Patent US4861233A successfully refreshed from Google Patents.
US4861233A
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Compressor surge control system
Assignee: Elsag International BV
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Filing: 1988-05-11
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Granted: 1989-08-29
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Expires: 2008-05-11
Abstract
Abstract A surge control system (16) is provided for a compressor (14) which anticipates the actual surge condition and initiates anti-surge protection in proportion to the magnitude of the anticipated surge condition. This is done by providing a feed foward signal (20) to a summing station (48) along with a normally generated surge control line point (44) to offset this point (44) by an amount determined by the feed forward signal (20). This offset point (50) is used as an input to a controller for controlling the bypass valve (28) in a bypass loop (30) around the compressor (14).
Inventors
- 👤 Donald J. Dziubakowski
- 👤 Marion A. Keyes, IV
- 👤 Jeremiah J. Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:26
CPC Classifications
F; F04; F04D; F04D27/00; F04D27/02; F04D27/0207
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
189 words
A surge control system for a centrifugal compressor having an associated surge line and a bypass line and being connected to a base load machine to provide a combined output therewith comprising: first means for establishing a main surge control line a predetermined distance from the centrifugal compressor surge line and identifying a point thereon as a function of the pressure differential across the centrifugal compressor and across an orifice in the inlet line of the centrifugal compressor; a second means for establishing a feed forward control signal based on a demand variation on the base load machine connected to the centrifugal compressor which may cause a surge condition in the centrifugal compressor; summing means for combining the signals of said first and second establishing means to provide an anticipatory surge control line offset from the main surge control line of said first means in proportion to the magnitude of the signal from said second means and a control signal indicative thereof; and bypass valve control means connected to said summing means for varying the amount of bypass across the centrifugal compressor in response to the control signal therefrom.
Claim 2
Dependent Claim
189 words
A surge control system for a centrifugal compressor having an associated surge line and a bypass line and being connected to a base load machine to provide a combined output therewith comprising: first means for establishing a main surge control line a predetermined distance from the centrifugal compressor surge line and identifying a point thereon as a function of the pressure differential across the centrifugal compressor and across an orifice in the inlet line of the centrifugal compressor; a second means for establishing a feed forward control signal based on a demand variation on the base load machine connected to the centrifugal compressor which may cause a surge condition in the centrifugal compressor; summing means for combining the signals of said first and second establishing means to provide an anticipatory surge control line offset from the main surge control line of said first means in proportion to the magnitude of the signal from said second means and a control signal indicative thereof; and bypass valve control means connected to said summing means for varying the amount of bypass across the centrifugal compressor in response to the control signal therefrom.
Claim 3
Dependent Claim
36 words
A surge control system as set forth in claim 1 wherein said second means includes a control station for varying the base load on the combined output of the base load machine and the centrifugal compressor.
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) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |