INTERNATIONAL STANDARD
ofpositeconstruction-Acoustic Gascylinders-Cylindersandtubes periodicinspectionandtesting emissionexamination(AT)for
emission acoustique (EA) pour les controles et les essais periodiques Bouteilles gazBouteilles et tubes positesEssai par
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Contents
Page
Foreword. ivIntroduction. ..V1 Scope. .12 Normative references. 13 Terms and definitions. 14 General operational principles of acoustic emission. 35 Personnel qualification. Test validity (input instructions). 46 Acoustic emission testing calibration and testing equipment. 47 7.1 Acoustic emission equipment and settings. 4 47.1.1 7.1.2 Sensors. Acoustic emission instrumentation. 47.1.3 7.1.4 Preamplifiers. Filter.7.1.5 Settings. 5 47.2 7.2.1 Acoustic emission examination calibration and equipment verification. Calibration. 5 57.2.3 7.2.2 Procedure. Determination and check of sensor installation layout. .57.2.4 Pressurization test methods. .8 67.2.5 Analysis of AE criteria. 68 Test report. Verification of rejection criteria using actual cylinders. 99 10 Rejection and rendering cylinders unserviceable. 10 9Annex A (informative) Example of verification tests performed on cylinders to detectdamage resulting from mechanical impacts or other types of damage 11Annex B (informative) Examples of rejection criteria 14Bibliography 15
Foreword
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This document was prepared by Technical Committee ISO/TC 58 Gas cylinders Submittee SC 4 Operational requirements for gas cylinders.
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Introduction
In recent years new non-destructive examination (NDE) techniques have been successfully introducedas an alternative for part of the conventional testing procedures for gas cylinders and tubes at the timeof periodic inspection and testing.
One of the NDE alternative methods for certain applications is acoustic emission examination (AT) which in several countries has proven to be an acceptable testing method applied during periodicinspection.
This AT method for Type 1 cylinders is described in ISO 16148 which allows pneumatic pressurizationa value equal to the cylinder's test pressure. ISO 16148 was developed for periodic inspection andtesting of monolithic materials (seamless steel and aluminium-alloy cylinders [Type 1]) and includes modal acoustic emission. ISO 16148 is not adapted to test posite cylinders. For posite cylinders further details on the use of modal acoustic emission are described in ISO/TS 19016.
ISO 11623 provides requirements for the periodic inspection of posite cylinders based on thehydraulic test and visual inspection.
AT was used recently (HyPactor Projectll1) to detect loss of performance of posite cylinders due to mechanical impact. These tests have shown that this method can be used successfully to detect defectsin posite cylinders provided that appropriate verification criteria using performance tests and pressurization tests for cylinders and tubes with or without damage are used as outlined in Annex A.
This document also gives other requirements concerning preparation finishing and maintenance ofposite cylinders and tubes as well as the safety precautions for the personnel performing this work.These requirements can be mandatory under other regulations.
