I.P-2 MODIFIED ULTRASONIC REQ.pdf

This document is a technical modification to ultrasonic test requirements for laminar discontinuities in tubes, referencing MIL-T-16420K military specification standards.

The modification consists of three specific changes: First, paragraph 3.4.3.4 of MIL-T-16420K is deleted and replaced with revised requirements for examining tubes with laminar discontinuities using ultrasonic gaging. The new language establishes rejection criteria for tubes containing laminar discontinuities that exceed exploration threshold levels, with specific decibel thresholds varying by test method—20 percent for the contact method at +6dB and 30 percent for the immersion method at calibration. Second, in paragraph 4.4.7, the measurement specification is changed from "18-inch" to "1-inch." Third, the final sentence of paragraph 4.4.7 is modified to insert reference to section "3.4.3.4. AND" before the rejection criteria in section "3.8.2."