Patent US3292845A successfully refreshed from Google Patents.
US3292845A
Expired / Lapsed
US
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Method for preventing surging of compressors
Assignee: Shell USA Inc
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Filing: 1964-03-03
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Granted: 1966-12-20
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Expires: 1984-03-03
Abstract
No abstract record available.
Inventors
- 👤 Antonius M Hens
- 👤 Jelle A Landstra
- 👤 Nicholaas C Maris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:39
CPC Classifications
F; F04; F04D; F04D27/00; F04D27/02; F04D27/0207
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
A METHOD FOR PROTECTING A CENTRIFUGAL COMPRESSOR FROM SURGING BY USING A BY-PASS LINE HAVING A CONTROL VALVE DISPOSED TO CONTROL THE FLOW THROUGH THE BY-PASS LINE, THE POSITION OF THE CONTROL VALVE BEING CONTROLLED BY A CONTROL SYSTEM, SAID METHOD COMPRISING: MEASURING BOTH THE GAS FLOW THROUGH THE COMPRESSOR AND A PRESSURE LEVEL OF THE COMPRESSOR FLOW; COMPARING THE MEASURED GAS FLOW WITH THE MEASURED PRESSURE LEVEL TIMES A FIRST CONSTANT IN A FIRST CONTROLLER HAVING ONLY A NARROW PROPORTIONAL ACTION TO OBTAIN A FIRST SIGNAL; COMPARING THE MEASURED GAS FLOW WITH THE MEASURED PRESSURE LEVEL TIMES A SECOND CONSTANT IN A SECOND CONTROLLER HAVING A BROAD PROPORTIONAL AND INTEGRAL ACTION TO OBTAIN A SECOND SIGNAL; COMPARING SAID FIRST AND SECOND SIGNALS TO OBTAIN THE ONE OF SAID FIRST AND SECOND SIGNALS THAT WILL CAUSE THE LARGEST OPENING OF THE CONTROL VALVE; OPENING SAID CONTROL VALVE IN RESPONSE TO THE ONE SIGNAL.
Claim 2
Independent Claim
153 words
A METHOD FOR PROTECTING A CENTRIFUGAL COMPRESSOR FROM SURGING BY USING A BY-PASS LINE HAVING A CONTROL VALVE DISPOSED TO CONTROL THE FLOW THROUGH THE BY-PASS LINE, THE POSITION OF THE CONTROL VALVE BEING CONTROLLED BY A CONTROL SYSTEM, SAID METHOD COMPRISING: MEASURING BOTH THE GAS FLOW THROUGH THE COMPRESSOR AND A PRESSURE LEVEL OF THE COMPRESSOR FLOW; COMPARING THE MEASURED GAS FLOW WITH THE MEASURED PRESSURE LEVEL TIMES A FIRST CONSTANT IN A FIRST CONTROLLER HAVING ONLY A NARROW PROPORTIONAL ACTION TO OBTAIN A FIRST SIGNAL; COMPARING THE MEASURED GAS FLOW WITH THE MEASURED PRESSURE LEVEL TIMES A SECOND CONSTANT IN A SECOND CONTROLLER HAVING A BROAD PROPORTIONAL AND INTEGRAL ACTION TO OBTAIN A SECOND SIGNAL; COMPARING SAID FIRST AND SECOND SIGNALS TO OBTAIN THE ONE OF SAID FIRST AND SECOND SIGNALS THAT WILL CAUSE THE LARGEST OPENING OF THE CONTROL VALVE; OPENING SAID CONTROL VALVE IN RESPONSE TO THE ONE SIGNAL.
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) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |