1.1''This practice2 covers ultrasonic examination of materials using the conventional pulse-echo method using straight-beam longitudinal waves introduced by direct contact of the search unit with the material being examined.

1.2''This practice shall be applicable to development of an examination procedure agreed upon by the users of the document.

1.3''Units'''The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4''This standard does not purport to address all of the safety concerns, if any, associated with its use. 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.

1.5''This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.