Method of detecting imperfections in a heat-insulating lining
First Claim
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1. A method of detecting imperfections in a heat-insulating lining of foamed material of a wall enclosing a space suitable for cryogenic uses, comprising locally cooling the surface of the lining by scanning with a jet of cooled gas and observing the lining for imperfections in the cooled state.
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Abstract
A method of detecting imperfections in a heat-insulating lining of foamed material of the wall of a space suitable for cryogenic uses by cooling the surfaces of the lining by scanning with a jet of cooled gas and observing the lining for imperfections in the cooled state.
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Citations
6 Claims
- 1. A method of detecting imperfections in a heat-insulating lining of foamed material of a wall enclosing a space suitable for cryogenic uses, comprising locally cooling the surface of the lining by scanning with a jet of cooled gas and observing the lining for imperfections in the cooled state.
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5. A method for detecting a crack or split in a foamed lining on the inner surface of a wall of a tank utilized for transporting a cold liquid comprising temporarily and locally cooling the surface of the foamed lining with a jet of cooled gas in order to cause the surface to contract and thereby render the crack or split visible without magnification and marking the crack or split while it remains visible.
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6. A method for detecting a crack or split in a foamed plastic material in which the crack or split enlarges upon cooling of the material by subjecting the material to temporary and local cooling whereby the crack or split becomes visible as the plastic material shrinks and the crack or split widens, and marking the crack or split while the plastic is in the cooled state.
Specification