An Improved Composition for the Removal of Scale in Steam Boilers.
Year: 1899

page_text: Date of Application, 22nd Dec., 1899-Accepted, 22nd Dec., 1900
COMPLETE SPECIFICATION.
An Improved Composition for the Removal of Scale in Steam Boilers.
I, THEODOR RÜMLER, of the Railway Station, Ducherow, in the Empire of
Germany, Postmaster, 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 the present invention is to provide means for preventing the
formation of boiler scale and sediment.
The boiler scale which forms either an incrustation adhering to the sides of the
boiler or a powdery loose sediment is a consequence of the nature of the feed-
water. The composition of the boiler scale is dependent upon the character of the
feed-water.
All the known methods for preventing the formation of boiler scale have I
consider proved to be ineffective; this is especially the case with the so called
scum catchers and other appliances placed in the interior of the boiler.
The effort has long been persisted in of purifying the feed-water by destroying
by chemical means the components of the feed-water which go to form the boiler
scale in which perfect success has not as yet been attained.
The composition herein described I consider will absolutely prevent all forma-
tion of boiler scale and is made as follows:-
Take 152 parts of quartz powder, 57 parts calcined soda and 30 parts of potash.
mix these ingredients with an equal quantity, by weight, of water, viz. 239 parts
and boil down to 33%. The product thus produced is an exceedingly effective
lye for preventing boiler scale.
It is applied as follows:-
=
In filling say a boiler of about 900 cubic feet of water capacity one litre
1 kilo-
grammes, of the lye is added for each 15 pounds pressure per square inch in the
boiler to the feed-water and with the water thus prepared work may be carried
on daily for 6 or 8 weeks. 14 days before the boiler is put out of use to be cleaned
the same quantity of the lye is to be added through the feedpump to the water in
the boiler. By this procedure the separated boiler scale will lie at the bottom of the
boiler as mud when the boiler is blown out and can then be easily withdrawn from
the boiler with a scoop or rake. If any part of the scale should adhere as a scaly
incrustation to the sides of the boiler it can be easily removed with a scraper. If
the feed water is very dirty the strength of the lye may be increased by 50% and
then it will be certain that no scale will be formed.
The remedy is completely effective and does not attack the boiler plates in any
way since there is no corroding fluid contained in the lye.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:-
1. A composition for preventing the formation of boiler scale comprised of
152 parts of quartz-powder 57 parts calcined soda and 50 parts potash mixed

page_text: together with an equal quantity by weight of water and boiled down to 33%, to
be added to the feed water when the boiler is being filled and again 14 days before
it is put out of use.
Dated this 20th day of December 1899.
WM. P. THOMPSON & Co.,
6, Bank Street. Manchester, Patent Agents