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BS 6657:2002

BS 6657:2002

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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Assessment of inadvertent initiation of bridge wire electro-explosive devices by radio-frequency radiation. Guide

Available format(s)

Hardcopy , PDF

Superseded date

10-03-2005

Language(s)

English

Published date

30-06-2003

Publisher

British Standards Institution

Committees responsible
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 General considerations
6 Transmitter and transmitter output parameters
7 Circuits for blasting and well perforation
8 Electro-explosives devices
9 Methods of assessment for determining potential RF ignition
   hazards on site where EED are used
10 Practical on-site testing
11 Safety procedures
12 Special applications
Annex A (informative) Extraction of energy from the electromagnetic
        field
Annex B (informative) Measurement of electromagnetic fields
Annex C (informative) Sources of information and addresses of
        advisory bodies
Annex D (informative) Electromagnetic radiated fields and examples
        of radiating antennas and unintended receiving antennas
        characteristics
Annex E (informative) The effective resistance of the leading wires
        of EED
Annex F (informative) Derivation of minimum distances of safe
        approach for Table 2 and Table 3
Annex G (informative) Ground-wave propagation (vertical
        polarization) - Calculation of field strength
Annex H (informative) Worked examples to demonstrate the effects of
        antenna gain
Annex I (informative) The effects of leading wire resistance,
        safety resistors and the use of EED with different
        characteristics
Annex J (informative) Derivation of Figure 12a) to Figure 12g) for
        EED alone incorporating the resistance of leading wire and
        safety resistances
Bibliography

Presents guidance on assessing the potential ignition hazard from the inadvertent extraction of energy from electromagnetic fields, propagated from radio frequency (RF), radar or other transmitter antennas and the coupling of this energy to an electro-explosive device (EED) in a manner capable of causing initiation.

Committee
EXL/31
DevelopmentNote
Supersedes BS 6657(1991) and 97/261809 DC. (12/2002) Superseded by BS PD CLC/TR 50426 but remains current. (04/2006)
DocumentType
Standard
Pages
94
PublisherName
British Standards Institution
Status
Superseded
SupersededBy

This British Standard provides guidance on assessing the possibility of inadvertent extraction of energy from an electromagnetic field propagated from radio frequency (RF), radar or other transmitter antennas and the coupling of this energy to an electro-explosive device (EED) in a manner capable of causing initiation. The frequency range covered by this British Standard is 9kHz to 60GHz. This British Standard only applies to bridge-wire devices which are directly initiated by radio frequency current and does not apply to special detonators, for example, electronic detonators. It does not cover the similar hazard arising from electromagnetic fields generated by other means, for example electric storms, electricity generating plant or power transmission lines.

This British Standard does not apply to the following equipment:

  • air bag igniters for automotive applications (including the igniters before they are fitted);

  • special pyrotechnic devices;

  • pyromechanisms;

  • igniters for fireworks;

  • special military devices;

  • special safety equipment.

NOTE The methods of assessment from 9GHz to 60GHz are based on extrapolation of data for frequencies below 9GHz.

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Hardcopy - English
PDF - English
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