BS EN IEC 61340-4-4:2018 – TC:2020 Edition
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Tracked Changes. Electrostatics – Standard test methods for specific applications. Electrostatic classification of flexible intermediate bulk containers (FIBC)
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 117 |
IEC 61340-4-4:2018 is also available as /2 which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition. IEC 61340-4-4:2018 specifies requirements for flexible intermediate bulk containers (FIBC) between 0,25 m3 and 3 m3 in volume, intended for use in hazardous explosive atmospheres. The explosive atmosphere can be created by the contents in the FIBC or can exist outside the FIBC. The requirements include: – classification and labelling of FIBC; – classification of inner liners; – specification of test methods for each type of FIBC, inner liner, labels and document pockets; – design and performance requirements for FIBC, inner liners, labels and document pockets; – safe use of FIBC (including those with inner liners) within different zones defined for explosion endangered environments, described for areas where combustible dusts are, or can be, present (IEC 60079-10-2), and for explosive gas atmospheres (IEC 60079-10-1); – procedures for type qualification and certification of FIBC, including the safe use of inner liners. This third edition cancels and replaces the second edition, published in 2012, and Amendment 1:2014. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) in light of experimental evidence, the maximum resistance to ground limit for Type C FIBC, and corresponding resistance limits for inner liners used in Type C FIBC has been increased from 10 M ohms to 100 M ohms; b) the classification of Type L1 inner liners has been revised and extended to include Type L1C inner liners made from multi-layer materials with a conductive internal layer; c) a labelling requirement to include a reference to IEC TS 60079-32-1 for guidance on earthing has been added.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 64 | undefined |
| 69 | English CONTENTS |
| 72 | FOREWORD |
| 74 | INTRODUCTION |
| 75 | 1 Scope |
| 76 | 2 Normative references |
| 77 | 3 Terms and definitions |
| 79 | 4 Classification 4.1 Classification for FIBC 4.1.1 Principles of classification 4.1.2 Type A 4.1.3 Type B 4.1.4 Type C 4.1.5 Type D 4.2 Principles of classification and requirements for inner liners 4.2.1 Components of inner liners |
| 80 | 4.2.2 Surface resistivity measurements for inner liners 4.2.3 Breakdown voltage measurements for inner liners Figures Figure 1 – Examples of inner liners in FIBC |
| 81 | 4.2.4 Type L1 Tables Table 1 – Permissible configurations and requirements for Type L1 inner liners(without conductive internal layers) |
| 82 | 4.2.5 Type L1C 4.2.6 Type L2 Table 2 – Permissible configurations and requirements for Type L1C inner liners (with conductive internal layersa) |
| 83 | 4.2.7 Type L3 Table 3 – Permissible configurations and requirements for Type L2 inner liners |
| 84 | 4.3 Combination of FIBC and inner liners 5 Safe use of FIBC Table 4 – Permissible configurations and requirements for Type L3 inner liners Table 5 – Use of different types of FIBC |
| 85 | Table 6 – Inner liners and FIBC: combinations that are permissible and not permissible in hazardous explosive atmospheres |
| 86 | 6 Labelling |
| 87 | Figure 2 – Example of a label for Type B FIBC Figure 3 – Example of a label for Type C FIBC |
| 88 | Figure 4 – Example of a label for Type D FIBC Figure 5 – Example of labels for Type C FIBC designated earth bonding points |
| 89 | 7 Requirements for FIBC 7.1 General remarks 7.2 Requirements for dust environments with ignition energies greater than 3 mJ (apply to Type B FIBC, Type C FIBC and Type D FIBC) |
| 90 | 7.3 Requirements for vapour and gas atmospheres and for dust environments with ignition energies of 3 mJ or less 7.3.1 Type C FIBC 7.3.2 Type D FIBC |
| 91 | 8 Atmosphere for conditioning, calibrating and testing 8.1 Conditioning time 8.2 Electrical breakdown voltage, surface resistivity and resistance to groundable point testing 8.3 Surface resistivity testing 8.4 Ignition testing 9 Test procedures 9.1 Sampling 9.2 Electrical breakdown voltage |
| 92 | 9.3 Ignition testing 9.3.1 Apparatus |
| 93 | Figure 6 – Ignition probe |
| 94 | Figure 7 – Perforated metal plate for use in ignition probe Table 7 – Volume concentrations of flammable gas mixture |
| 95 | Figure 8 – Gas control and mixing apparatus (schematic) |
| 97 | Figure 9 – FIBC filling rig (schematic) |
| 98 | Figure 10 – Corona charging unit (schematic) |
| 99 | 9.3.2 Establishing correct charging current 9.3.3 Ignition tests |
| 102 | 9.4 Resistance to groundable point 9.4.1 Apparatus 9.4.2 Test procedure |
| 103 | 10 Test report 10.1 General |
| 104 | 10.2 For all types of testing 10.3 For electrical breakdown voltage testing 10.4 For ignition testing 10.5 For resistance to groundable point testing 10.6 For surface resistivity testing of inner liners, labels and document pockets 10.7 For test reports issued by accredited testing authorities |
| 105 | Table 8 – Example of full sample descriptionto be included in the test report |
| 106 | Annexes Annex A (informative) Electrical breakdown voltage – Typical voltage/time graphs Figure A.1 – Example of voltage/time graph for materialshowing distinct breakdown Figure A.2 – Example of voltage/time graph for material showing reduction in rate of voltage rise because of conduction within the test material |
| 107 | Annex B (normative) Polypropylene pellets for ignition testing Table B.1 – Particle size distributionof polypropylene pellets |
| 108 | Annex C (informative) Guidance on test methods for manufacturing quality control C.1 Introductory remarks C.2 Test methods C.2.1 Resistance measurements |
| 109 | C.2.2 Charge decay measurements C.2.3 Charge transfer measurements |
| 110 | Annex D (normative) Classification of hazardous areas and zones Table D.1 – Classification of hazardous areas in IEC 60079-10-1and IEC 60079-10-2 Table D.2 – Classification of zones in IEC 60079-10-1and IEC 60079-10-2 |
| 111 | Annex E (informative) Risks associated with cone discharges |
| 112 | Annex F (informative) Explanation for resistance and resistivity limits, and thickness limits for insulating layers of inner liners F.1 Resistance to groundable point limit for Type C FIBC F.2 Resistivity of inner liners F.3 Thickness of insulating layers of inner liners |
| 114 | Bibliography |
