ASTM E2491 PDF

Link to Active This link will always route to the current Active version of the standard. Active view current version of standard. Historical Version s — view previous versions of standard. Other electronic instrument characteristics in phased-array units are similar to non-phased-array units and may be measured as described in Practice E or Guide E This guide is not intended to be used as a substitute for calibration or standardization of an instrument or system to inspect any given material. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Instrument characteristics measured in accordance with this guide are expressed in terms that relate to their potential usefulness for ultrasonic examinations.

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More E Scope 1. An angle beam lateral longitudinal LCR wave is excited with wedges along a circumferential chord of the tank wall. A digital ultrasonic flaw detector is used with sending-receiving search units in through transmission mode.

The observed velocity is temperature corrected and compared to the expected velocity for a new, unexposed sample of material which is the same as the material being evaluated. The difference between the observed and temperature corrected velocities determines the degree of UV exposure of the tank. Degradation typically occurs in an outer layer approximately 3.

Since the technique does not interrogate the inside wall of the tank, wall thickness is not a consideration other than to be aware of possible guided Lamb wave effects or reflections off of the inner tank wall. No special surface preparation is necessary beyond wiping the area with a clean rag. Inside wall properties are not important since the longitudinal wave does not strike this surface. The excitation of Lamb waves must be avoided by choosing an excitation frequency such that the ratio of wavelength to wall thickness is one fifth or less.

The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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ASTM E2491 PA Assessment Block (a.k.a. Type B), Type 304 Stainless Steel

More E Scope 1. An angle beam lateral longitudinal LCR wave is excited with wedges along a circumferential chord of the tank wall. A digital ultrasonic flaw detector is used with sending-receiving search units in through transmission mode.

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ASTM E2491 PA Assessment Block (a.k.a. Type B), 1018 Steel

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