US3610208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler protective system
Assignee: Individual
•
Filing: 1969-07-25
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Granted: 1971-10-05
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Expires: 1989-07-25
Abstract
Abstract A safety device for indicating when the water level is critically low in a steam boiler makes use of the fact that steam in a boiler becomes superheated when the boiler water level falls below the boiler''s uppermost fire tubes. The present apparatus measures the steam temperature and the steam pressure and compares the two to determine whether they are related to one another in accordance with the temperature-pressure characteristic of saturated steam. If the measurements are not so related, the safety device initiates appropriate corrective action to prevent damage to the boiler.
Inventors
- 👤 Douglas E Penning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:44
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/42
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
152 words
A safety device for preventing overheating of a saturated steam boiler of the type including an enclosed vessel, a heat source, a liquid reservoir within said enclosed vessel, and one or more fire tubes positioned within said enclosed vessel beneath the surface of said liquid reservoir during normal operation of said boiler, said fire tubes communicating with said heat source for applying heat to said reservoir from beneath the surface thereof, said safety device comprising means for measuring the temperature of steam in said boiler, means for measuring the pressure of steam in said boiler, means for comparing said temperature measurement and said pressure measurement for determining whether said measurements are related in accordance with the known temperature-pressure characteristics of saturated steam, and means operative when said measurements are not related substantially in accordance with said known temperature-pressure characteristics for cooling the fire tubes exposed above the surface of said liquid reservoir.
Claim 2
Dependent Claim
152 words
A safety device for preventing overheating of a saturated steam boiler of the type including an enclosed vessel, a heat source, a liquid reservoir within said enclosed vessel, and one or more fire tubes positioned within said enclosed vessel beneath the surface of said liquid reservoir during normal operation of said boiler, said fire tubes communicating with said heat source for applying heat to said reservoir from beneath the surface thereof, said safety device comprising means for measuring the temperature of steam in said boiler, means for measuring the pressure of steam in said boiler, means for comparing said temperature measurement and said pressure measurement for determining whether said measurements are related in accordance with the known temperature-pressure characteristics of saturated steam, and means operative when said measurements are not related substantially in accordance with said known temperature-pressure characteristics for cooling the fire tubes exposed above the surface of said liquid reservoir.
Claim 3
Dependent Claim
57 words
A safety device in accordance with claim 1 wherein said comparing means includes means for converting one of said measurements to an expected value of the other of said measurements in accordance with the temperature-pressure characteristic of saturated steam and means for comparing said other measurement with said expected value for determining whether they are substantially equal.
Claim 4
Dependent Claim
24 words
A safety device in accordance with claim 2 wherein said one measurement is said pressure measurement and said other measurement is said temperature measurement.
Claim 5
Dependent Claim
26 words
Apparatus as defined in claim 1 including means for activating a warning device when said measurements are not related in accordance with said known temperature-pressure characteristic.
Claim 6
Dependent Claim
83 words
A safety device for preventing overheating of a saturated steam boiler comprising means for measuring the temperature of steam in said boiler, means for measuring the pressure of steam in said boiler, means for comparing said temperature measurement and said pressure measurement for determining whether said measurements are related in accordance with the known temperature-pressure characteristics of saturated steam, and means for limiting the application of heat to said boiler when said measurements are not related in accordance with said known temperature-pressure characteristics.
Claim 7
Dependent Claim
83 words
A safety device for preventing overheating of a saturated steam boiler comprising means for measuring the temperature of steam in said boiler, means for measuring the pressure of steam in said boiler, means for comparing said temperature measurement and said pressure measurement for determining whether said measurements are related in accordance with the known temperature-pressure characteristics of saturated steam, and means for limiting the application of heat to said boiler when said measurements are not related in accordance with said known temperature-pressure characteristics.
Claim 8
Independent Claim
95 words
A method for preventing damage in a saturated steam device comprising the steps of: a. measuring the temperature of said steam, b. measuring the pressure of said steam, c. converting one of said measurements to an expected value of the other measurement in accordance with the known pressure-temperature characteristic of saturated steam, d. comparing said expected value to said other measurement to determine when said measurements are different by more than an acceptable amount, and e. limiting the application of heat to said device when said measurements are different by more than said acceptable amount.
Claim 9
Independent Claim
95 words
A method for preventing damage in a saturated steam device comprising the steps of: a. measuring the temperature of said steam, b. measuring the pressure of said steam, c. converting one of said measurements to an expected value of the other measurement in accordance with the known pressure-temperature characteristic of saturated steam, d. comparing said expected value to said other measurement to determine when said measurements are different by more than an acceptable amount, and e. limiting the application of heat to said device when said measurements are different by more than said acceptable amount.
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |