Rutledge has extended its current operations and services to further cater to the needs of our Clients by providing comprehensive Tube Inspection/ Evaluation services. We have introduced an advanced and innovative tool in the field of Non-Destructive Testing that uses Acoustic Waves to evaluate the integrity of tubes in heat exchangers, boilers, chillers, reactors etc.

Our technicians, with the help of a computerized inspection system and advanced software, are able to detect internal tube flaws such as holes/leakages, blockages, erosions and pitting with a great deal of precision and speed (less than 10 seconds per tube!). Monitoring your tubes condition will help you increase your productivity and efficiency.

What is APR?

Acoustic Pulse Reflectometry is a technology dealing with propagation of specially designed acoustic waves in tubes. Changes in the tube cross-section generate reflections. Identifying and analyzing those reflections enable monitoring of the tube integrity. This analysis is based on the fact that every defect has its unique signature. This is schematically shown below along with a schematic of reflection signatures of typical flaws such as holes/leakages.

Schematic of Probe

Signature Type of Defects

Powerful Inspection Technology:

This is a powerful, advanced and innovative system that is easy to operate, capable of self-analyzing and generation reports. Due to the advanced software we can get Instantaneous Inspection Results. Since the technology does not require a physical traversal of a probe to the entire length of the tube and since the acoustic pulse is traveling in the air inside the tubes and not on the wall material, it is not depended on the tube configuration and conformation – any tube material (SS, copper, nickel, brass, pvc) with any shape (fin-fan, u-tube, s-shape, Y/T joints) can be inspected.

Why APR?

Fast: 10-20 times faster than any other inspection technology
The existing NDT techniques like Eddy Current testing, can take about 5-30 minutes to inspect tubes depending on the tube length. However the APR system can inspect tubes in less than 10 seconds irrespective of their length.
Able to inspect complex tube formation: u-tubes, u-tube bends, fin fans, y & t joints
The main challenge faced by current NDT techniques is the physical probe being stuck in u bends, t joints of complex tube geometries. But, APR inspection is effective in these scenarios as sound waves are used as virtual probes.

Tubes of any material can be inspected: ferromagnetic and non-ferromagnetic materials
Current NDT techniques like Eddy Current Testing, MPI can be carried out for specific materials with specific properties. APR can inspect tubes of any material like plastic, graphite because the system makes use of sound waves as a probe.

Clean and Green: Environment Preservation
Unlike Radiographic Testing that uses radioactive material, this system is clean because it uses sonic waves as a virtual probe.

Typical Applications:

The technology deployed by Rutledge can provide inspection services to industries that have heat exchangers, boilers, chillers, reactors. Some of them are:

Power Industry Steel & Metal Industry
Chemical Industry Pharmaceutical Industry
Food and Beverage Air conditioning (HVAC) Industry
Oil & Gas Offshore Industry Marine
Refineries/Petrochemical Industry

Affiliate Companies

Ready Oilfield