US4522056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for measuring Reid Vapor Pressure
Assignee: Chevron USA Inc
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Filing: 1983-08-26
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Granted: 1985-06-11
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Expires: 2003-08-26
Abstract
Abstract A method and apparatus for measuring Reid Vapor Pressure, as defined in the ASTM D-323 procedure, of liquid hydrocarbon materials wherein a sample of material is drawn from a sample can into a sample chamber containing a bellows and then to a measuring chamber. An expansion chamber, containing a bellows, connects with a measuring chamber for adjusting the amount of air within the measuring chamber and for setting the pressure within the measuring chamber before introduction of the sample so that RVP measurement occurs at the appropriate pressure.
Inventors
- 👤 Thomas G. Chin
- 👤 Arthur Alston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:16
CPC Classifications
G; G01; G01N; G01N7/00; G01N7/14; G01N7/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
150 words
An apparatus for measuring the Reid Vapor Pressure of a liquid hydrocarbon material comprising: first compartment maintained at a substantially fixed temperature about the range of 32° F. to 40° F.; a second compartment maintained at a substantially fixed temperature of about 100° F.; means, within said first compartment, for providing a sample of the liquid hydrocarbon material; a sample chamber within said first compartment; first means for connecting said means for providing a sample and said sample chamber; a measuring chamber within said second compartment; second means for connecting said sample chamber and said measuring chamber; an expansion chamber within said second compartment; third means for connecting said measuring chamber and said expansion chamber; means, associated with said measuring chamber, for measuring pressure; and means, coupled to said means for measuring pressure for providing an output indicative of the vapor pressure of a sample of the liquid hydrocarbon material.
Claim 2
Independent Claim
150 words
An apparatus for measuring the Reid Vapor Pressure of a liquid hydrocarbon material comprising: first compartment maintained at a substantially fixed temperature about the range of 32° F. to 40° F.; a second compartment maintained at a substantially fixed temperature of about 100° F.; means, within said first compartment, for providing a sample of the liquid hydrocarbon material; a sample chamber within said first compartment; first means for connecting said means for providing a sample and said sample chamber; a measuring chamber within said second compartment; second means for connecting said sample chamber and said measuring chamber; an expansion chamber within said second compartment; third means for connecting said measuring chamber and said expansion chamber; means, associated with said measuring chamber, for measuring pressure; and means, coupled to said means for measuring pressure for providing an output indicative of the vapor pressure of a sample of the liquid hydrocarbon material.
Claim 3
Dependent Claim
14 words
The apparatus as recited in claim 1 wherein said expansion chamber comprises a bellows.
Claim 4
Dependent Claim
14 words
The apparatus as recited in claim 2 wherein said sample chamber comprises a bellows.
Claim 5
Dependent Claim
12 words
The apparatus as recited in claim 3 further comprising a sequence controller.
Claim 6
Dependent Claim
33 words
The apparatus as recited in claim 4 wherein said first and second means for connecting comprise valve and conduit systems and wherein said sequence controller directs operation of said valve and conduit systems.
Claim 7
Dependent Claim
45 words
The apparatus as recited in claim 5 further comprising air and water input systems and fourth means for connecting said input systems to said sample chamber and to said measuring chamber in order to prepare said sample and measuring chambers for measurement of said sample.
Claim 8
Dependent Claim
45 words
The apparatus as recited in claim 6 wherein said input systems are connected to said sample chamber and said measuring chamber, in a sequence determined by said sequence controller in order to purge said sample container, said measuring chamber and said second means for connecting.
Claim 9
Dependent Claim
44 words
The apparatus as recited in claim 7 wherein said input systems are connected to said sample and said measuring chambers in sequence by said sequence controller in order to provide water saturated air in preparation for measurement of the vapor pressure of said sample.
Claim 10
Dependent Claim
26 words
The apparatus as recited in claim 8 wherein said means for providing a sample comprises a sample can removably connected to said first means for connecting.
Claim 11
Independent Claim
145 words
A method for measuring Reid Vapor Pressure of a liquid hydrocarbon material comprising the steps of: filling a sample chamber at a temperature within the range of about 32° F. to about 40° F. with a sample of the liquid hydrocarbon; preparing a measuring chamber at about 100° F. and atmospheric pressure; reducing the pressure of and the amount of air within said measuring chamber so that, after introduction of said sample, air within said measuring chamber is in an appropriate amount and at an appropriate pressure by (a) connecting said measuring chamber to an expansion chamber, (b) expanding said expansion chamber, and (c) disconnecting said measuring chamber from said expansion chamber; transferring said sample of the liquid hydrocarbon from said sample chamber to said measuring chamber; and measuring vapor pressure within said measuring chamber, after equilibration, as the Reid Vapor Pressure of said sample.
Claim 12
Independent Claim
145 words
A method for measuring Reid Vapor Pressure of a liquid hydrocarbon material comprising the steps of: filling a sample chamber at a temperature within the range of about 32° F. to about 40° F. with a sample of the liquid hydrocarbon; preparing a measuring chamber at about 100° F. and atmospheric pressure; reducing the pressure of and the amount of air within said measuring chamber so that, after introduction of said sample, air within said measuring chamber is in an appropriate amount and at an appropriate pressure by (a) connecting said measuring chamber to an expansion chamber, (b) expanding said expansion chamber, and (c) disconnecting said measuring chamber from said expansion chamber; transferring said sample of the liquid hydrocarbon from said sample chamber to said measuring chamber; and measuring vapor pressure within said measuring chamber, after equilibration, as the Reid Vapor Pressure of said sample.
Claim 13
Dependent Claim
21 words
The method as recited in claim 10 wherein said expanding step is effected by moving a bellows within said expansion chamber.
Claim 14
Dependent Claim
21 words
The method as recited in claim 11 wherein said filling step is effected by moving a bellows within said sample chamber.
Claim 15
Dependent Claim
25 words
The method as recited in claim 12 further comprising the step of shaking said sample within said measuring chamber in order to effect said equilibrium.
Claim 16
Dependent Claim
25 words
The method as recited in claim 12 further comprising the step of producing water-saturated air at 100° F. and atmospheric pressure in said measuring chamber.
Claim 17
Dependent Claim
67 words
The method as recited in claim 14 wherein said sample has a volume, V S , wherein said measuring chamber has a volume, 5 V S , and wherein said expanding step comprises the step of adjusting expansion of said expansion chamber so that said total volume of said measuring and expansion chambers is equal to 6.25 times the volume of said sample within said measuring chamber.
References Cited (Backward Citations)
US2200261A
Cited
US2540337A
Cited
US2671341A
Cited
US2764017A
Cited
US2815660A
Cited
US2866339A
Cited
US3037375A
Cited
US3191428A
Cited
US3263491A
Cited
US3360980A
Cited
US3385772A
Cited
US3491585A
Cited
US3499317A
Cited
US3528439A
Cited
US3528440A
Cited
US3937063A
Cited
US3901062A
Cited
SU779860A1
Cited
US4332159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |