Patent US3739795A successfully refreshed from Google Patents.
US3739795A
Expired / Lapsed
US
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Method and apparatus for detecting and controlling foamability of a liquid system
Assignee: ChampionX LLC
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Filing: 1971-07-19
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Granted: 1973-06-19
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Expires: 1991-07-19
Abstract
Abstract A method of automatically detecting and controlling foamability of a liquid system, wherein conductivity probes measure foaming to automatically control the introduction of antifoam into the system, and thereby control the foamability of the liquid system. In one arrangement foaming is measured externally by feeding a split stream from the system to a vessel where foaming is synthetically generated. In another arrangement, foaming is measured directly. Apparatus for carrying out the method where foaming is generated externally includes a vessel having means for synthetically causing foaming of the liquid to simulate the foaming normally encountered in the system. A split stream is suitably taken from the system and delivered to the vessel. The foamability of the liquid is then measured in the vessel to control means for feeding a given dosage of antifoam to the liquid system, and thereby control the foamability of the system. The magnitude of foaming is measured electrically to produce a signal for driving an antifoam feed control.
Inventors
- 👤 J Hyde
- 👤 R Youngs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:19
CPC Classifications
G; G05; G05D; G05D21/00; G05D21/02; C; C10; C10G; C10G33/00; C10G33/02; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/034; Y10T137/2496; Y10T137/2499
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A method of detecting and controlling foamability of a liquid system, comprising the steps of continuously taking a split stream of liquid from the system at a given rate and feeding same to a vessel, maintaining the liquid level substantially constant, synthetically causing foaming of the liquid in the vessel, continuously detecting the foamability of the split stream by use of a plurality of conductivity probes arranged at different heights within the vessel, and continuously feeding a predetermined amount of antifoam to the system in response to the detection step to control the foamability of the system.
Claim 2
Independent Claim
97 words
A method of detecting and controlling foamability of a liquid system, comprising the steps of continuously taking a split stream of liquid from the system at a given rate and feeding same to a vessel, maintaining the liquid level substantially constant, synthetically causing foaming of the liquid in the vessel, continuously detecting the foamability of the split stream by use of a plurality of conductivity probes arranged at different heights within the vessel, and continuously feeding a predetermined amount of antifoam to the system in response to the detection step to control the foamability of the system.
Claim 3
Dependent Claim
108 words
Apparatus for detecting foamability of a liquid system and feeding antifoam thereto to maintain a predetermined foamability of the system, said apparatus comprising, means for synthetically causing foaming of the liquid including a vessel in which foam generation takes place, means continuously taking a split stream of liquid from the system at a predetermined rate and delivering same to said vessel, means for maintaining the liquid level in the vessel substantially constant, conductivity probe means in the vessel for continuously detecting the height of foam generated, and means responsive to the detecting means for automatically adding a predetermined amount of antifoam to the system to control foamability thereof.
Claim 4
Dependent Claim
108 words
Apparatus for detecting foamability of a liquid system and feeding antifoam thereto to maintain a predetermined foamability of the system, said apparatus comprising, means for synthetically causing foaming of the liquid including a vessel in which foam generation takes place, means continuously taking a split stream of liquid from the system at a predetermined rate and delivering same to said vessel, means for maintaining the liquid level in the vessel substantially constant, conductivity probe means in the vessel for continuously detecting the height of foam generated, and means responsive to the detecting means for automatically adding a predetermined amount of antifoam to the system to control foamability thereof.
Claim 5
Dependent Claim
23 words
Apparatus as defined in claim 2, wherein said means causing the synthetic foaming of the liquid in the vessel includes an air sparger.
Claim 6
Dependent Claim
138 words
In a liquid system susceptible to foaming, apparatus for detecting foamability and automatiCally feeding antifoam into the system at a rate to control foaming therein, said apparatus comprising a vessel, means feeding a split stream of liquid from the system into the bottom of the vessel, means in the vessel for synthetically generating a foam on the liquid level level of substantially the same intensity as would be generated in the system, means maintaining the liquid level substantially constant, means in the vessel above the liquid level measuring the height of the foam including a plurality of conductivity electrodes arranged at different heights, a supply of antifoam, means for injecting variable dosages of antifoam into the system, and antifoam feed control means responsive to the measured height of the foam in the vessel for controlling the injecting means.
Claim 7
Dependent Claim
138 words
In a liquid system susceptible to foaming, apparatus for detecting foamability and automatiCally feeding antifoam into the system at a rate to control foaming therein, said apparatus comprising a vessel, means feeding a split stream of liquid from the system into the bottom of the vessel, means in the vessel for synthetically generating a foam on the liquid level level of substantially the same intensity as would be generated in the system, means maintaining the liquid level substantially constant, means in the vessel above the liquid level measuring the height of the foam including a plurality of conductivity electrodes arranged at different heights, a supply of antifoam, means for injecting variable dosages of antifoam into the system, and antifoam feed control means responsive to the measured height of the foam in the vessel for controlling the injecting means.
Claim 8
Dependent Claim
56 words
The combination as defined in claim 4, wherein said foam measuring means includes high and low conductivity electrodes, and said antifoam feed control means responding to covering of the high electrode to periodically incrementally increase the antifoam dosage, while uncovering of said low electrode causes the antifoam control means to periodically incrementally decrease the antifoam dosage.
Claim 9
Dependent Claim
14 words
The combination as defined in claim 5, and means for periodically rinsing the electrodes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |