Foreword

Introduction

1Scope

2Normative references

3Terms and definitions

4Symbols

5Inspection and testing

6Materials

6.1General requirements

6.2Controls on chemical composition

6.3Heat treatment

6.4Failure to meet test requirements

7Design

7.1General requirements

7.2Limitation on tensile strength

7.3Design of cylindrical shell thickness

7.4Design of convex ends (heads and bases)

7.5Design of concave base ends

7.6Neck design

7.7Foot rings

7.8Neck rings

7.9Design drawing

8Construction and workmanship

8.1General

8.2Wall thickness

8.3Surface imperfections

8.4Ultrasonic examination

8.5Out-of-roundness

8.6Mean diameter

8.7Straightness

8.8Verticality and stability

8.9Neck threads

9Type approval procedure

9.1General requirements

9.2Prototype tests

9.2.1General requirements

9.2.2Verification of hardness/tensile correlation

9.2.3Pressure cycling test

9.2.4Flawed cylinder burst test

9.2.4.1General

9.2.4.2Details of flaw

9.2.4.3Test procedure

9.2.4.4Acceptance criteria for the flawed cylinder burst test

9.2.5Flawed cylinder cycle test

9.2.5.1Test conditions

9.2.5.2Details of flaw

9.2.5.3Acceptance criteria for the flawed cylinder cycle test

9.2.6Base check

9.2.7Bend test and flattening test

9.2.7.1Bend test

9.2.7.2Flattening test

9.2.7.3Ring flattening test

9.2.8Torque test for taper thread only

9.2.8.1Procedure

9.2.8.2Acceptance criteria

9.2.9Shear stress calculation for parallel threads

9.2.9.1Procedure

9.2.9.2Acceptance criteria

9.3Type approval certificate

10Batch tests

10.1General requirements

10.2Tensile test

10.3Impact test

10.4Hydraulic bursting test

10.4.1Test installation

10.4.2Test conditions

10.4.3Interpretation of test results

11Tests/examinations on every cylinder

11.1General

11.2Hydraulic test

11.2.1Proof pressure test

11.2.2Volumetric expansion test

11.3Hardness test

11.4Leak test

11.5Capacity check

12Certification

13Marking

Annex ADescription and evaluation of manufacturing imperfections in seamless gas cylinders (normative)

A.1Overview

A.2General

A.3Manufacturing imperfections and the procedure for their evaluation

A.4Acceptance and rejection conditions

Annex BUltrasonic examination (normative)

B.1General

B.2General requirements

B.3Flaw detection of the cylindrical parts

B.3.1Procedure

B.3.2Reference standard

B.3.3Calibration of equipment

B.4Wall thickness measurement

B.5Interpretation of results

B.6Certification

Annex CExample of type approval certificate (informative)

Annex DExample of acceptance certificate (informative)

Annex EBend stress calculation (informative)

Annex FAn example of shear strength calculation for parallel threads (informative)

Bibliography