Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Reexamination Certificate
2005-10-18
2005-10-18
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
C073S195000
Reexamination Certificate
active
06955095
ABSTRACT:
A system for dispensing cryogenic liquid to a use device includes a bulk storage tank providing LNG to a sump containing a meter submerged in LNG. A temperature probe is also submerged in the LNG. A dispensing line is positioned between the meter and dispensing hose and includes a dispensing valve. A drain line bypasses the dispensing valve and features a check valve so that LNG trapped in the hose after dispensing is returned to the sump due to pressurization by ambient heat. A capacitance probe is submerged in the LNG in the sump and provides a dielectric that is compared by a microprocessor with the dielectric for pure methane at the same temperature to determine the purity of the LNG. An approximate linear relation between density and dielectric may be used to determine density and mass flow for the LNG from the measured dielectric. Alternatively, a density compensation factor based upon the dielectrics may be calculated and applied to the density of pure methane to obtain the density and mass flow of the LNG. A further alternative embodiment substitutes a compensating meter for the capacitor and the equations for the resulting two meters may be solved to determine density and mass flow for the LNG.
REFERENCES:
patent: 3933030 (1976-01-01), Forster et al.
patent: 3958443 (1976-05-01), Berrettini
patent: 4801375 (1989-01-01), Padilla
patent: 4835456 (1989-05-01), Liu et al.
patent: 5616838 (1997-04-01), Preston et al.
patent: 5682750 (1997-11-01), Preston et al.
patent: 6314981 (2001-11-01), Mayzou et al.
Bily Gilbert J.
Drube Paul A.
Drube Thomas K.
Emmer Claus D.
Gamble Jesse
Chart Inc.
DLA Piper Rudnick Gray Cary US LLP
Miller Takisha
Patel Harshad
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