US3577733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid loading of steam turbines
Assignee: General Electric Co
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Filing: 1969-05-08
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Granted: 1971-05-04
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Expires: 1989-05-08
Abstract
Abstract A method for loading a steam turbine and transferring from full arc to partial arc admission during loading while maintaining a constant rate of heating, so as to eliminate the cooling and reheating which previously took place during a transfer at constant load.
Inventors
- 👤 Eric Manuel
- 👤 James H Moore Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:39
CPC Classifications
F; F01; F01D; F01D17/00; F01D17/10; F01D17/12; F01D17/18; F01D19/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
The method of rapidly loading a steam turbine to rated load, said turbine initially having all the control valves for its first stage wide open, its main stop valve closed, and its bypass valve open just enough for no load turbine operation at synchronous speed; said method comprising (1) loading the turbine on said bypass valve only at a specified rate of heating of said first stage to a bypass valve condition not yet fully open; (2) making a transition from full arc to partial arc control by simultaneously closing said control valves in sequence and opening said bypass valve further at a rate controlleD to maintain said specified rate of first stage heating; (3) and after the transition has been made to partial arc control, loading the turbine to rated load on said control valves at a rate which maintains said specified rate of first stage heating.
Claim 2
Independent Claim
148 words
The method of rapidly loading a steam turbine to rated load, said turbine initially having all the control valves for its first stage wide open, its main stop valve closed, and its bypass valve open just enough for no load turbine operation at synchronous speed; said method comprising (1) loading the turbine on said bypass valve only at a specified rate of heating of said first stage to a bypass valve condition not yet fully open; (2) making a transition from full arc to partial arc control by simultaneously closing said control valves in sequence and opening said bypass valve further at a rate controlleD to maintain said specified rate of first stage heating; (3) and after the transition has been made to partial arc control, loading the turbine to rated load on said control valves at a rate which maintains said specified rate of first stage heating.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein differential metal temperatures of said first stage are used for controlling the operators for all said valves.
Claim 4
Dependent Claim
28 words
The method of claim 1 wherein the steam pressure in the valve chest is used as a representation of temperatures for controlling the operators for all said valves.
References Cited (Backward Citations)
US3338053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |