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General Explosive Atmosphere Standards

General explosive atmosphere standards address the basic concepts and methodologies for explosion prevention and protection. Including standardized vocabularies and glossaries of relevant terms, these standards provide uniformity between different industries and organizations. Additionally, given their wide applicability, gas detection instruments have their recommended practices and performance requirements outlined, and the methodology for the functional safety assessment of protective systems is provided as well.

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ANSI/ISA 12.04.04-2012

Pressurized Enclosures

This standard applies to equipment made suitable for use in hazardous (classified) locations by pressurizing the use of a pressurizing system. This standard applies both to equipment with and without an internal release of a flammable gas or vapor. This standard does not apply to occupied portions of buildings such as ventilated or pressurized control rooms.


ANSI/ISA 12.13.04-2007 (R2014)

Performance Requirements for Open Path Combustible Gas Detectors

This standard provides minimum requirements for fixed and transportable open path gas detection apparatus. This standard specifies the construction, performance and testing of open path (line-of-sight) gas monitors that sense the presence of combustible gas or vapor concentrations in air.


IEC 60050-426 Ed. 2.0 b:2008

International Electrotechnical Vocabulary - Part 426: Equipment for explosive atmospheres

This second edition cancels and replaces the first edition published in 1990. This edition constitutes a technical revision. This edition included the following significant technical changes with respect to the previous edition: Terms and definitions have been revised to align with those used in the documents listed in the normative references


ANSI/ISA 12.13.01-2013

Explosive Atmospheres - Part 29-1: Gas detectors - Performance requirements of detectors for flammable gases

This part of ANSI/ISA-60079-29 specifies general requirements for construction, testing and performance, and describes the test methods that apply to portable, transportable and fixed apparatus for the detection and measurement of flammable gas or vapour concentrations with air. The apparatus, or parts thereof, are intended for use in explosive gas atmospheres (see 3.1.3) and in mines susceptible to firedamp.


ANSI/ISA 12.13.02-2012

Explosive Atmospheres - Part 29-2: Gas detectors - Selection, installation, use and maintenance of detectors for flammable gases and oxygen

This part of ISA-60079-29 gives guidance on, and recommended practice for, the selection, installation, use and maintenance of electrically operated group II apparatus intended for use in industrial and commercial safety applications for the detection and measurement of flammable gases complying with the requirements of ISA-60079-29-1 and ANSI/ISA-12.13.04.




BS EN 1127-2:2014

Explosive atmospheres. Explosion prevention and protection. Basic concepts and methodology for mining (British Standard)

This European Standard specifies methods gives general guidelines for explosion prevention and protection in mining by outlining the basic concepts and methodology for the design and construction of equipment, protective systems and components.This European Standard applies to Group I equipment, protective systems and components intended for use in underground parts of mines and those parts of their surface installations at risk from firedamp and/or flammable dust.NOTE 1 Detailed information on specific equipment, protective systems and components is contained in the relevant individual standards. Safety-relevant data regarding flammable materials and explosive atmospheres are required for the design and construction of the explosion protection measuresThis European Standard specifies methods for the identification and assessment of hazardous situations that may lead to explosions and describes the design and construction measures appropriate for the required safety. This is achieved by hazard identification;- risk assessment;- elimination or minimization of risk reduction.; information for use.The safety of equipment, protective systems, and components can be achieved, as described in EN 292-2:1991, by removal of eliminating hazards and/or limiting the risk, i.e.a) by risk reduction by designappropriate design (without using safeguarding);b) by safeguarding;c) by information for use;d) by additional precautionsany other preventive measures.NOTE Risk reduction by design in accordance with clause 3 of EN 292-2:1991 should not be confused with the concept of "design" as described in 6.5 of this standard.Measures in accordance with a) (prevention) and b) (protection) against explosions are dealt with in clause 6 of this standard, measures according to c) against explosions are dealt with in clause 7 of this standard. Measures in accordance with d) are not described in this European Standard. They are dealt with in clause 6 of EN 292 2:1991ISO 12100:2010, clause 6.The preventive and protective measures described in this European Standard will not provide the required level of safety unless the equipment, protective systems and components are operated in line with their intended use and are installed and maintained according to the relevant codes of practice or requirements.This standard is applicable to any equipment, protective systems and components intended to be used in potentially explosive atmospheres. These atmospheres can arise from flammable materials processed, used or released by the equipment, protective systems and components or from materials in the vicinity of the equipment, protective systems and components and/or from the materials of construction of the equipment, protective systems and components.As shot firing can release potentially explosive atmospheres, this standard is also applicable to the equipment used for shot firing, apart from the explosives and detonators.This standard is applicable to equipment, protective systems and components at all stages of use.This standard is not applicable to:- medical devices intended for use in a medical environment;- equipment, protective systems and components where the explosion hazard results exclusively from the presence of explosives or unstable chemical substances;- equipment, protective systems and components where the explosion can result from reaction of substances with oxidizing agents other than atmospheric oxygen or by other hazardous reactions or conditions other than atmospheric conditions;- equipment intended for use in domestic and non-commercial environments where explosive atmospheres may only rarely be created and solely as a result of the accidental leakage of fuel gas; personal protective equipment within the meaning ofcovered by Directive 89/686/EEC;- the design and construction of systems containing desired, controlled combustion processes, unless they can act as ignition sources in potentially e


BS EN 13237:2012

Potentially explosive atmospheres. Terms and definitions for equipment and protective systems intended for use in potentially explosive atmospheres (British Standard)

This European Standard specifies terms and definitions (vocabulary) to be used in suitable standards dealing with equipment and protective systems intended for use in potentially explosive atmospheres.OTEirective 94/9/EC concerning equipment and protective systems intended for use in potentially explosive atmospheres can be applicable to the type of machine or equipment covered by this European Standard. The present standard is not intended to provide means of complying with the essential health and safety requirements of Directive 94/9/EC.


BS EN 13821:2002

Potentially explosive atmospheres. Explosion prevention and protection. Determination of minimum ignition energy of dust/air mixtures (British Standard)

This EN specifies a method of test to determine the minimum ignition energy of a dust/air mixture by an electrically generated spark. It is intended that the dust be tested in a form representing conditions of actual use so that assessment of the hazard present can be made. Ignition energies determined by this method would be compared with ignition by a pointed source. This EN is applicable to the determination of the minimum ignition energy of a combustible dust dispersed in air, referred to hereafter as a "dust/air mixture".


BS EN 15233:2007

Methodology for functional safety assessment of protective systems for potentially explosive atmospheres (British Standard)

This European Standard provides guidance on the procedure and information required to allow functional safety assessment to be carried out for the design of protective systems. The purpose of this European Standard is to assist technical standardization committees responsible for specific families of protective systems in preparing safety standards. Such standards shall be as homogenous as possible and shall have the basic structure of functional safety assessment as it is stated in this standard. If there are no specific standards for a particular protective system, the manufacturer shall use this standard for functional safety assessment of this protective system. In this procedure the following information is to be taken into account to ensure a sufficient level of functional safety: a) intended use, b) possible operating faults, c) reliability of protective systems, d) misuse which can reasonably be anticipated. A sufficient level of functional safety is characterized by the following objectives: 1) System can stop an explosion at a very early stage or reduce the impact of an explosion to an acceptable level. 2) In the event of faults, failures and/or interference ) the capacity to function remains effective by use e.g. of fail safe techniques or redundancy. This European Standard does not cover identification of possible ignition sources. NOTE 1 The identification of possible ignition sources is covered by EN 15198. This European Standard only deals with the functional behaviour of the protective system i.e. hazards caused by malfunctions, e.g. false activations are excluded. This European Standard specifies neither specific methods to analyse fault conditions, nor specific requirements for a given type of protective system (see EN 1127 1). It specifies the methodology of functional safety assessment. (continued)


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