NDT Technology Packages


TankPAC is a surveying tool for assessing the tank bottom condition in Above Ground Storage Tanks (AST). This in-service test utilizes AE transducers mounted on the outside of the tank wall to listen to the active corrosion inside the tank. With the test results, the owner/operator can determine whether it is feasible to open the tank for decontamination and internal inspection. This method is also suitable for detecting and locating active leaks.
Storage Tank NDT Inspection
  • No Need to Empty or Clean the Tank
  • 100% Tank 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

  • TankPAC technology has been developed by Physical Acoustics Corporation (PAC), Products & Systems Division of MISTRAS Group, in cooperation with the Oil and Process industry over more than a 10 year period.

    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.

    More than 3000 tank floor tests have been carried out worldwide by MISTRAS Group and licensees. TankPAC has been used on virtually all the tanks in many refineries, 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 is clearly evident by its ability to locate corroding zinc anodes in an oilfield production tank.
    Tank Floor Damage Analysis

    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.

    MISTRAS 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, and results and records are reviewed by a MISTRAS Level III prior to final report issue.

    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:

    Tank Damage Grade Levels TANK FLOOR GRADING SCALE
    A - No Damage, No Repair
    B - Minor Damage, No Repair
    C - Damage, Some Repairs
    D - Major Damage, Many Repairs
    E - Severe Damage, Many Repairs, New Tank 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.

  • 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.
  • Total Tank Care

    TANK CARE is a complete Above Ground Storage Tank maintenance and inspection program that features...

  • TankPAC, Acoustic Emission Non-Instructive Tank Condition Assessment
  • C-Scan Imaging, Ultrasonic Inspection of Tank Bottoms for Corrosion Mapping
  • B/C-Scan, Ultrasonic Inspection of Tank Walls and Roofs
  • API-653 Certification

  • View and Download more information on Tank Care
    TankPAC is the only procedure available today for in-service testing of tank floors that has independent published verification of the results and reliability. These results are summarized from experience of tests on more than 1200 tanks.

    View and Download our Think-Tank Brochure
    View and Download our TankPAC Services Brochure

    See the papers presented at the European Conference for Nondestructive Testing by TankPAC users, available from the Petroleum Institute of France recommended practice and the link below.

    Read more about TANKPAC from NDT.net web page
    (609) 716-4000
    Sign me up for MISTRAS'
    OneSource Newsletter
    and updates
    Engineering services are not being offered and will not be rendered where prohibited by law or where the company is not licensed to provide engineering services if a license is required.
    Copyright © 1995-2017 MISTRAS Group, Inc. All Rights Reserved.  |  Privacy/GDPR  |  Terms of Use  |  Search  |  Problems or Comments? Send Feedback Feedback