Patent US3581714A successfully refreshed from Google Patents.
US3581714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical treating system for steam boilers
Assignee: FRANK J SMITH
•
Filing: 1969-11-17
•
Granted: 1971-06-01
•
Expires: 1989-11-17
Abstract
Abstract For chemical treatment of water in steam boilers, a separate chamber is provided for makeup water in a deaerating heater; and return condensate and makeup water are fed into the boiler in accordance with their relative water pressures at a junction, chemical feed solution is fed to the boiler strictly in proportion to the feed of makeup water without regard to the feed of return condensate. This is preferably accomplished by a chemical feed pump which has two coaxial cylinders and pistons in these cylinders connected to opposite ends of the same piston rod, providing four cylinder spaces. Two of these cylinder spaces acting in the same direction are subjected to regulated feed water pressure for the pressure stroke of the chemical feed pump, one is subjected to regulated feed water pressure for the suction stroke, and the fourth is the chemical pumping chamber.
Inventors
- 👤 Frank J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:55
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/0063
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
A system of claim 1, for supplying chemical treatment to a plurality of high pressure steam boilers, comprising in combination a chemical feed pump for each boiler and means for proportioning the discharge of the chemical feed pump for each boiler to the supply to that particular boiler of deaerated makeup water containing scale forming salts regardless of the quantity of deaerated scale free condensate being pumped to that particular boiler.
Claim 2
Dependent Claim
37 words
A system of claim 1, in which the branch passageway connected to the suction piping conveying condensate free from scale forming salts surrounds the branch passageway conveying makeup water containing scale forming salts to the suction piping.
Claim 3
Dependent Claim
31 words
A system of claim 3, in which the area of the branch passageway for conveying makeup water containing scale forming salts is equal to the internal area of the suction piping.
Claim 4
Dependent Claim
44 words
A system of claim 3, in which the peripheral area of the branch passageway for conveying condensate free from scale forming salts surrounding the branch passageway for conveying makeup water containing scale forming salts is equal to the internal area of the suction piping.
Claim 5
Dependent Claim
145 words
A system of claim 5, in which the chemical feed pump comprises two coaxial cylinders, a piston rod extending between the cylinders, packing means sealing against the piston rod between the cylinders, pistons on both ends of the piston rod, piston packing means sealing against the cylinders, means for regulating, and controlling the pressure and volume of high pressure water from the boiler feed pump, high pressure piping conveying said regulated and controlled high pressUre water, to both cylinders on sides of the pistons acting in the same direction, for the pressure stroke and a suction activating connection from the regulated and controlled high pressure pumping connection to one of the cylinders on the other side of its piston, and having a chemical pumping suction and discharge connection to the other cylinder on the side of the piston opposite to the high pressure pumping connection.
Claim 6
Dependent Claim
145 words
A system of claim 1, in which the chemical feed pump comprises two coaxial cylinders, a piston rod extending between the cylinders, packing means sealing against the piston rod between the cylinders, pistons on both ends of the piston rod, piston packing means sealing against the cylinders, means for regulating, and controlling the pressure and volume of high pressure water from the boiler feed pump, high pressure piping conveying said regulated and controlled high pressure water, to both cylinders on sides of the pistons acting in the same direction, for the pressure stroke and a suction activating connection from the regulated and controlled high pressure pumping connection to one of the cylinders on the other side of its piston, and having a chemical pumping suction and discharge connection to the other cylinder on the side of the piston opposite to the high pressure pumping connection.
Claim 7
Dependent Claim
107 words
In a chemical treating system for steam boilers, a deaerating heater having separate means for deaerating and storing condensate free from scale forming salts and makeup water containing scale forming salts, a feed water pump and connections for supplying feed water to the boiler, suction piping from the deaerating heater to the feed water pump and connections for supplying feed water to the boiler, suction piping from the deaerating heater to the feed water pump, and means for conveying the condensate free from scale forming salts to the suction piping and separate means for conveying the deaerated makeup water containing scale forming salts to the suction piping.
Claim 8
Dependent Claim
87 words
In a chemical treatment system for steam boilers, a deaerating water heater having separate chambers for deaerating and storing return condensate and makeup water containing scale forming salts, a feed water pump and connections from the feed water pump to the boiler, and suction piping from the deaerating heater communicating with the condensate chamber and the makeup water chamber and discharging condensate and makeup water to the feed water pump in proportion to the relative water pressures of the condensate and the makeup water at their junction.
Claim 9
Dependent Claim
67 words
A system of claim 9, in combination with a reciprocating chemical feed pump energized by water from the feed water pump, subjected in one direction to the regulated pressure of the water from the feed water pump acting on two different areas, and subjected in the other direction to approximately the same pressure as the regulated water pressure from the boiler feed pump acting on one area.
Claim 10
Dependent Claim
150 words
In a boiler treatment system, a boiler feed pump and connections from the boiler feed pump to the boiler, a reciprocating chemical feed pump having two coaxial cylinders, a piston rod extending through and between the cylinders, packing means sealing against the piston rod between the cylinders, and opposed pistons and piston packings at opposite ends of the piston rod, connections to both cylinders from the boiler feed pump on a side of the pistons which acts in the same direction for producing a pumping stroke of the chemical feed pump, a connection from the boiler feed pump to one of the cylinders on the opposite side of the piston to that producing the pumping stroke for producing the suction stroke of the chemical feed pump and chemical feed suction and discharge connection from the other cylinder on the opposite side of the piston from that producing the pumping stroke.
Claim 11
Independent Claim
98 words
A method of chemical treatment for steam boilers, which comprises preheating and deaerating return condensate from a boiler, separately preheating and dEaerating makeup water containing scale forming salts for the boiler, pumping to the boiler feed water which comprises a combination of condensate and makeup water depending upon the relative pressures of the condensate and makeup water at a junction, and pumping to the boiler chemical treatment solution in proportion to the feed to the boiler of makeup water containing scale forming salts without regard to the quantity of return condensate which is being fed to the boiler.
Claim 12
Independent Claim
111 words
A method of operating a chemical treatment for a boiler using a chemical feed pump having opposed cylinders, and pistons, which comprises pumping feed water to the boiler, subjecting the chemical feed pump in both cylinders on the sides of the pistons acting in the same direction to regulated pressure from the boiler feed water on the compression stroke, subjecting the chemical feed pump in one of the cylinders to regulated boiler feed water on the side of its piston opposite to that utilized in the compression stroke to accomplish the suction stroke, and pumping chemical treatment to the boiler from the other side of the piston in the other cylinder.
Claim 13
Dependent Claim
40 words
A process of claim 13, which comprises pumping the chemical treatment solution to the boiler in proportion to makeup water containing scale forming salts fed to the boiler, without regard to the quantity of return condensate fed to the boiler.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |