Acoustic Emission On-Line Tank Floor Inspection with TANKPAC

  • Acoustic Emission Tank Floor InspectionNo Need to Empty or Clean the Tank

  • 100% Floor Inspection

  • Verified Reliability

  • Inspection and Evaluation of Annular Ring

  • Immediate Results

  • Rapid testing: 50 meter tank in one day

  • Identify tanks that need inspection and repair

  • Leave good tanks on-line and save the shut-down and cleaning costs

Tank Floor top view and overall grade

Acoustic Emission sources in 3D view

Severe Corrosion sites analysis

Tank floor top view with locations of corrosion and/or leak sources

General tank floor grading

from A (no damage)

to E (severe damage)

3D plots of located corrosion and leak sources

Separate analysis and grading of the most severe corrosion sites



TANKPAC technology has been developed by PAC in cooperation with oil industry. It is fast "sorting" system that grades the tank floors their overall condition, without emptying or cleaning the tank.


Read more about TANKPAC from web page


The test consists of attaching sensors to the outside of the tank and monitoring for emission resulting from active corrosion of the floor. Noise sources are eliminated by sophisticated pattern recognition methods, and experienced operators.


Envirocoustics engineers go through a rigorous training and certification program and have to pass written and practical exams as well as meeting minimum experience requirements. All work is conducted under an ISO-9002 documented procedure and a site report is given following the test.


There are many refineries where TANKPAC has been used on virtually all the tanks, and the results are the key factor in determining when they need to be removed from service for maintenance. The procedure is a corporate recommended practice for many companies. Although refineries and chemical plants are the major users, the sensitivity of the method for locating active corrosion can be seen by its ability to locate corroding zinc anodes in an oilfield production tank.


Correlation of the TANKPAC overall grade with actual follow-up internal inspection shows the reliability of the method. In this case, the inspection/repair result is rated as follows:


A No damage, no repair
B Minor damage, no repair
C Damage, some repairs
D Major damage, many repairs
E Sever damage, many repairs, new floor


Careful review of all the TANKPAC information, and not just the "overall", improves the reliability. The method is being continually refined and improved as a result of the customer feedback. It is best suited to tanks that are in the same service long-term. Additional monitoring may be needed if the conditions in the tank are subject to changes as these may start/stop the corrosion process.


Cost savings depend upon tank condition. Saving the cleaning costs on 50% of your crude tanks can amount to millions, and on very clean product tanks, where many need no repair, savings can be huge when the overall cost of shutdown, cleaning, and internal inspection are taken into account.



a) Significant money savings - No money wasted for opening of good tanks.
Maintenance prioritization - The most severely damaged tanks are programmed for internal inspection first.
Ideal tool for application of risk-based inspection plans.
Prevention of environmental losses - Early identification of potential leaks.
Very fast, low-cost inspection with minimal interruption of operations and tank usage.

Acoustic Emission source location on tank floor - Top view          Acoustic Emission source location on tank floor - 3D view

TANK CARE: A complete above ground storage tank maintenance and inspection program.

  • Acoustic Emission non-instructive tank condition assesment (TankPAC).

  • Ultrasonic inspection (C-scan Imaging) of tank bottoms for Corrosion Mapping.

  • Ultrasonic B/C scan inspection of Tank walls and roofs.

  • API 653 certification.