Advances in nondestructive evaluation methods for inspection of refractory concretes
Refractory concrete linings are essential to protect steel pressure boundaries from high-temperature agressive erosive/corrosive environments. Castable refractory concretes have been gaining more acceptance as information about their performance increases. Economic factors, however, have begun to impose high demands on the reliability of refractory materials. Advanced nondestructive evaluation methods are being developed to assist the refractory user. Radiographic techniques, thermography, acoustic-emission detection, and interferometry have been shown to yield information on the structural status of refractory concrete. Methods using /sup 60/Co radiation sources are capable of yielding measurements of refractory wear rate as well as images of cracks and/or voids in pre- and post-fired refractory linings up to 60 cm thick. Thermographic (infrared) images serve as a qualitative indicator of refractory spalling, but quantitative measurements are difficult to obtain from surface-temperature mapping. Acoustic emission has been shown to be a qualitative indicator of thermomechanical degradation of thick panels of 50 and 95% Al/sub 2/O/sub 3/ during initial heating and cooling at rates of 100 to 220/sup 0/C/h. Laser interferometry methods have been shown to be capable of complete mappings of refractory lining thicknesses. This paper will present results obtained from laboratory and field applications of these methods in petrochemical, steel, and coal-conversion plants.
- Research Organization:
- Argonne National Lab., IL (USA)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5242598
- Report Number(s):
- CONF-800393-1
- Resource Relation:
- Conference: Symposium on premature failure in monolithic refractory constructions: preventive and remedial treatment, Las Vegas, NV, USA, 2 Mar 1980
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
01 COAL, LIGNITE, AND PEAT
CONCRETES
CORROSION
NONDESTRUCTIVE TESTING
WEAR
REFRACTORIES
CEMENTS
COAL GASIFICATION
CONTAINERS
EROSION
FOSSIL FUELS
LINERS
PRODUCTION
STEELS
ALLOYS
BUILDING MATERIALS
CHEMICAL REACTIONS
ENERGY SOURCES
FUELS
GASIFICATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
TESTING
THERMOCHEMICAL PROCESSES
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360305 - Composite Materials- Corrosion
Erosion
& Degradation- (-1987)
420500 - Engineering- Materials Testing
010404 - Coal
Lignite
& Peat- Gasification