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Significance and Use
The AE examination method detects damage in FRP equipment. The damage mechanisms that are detected in FRP are as follows: resin cracking, fiber debonding, fiber pullout, fiber breakage, delamination, and bond failure in assembled joints (for example, nozzles, manways, etc.). Flaws in unstressed areas and flaws that are structurally insignificant will not generate AE.
This practice is convenient for on-line use under operating stress to determine structural integrity of in-service equipment usually with minimal process disruption.
Indications located with AE should be examined by other techniques; for example, visual, ultrasound, dye penetrant, etc., and may be repaired and tested as appropriate. Repair procedure recommendations are outside the scope of this practice.
1.1 This practice covers acoustic emission (AE) examination or monitoring of fiberglass-reinforced plastic (FRP) tanks-vessels (equipment) under pressure or vacuum to determine structural integrity.
1.2 This practice is limited to tanks-vessels designed to operate at an internal pressure no greater than 1.73 MPa absolute [250 psia] above the static pressure due to the internal contents. It is also applicable for tanks-vessels designed for vacuum service with differential pressure levels between 0 and 0.10 MPa [0 and 14.5 psi].
1.3 This practice is limited to tanks-vessels with glass contents greater than 15 % by weight.
1.4 This practice applies to examinations of new and in-service equipment.
1.5 Units—The values stated in either SI units or inch-pound units are to be regarded as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.6 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 and health practices and determine the applicability of regulatory limitations prior to use. (For more specific safety precautionary information see 8.1.)
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D883 Terminology Relating to Plastics
D5436 Specification for Cast Poly(Methyl Methacrylate) Plastic Rods, Tubes, and Shapes
E543 Specification for Agencies Performing Nondestructive Testing
E650 Guide for Mounting Piezoelectric Acoustic Emission Sensors
E750 Practice for Characterizing Acoustic Emission Instrumentation
E1316 Terminology for Nondestructive Examinations
E2075 Practice for Verifying the Consistency of AE-Sensor Response Using an Acrylic Rod
E2374 Guide for Acoustic Emission System Performance Verification
ANSI/ASNT StandardsANSI/ASNTCP-189 Standard for Qualification and Certification of Nondestructive Testing Personnel
AIA StandardNAS-410 Certification and Qualification of Nondestructive Personnel (Quality Assurance Committee) Available from Aerospace Industries Association of America, Inc. (AIA), 1000 Wilson Blvd., Suite 1700, Arlington, VA 22209-3928, http://www.aia-aerospace.org.
ICS Number Code 17.140.20 (Noise emitted by machines and equipment); 23.020.10 (Stationary containers and tanks)