Inspectioneering
Inspectioneering Journal

Specific Application NDE Method Leads to Development of Novel Microwave NDE Technique

By Bob Stakenborghs, P.E. at Evisive Inc.. This article appears in the January/February 2005 issue of Inspectioneering Journal

Several years ago, a need was identified to develop an improved nondestructive inspection method to volumetrically inspect dielectric materials. Specifically, an inspection method for detecting defects in rubber expansion joints was needed to assist in preventing leaks in large electric power plant steam condensers. In response to this demand, a microwave based inspection technique was developed and patented by Evisive, Inc. Once the technique was developed and tested, it was found to be a powerful NDE technique that had uses for many dielectric materials. The technique can also be successfully used on composite materials containing conductive components but whose construction makes them overall nonconductors or bulk dielectrics, for example, carbon fiber composites.

Expansion Joint Inspection

Most steam-cycle electric power plants employ rubber expansion joints between the condenser and the turbine. The expansion joints have multiple composite layers. Typical dimensions for such an expansion joint are in the neighborhood of 40 meters (131') circumference, by 25 cm (9.8") wide, by 1 cm (0.4") thick. Under normal operating conditions, there is a vacuum on the inside of the joint, and 1 atm pressure on the outside. Thus when such a joint fails, it is prone to fail catastrophically.

This content is available to registered users and subscribers

Register today to unlock this article for free.

Create your free account and get access to:

  • Unlock one premium article of your choosing per month
  • Exclusive online content, videos, and downloads
  • Insightful and actionable webinars
GET STARTED
Interested in unlimited access? VIEW OUR SUBSCRIPTION OPTIONS

Current subscribers and registered users can log in now.


Comments and Discussion

There are no comments yet.

Add a Comment

Please log in or register to participate in comments and discussions.


Inspectioneering Journal

Explore over 20 years of articles written by our team of subject matter experts.

Company Directory

Find relevant products, services, and technologies.

Job Postings

Discover job opportunities that match your skillset.

Event Calendar

Find upcoming conferences, training sessions, online events, and more.

Industry News

Stay up-to-date with the latest inspection and asset integrity management news.

Blog

Read short articles and insights authored by industry experts.

Asset Intelligence Reports

Download brief primers on various asset integrity management topics.

Videos

Watch educational and informative videos directly related to your profession.