System for detecting cracks in the heat-insulating lining of a c

Details System for detecting cracks in the heat-insulating lining of a c System for detecting cracks in the heat-insulating lining of a c

1980-04-14

1982-03-23

Swisher, S. Clement

Measuring and testing

With fluid pressure

Leakage

220445, G01M 304

Patent

active

043206549

ABSTRACT:
A problem with tanks for storing liquefied gases is the development of cracks in the heat-insulating lining of the tank. Methods have been proposed for the detection of cracks occurring in the lining comprising passing a purging gas, for example nitrogen, through a channelled layer in the heat-insulating lining to a gas-analyzer. Contamination of the purging gas by the contents of the tank, which can be detected by the gas-analyzer, indicates the presence of a crack in the heat-insulating lining. The invention is directed to an improved design of the channelled layer, so that a uniform distribution of the purging gas along an area to be watched for the development of cracks is obtained.

REFERENCES:
patent: 3489311 (1970-01-01), Folkerts et al.
patent: 3913341 (1975-10-01), Katsuta
patent: 3921438 (1975-11-01), Katsuta
patent: 3946892 (1976-03-01), Rigal
patent: 4023617 (1977-05-01), Carlson et al.

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