US5905208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System and method measuring fluid flow in a conduit
Assignee: LODKHEED MARTIN IDAHO TECHNOLOGIES
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Filing: 1996-10-03
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Granted: 1999-05-18
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Expires: 2016-10-03
Abstract
Abstract A system for measuring fluid mass flow in a conduit in which there exists a pressure differential in the fluid between at least two spaced-apart locations in the conduit. The system includes a first pressure transducer disposed in the side of the conduit at a first location for measuring pressure of fluid at that location, a second or more pressure transducers disposed in the side of the conduit at a second location, for making multiple measurements of pressure of fluid in the conduit at that location, and a computer for computing the average pressure of the multiple measurements at the second location and for computing flow rate of fluid in the conduit from the pressure measurement by the first pressure transducer and from the average pressure calculation of the multiple measurements.
Inventors
- 👤 Marcos German Ortiz
- 👤 Terrel G. Kidd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:19
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/363; G01F1/20; G01F1/206; G01F1/72; G01F1/74; G01F1/76; G01F1/78; G01F1/80; G01F1/86; G01F1/88
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
183 words
A method for measuring fluid flow in a conduit having an abrupt bend in which there is a pressure differential between two locations in the conduit, the method comprising the steps of: (a) positioning a first pressure transducer in the side of the conduit at a first of the two locations, to measure pressure of fluid in the conduit; (b) positioning two or more second pressure transducers at a second of the two locations, to carry out a plurality of pressure measurements of fluid in the conduit; (c) a computer computing the average pressure from the plurality of pressure measurements, and (d) a computer computing flow rate of fluid in the conduit in accordance with the formula, ##EQU7## where mf is the flow rate in kilograms per second, B is a proportionality constant, D is the diameter of the conduit in meters, ρ is the fluid density in kilograms per cubic meter, α is the angle of the change of direction of the conduit at the bend, and ΔP is the pressure difference between the first pressure transducer and the average pressure calculation.
Claim 2
Independent Claim
183 words
A method for measuring fluid flow in a conduit having an abrupt bend in which there is a pressure differential between two locations in the conduit, the method comprising the steps of: (a) positioning a first pressure transducer in the side of the conduit at a first of the two locations, to measure pressure of fluid in the conduit; (b) positioning two or more second pressure transducers at a second of the two locations, to carry out a plurality of pressure measurements of fluid in the conduit; (c) a computer computing the average pressure from the plurality of pressure measurements, and (d) a computer computing flow rate of fluid in the conduit in accordance with the formula, ##EQU7## where mf is the flow rate in kilograms per second, B is a proportionality constant, D is the diameter of the conduit in meters, ρ is the fluid density in kilograms per cubic meter, α is the angle of the change of direction of the conduit at the bend, and ΔP is the pressure difference between the first pressure transducer and the average pressure calculation.
Claim 3
Dependent Claim
140 words
A method as in claim 1 further comprising the steps of (e) positioning a third pressure transducer in a side of the conduit to measure pressure, (f) positioning a fourth pressure transducer in the conduit, at an elevation above that of the third pressure transducer, to measure pressure, and wherein said computing step further comprises (g) computing the density ρ of fluid flowing in the conduit in accordance with the formula ##EQU8## where g is the gravitational constant, H is the elevational distance in meters of the fourth pressure transducer above the third pressure transducer, and ΔP 2 is the pressure difference measured between the third pressure transducer and the fourth pressure transducer, and (h) computing the flow rate of fluid in the conduit in accordance with the formula of step (d), using the density ρ computed in step (g).
Claim 4
Independent Claim
172 words
A method for measuring fluid flow in a conduit having a gradual arc in which there is a pressure differential between two locations in the conduit, the method comprising the steps of: (a) positioning a first pressure transducer in the side of the conduit at a first of the two locations, to measure pressure of fluid in the conduit; (b) positioning a second or more pressure transducers at a second of the two locations, to carry out a plurality of pressure measurements of fluid in the conduit; (c) a computer computing the average pressure from the plurality of pressure measurements, and (d) a computer computing flow rate of fluid in the conduit in accordance with the formula, ##EQU9## where mf is the mass flow in kilograms per second, R is the radius of curvature of the arc, D is the diameter of the conduit in meters, ρ is the fluid density in kilograms per cubic meter, and ΔP is the pressure difference between the first pressure transducer and the average pressure calculation.
Claim 5
Independent Claim
172 words
A method for measuring fluid flow in a conduit having a gradual arc in which there is a pressure differential between two locations in the conduit, the method comprising the steps of: (a) positioning a first pressure transducer in the side of the conduit at a first of the two locations, to measure pressure of fluid in the conduit; (b) positioning a second or more pressure transducers at a second of the two locations, to carry out a plurality of pressure measurements of fluid in the conduit; (c) a computer computing the average pressure from the plurality of pressure measurements, and (d) a computer computing flow rate of fluid in the conduit in accordance with the formula, ##EQU9## where mf is the mass flow in kilograms per second, R is the radius of curvature of the arc, D is the diameter of the conduit in meters, ρ is the fluid density in kilograms per cubic meter, and ΔP is the pressure difference between the first pressure transducer and the average pressure calculation.
References Cited (Backward Citations)
US970965A
Cited
US1181490A
Cited
US1963011A
Cited
US1905558A
Cited
GB432416A
Cited
US3067611A
Cited
US3777549A
Cited
US3855545A
Cited
US4074573A
Cited
US4144754A
Cited
DE2828129A1
Cited
US4197740A
Cited
US4277832A
Cited
US4581934A
Cited
FR2565344A1
Cited
US4625553A
Cited
US4625548A
Cited
US4856344A
Cited
JPH0238817A
Cited
US5323661A
Cited
US5597020A
Cited
US5337603A
Cited
US5400657A
Cited
US5591922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-05-17 | 2002-11-16 | 2003-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-05-17 | 2006-11-16 | 2007-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-05-17 | 2010-11-16 | 2011-05-18 | $7700.00 | Window Closed / Lapsed |