Improvements in the Method of and Means for Removing and Preventing Scales or Incrustations in Steam Boilers, and for the Prevention of Pitting, Corrosion, or Oxidization of such Boilers, which
Year: 1892

page_text: Date of Application, 12th Jan., 1892
Complete Specification Left, 11th Feb., 1892-Accepted, 26th Mar., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Method of and Means for Removing and
Preventing Scales or Incrustations in Steam Boilers, and for the
Prevention of Pitting, Corrosion, or Oxidization of such Boilers,
which Improvements are also applicable to the Coating of
Iron or Steel Articles generally so as to Protect them from
Oxidization.
I, JOHN DRAPER, Chemist, of 38th Street above 5th Avenue, Brooklyn, New
York, United States of America, but at present residing at 4 Albany Street,
Kelvinside, Glasgow, in the County of Lanark, North Britain, do hereby declare
the nature of this invention to be as follows:-
The object of this invention is to remove and prevent the formation of scales or
incrustations in steam boilers and for protecting the iron or steel plates of such
boilers from pitting, corrosion and oxidization, the invention being also applicable
to the coating of iron or steel articles generally so as to protect them from
oxidization.
The invention consists in the use of metallic mercury and metallic sodium or
potassium, and of an alkali or an alkaline salt (preferably carbonate of sodium or
of potassium), which when placed in a closed vessel of iron or steel containing
water, will under the action of heat and pressure deposit a thin film or coating
upon the walls of such vessel, and thereby protect same from pitting, corrosion and
oxidization, and will also prevent the forination of scales or incrustations thereon,
while in the case of boilers or other vessels upon the walls of which scales or
incrustations are already formed the use of such materials will in a comparatively
short time effectually remove same.
Further, by placing or suspending iron or steel articles generally, in the boiler
or vessel containing water into which the materials above mentioned have been
introduced, when the boiler or vessel is heated such articles will within a compara-
tively short period become coated with a thin film of such a nature as to effectually
resist oxidization, and so protect such articles.
The quantities of the materials above named which it is necessary to use are
immaterial, some excess doing no injury, and the proportions may vary within
large limits and will depend upon the nature of the water employed and other
circumstances.
Dated this 12th day of January 1899
ALLISON BROS.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Method of and Means for Removing and
Preventing Scales or Incrustations in Steam Boilers, and for the
Prevention of Pitting, Corrosion, or Oxidization of such Boilers,
which Improvements are also applicable to the Coating of
Iron or Steel Articles generally 80 as to Protect them from
Oxidization.
I, JOHN DRAPER, Chemist, of 38th Street above 5th Avenue, Brooklyn,
New York, United States of America, but at present residing at 4 Albany
Street, Kelvinside, Glasgow, in the County of Lanark, North Britain, do hereby
declare the nature of this invention and in what manner the same is to be
I Price 8d1

page_text: performed to be particularly described and ascertained in and by the following
statement :-
The object of this invention is to remove and prevent the formation of scales or
incrustations in steam boilers and for protecting the iron or steel plates of such
boilers from pitting, corrosion and oxidization, the invention being also applicable
to the coating of iron or steel articles generally so as to protect them from
oxidization.
The invention consists in the use of metallic mercury and metallic sodium or
potassium, and of an alkali or an alkaline salt (preferably carbonate of sodium or
of potassium), which when placed in a closed vessel of iron or steel containing
water, will under the action of heat and pressure deposit a thin film or coating
upon the walls of such vessel, and thereby protect same from pitting, corrosion and
oxidization, and will also prevent the formation of scales or incrustations thereon,
while in the case of boilers or other vessels upon the walls of which scales or
incrustations are already formed the use of such materials will in a comparatively
short time effectually remove same.
Further, by placing or suspending iron or steel articles generally, in the boiler or
vessel containing water into which the materials above mentioned have been
introduced, when the boiler or vessel is heated such articles will within a compara-
tively short period become coated with a thin film of such a nature as to effectually
resist oxidization, and so protect such articles.
The quantities of the materials above named which it is necessary to use are
immaterial, some excess doing no injury, and the proportions may vary within large
limits and will depend upon the nature of the water employed and other circum-
stances, but I find that 10 ozs. mercury to 1 oz. sodium, with sufficient alkali
or alkaline salt to produce an alkaline reaction in the water contained in the boiler
or vessel, will in most cases be ample for every 500 square feet of surface to be
coated.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
The employment of metallic mercury and metallic sodium or potassium, and of
an alkali or an alkaline salt, to be placed in the water contained in a steam boiler
or other closed vessel, so that under the action of pressure and heat in such boiler
or vessel a thin film will be deposited upon the inner surface thereof, so as to protect
same from pitting, corrosion or oxidization, or prevent the formation of scales or
incrustations thereon, or remove scales or incrustations from such surface should
they already exist, the invention being also applicable to the coating of iron or steel
articles (placed in the boiler or vessel) with a thin film so as to protect such articles
from oxidization, substantially as specified.
Dated this 11th day of February 1892.
ALLISON BROS.,
Agents for the Applicant.