwards direction to a point at F. Fig. 1. when the float C. will be forced
nd

page_text: upwards (which increases the pressure fourteen (14) times) and must be kept in this
raised position, which will produce and maintain a regulated pressure all over the
internal surface of the drain or pipe. To instantly discover the points when
the leakages exist, pass a wet cloth or brush over the pipes & joints, when the
defects will be apparent by the air bells on the outer surface of the drains or
pipes, as well as a hissing sound which can be heard several feet off.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declair that what I
claim is
The formation of the apparatus the combination of the outer casing, air
admission tube, & float of small diameter which produces & regulates the pressure,
it acts as an indicator of leakages, which instantly indicates the smallest leakage
to the operator at the apparatus, which cannot be discovered by any other drain
testing machine at present in use, drains can be tested although wholly immersed
in water.
Dated this Ninth day of August 1895
ANDREW HARKESS.