US4590790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for determining the accuracy of a gas measurement instrument
Assignee: AMERICAN MTER Co A ORP OF
•
Filing: 1985-05-16
•
Granted: 1986-05-27
•
Expires: 2005-05-16
Abstract
Abstract A meter in a high pressure gas pipeline is calibrating using a sonic nozzle in series with the meter. A bypass line is run where measurements are made to determine gas composition dependent factors for use in defining the flow through the nozzle.
Inventors
- 👤 Irwin A. Hicks
- 👤 Robert S. Jacobsen
- 👤 David F. Kee
- 👤 George W. Schneider, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:59
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/66; G01F25/00; G01F25/10; G01F25/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
A method for determining the accuracy of a gas measurement instrument in a high pressure pipeline, comprising the steps of: (a) providing a first critical flow device in series with said instrument; (b) determining for a second, smaller, critical flow device its coefficient of discharge-throat area factor (C ds A ts ) using a known gas and a Bell prover where ##EQU8## and Z b C*√R is a known quantity for said known gas; (c) determining the factor C 1 *Z 1 √R 1 for the gas in said pipeline by the steps of: (c1) providing a bypass line from said pipeline; (c2) providing a meter in said bypass line; (c3) installing said second critical flow device in said bypass line immediately downstream from said meter; (c4) measuring the volume of gas (V 1 ) passing through said meter in a given times (t 2 ); and (c5) calculating ##EQU9## (d) measuring the volume (V m ) through said instrument during a predetermined time (t) with a meter pressure (P m ) and temperature (T m ) and a first device pressure (P n ) and temperature (T n ); and (e) calculating the percent accuracy of said instrument as ##EQU10##
Claim 2
Independent Claim
201 words
A method for determining the accuracy of a gas measurement instrument in a high pressure pipeline, comprising the steps of: (a) providing a first critical flow device in series with said instrument; (b) determining for a second, smaller, critical flow device its coefficient of discharge-throat area factor (C ds A ts ) using a known gas and a Bell prover where ##EQU8## and Z b C*√R is a known quantity for said known gas; (c) determining the factor C 1 *Z 1 √R 1 for the gas in said pipeline by the steps of: (c1) providing a bypass line from said pipeline; (c2) providing a meter in said bypass line; (c3) installing said second critical flow device in said bypass line immediately downstream from said meter; (c4) measuring the volume of gas (V 1 ) passing through said meter in a given times (t 2 ); and (c5) calculating ##EQU9## (d) measuring the volume (V m ) through said instrument during a predetermined time (t) with a meter pressure (P m ) and temperature (T m ) and a first device pressure (P n ) and temperature (T n ); and (e) calculating the percent accuracy of said instrument as ##EQU10##
References Cited (Backward Citations)
US749645A
Cited
US4432230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |