Zetec, Inc

Ultrasonic Testing: Calibration Standards and Options


Courtesy of Zetec, Inc

One only needs to look at the size of flaws NDT testing can locate to see why ultrasonic testing calibration is vital. This equipment is highly sensitive and often used in rough conditions—but can still find even the smallest crack or air bubble to prevent asset loss. Calibration is a means of ensuring reliable readings so equipment sensitivity remains high. 

Calibration is a central component of NDT equipment maintenance, followed by firmware updates and preventative care. With these three policies in place, companies can extend the life of their equipment and minimize downtime for testing. However, it can be challenging to meet all the needs for ultrasonic calibration and maintenance in-house. In some cases, it’s wise to outsource these tasks to an experienced third party who can keep equipment running at peak performance.

Ultrasonic Testing: Calibration Standards and Options

The Basics of Ultrasonic Testing Calibration

A reading is only as good as the accuracy of equipment, making calibration key for any NDT process. Ultrasonic testing calibration specifically centers on verifying measurement accuracy per standards set by ASTM International or another agency. Both vertical and horizontal measurements are taken in most cases using effective calibration tools within an instrument’s software platform and a reference block with known flaws. Reference blocks may also come from computer-simulated models.

Resolution of both the entry surface and far surface, noise sensitivity, and the accuracy of the calibrated gain control are also factors to consider when verifying equipment. When errors can’t be calibrated out, additional measures may be required, as this is indicative of a flaw in the equipment.

Processes for ultrasonic testing calibration can vary widely—as can the effectiveness of those strategies. When establishing a policy for managing these vital tests, it’s essential to review whether a third party or in-house testing is the most viable option both as far as resources and cost-effectiveness go.

Choosing Between In-House and Third-Party Testers

The choice between in-house or third-party ultrasonic testing calibration depends on the size and resources of the company. A smaller company with few employees may not have the expertise on staff to manage calibration. A larger firm, on the other hand, may find it more cost-effective to develop its own in-house team. Anyone considering these options should weigh the pros and cons.

Ultrasonic Testing: Calibration Standards and Options

One way to shore up pros and cons within both sides of the calibration decision is to consider leveraging both third-party companies with in-house employees. Having the third party manage the annual inspections and provide training to workers for spot checks helps with flexibility and cost-effectiveness when trying to keep ultrasonic NDT equipment performance high. 

Methods for ultrasonic testing calibration can vary widely based on the type of equipment and the analysts using it. One way to obtain consistent, high-quality results is to take advantage of a service contract that provides continuous third party maintenance and calibration of equipment. In some cases, these contracts can even offer provisions for training workers to manage their own calibrations. This is a worthwhile investment, as equipment calibration is a vital part of NDT testing.

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