An Improved Safety Contrivance for Relieving Abnormal Pressure. within Domestic, Hot Water, and other Boilers.
Year: 1895

page_text: Date of Application, 22nd Feb., 1895.
Complete Specification Left, 22nd Nov., 1895-Accepted, 4th Jan., 1856
PROVISIONAL SPECIFICATION.
An Improved Safety Contrivance for Relieving Abnormal Pressure.
within Domestic, Hot Water, and other Boilers.
I, WILLIAM. STANDING, of 10 Leinster Street, Dublin, Engineer, do hereby
declare the nature of this invention to be as follows:-
This invention is more especially applicable to boilers used for supplying hot
water and has for its object to provide simple and efficacious means that can be
readily applied to the boilers, whereby, in the event of a stoppage occurring in
the water circulation pipes due to frost or other cause, the excessive pressure
resulting from such stoppage will effect the rupture of a burstable adjunct which
normally keeps an exit permanently closed, and thus permit of the escape of the
accumulated steam and the water in such a manner as to avoid any risk of scalding
or otherwise injuring persons who may happen to be in proximity to the boiler at
the time the rupture of said burstable adjunct takes place.
In carrying out: my invention I may employ a screw socket having a lateral
opening to which the before mentioned burstable adjunct is rigidly connected, said
screw socket being advantageously interposed between the inlet or the outlet pipe
and the boiler. This burstable adjunct is advantageously made in the form of a
copper tube closed at that end remote from the socket but open at the other end.
where it is affixed to the lateral opening. This tube thus constitutes a cylindrical
pocket which is always in cominunication with the boiler and is consequently.
subjected internally to the same pressure as that within the boiler. Surrounding
this cylindrical pocket and adapted to be screwed into the aforesaid lateral opening
is: a tubular chamber or casing which is open at its free end and is of such
dimensions as to leave an annular space around the said cylindrical pocket which
space by means of the open end of the tubular chamber or casing communicates
with a pipe or conduit leading to any desired outlet. The walls of the said
cylindrical pocket. are made of such a thickness and the pocket is of such a length
that in the event of the pressure within the boiler exceeding a certain predeter-
mined amount the pocket will become ruptured and thus give passage to the steam
and the water which will escape into the before mentioned enclosing casing and
flow harmless away, through the aforesaid pipe or outlet:.
Dated this 22nd day of February 1895
HASELTINE, LAKE &. Co.,,
45 Southampton Buildings, London, W.C.,. Agents for the Applicant.
An Improved. Safety, Contrivance for Relieving Abnormal Pressure
within Domestic, Hot Water, and other Boilers.
1, WILLIAM STANDING; of 10 Leinster Street, Dublin, 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 safety contrivance for use with domestic
hot-water and other boilèrs the said contrivance being so constructed that in the

page_text: event of a stoppage occurring in the water circulation pipes due to frost or other
cause, the excessive pressure resulting from such stoppage will cause the rupture
of a burstable portion of the contrivance and permit of the harmless escape of the
accumulated steam and the hot water through a suitable outlet.
In order that my said invention may be clearly understood and readily carried
into effect I will proceed to describe the same more fully with reference to the
accompanying drawing in which
Figure 1 is an elevation of an advantageous construction of my safety
contrivance.
Figure 2 a vertical central section thereof, and
Figure 3 a transverse section on the line 1. 1. of Figure 2.
A is a screw threaded socket which is, in the construction illustrated, adapted
to be affixed to the boiler. B is the burstable portion of the contrivance and C is
an outer tube or casing which forms a chamber surrounding the burstable portion
and communicates at its upper end with a suitable outlet pipe.
The burstable portion B consists preferably of a copper tube closed at its outer
end and provided at its open end with a screw threaded piece 6' for enabling the
said tube to be firmly connected to the nozzle A which is internally tapped for its
reception. This burstable tube is thus always in communication with the boiler
and is consequently subjected internally to the same pressure as that within the
boiler. The said piece b' is also formed with a hexagonal flange 62 to permit of
its being conveniently tightened up by means of a spanner.
The outer tube or casing C is adapted to screw on to the socket A and
is of such internal diameter as to leave an annular space around the burstable
tube B.
The tube is made of such a thickness relatively to its length that in the event of
the pressure within the boiler becoming excessive, the burstable tube will be
ruptured and allow the steam and water within the boiler to enter the surrounding
casing C from which they flow harmlessly away through the aforesaid outlet pipe
connected to the top of the casing.
In this manner 1 avoid any risk of scalding or otherwise injuring persons who
may happen to be in proximity to the boiler when the rupture of the burstable
tube takes place.
In some cases the safety contrivance instead of being situated vertically on the
boiler can be located laterally on one of the water circulation pipes.
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 1
claim is:
1. A safety contrivance for domestic and other boilers, consisting of a burstable
tube or chamber communicating with the boiler and of a surrounding tube or casing
communicating with a suitable outlet substantially as described.
2. The safety contrivance for domestic and other boilers, having its parts con-
structed and arranged substantially as described with reference to the accompanying
drawing.
Dated this 22nd day of November 1895
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.