An Improved Asbestos Felt Covering for Boilers, Steam-tubes, Ship-walls, and the like.
Year: 1899

page_text: Date of Application, 6th July, 1899-Accepted, 7th Oct,, 1899
An Improved Asbestos Felt Covering for Boilers, Steam-tubes,
Ship-walls, and the like.
I, CARL LAMPRECHT, Kronprinzenstrasse, of Stettin, in the Kingdom of Prussia,
German Empire, Manufacturer, 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 present invention relates to an asbestos-felt covering for boilers, steam-
tubes, ship-walls and the like. The essential feature of my invention is, that I
provide ribs upon the asbestos plates and owing to these, the covering is of greater
durability, than the felt plates usually employed for similar purposes. The ribs
and the hollow spaces between these ribs prevent the conduction of heat to the
outside and prevent the radiation of the same, so that the parts insulated by my
improved covering never can be heated considerably this being a chief feature
as it is of great importance for some objects never to become hot, for instanco
' ammunition rooms.'
وو
My invention will be the better understood with reference to the accompanying
drawing, in which:
Figure 1 illustrates a vertical section through an asbestos covering according
to my invention, the cover having the ribs on one side.
Figures 2-4 represent asbestos-felt plates in section and plan, the plate illus-
trated in Figure 2 having the ribs arranged on both sides, the plate of Figure 3
having them crosswise arranged, lastly the covering illustrated in Figure 4 is
provided on the surface with little bearers of asbestos.
Figures 5-10 illustrate my improved asbestos cover applied for covering the
walls of boilers, steam-tubes, ships and the like.
In Figures 5 & 6 the covering has the ribs on one side, in Figures 7 to 10 the
plates are provided on both sides with riba; Figure 5 represents a transverse
section through a covered tube; Figure 6 represents a section through a corner
part of a ship-side wall, the wall being covered at the inside, Figures 7 & 8
represent parts of a tube and of a boiler in section and top-view Fig. 8 being
partly a horizontal section on line a (Fig. 7), and Figures 9 & 10 represent a
corner of a boiler covered at the outside, partly in top view and partly in section.
Fig. 9 partly illustrates a section on line 3 of Fig. 10 while the latter figure repre-
sents a vertical section on line y of Fig. 9.
a is a felt-plate provided on both sides with a layer of asbestos b and c, the
upper layer being somewhat thicker in diameter than the lower layer c
(Figures 14). Eventually the upper layer b may be replaced by a layer of
asbestos board (Figure 1). Upon the layer 6 or r bevelled ribs e are arranged
in convenient intervals and running parallel to another. The ribs may be pro-
vided either on one side only (Figure 1) or on both sides (Figure 2).
The ribs of the lower layer c may run parallel to the ribs of the upper layer
or they may run rectangular to the same (Figure 2). The ribs may also be pro-
vided on one side only running parallel and rectangular to another, so as to form
a grating eg (Figure 3). The asbestos may also be arranged in form of little
bearers (Fig. 4) of round or square form, upon the felt plate a.

page_text: These felt-plates a being covered either on one side or on both sides with ribs e
or eg or bearers h are manufactured in pieces of one to two square meters of a
thickness of 10-50 mm. Then the whole is formed correspondingly to the wall
of the boiler, tube or ship to which the covering is to be applied: In order to
effect the covering of objects with plates having the ribs on one side (Figures 5
& 6), the plates a with the ribs e or eg.or bearers are placed upon the wall of
the tube or boiler (Figure 5) or upon the wall of the ship s (Figure 6). The
different plates must be arranged one beside the other, so that the whole offers
a smooth surface, the ribs leaning against the walls. Eventually the wall of the
object to which the felt cover is to be applied, firstly is covered with a layer of
asbestos (Figure 6) upon which layer my improved asbestos covering is placed
in order to attain a greater security. The smooth surface of my asbestos cover-
ing then is provided with a metal cover m, the cover having the purpose to protect
the asbestos from the outside.
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As the asbestos ribs e, eg and bearers as well as the upper asbestos layer
and the board r are bad conductors of heat, the heat of the boiler or the tube
cannot reach the felt-plate a, but circulates within the insulating spaces d without
heating or coking the felt. The radiated heat of the boiler and of the tube is
retained or at least is weakened' immensely.
In order to insulate completely, the effect of the heat, a double felt cover
(Figures 7-10) is employed whereby the walls are covered with a ribbed felt
plate a and above this plate a second felt plate a is arranged, which is ribbed on
one side, the ribs e or the bearers h leaning against the first layer of felt plate.
A similar arrangement is represented in Figure 9. In this figure a felt plate a
having ribs on both sides is applied to the wall to be covered and a second felt
plate having the ribs only on one side is located above the first plate. It is
advantageous to cover the second plate by the protecting metal cover m.
In this double cover the inner felt layer retains the warmth of the boiler whilst
the second felt layer forms an intermediate space i advantageously brought into
connection with the outer air by perforations provided in the metal cover m or by
openings (Figures 7 & 8). The atmospheric air entering the intermediate
space i mixes with the hot inner air and cools the same to such an extent that the
radiated heat is not able to heat the second felt-wall and to influence the surround-
ings of the boiler or tube wall' El.
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:
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1. As a new product of manufacture, an asbestos felt cover consisting of
nsbestos plates being provided either on one or on both sides with parallel ribs for
the purpose as described.
2. As a new product of manufacture, asbestos plates provided with ribs cross-
wise arranged either on one or on both sides of the plates, for the purpose as
described.
3. As a new product of manufacture, asbestos plates provided with bearers of
asbestos arranged in convenient intervals upon the plates; for the purpose as
described.
Dated
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