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ANDT Oil and Gas Brochure - MISTRAS Group, Inc.

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TANKS 2<br />

TankPAC<br />

Specific tank related damage mechanisms are:<br />

• Internal <strong>and</strong> external corrosion of roofs,<br />

floors <strong>and</strong> shells<br />

• Weld <strong>and</strong> weld heat affected zone<br />

integrity<br />

• Structural deficiencies (Settlement<br />

Surveys, Out of Roundness, Strapping)<br />

Advanced techniques used to determine the above<br />

damage mechanisms are:<br />

ACOUSTIC EMISSION TANKPAC<br />

<strong>MISTRAS</strong> utilizes a proprietary methodology for<br />

evaluating the condition of tank floors using<br />

Acoustic Emission (AE) while the tank is in service.<br />

An overall condition assessment is performed <strong>and</strong><br />

individual areas of concern are noted to pinpoint<br />

follow up areas to inspect during a subsequent<br />

Out of Service inspection.<br />

TALRUT: ULTRASONIC TANK ANNULAR LONG<br />

RANGE INSPECTION<br />

Utilizing our proprietary LSI system, we are able<br />

to generate semi-quantitative data regarding the<br />

tank floor integrity adjacent to the shell to floor<br />

weld. This inspection technique encompasses<br />

approximately 10” into the tank floor from the<br />

exterior of the tank using an ultrasonic technique<br />

<strong>and</strong> a proprietary algorithm. The annular area of<br />

the tank is critical to the support structure, <strong>and</strong><br />

safe operation of the tank.<br />

TALRUT<br />

www.mistrasgroup.com | +1.609.716.4150 | sales@mistrasgroup.com<br />

TIME-OF-FLIGHT-DIFFRACTION (TOFD)<br />

Ultrasonic TOFD is a rapid survey tool used to<br />

evaluate the shell <strong>and</strong>/or roof weld <strong>and</strong> weld heat<br />

affected zone looking for original fabrication type<br />

defects, or in service corrosion occurring in the<br />

heat affected zone. Follow up phased array inspection<br />

may be required in any area that exhibits<br />

potential damage discovered through the TOFD<br />

inspection.<br />

AUTOMATED ULTRASONIC LSI<br />

The ultrasonic LSI is a rapid erosion/corrosion<br />

scanning tool used for ultrasonic “drops” down<br />

the tank shell or the roof. The device is magnetically<br />

attached to the tank <strong>and</strong> operated remotely.<br />

The amount <strong>and</strong> quality of data is far superior to<br />

ultrasonic thickness readings, in that actual trending<br />

can be visualized as in the case of liquid to air<br />

interface corrosion. In the case of roof readings,<br />

the ability to attach the scanner enhances the<br />

safety of the project, as there is no need to access<br />

the roof by inspection personnel.<br />

C e n t e r s o f E xc e l l e n c e<br />

Tank Inspection<br />

LSI<br />

• Avoid opening tanks <strong>and</strong> eliminate<br />

costs associated with cleaning <strong>and</strong><br />

waste disposal.<br />

• <strong>Inc</strong>rease probability of detecting<br />

corrosion using LSI high speed<br />

corrosion mapping<br />

• Enhance safety using remote crawlers<br />

on roofs.

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