An Improved Method of Securing Pads or Mattresses of Asbestos or other Fibrous or Flexible Material upon Boilers to Prevent Loss of Heat by Radiation.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
An Improved Method of Securing Pads or Mattresses of Asbestos or
other Fibrous or Flexible Material upon Boilers to Prevent Loss of
Heat by Radiation.
We, WILLIAM SWAN STALLYBRASS, of 110, Bute Street, Cardiff, South Wales,
Engineers' Factor, and HENRY COPELAND, of Brunswick Cottage, North Shields,
in the County of Northumberland, Store Manager, do hereby declare the nature
of this invention to be as follows:-
Our invention is designed to facilitate the application of pads or mattresses of
asbestos, or other fibrous or flexible non-conducting materials, to steam boilers
or similar vessels to prevent radiation of heat, and has special reference to such
application to the lower parts of marine boilers above the tops of the tanks, which
are liable to serious deterioration owing to such radiation of heat, but the method
of fitting such mattresses may be applied also to the upper parts or the backs or
fronts. The objects are to provide pads or mattresses of such convenient size that
a series will cover any surface to be protected and that all those forming a series
shall be capable of being so bound together as to leave no part of the surface
exposed to radiation, to provide for any one mattress being removed when re-
quired without disturbing the others and to allow the mattresses to be rolled so
as to pack for transit. The mattresses are made of any convenient size either
entirely of asbestos, or other fibrous or flexible material covered or not with
canvas.
On the ends of each mattress is secured a light angle iron between which and
an outside thin strap, the mattress edge is bound by small bolts with nuts, the
other arm of the angle iron standing up above the outer surface to receive bolts
which passing also through an adjacent angle iron on the next mattress and
being tightened up draw the two edges close.
In covering the lower portion of a marine boiler over the tank tops, we pro-
pose to utilise the angle iron usually rivetted along the length of the boiler shell
at each side to which to attach the angle iron on one end of the mattress, which
in such application may be in one length or of two or more lengths suitably
joined so as to stretch over the whole bottom segment of the boiler, and this end
being secured the mattress will be drawn tightly around and secured to the
opposite angle iron in close contact with the shell.
In order to enable the mattresses to be rolled for convenience of transit we
propose to dispense, as far as possible, with circumferential or transverse straps,
or, if any such are required, to make them so flexible that they will not interfere
with such rolling. We may in addition to providing for drawing the ends of
the mattresses close together also fit light angle irons or straps transversely

page_text: across the mattresses to close the sides but we do not anticipate that generally
such provision will be found necessary.
Dated this 23rd day of July 1898
T. J. DANSON, F.Inst.C.P.A.,
Agent for Applicants.
Newcastle-upon-Tyne.
An Improved Method of Securing Pads or Mattresses of Asbestos or
other Fibrous or Flexible Material upon Boilers to Prevent Loss of
Heat by Radiation.
We, WILLIAM SWAN STALLYBRASS, of 110, Bute Street, Cardiff, South Wales,
Engineers' Factor, and HENRY COPELAND, of Brunswick Cottage, North Shields',
in the County of Northumberland, Store Manager, do hereby declare the nature
of this invention and in what manner the same is to be performed to be parti-
cularly described and ascertained in and by the following statement;
Our invention is designed to facilitate the application of pads or mattresses of
asbestos, or other fibrous or flexible non-conducting materials, to steam boilers
or similar vessels to prevent radiation of heat, and has special reference to such
application to the lower parts of marine boilers above the tops of the tanks, which
are liable to serious deterioration owing to such radiation of heat, but the method
of fitting such mattresses may be applied also the upper parts or the backs
or fronts.
The objects are to provide pads or mattresses of such convenient size that a
series will cover any surface to be protected and that all those forming a series
shall be capable of being so bound together as to leave no part of the surface
exposed to radiation, to provide for any one mattress being removed when re-
quired without disturbing the others, and to allow the mattresses to be rolled so
as to pack for transit.
The mattresses are made of any convenient size, either entirely of asbestos, or
other fibrous or flexible material, covered or not with canvas. On the ends of
each mattress is secured a light angle iron, between which and an outside thin
strap, the mattress edge is bound by small bolts with nuts, the other arm of the
angle iron standing up above the outer surface to receive bolts which passing
also through an adjacent angle iron on the next mattress and being tightened
up, draw the two edges close.
In covering the lower portion of a marine boiler over the tank tops, we pro-
pose to utilise the angle iron usually rivetted along the length of the boiler shell
at cach side, to which to attach the angle iron on one end of the mattress, which
in such application may be in one length or of two or more lengths suitably
joined so as to stretch over the whole bottom segment of the boiler, and this end
being secured the mattress will be drawn tightly around and secured to the
opposite angle iron in close contact with the shell.
In order to enable the mattresses to be rolled for convenience of transit we
propose to dispense, as far as possible, with circumferential or transverse straps,
or, if any such are required, to make them so flexible that they will not interfere
with such rolling. We may in addition to providing for drawing the ends of
the mattresses close together, also to fit light angle irons or straps transversely
across the mattresses to close the sides, but we do not anticipate that generally
such provision will be found necessary.

page_text: DESCRIPTION OF DRAWINGS.
On the accompanying sheet of drawings our invention is shewn in the form
which we at present adopt in applying it to an ordinary type of marine boiler,
with some alternative methods which we may adopt.
Figs. 1 and 1 shew respectively a half back and a half front elevation, and
Fig. 2 a side elevation to an approximate scale of inch per foot, and Figs. 3,
3, 4, and 5, shew to a larger scale certain details in connection with the methods
of securing the mats with a view to their ready application and removal when
required.
Fig. 1 shews the boiler covered on bottom, sides, top, and back with mats M,
these mats extending from the angle iron A' usually provided under and round
the bottom to the corresponding angle iron A on opposite side, and from the
angle iron A round the sides and top of the boiler. Each of the circumferential
mats has upon its ends firmly secured by rivets or bolts a light angle iron B the
outer web of which is bolted to the angle iron, say A³, and then the mat under
the boiler is stretched and bolted to the opposite angle iron say A', and the same
bolt C takes the angle iron B, on the next mat and so on with each mat
covering the circumference of the boiler, and the same applies to the covering
of the back of the boiler, the mats being shaped to fit the circle and secured
together in the same way, an angle iron 13 being bolted around the back (Figs. 1
and 2) to which corresponding angle irons B, on the mats are similarly secured
by bolts C. On Fig. 1 the boiler is shewn with only the bottom over the tank
top covered with mats from the angle iron A¹ round to the angle iron A2, the
sides and top being coated with some of the well-known non-conducting compo-
sitions indicated by the letter E.
10
Referring to Fig. 2 the mats are shewn in three series M1, M2, M3, one mat of
series M being removed to shew that there is no disturbance of the others and
that it can be readily replaced, and this is one great advantage the mats have
over any compositions in allowing ready access to the boiler shell in case of a
leaking rivet or scan. The series of mats M¹ shews each mat stiffened by thin
strips S, rivetted or bolted across it in large thick mats to facilitate rolling them
for packing and transport. On series Me thin strips S, may be rivetted or bolted
along the sides of the mats or the strips may be diagonal from corner to corner,
but this interferes with rolling the mats and we prefer the transverse strips
where necessary to stiffen and consolidate the mats. Referring now
Figs. 3, 3, 4, and 5. Figs. 3, 3, shew to a scale of about inch per inch the
connection of the adjacent mats on each side of the angle irons A¹ and A
rivetted on the boiler. Fig. 4 shews the connection between any two adjacent
mats either transversely on the cylindrical part of the boiler or upon the back,
Fig. 5 having special reference to the. latter fitting by means of the angle
iron B rivetted to the back of the boiler. In each case the light angle irons on
the adjacent ends of the mat and secured to it being marked B or B2 and the
connecting bolts C. To facilitate ready fixing or removal of the mats we pro-
pose to provide slots D) (see Figs. 3, 3, 4, and 5) in the angle irons A', A2, B, B¹,
and 12, so that any one mat can be more readily detached from the adjacent
mats when required and as readily refitted.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
1st. The improved method of constructing arranging and securing mats of
asbestos or similar fibrous or flexible material for preventing loss of heat by
radiation from the external surfaces of steam boilers, having special reference
to the lower portions over the water ballast or other tanks, or to other surfaces re-
quiring protection from radiation, in such manner that the mats can be drawn
close over the surface and closed at the joints, and that any one mat can be

page_text: readily removed without disturbing the others and again replaced, substantially
as described and shewn.
2nd. The method of constructing, applying, and securing such mats to the
bottoms, sides, tops, and backs of cylindrical marine or other boilers, consisting
of the appliances, described and illustrated by the accompanying drawings.
Dated this 94th day of Auril 1899.
T. J. DANSON,
Agent for Applicants,
F.Chd.Inst.P.A.,
Newcastle-upon-Tyne.