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Patent US3276674A successfully refreshed from Google Patents.
US3276674A
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Method for preventing surging of compressors
Assignee: Shell USA Inc
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Filing: 1964-02-26
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Granted: 1966-10-04
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Expires: 1984-02-26
Abstract
No abstract record available.
Inventors
- 👤 Antonius M Hens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:27
CPC Classifications
F; F04; F04D; F04D27/00; F04D27/02; F04D27/0207
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A METHOD FOR PROTECTING A CENTRIFUGAL COMPRESSOR FROM A SURGING BY USING A BY-PASS LINE HAVING A CONTROL VALVE DISPOSED TO CONTROL THE FLOW THROUGH THE BY-PAS 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; OBTAINING THE QUOTIENT OF THE PRESSURE LEVEL DIVIDED BY THE GAS FLOW; COMPARING THE QUOTIENT OF THE GAS FLOW AND PRESSURE LEVEL WITH A PRESET VALUE; AND OPENING THE CONTROL VALVE WHEN THE QUOTIENT VARIES FROM THE SET VALUE.
Claim 2
Independent Claim
98 words
A METHOD FOR PROTECTING A CENTRIFUGAL COMPRESSOR FROM A SURGING BY USING A BY-PASS LINE HAVING A CONTROL VALVE DISPOSED TO CONTROL THE FLOW THROUGH THE BY-PAS 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; OBTAINING THE QUOTIENT OF THE PRESSURE LEVEL DIVIDED BY THE GAS FLOW; COMPARING THE QUOTIENT OF THE GAS FLOW AND PRESSURE LEVEL WITH A PRESET VALUE; AND OPENING THE CONTROL VALVE WHEN THE QUOTIENT VARIES FROM THE SET VALUE.
References Cited (Backward Citations)
US1052172A
Cited
US1041529A
Cited
US1222352A
Cited
US2000721A
Cited
US2490188A
Cited
FR1277119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |