Scale Trap for Boilers and Heaters.
Year: 1899

page_text: Date of Application, 3rd Feb., 1899
Complete Specification Left, 2nd Nov., 1899-Accepted, 9th Dec., 1899
Scale Trap for Boilers and Heaters.
I, WILLIAM MURRAY BINNY, Consulting Engineer, 53, Victoria Street, West-
minster, London, do hereby declare the nature of this invention to be as
follows:-
:-
My invention relates to an apparatus for the prevention of deposition of
scale in steam boilers, in pipes leading from heaters for hot-water supply, and
for boiler feeding. It consists essentially of a loose moveable perforated pot of
cast-iron, earthenware, or other suitable material, which is inserted in a chamber
at or near the top of the heater, and through which the water must pass before
going into the hot-water supply pipes, or to the boiler, as the case may be.
The perforated pot is filled with loose porous material which has an affinity
for the deposit from the impure water from the source of supply, such as
cocoa nut fibre, hemp fibre, chalk, stone, etc. but which may depend on the
nature of the impurities in the water. A moveable cover is bolted to the
chamber, making a water-tight joint; when the said loose material in the pot
is saturated with the deposit, the cover is removed, the pot taken out, emptied.
filled with fresh material, replaced in the chamber, the cover bolted down and
the apparatus again set to work.
The fresh water from the source of supply required to make up that drawn
off, is led into, and gets heated by, the heater before it flows through the said
perforated pot.
The velocity of the water as it flows through the pot should be less than
when flowing through the hot-water supply or circulation pipes, the greatest
part of the deposition of the impurities will then take place at the pot.
The chamber containing the perforated pot may either be incorporated with
the outer casing of the heater, or be bolted direct thereto, or
may be a separate casting, the water flowing successively through the heater,
the scale trap, and the hot-water supply pipes.
Dated this 2nd day of February 1899.
convenient
ARCHD. SHARP.
Agent for the Applicant..

page_text: what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
My invention relates to an apparatus for the prevention of deposition of
scale in steam boilers, in pipes leading from heaters for hot-water supply, and
for boiler feeding. It consists essentially of a loose moveable perforated pot of
cast-iron, earthenware or other suitable material, which is inserted in a chamber
at or near the top of the heater, and through which the water must pass before
going into the hot-water supply pipes, or to the boiler, as the case may be.
The perforated pot is filled with loose porous material which has an affinity
for the deposit from the impure water from the source of supply, such as
cocoa nut fibre, hemp fibre, chalk, stone, etc., but which may depend on the
nature of the impurities in the water. A moveable cover is bolted to the
chamber, making a water-tight joint; when the said loose material in the pot
is saturated with the deposit, the cover is removed, the pot taken out, emptied,
filled with fresh material, replaced in the chamber, the cover bolted down and
the apparatus again set to work.
Or, instead of a moveable perforated pot, I may use two perforated plates
which can be quickly detached and fastened to the said chamber when the
cover is off, the two plates retaining between them the said porous material.
The fresh water from the source of supply required to make up that drawn
off, is led into, and gets heated by, the heater before it flows through the said
perforated pot, the direction of its flow is shewn by the arrows in Figs. 1 and 2.
The velocity of the water as it flows through the pot should be less than
when flowing through the hot-water supply or circulating pipes, the greatest
part of the deposition of the impurities will then take place at the pot.
The chamber containing the perforated pot may either be incorporated with
the outer casing of the heater, or be bolted direct thereto, or if convenient
may be a separate casting, the water flowing successively through the heater,
the scale trap, and the hot-water supply pipes.
The following drawings are intended to illustrate more clearly the nature of
my invention. Figure 1 is a sectional view of a scale trap bolted direct to a
heater. The chamber C is provided with a flange f₁ for fastening to the
heater, with a flange f, to which the cover D is bolted, and a branch pipe for
connecting the line of pipes. The pot P has a perforated bottom and a small
flange which rests against an internal flange of the chamber C; while a
loose lid L rests on the top of and retains the loose material in the pot. The
loose lid may be pressed down by a spring abutting against the cover D, or by an
adjustable screw passing through the cover.
Figure 2 is a sectional view of a complete scale trap intended to be placed
at any convenient position in the line of pipes. The chamber C is provided
with a flange f, to which the cover D is bolted, with two ports p, and p, con-
necting the opposite ends of the chamber C to short flanged pipes to be
bolted to the pipe line, and ledges against which the perforated plates P, and 'P
rest. The loose porous material is placed between the said perforated
plates P₁ and P2.
1
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:-
1. A scale trap for preventing deposit in boilers or in heating pipes,
consisting of a chamber containing loose porous material, through which the
hot-water flows at a less speed than in other parts of the system.
2. In a scale trap for preventing deposit in boilers or in heating pipes
and radiators, the combination of a suitable chamber through which the hot
water flows slowly, of a perforated pot or a pair of perforated plates retaining
suitable loose porous material, and of a movable door for the purpose of

page_text: removing the said porous material when charged with deposit; substantially
as described in Figures 1 and 2.
3. A scale trap to be combined with a heater; substantially as described and
illustrated in Figure 1
ARCHD. SHARP, Assoc.M.Inst.C.E.,
47, Victoria Street, Westminster, S.W., Agent for the Applicant.