Blowing-off Boilers.
Year: 1886

page_text: Blowing-off Boilers.
I, WILLIAM HEMINGWAY, of Prospect Cottage, 96 Bank Street, Morley, in the
County of York Engineer do hereby declare the nature of this invention for
IMPROVEMENTS IN THE METHOD OF AND APPARATUS FOR BLOWING OFF BOILERS
to be as follows:-
:
"
The object of this invention is to place the tap in such a position as to prevent
accidents in consequence of the sediment of the boiler feed water choking up the
taps of ordinary construction and in the ordinary position." Hitherto the blow off
tap has been placed at some little distance from the block outside the Boiler. My
improvement consists in the construction of a tap with outer shell of inverted cone
shape, the bottom terminating in a flange. The plug is made to fit the shell both
of which have an opening of the same size and configuration: when opposite to
each other the tap is open and when not opposite the tap is closed as in ordinary
taps. The flange of this tap is secured to the top of the ordinary blow off block
of a boiler but inside the boiler.
The top of the plug is prepared to receive box key of such length as to pass up
between the two tubes and out at the top of the boiler through a stuffing box.
Thus when it is desired to open the tap it can be done whilst the operator is
clear away from any liability to scalding or other accident now so common from
valves in their present position.

page_text: $
:
Improvements in
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UL
Blowing-off Boilers.
I, WILLIAM HEMINGWAY, of Prospect Cottage, 96 Bank Street, Morley, in the
County of York, 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:—
The object of this invention is to place the blow off tap in such a position as to
prevent accidents in consequence of the sediment of the feed water choking up the
connecting pipe and tap of the ordinary construction placed in the usual position
at some distance from the boiler.
My improvement consists in the construction of a tap with a flange arranged for
securing to the interior of the boiler, the shell of the tap having an opening similar
to that in the plug, the top of which is prepared for the reception of a key of such
length, that it extends through a stuffing box at the top of the boiler, from where
the tap can be operated; thus letting off the boiler with the operator clear away
from any liability to scalding or other accident, now so common with valves or
taps in their present position.
In the accompanying drawing, Fig. 1 represents a sectional elevation of a boiler
with my improved tap fitted thereto, Fig. 2 is a sectional detail of a tap suitable
. for an old boiler, and Fig. 3 the kind I prefer for new boilers.
The shell A of the tap is conical with a flange B, which, by preference is secured
to the block C, to which the blow off pipe is attached. In the said shell is fitted
a plug D, through one side of which is an opening E corresponding to an opening
through the side of the casing. On the top flange of the casing is bolted a cover F,
in which is prepared a stuffing box and gland G, adjusted by bolts in the ordinary
manner, and on the square portion H at top of plug D is fitted a box key J, the
rod of which extends through the stuffing box K at the top of the boiler, and is
prepared for the reception of a lever by which the plug can be operated, and thus
open or close the tap without standing in front of the boiler as is the case with
taps placed in the ordinary position.
In order that the plug may be turned with freedom, I relieve any pressure there
may be in the space at the top of the plug, by placing through the cover a small
pipe L, and conducting the same in any convenient direction to and through a
plate in the shell or end of the boiler, where a tap M is fixed; which on being
opened, will allow any pressure above that of the atmosphere, to escape, thereby
leaving the tap plug D free to be turned in the casing.
When the blow off block C is placed near the front end, as is generally the case
with old boilers, I prefer making the box key rod in two parts, and coupling them
together by a joint and collar somewhat as shewn at N in Fig. 2, so that on the
collar being raised clear of the joint, the box key and lower portion of the rod may
be removed from the plug, thus giving room for a person to enter the boiler.
In new boilers I prefer the blow off block to be fixed a little further from the
front end than is generally the practice, in order to give more room for a person to

page_text: get into the boiler, and dispensing with the necessity of uncoupling the box key
rod, and I also prefer to make the hole in the blow off block Ċ sufficiently large
in diameter to allow of the reception of the end P in Fig. 3, by which means, more
cover is obtained for the plug between the hole E and the bottom of the plug.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed, I declare that what
I claim is:-
The placing of a tap inside the boiler and operating the same from the top of
the boiler, the whole being constructed and arranged substantially in the manner
as shewn and described,
.