Method of monitoring a leakage rate from the envelope of high vo

Details Method of monitoring a leakage rate from the envelope of high vo Method of monitoring a leakage rate from the envelope of high vo

1998-04-29

1999-03-30

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340626, 340632, 34087002, 34087005, 73 405R, G08B 2100

Patent

active

058894675

ABSTRACT:
The method consists in: i) making a series of recordings of the density of the gas at regular time intervals during a nighttime period by means of a temperature-compensated pressure sensor fixed on the outside of the envelope and communicating with the gas via a duct formed through the thickness of the envelope; ii) processing the density recordings of the gas acquired during the nighttime period in hourly intervals, each hourly interval giving rise to an hourly mean value for the density of the gas; iii) processing the hourly mean values obtained at the end of each hourly interval to give a daily mean value for the density of the gas at the end of the nighttime period; and iv) determining the leakage rate from the envelope by taking the difference between mean densities obtained at the ends of two different nighttime periods.

REFERENCES:
patent: 4041771 (1977-08-01), Allan et al.
patent: 4043180 (1977-08-01), Morris et al.
patent: 4417603 (1983-11-01), Argy
patent: 4450711 (1984-05-01), Claude
patent: 4796676 (1989-01-01), Hendershot et al.
patent: 5502435 (1996-03-01), Ralston
patent: 5719564 (1998-02-01), Sears

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