An Improved Non-conducting Covering for Pipes and other Heated Surfaces.
Year: 1890

page_text: Date of Application, 5th Aug., 1890-Accepted, 6th Sept., 1890
COMPLETE SPECIFICATION.
An Improved Non-conducting Covering for Pipes and other Heated
Surfaces.
I, HENRY WARD JOHNS, of The Dakota Apartment House, 72nd Street and '8th
Avenue, New York City, New York, United States of America, Manufacturer and
Merchant, do hereby declare the nature of my invention for NON-CONDUCTING COVERING
FOR PIPES AND OTHER HEATED SURFACES and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:
My invention relates to a new and useful non-conducting covering for heated
surfaces specially intended for use on pipes, boilers, &c., and it consists of wood pulp,
or wood pulp and sawdust, treated or combined with fire proof or fire proofing
material, and when in plastic state made into substantially the form of the surface to
be protected. It may be cut lengthwise so as to be opened in halves or otherwise, for
easy application to pipes &c. Also the covering may be additionally fire proofed by
an interior lining of a fire proof coating cement or asbestos or similar sheet and it
may also be provided with an outer covering of the same materials. The accompanying
drawing represents a section of one of my pipe coverings.
To the wood pulp or wood pulp mixed with sawdust may be added comminuted of
chopped cork, sponge, hay or straw, hair or other equivalent material which will
reduce the weight and add either to the strength, porosity, or the air containing
character of the product. The special means or apparatus by which I form the pulp
with or without admixture of these other bodies into tubular or other form constitutes
no part of my present invention and will not therefore be described. It may be made
in any known way.
To the covering A the interior lining B is attached; it is preferably composed of a
sheet of asbestos having an asbestos nap or flock upon the surface which comes next
to the pipe. This lining may however be in the form of a fire proof cement or layer,
1 prefer it to be an asbestos cement, but it may be of magnesia, various clays,
infusorial or diatomececus earth, plaster of Paris, mineral wool or any other suitable
material, either fire proof or partially fire proof, or rendered so by treatment or
admixture with fire proofing material,
(is an exterior coating or layer of a fire proofing or partially fire proof material
which may be either in the form of a sheet, as for instance a sheet of asbestos paper,
or in the form of a layer of cement. This exterior layer not only preserves the
covering and renders it additionally fire proof, but it also acts as a wholly or partially
air tight casing or jacket, whereby the non-conducting properties of the covering are
increased.
I prefer to fire proof the covering by treating the material of which it is made,
whether pulp or pulp with other bodies admixed, or by treating the product after it is
made, or at any stage in the manufacture with a suitable fire proofing material
preferably but not necessarily in liquid form. The entire body of the non-con-
ducting covering may be so treated or only its inner or outer surface or both as
preferred.
It
D represents an outside covering of canvas or such other material as may be pre-
ferred, which I sometimes apply as an additional protection. The outside of the non-
conducting covering may be decorated or waterproofed in any preferred manner.
will be obvious that when the surface to be covered is that of a boiler or other large
surface, whether flat or curved, that the non-conductor will be made substantially to
conform to the surface to which it is to be applied.

page_text: 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 :-
First A non-conducting covering composed essentially of wood pulp mixed with
sponge or other fibrous or porous material, and treated with fire proofing material,
substantially as set forth.
Second A non-conducting covering composed essentially of wood pulp mixed
with sponge or other fibrous or porous material, and having an interior lining or layer
of substantially fire proof material, substantially as set forth.
Third A non-conducting covering composed essentially of fire proofed wood
pulp, and having an inner layer or lining of fire proof material, substantially as set
forth.
Fourth-A non-conducting covering composed essentially of wood pulp made into
substantially the form of the surface to be protected and having an interior fire proof
lining or layer and an exterior covering or jacket, substantially as set forth.
Dated this 9th day of July 1890.
HENRY WARD JOHNS.