US4174734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid flow metering tube with minimum pressure energy loss
Assignee: Henry Pratt Co LLC
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Filing: 1978-03-13
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Granted: 1979-11-20
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Expires: 1998-03-13
Abstract
Abstract To minimize loss of pressure energy in metering fluid flow by means of primary flow tube elements, the contour of the throat inlet section of the flow tube is that which produces a constant rate of acceleration of flow through the inlet to the throat section. The contour equation is given. At least in larger sizes of flow tubes, the inlet section is formed of thin metal such as stainless steel and arranged in such a way that it is not subject to mechanical stress in the installed assembly.
Inventors
- 👤 Allen C. Bradham, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:45
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/40; G01F1/44
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
In a full pipe primary element flow tube comprising an inlet section, a throat section and a recovery section, the improvement wherein the stream-defining internal contour of said inlet section is that which produces a constant rate of acceleration of flow of the fluid in flowing through said inlet section, the profile of said inlet section being defined by the following equation: ##EQU2## wherein D=section contour inlet diameter (essentially pipe diameter) d t =section contour outlet diameter (essentially throat diameter) S=section contour length S i =increment of contour length (distance from inlet of section contour) d i =diameter of contour at increment S i .
Claim 2
Dependent Claim
105 words
In a full pipe primary element flow tube comprising an inlet section, a throat section and a recovery section, the improvement wherein the stream-defining internal contour of said inlet section is that which produces a constant rate of acceleration of flow of the fluid in flowing through said inlet section, the profile of said inlet section being defined by the following equation: ##EQU2## wherein D=section contour inlet diameter (essentially pipe diameter) d t =section contour outlet diameter (essentially throat diameter) S=section contour length S i =increment of contour length (distance from inlet of section contour) d i =diameter of contour at increment S i .
Claim 3
Dependent Claim
63 words
Structure in accordance with claim 1 wherein at least the major, upstream portion of said inlet section is composed of thin metal and is supported only at the downstream end thereof whereby the same is not subjected to pipeline structural stress, said thin metal being substantially thinner than the thickness of the pipeline in which said flow tube is adapted to be installed.
Claim 4
Dependent Claim
17 words
Structure in accordance with claim 2 wherein said inlet, throat and recovery sections comprise a unitary body.
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) | 1982-11-19 | 1983-05-21 | 1983-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-19 | 1987-05-21 | 1987-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-19 | 1991-05-21 | 1991-11-20 | $7700.00 | Window Closed / Lapsed |