A RESONANCE-TYPE ULTRASONIC THICKNESS GAGE FOR MEASURING THE WALL THICKNESS AND CORROSION OF CHEMICAL PLANT EQUIPMENT
Abstract
A discussion is given of the principles of thickness measurement by the ultrasonic resonance method and equipment designed for applying this technique to the measurement of the depth of corrosion in chemical equipment is described. Emphasis is placed on the proper use of transducers and coupling media for optimum results. In actual practice, certain key points should be selected for testing signal identification is best achieved with an oscilloscope, and if the resonant signal appears very often during measurements of thickness, the accuracy can be improved by taking the mean of several measurements. Some of the parameters of the Chinese model HS-1 meter, which has a maximum error of 4-4%, and an average error of 1-3% when measuring steel having a thickness of 3-30 mm, are given. At the present time, this technique cannot be used for measuring the wall thickness of small-diameter pipes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 13, 1967
- Accession Number
- AD0666138
Entities
People
- M. C. Tang
Organizations
- National Air and Space Intelligence Center