BSI PD IEC/TS 60079-40:2015
$102.76
Explosive atmospheres – Requirements for process sealing between flammable process fluids and electrical systems
| Published By | Publication Date | Number of Pages |
| BSI | 2015 | 22 |
This document provides specific requirements for process sealing between a flammable process fluid and an electrical system where a failure could allow the migration of the process fluid directly into the premises wiring system.
Some definitions differentiate the terms “flammable” and “ combustible” liquids on the basis of their flashpoints. Combustible liquids under conditions of elevated pressure and/or temperature can lead to the formation of flammable mists and aerosols which are within the scope of this technical specification.
This document contains requirements for evaluation, construction and testing of single process seal equipment, dual process seal equipment, and add-on secondary process seals.
The requirements of this document do not apply to conduit sealing devices, cable glands and other wiring sealing methods addressed in the IEC 60079 series or other standards.
Requirements for basic electrical safety and explosion protection are not addressed by this document, but may apply to the equipment under investigation. The effects of leakage to the environment are not addressed by this document.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | CONTENTS |
| 5 | FOREWORD |
| 7 | 1 Scope 2 Normative references 3 Terms and definitions |
| 8 | Figures Figure 1 – Equipment process sealing components |
| 10 | 4 General requirements 4.1 Basis for requirements Figure 2 – Examples of add-on secondary process seals |
| 11 | 4.2 Single process seal equipment 4.3 Dual process seal equipment 4.4 Equipment with limited pressure at the electrical connections 4.5 Purged or pressurized equipment 4.6 Add-on secondary process seals |
| 12 | 4.7 Annunciators 5 Type verifications and tests 5.1 Test sample 5.2 Single process seal equipment 5.2.1 Order of conditioning 5.2.2 Temperature cycling |
| 13 | 5.2.3 Pressure cycling Figure 3 – Temperature cycle conditioning profile |
| 14 | 5.2.4 Leakage test 5.2.5 Burst pressure test 5.3 Dual process seal equipment 5.3.1 Primary process seal leakage test 5.3.2 Primary process seal burst pressure test 5.3.3 Venting pressure determination Tables Table 1 – Leakage test pressures Table 2 – Burst test pressures |
| 15 | 5.3.4 Verification of annunciation effectiveness 5.3.5 Secondary process seal leakage test 5.4 Verification of limited pressure effectiveness 6 Marking 7 Instructions |
| 17 | Annex A (informative)Conditioning and test flowchart |
| 18 | Figure A.1 – Conditioning and test flowchart |
| 19 | Bibliography |
