and Air Testing Apparatus, for Testing Gas, Soil, and Drain Pipes.
Year: 1895

page_text: Date of Application, 29th Jan.,
1895
Complete Specification Left, 14th Oct., 1895-Accepted, 4th Jan., 1896
PROVISIONAL SPECIFICATION.
Gas and Air Testing Apparatus, for Testing Gas, Soil, and
Drain Pipes.
DAVID PURVES Plumber 88 Morningside Road Edinburgh ROBERT MORTON
Plumber 88 Morningside Road Edinburgh trading under the name of D. Purves
& Co. Plumbers and Gasfitters 88 Morningside Road Edinburgh do hereby declare
the nature of this invention to be as follows:-
A drum or holder similar in principal to an ordinary gas holder, is charged with
gas or air, by means of a stop cock attached to the side of holder, and near the
bottom. The holder can be adjusted to any pressure desired, by means of weights
placed on the top of drum or holder. Another pipe is attached near the bottom of
holder which is carried to a telltale, formed in the shape of a bottle. A stop cock
is fixed on pipe immediately at the top of telltale. This pipe cuters the telltale,
and dips into a fluid about of an inch, a suitable air space being kept above the level
of fluid. Another stop cock is fixed into top of telltale and attached to a tube,
which is connected to pipes, which are being tested. The joints at telltale, where
those pipes are connected, must be airtight. A byepass arrangement is connected
between the two pipes on top of telltale, to this byepass is connected a stop cock,
through which the air, under pressure in holder, is pressed into pipes under test;
thus not disturbing the fluid in telltale. When the pressure in pipes is equal to
that in holder, this stop cock is shut, and the two stop cocks connected to tubes
attached to telltale are opened; if there is a leak, the air pressure taken off the
pipes is replaced by air from holder, which passes through tube which dips into the
fluid in telltale, and forms into air bells when passing through fluid, if there is no
leak no air bells will appear, thus proving the pipes under test to be perfectly
tight.
The telltale may be made of glass, or any other suitable material.
Gas and Air Testing Apparatus, for Testing Gas, Soil, and
Drain Pipes.
DAVID PURVES, Plumber 88 Morningside Road Edinburgh ROBERT MORTON,
Plumber 88 Morningside Road Edinburgh trading under the name of D. Purves
& Coy. Plumbers and Gasfitters 88 Morningside Road 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:-
This invention has reference to and comprises a new or improved arrangement
and combination of appliances for testing gas, soil and drain pipes and indicating
if leakage exists in same. In order that this said invention and the manner of
performing or carrying the same into effect or practice may be properly understood,
there is herewith appended an explanatory sheet of drawings in which the same
14

page_text: reference letters are used to indicate corresponding parts in all the figures where
shewu.
The holder A which may be made of any proportion and similar in principle to
an ordinary gas holder, is charged with gas or air. To do this, stopcock B near
the bottom of this holder is 'opened and by gently litting the drum or float E of
this holder A the air is drawn in at stopcock B or if to be. charged with gas, a
pressure above 1" will be sufficient to lift drum or float E thus charging holder A.
On shutting stopcock B the holder A can be adjusted to any pressure desired in
proportion to size of holder A and float E by means of weights C & D placed on
the top of drum or float' E. A guiding rod F working in tube G and supported at
top by plate H keeps the drum or float E in position. A tube I is attached behind
stopcock B and carried to tell-tale K which is formed in the shape of a glass bottle.
A stopcock L is fixed on the tube immediately at the top of tell-tale.K, from this
stopcock L the tube M enters the tell-tale K and dips into a fluid N about of an
inch a suitable air space being kept above the level of fluid. Another tube O on
which stopcock P is fixed leaves the top of tell-tale K and is attached to tube Q
which is connected to pipes about to be tested at R. The joints at tell-tale K
where pipes are connected must be airtight. A byepass arrangement with
stopcock S connects the two pipes I & Q on top of tell-tale K by this byepass
stopcock S the air under pressure in holder A is passed into pipes under test
without disturbing the fluid N in tell-tale K, the stopcocks L & P being shut.
When the air in pipes under test is compressed equal to that in holder this
stopcock S is shut and the two stopcocks L & P connected to tubes attached to
tell-tale K are opened. If there is a leak, the air pressure taken off the pipes under
test is replaced by air from holder A which passing down tube M in tell-tale K
forms into air bells when passing through fluid N. If there is no leak no air bells
will appear, thus proving the pipes under test to be perfectly tight. The tell-tale K
may be made of glass or any other suitable material.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :
The arrangement and combination substantially as herein described in reference
to and shown in the accompanying drawing.
Dated this 12th day of October 1895.
DAVID PURVES.
ROBERT MORTON.