This technical information has been contributed by
Laboratory Testing Inc.

LTI Announces Immersion Ultrasonic Testing for Materials to 5000 lbs.

Non-Destructive Testing

HATFIELD, Pa.--Laboratory Testing Inc. (LTI) recently expanded its immersion ultrasonic testing (UT) capabilities with the installation of a 24-foot by 5-foot immersion tank. A two-axis, five-channel A, B, and C scan immersion ultrasound system was installed to perform testing of round material up to 20 feet long and 24 inches in diameter and flat material up to 20 feet long and 4 feet wide, with a weight limit of 5000 pounds. The new immersion tank is equipped with a computer-based recording system, which generates detailed printouts of test data and results, an option not available with contact ultrasonic testing.

Prior to the installation, Laboratory Testing already had extensive capabilities for immersion UT inspection with three high-speed immersion machines for round stock between 1/8 inch and 6 5/8 inches diameter, and lengths up to 75 feet. The contact inspection method was used for ultrasonic testing of material outside these size and shape limitations. The new immersion capabilities are said to provide a speed and reliability advantage over the contact method, as well as chart recording and printouts not available with contact ultrasonic testing.

"This new system greatly expands the scope of LTI's immersion capabilities, provides faster turnaround for large volume, repetitive orders, and adds a control factor for higher accuracy that is not available with the contact method of inspection," according to Phil Trach, NDT technology coordinator and ASNT NDT Level III. "Our long-term experience with immersion ultrasound and with inspection of large-diameter and very heavy pieces makes this a natural extension of ultrasonic capabilities for Laboratory Testing Inc."

Ultrasonic Testing (UT) is an inspection method used to find internal and external defects or to measure wall thickness discontinuities in materials and parts. The process is nondestructive, which means the test item is not damaged during testing. An ultrasound probe connected to a diagnostic machine passes over the item being inspected and transmits high-frequency sound waves into the item. A defect or inconsistency will cause some of the energy to be reflected. This reflected signal can be processed to give useful information about the condition that caused the reflection.

Ultrasonic testing can be performed either by the immersion or contact methods. Immersion inspections take place in a liquid, which conducts the beam of sound between the probe and test material. With the contact method, an ultrasonic probe emitting sound waves is run over the surface of the test piece.

Information on Laboratory Testing services and accreditations is available at or 800-219-9095.

This technical information has been contributed by
Laboratory Testing Inc.

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