ISO/TS 19016:2019

TECHNICAL ISO/TS
SPECIFICATION 19016
First edition
2019-10
Gas cylinders — Cylinders and tubes
of composite construction — Modal
acoustic emission (MAE) testing for
periodic inspection and testing
Bouteilles à gaz — Bouteilles et tubes composites — Essai par
émission acoustique modale (EAM) pour les besoins du contrôle et des
essais périodiques
Reference number
©
ISO 2019
© ISO 2019
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Published in Switzerland
ii © ISO 2019 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
3.1 Terms and definitions . 1
3.2 Symbols . 5
4 Modal acoustic emission (MAE) general operational principles .6
5 Personnel qualification . 6
6 Test validity . 6
7 Calibration . 6
7.1 Absolute sensor calibration . 6
7.2 Rolling ball impact calibration . 7
7.2.1 General. 7
7.2.2 Direct calibration . 8
7.2.3 Linearity calibration . 8
7.3 MAE wave recording system calibration . 8
8 MAE testing equipment . 9
9 MAE testing . 9
9.1 General . 9
9.2 MAE testing procedure . 9
9.2.1 General. 9
9.2.2 Sensor coupling . . .10
9.2.3 Sensor positioning .10
9.2.4 Attenuation measurement . .11
9.2.5 System settings .11
9.2.6 System sampling rate .11
9.2.7 Sensor coupling checks .11
9.2.8 Pressurisation test methods .11
9.2.9 Repeating MAE testing . .12
10 Interpretation .13
10.1 General .13
10.2 Noise filtering .13
10.2.1 General.13
10.2.2 Electromagnetic interference (EMI) .14
10.2.3 Mechanical rubbing .14
10.2.4 Flow noise .14
10.2.5 Leakage .14
10.2.6 Clean front end .14
10.3 Data analysis .14
11 Evaluation and rejection criteria.14
11.1 Evaluation .14
11.2 Analysis procedure .15
11.2.1 General.15
11.2.2 Rejection due to partial fibre bundle rupture criteria .15
11.2.3 Rejection due to single event energy .15
11.2.4 Rejection due to background energy (BE) and background energy
oscillation (BEO) .15
12 Test report .16
13 Rejection and rendering cylinders unserviceable .16
Annex A (normative) MAE testing equipment specification .17
Annex B (informative) Overview of modal acoustic emission (MAE) test method .19
Bibliography .24
iv © ISO 2019 – All rights reserved

Foreword
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This document was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 4,
Operational requirements for gas cylinders.
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Introduction
In recent years, new non-destructive examination (NDE) techniques have been successfully introduced
as an alternative to the conventional retesting procedures of gas cylinders, tubes and other cylinders.
One of the alternative NDE methods for certain applications is acoustic emission testing (AT), which in
several countries has proved to be an acceptable testing method applied during periodic inspection.
This AT method is described in ISO 16148, which authorizes pressurization pneumatically to a value
equal to 110 % of the cylinder’s working pressure and hydraulic pressurization to a value equal to the
cylinder’s test pressure. Since ISO 16148 was developed for periodic inspection and testing of monolithic
materials (seamless steel and aluminium-alloy cylinders), the test method was not appropriate for
composite cylinders. The modal acoustic emission (MAE) test method described in this document was
developed to address this shortcoming.
The MAE test method described in this document applies during periodic inspection and testing, and
it uses either hydraulic (liquid) pres
...