prEN ISO/IEC 80079-41

Explosive atmospheres - Part 41: Reciprocating internal combustion engines (ISO/IEC DIS 80079-41:2023)

This part of ISO/IEC 80079 covers the technical requirements necessary to avoid or minimize the significant hazards listed in Clause 4, which could occur during normal operation, maintenance or foreseeable malfunction of reciprocating internal combustion engines intended for use in explosive atmospheres including
- Group I EPL Mb for use in underground workings susceptible to firedamp and/or combustible dust,
- Group II EPL Gb and Gc for use in potentially explosive atmospheres of flammable gas and vapour and
- Group III EPL Db and Dc for use in potentially explosive atmospheres of combustible dust.
This part of ISO/IEC 80079 includes those tests of the engine and its ancillary devices that are required to verify compliance.
This part of ISO/IEC 80079 applies to reciprocating internal combustion engines with compression ignition and spark ignition.
This part of ISO/IEC 80079 does not define requirements relating to the driven machinery and equipment.
This part of ISO/IEC 80079 does not apply
- to flammable gas and vapour atmospheres containing carbon disulphide (CS2) and/or ethylene oxide (C2H4O) due to special properties of these gases;
- to explosive mixtures of vapours and gases, which tend to self-decompose (e.g. acetylene) or which are chemically unstable.This International standard does not apply to engines used in areas for the processing manufacture or storage of explosives;
- to gasoline engines and all other liquid injection spark ignited engines.
This part of ISO/IEC 80079 solely deals with explosion protection requirements. Requirements on emissions are not covered by this standard.
General safety requirements are not included in this International Standard.
NOTE 1   General safety requirements i.e. those common to internal combustion engines, are covered for the EU in EN 1679-1:1998+A1:2011.
This part of ISO/IEC 80079 does not specify requirements for safety, other than those directly related to the risk of ignition which may then lead to an explosion.The standard atmospheric conditions (relating to the explosion characteristics of the atmosphere) under which it may be assumed that engine can be operated are:
- temperature -20 °C to +40 °C;
- pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar); and
- air with normal oxygen content, typically 21 % v/v.
Such atmospheres can also exist inside the engine. In addition, the external atmosphere can be drawn inside the engine by natural breathing produced as a result of fluctuations in the engine's internal operating pressure, and/or temperature.
NOTE 2   It is considered that −20 °C to +40 °C is appropriate for most engines. However for equipment designed for outside this range IEC/TS 60079-43 should be considered.
NOTE 3   The requirements of this standard can also be helpful for the design, construction, testing and marking of engine intended for use in atmospheres outside the validity range stated above. In this case however, the ignition hazard assessment, ignition protection provided, additional testing (if necessary), manufacturer’s technical documentation and instructions to the user, should clearly demonstrate and indicate the engine's suitability for the conditions it may encounter. It should also be recognized that changes in temperature and pressure can have a significant influence on characteristics of the explosive atmosphere, such as ignitability (see Annex I).
NOTE 4   Reciprocating internal combustion engines are not considered as pressure vessels.

Explosionsfähige Atmosphären - Teil 41: Hubkolben-Verbrennungsmotoren (ISO/IEC DIS 80079-41:2023)

Atmosphères explosives - Partie 41: Moteurs alternatifs à combustion interne (ISO/IEC DIS 80079-41:2023)

Eksplozivne atmosfere - 41. del: Batni motorji z notranjim zgorevanjem (ISO/IEC DIS 80079-41:2023)

General Information

• Status: Not Published
• Publication Date: 17-Nov-2024
• ICS: 13.230 - Explosion protection
• ICS: 27.020 - Internal combustion engines
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• Technical Committee: CEN/TC 305 - Potentially explosive atmospheres - Explosion prevention and protection
• Drafting Committee: CEN/TC 305/WG 5 - Equipment and protection systems for mining
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Directive: 2014/34/EU - Directive 2014/34/EU Of The European Parliament And Of The Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to equipment and protective systems intended for use in potentially explosive atmospheres (recast)
• Mandate: M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Mandate: M/596 - [C(2023)4798] Commission Implementing Decision of 20.7.2023 on a standardisation request as regards equipment and protective systems intended for use in potentially explosive atmospheres in support of Directive 2014/34/EU (ATEX) of the European Parliament and of the Council
• Mandate: M/BC/CEN/92/46 - Standardization mandate assigned to CEN/CENELEC concerning equipment and protective systems intended for use in potentially explosive atmospheres
• Ref Project: oSIST prEN ISO/IEC 80079-41:2023 - Explosive atmospheres - Part 41: Reciprocating internal combustion engines (ISO/IEC DIS 80079-41:2023)

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2023
Eksplozivne atmosfere - 41. del: Batni motorji z notranjim zgorevanjem (ISO/IEC
DIS 80079-41:2023)
Explosive atmospheres - Part 41: Reciprocating internal combustion engines (ISO/IEC
DIS 80079-41:2023)
Explosionsfähige Atmosphären - Teil 41: Hubkolben-Verbrennungsmotoren (ISO/IEC
DIS 80079-41:2023)
Atmosphères explosives - Partie 41: Moteurs alternatifs à combustion interne (ISO/IEC
DIS 80079-41:2023)
Ta slovenski standard je istoveten z: prEN ISO/IEC 80079-41
ICS:
13.230 Varstvo pred eksplozijo Explosion protection
27.020 Motorji z notranjim Internal combustion engines
zgorevanjem
29.260.20 Električni aparati za Electrical apparatus for
eksplozivna ozračja explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT INTERNATIONAL STANDARD
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Voting begins on: Voting terminates on:
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Explosive atmospheres —
Part 41:
Reciprocating internal combustion engines
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ISO/IEC DIS 80079-41:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/IEC DIS 80079-41
ISO/TMBG Secretariat: ISO
Voting begins on: Voting terminates on:
2023-04-21 2023-07-14
Explosive atmospheres —
Part 41:
Reciprocating internal combustion engines
ICS: 29.260.20; 27.020
Member bodies are requested to consult relevant national interests in IEC/SC
31M before casting their ballot to the e-Balloting application.
This document is circulated as received from the committee secretariat.
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31M/182/CDV – 2 – ISO/IEC 80079-41 © IEC:2023
1 CONTENTS
3 1 Scope . 8
4 2 Normative references . 9
5 3 Definitions . 10
6 4 Ignition hazards . 12
7 5 Safety requirements and/or measures . 13
8 5.1 For all equipment protection levels (EPLs) . 13
9 5.1.1 General . 13
10 5.1.2 Ignition hazard assessment . 13
11 5.1.3 Joints . 14
12 5.1.4 Electrical systems . 14
13 5.1.5 Static electricity and bonding requirements . 16
14 5.1.6 Safety and automation systems . 17
15 5.1.7 Flame arresters . 24
16 5.1.8 Spark arresters . 26
17 5.1.9 Engine gas path configuration . 27
18 5.1.10 Fuel system . 29
19 5.1.11 Mechanically generated sparks . 30
20 5.2 Specific requirements for EPL Mb . 31
21 5.2.1 Maximum temperature . 31
22 5.2.2 Gas path . 31
23 5.2.3 Air intake system . 31
24 5.2.4 Exhaust system . 31
25 5.2.5 Fans and other rotating components . 31
26 5.2.6 Compressed air systems. 31
27 5.3 Specific requirements for EPL Gb and EPL Gc . 32
28 5.3.1 Maximum temperature . 32
29 5.3.2 Configuration of flame arresters & spark arresters . 32
30 5.3.3 Gas path . 33
31 5.3.4 Air intake system . 33
32 5.3.5 Exhaust system . 34
33 5.4 Specific requirements for EPL Db and EPL Dc . 34
34 5.4.1 Maximum temperature . 34
35 5.4.2 Air intake system . 34
36 5.4.3 Exhaust system . 34
37 5.4.4 Cold start devices . 35
38 5.4.5 Mechanically generated sparks . 35
39 5.4.6 Compressed air systems. 35
40 6 EPL Gc gaseous fuelled spark ignited engine . 35
41 6.1 General . 35
42 6.1.1 Differences between spark ignited, gas fuelled engines and
43 compression ignition engines . 35
44 6.1.2 Fuel System . 36
45 6.2 Ignition system . 36
46 6.3 Safe Starting Purge . 36
47 6.3.1 Ventilation . 36

ISO/IEC CDV 80079-41 © IEC:2023 – 3 – 31M/188/CDV
48 6.3.2 Engine starting . 36
49 6.3.3 Engine stopping . 37
50 7 Test setup and testing procedures . 37
51 7.1 General . 37
52 7.2 Documentation . 37
53 7.3 Engine operation . 37
54 7.4 Measuring instruments . 37
55 7.5 Temperature measurement . 37
56 7.5.1 Purpose of the test . 37
57 7.5.2 Test procedure . 37
58 7.5.3 Acceptance criteria . 38
59 7.5.4 (Type) Test report / protocol . 39
60 7.6 Pressure determination . 39
61 7.6.1 General . 39
62 7.6.2 Test procedure . 39
63 7.6.3 (Type) Test report . 42
64 7.7 Over pressure test (Gc, Gb and Mb) . 42
65 7.7.1 General . 42
66 7.7.2 Test procedure static test . 43
67 7.7.3 Test procedure alternative dynamic test . 43
68 7.8 Propagation testing . 45
69 7.8.1 General . 45
70 7.8.2 Test set-up . 45
71 7.8.3 Non-transmission test procedure intake system . 48
72 7.8.4 Non-transmission test procedure exhaust side . 50
73 7.9 Crankcase explosion containment testing . 51
74 7.9.1 General . 51
75 7.9.2 Apparatus . 51
76 7.9.3 Test procedure . 52
77 7.9.4 Acceptance criteria . 52
78 7.9.5 Dry type - spark arrester tests (according to 1834-1:2006, 6.4.2) . 52
79 7.9.6 Liquid type – spark arrester tests . 52
80 7.10 Static electricity / Non-metallic material . 53
81 7.11 Verification engine control, alarms and shutdown . 53
82 7.12 Leak test for ducts . 53
83 8 Instructions . 53
84 8.1 Accompanying documents . 53
85 8.1.1 Group I Mining . 53
86 8.1.2 Group II Flammable gas and vapours . 53
87 8.1.3 Group III Combustible dust . 53
88 8.2 Inspection check list .
...