Patent US3708245A successfully refreshed from Google Patents.
US3708245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot oil leak detection
Assignee: Mobil Oil AS
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Filing: 1970-07-31
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Granted: 1973-01-02
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Expires: 1990-07-31
Abstract
Abstract This specification discloses a method and apparatus for pumping hot fluids and for detecting leaks of the hot fluids. An application of this invention is in hot oil pumps of gasoline absorption plants. Detection of leaks of hot oil due to pump seal failure is sensed and a signal is produced. This signal may be used for such things as shutting down the pump and giving an alarm.
Inventors
- 👤 S King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:57
CPC Classifications
F; F04; F04D; F04D15/00; F04D15/02; F04D15/0245; F04D15/0263; F04D7/00; F04D7/02; F04D7/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
89 words
A system for detecting leaks of fluid from a hot fluid pump having a shaft passing through a fluid pump seal, the combination comprising: a pneumatic temperature sensor for producing a pressure signal in response to a specified temperature, said pneumatic temperature sensor being located adjacent and exteriorly of said seal and in a position to detect leaks of fluid through said seal; means for controlling said pump in response to said pressure signal; and a pneumatic line connecting said temperature sensor with said means for controlling said pump.
Claim 2
Independent Claim
89 words
A system for detecting leaks of fluid from a hot fluid pump having a shaft passing through a fluid pump seal, the combination comprising: a pneumatic temperature sensor for producing a pressure signal in response to a specified temperature, said pneumatic temperature sensor being located adjacent and exteriorly of said seal and in a position to detect leaks of fluid through said seal; means for controlling said pump in response to said pressure signal; and a pneumatic line connecting said temperature sensor with said means for controlling said pump.
Claim 3
Independent Claim
111 words
A system for detecting leaks of fluid from a hot fluid pump having a shaft passing through a fluid pump seal, comprising: a pneumatic temperature sensor for producing a pressure signal in response to a specified temperature, said pneumatic temperature sensor being located adjacent and exteriorly of said seal and in a position to detect leaks of fluid through said seal; means for generating a signal in response to said pressure signal; a pneumatic line connecting said temperature sensor with said means for generating said signal; and a prime mover and control means therefor and means connecting said means for generating a signal to said control means to operate said pump.
Claim 4
Independent Claim
111 words
A system for detecting leaks of fluid from a hot fluid pump having a shaft passing through a fluid pump seal, comprising: a pneumatic temperature sensor for producing a pressure signal in response to a specified temperature, said pneumatic temperature sensor being located adjacent and exteriorly of said seal and in a position to detect leaks of fluid through said seal; means for generating a signal in response to said pressure signal; a pneumatic line connecting said temperature sensor with said means for generating said signal; and a prime mover and control means therefor and means connecting said means for generating a signal to said control means to operate said pump.
Claim 5
Dependent Claim
13 words
The system of claim 2 wherein said means is a pressure electric switch.
Claim 6
Dependent Claim
12 words
The system of claim 2 wherein said means is a pneumatic relay.
Claim 7
Dependent Claim
23 words
The apparatus of claim 2 wherein said temperature sensor has a set point temperature within the range of 200* F. to 500* F.
Claim 8
Dependent Claim
52 words
The apparatus of claim 5 wherein said set point temperature is within the range of 200* F. to 300* F. 7 The apparatus of claim 6 further comprising locating a portion of said pneumatic line adjacent said shaft, said portion having a melting point within the range of 250* to 300* F.
Claim 9
Dependent Claim
172 words
The apparatus of claim 7 wherein said portion is polyethylene tubing. 9 In a plant having a vertical oil pump for pumping hot oil with a shaft passing through a pump seal, the combination comprising: a pneumatic temperature sensor for producing a pressure signal in response to a specified temperature within the range of 200* to 300* F., said temperature sensor being located above said seal and in a poSition to detect leaks of hot oil through said seal; an electric pressure switch for generating an electric signal; a plastic tubing having a melting point within the range of 250* to 300* F. located above said seal and pneumatically connecting said temperature sensor with said switch and maintaining said switch open with pneumatic pressure whereby an electric signal is generated upon a reduction of said pneumatic pressure by said sensor reaching said specified temperature and by melting of said tubing; and a prime mover and control means therefor and means connecting said electric signal to said control means to operate said pump.
Claim 10
Dependent Claim
120 words
In a process of pumping hot fluid with a fluid pump having a shaft passing through a fluid pump seal, the steps comprising: sensing the temperature adjacent and exteriorly of said seal with a pneumatic temperature sensor; producing a pressure signal in response to said temperature sensor being exposed to a predetermined temperature; transmitting said pressure signal through a pneumatic line connecting said temperature sensor with an electric pressure switch; generating an electric signal with said switch in response to said pressure signal; and transmitting said electric signal through an electrical conductor to a prime mover and control means therefor, said prime mover being connected with said pump whereby said prime mover is operated in response to said electric signal.
Claim 11
Dependent Claim
120 words
In a process of pumping hot fluid with a fluid pump having a shaft passing through a fluid pump seal, the steps comprising: sensing the temperature adjacent and exteriorly of said seal with a pneumatic temperature sensor; producing a pressure signal in response to said temperature sensor being exposed to a predetermined temperature; transmitting said pressure signal through a pneumatic line connecting said temperature sensor with an electric pressure switch; generating an electric signal with said switch in response to said pressure signal; and transmitting said electric signal through an electrical conductor to a prime mover and control means therefor, said prime mover being connected with said pump whereby said prime mover is operated in response to said electric signal.
Claim 12
Dependent Claim
18 words
The process of claim 10 wherein said predetermined temperature is within the range of 200* to 500* F.
Claim 13
Dependent Claim
18 words
The process of claim 11 wherein said predetermined temperature is within the range of 200* to 300* F.
Claim 14
Independent Claim
177 words
A system for detecting leaks of fluid from a hot fluid pump having a shaft passing through a fluid pump seal, the combination comprising: a pneumatic temperature sensor having a set point within the range of 200* to 300* F. and being pressurized with gas to produce a pressure signal in response to a specified temperature, said pneumatic temperature sensor being located adjacent and exteriorly of said seal and in a position to detect leaks of fluid through said seal; means for generating a signal in response to said pressure signal; a pneumatic line pressurized with gas connecting said pneumatic temperature sensor with said means for generating a signal, said pneumatic line having a portion thereof which has a melting point within the range of 250* to 300* F., said portion of said pneumatic line being located adjacent said shaft and within the flow path of fluids leaking through said pump seal; and a prime mover and control means therefor and means connecting said means for generating a signal to said control means to operate said pump.
Claim 15
Independent Claim
177 words
A system for detecting leaks of fluid from a hot fluid pump having a shaft passing through a fluid pump seal, the combination comprising: a pneumatic temperature sensor having a set point within the range of 200* to 300* F. and being pressurized with gas to produce a pressure signal in response to a specified temperature, said pneumatic temperature sensor being located adjacent and exteriorly of said seal and in a position to detect leaks of fluid through said seal; means for generating a signal in response to said pressure signal; a pneumatic line pressurized with gas connecting said pneumatic temperature sensor with said means for generating a signal, said pneumatic line having a portion thereof which has a melting point within the range of 250* to 300* F., said portion of said pneumatic line being located adjacent said shaft and within the flow path of fluids leaking through said pump seal; and a prime mover and control means therefor and means connecting said means for generating a signal to said control means to operate said pump.
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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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |