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CGA C 20:2005

CGA C 20:2005 Methods For Ultrasonic Examination Of Metallic, Dot And Tc 3-series Gas Cylinders And Tubes Specifies the acceptable ultrasonic examination methods that can be used in place of internal visual inspection and hydrostatic requalification for the examination of certain metallic, 3-series, gas c

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Table of Contents

1Introduction
2Scope
3Definitions
4Operationaldescription
4.1Objective
4.2Ultrasonicexaminationequipment
4.3Monitoringofacousticcoupling
4.4Flawdetection
4.5Maximumflawlimits
5Equipmentandmaterial
5.1Powersupply
5.2Transducer
5.3Pulser/receiver
5.4Displaydevice
5.5Coaxialcable
5.6Oscilloscopedisplaycontrols
5.7Datastorage
5.8C-scan
6Calibration
6.1Cylindercalibrationprocedure
6.2Gaincontrolaccuracy
6.3Calibrationcylinderrequirements
6.4Referencefeaturesinthecalibrationcylinder
(standardreference)
6.5Verificationofequipmentcalibration
7Cylinderandtubeexaminationprocedures
8Documentation
8.1Report
8.2Recordrequirements
8.3Recordsmaintenance
9Rejectioncriteria
10Operatorqualifications
11References
12Additionalreferences
Appendices
AppendixA-DOTexemptions/specialpermitsandTCpermits
forequivalentlevelofsafety(Informative)
AppendixB-Typesofflaws(Informative)
AppendixC-Calibrationstandardsforchangesinnominal
diameterordesignminimumwallthicknessof
acylinder(Normative)

Abstract

Specifies the acceptable ultrasonic examination methods that can be used in place of internal visual inspection and hydrostatic requalification for the examination of certain metallic, 3-series, gas cylinders and tubes as mandated by Title 49 of the U.S. Code of Federal Regulations and Transportation of Dangerous Goods Regulations of Transport Canada.

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