🔥🔥 Don’t Miss Out on Our End of Autumn Sale. If you have any questions, feel free to click the bottom right corner to contact our customer service..

Concat us[email protected]
Shopping Cart

No products in the cart.

🔍
BS EN 14986:2024

BS EN 14986:2024

$198.66

Design of fans working in potentially explosive atmospheres

Published By Publication Date Number of Pages
BSI 2024 66
PDF Format Searchable Printable Preview Now
Guaranteed Safe Checkout
Categories: ,

If you have any questions, feel free to reach out to our online customer service team by clicking on the bottom right corner. We’re here to assist you 24/7.
Email:[email protected]

1.1 This document specifies the constructional requirements for fans constructed to Group II G (of explosion groups IIA, IIB and hydrogen) categories 1, 2 and 3, and Group II D categories 2 and 3, intended for use in explosive atmospheres. NOTE 1 Operation conditions for the different categories of fans used in this document are defined in Clause 4. 1.3 This document specifies requirements for design, construction, testing and marking of complete fan units intended for use in potentially explosive atmospheres in air containing gas, vapour, mist and/or dusts. Such atmospheres can exist inside (the conveyed atmosphere (flammable or not)), outside, or inside and outside of the fan. This document covers mechanical equipment, in particular fans. The “type of protection” as specified in EN ISO 80079 37:2016 is constructional safety. 1.4 This document is applicable to fans working in ambient atmospheres and with normal atmospheric conditions at the inlet, having — absolute pressures ranging from 0,8 bar to 1,1 bar, — and temperatures ranging from −20 °C to +60 °C, — and maximum volume fraction of 21 % oxygen content, — and an aerodynamic energy increase of less than 25 kJ/kg. NOTE 1 25 kJ/kg is equivalent to 30 kPa at inlet density of 1,2 kg/m3. This document can also be helpful for the design, construction, testing and marking of fans intended for use in atmospheres outside the validity range stated above or in cases where other material pairings need to be used. In this case, the ignition risk assessment, ignition protection provided, additional testing (if necessary), manufacturer’s marking, technical documentation and instructions to the user, clearly demonstrate and indicate the equipment’s suitability for the conditions the fan can encounter. NOTE 2 Temperatures below −20 °C can be considered. Material suitability can require specific evaluation for these temperatures. With lower temperature the explosion pressure increases, which leads to increased test pressures (see A.3) and can require specific testing. Although the standard atmospheric conditions in EN ISO 80079 36:2016 give a temperature range for the atmosphere of −20 °C to +60 °C the normal ambient temperature range for the equipment is −20 °C to +40 °C unless otherwise specified and marked. 1.5 This document does not apply to: — group I fans (fans for mining); — explosion group IIC (other than hydrogen); — category 1D fans; — cooling fans or impellers on rotating electrical machines; — cooling fans or impellers on internal combustion engines, vehicles or electric motors. NOTE 3 Measures for category 1D fans are given in EN 1127 1:2019. NOTE 4 Measures for explosion group IIC (other than hydrogen) are given in EN 1127 1:2019. NOTE 5 Measures for explosion group I are given in EN ISO/IEC 80079 38:2016 and EN 1127 2:2014.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 European foreword
9 Introduction
10 1 Scope
11 2 Normative references
3 Terms and definitions
12 4 Requirements for all fans
4.1 Ignition hazard assessment
4.1.1 General
4.1.2 Normal operating conditions
4.1.3 Expected malfunction
13 4.1.4 Rare malfunction
4.2 Assignment of categories
4.2.1 General
4.2.2 Influence of external parts on internal hazards and vice-versa
4.2.3 Leakage
14 4.3 Temperatures
4.3.1 General
4.3.2 Maximum surface temperature
4.3.3 Temperature of the conveyed atmosphere (flammable or not)
15 4.4 Mechanical design criteria
4.4.1 General
4.4.2 Clearance between rotating elements and the fan casing
16 4.5 Casing
4.5.1 General
4.5.2 Gas tightness
4.6 Impellers
17 4.7 Materials for rotating and stationary parts of fans
4.7.1 General
4.7.2 Permissible material pairings
18 Table 1 — Permissible material pairings for gas explosion groups IIA and IIB and dust applications
22 Table 2 — Permissible material pairings for gas mixtures containing hydrogen for category 1G and 2G
23 4.8 Linings and tip extensions
24 Table 3 — Minimum thickness of linings
4.9 Vibration
25 4.10 Earthing conducting parts
4.11 Electrostatic charges
4.12 Electrical equipment
4.13 Prevention of deposits inside the fan
4.14 Shaft seals
26 4.15 Bearings
4.16 Power transmission systems
4.17 Clutches and couplings
4.18 Brakes and braking systems
4.19 Impeller-shaft attachment
27 Figure 1 — Fixed bush
29 Figure 2 — Taper bush
30 4.20 Corrosion of fan components
4.21 Fire resistance
4.22 Protection against foreign particles
5 Additional requirements for category 2
5.1 General
5.2 Impeller-shaft attachment
5.3 Vibration
31 5.4 Material pairings
6 Category 1G fans for specific use with a gaseous explosive atmosphere as a conveyed atmosphere (flammable or not)
6.1 General requirements
6.2 Flame arresters
6.2.1 General
6.2.2 Stabilized burning
6.3 Casings
6.3.1 General
32 6.3.2 Gas tightness
7 Information for use
7.1 General
7.2 Accompanying documentation
34 7.3 Markings
35 Annex A (normative) Additional requirements for category 1G fans
A.1 General
A.2 Flame transmission test
Figure A.1 — Test apparatus for the flame transmission test
36 A.3 Pressure test
38 Annex B (informative) Classification of requirements for the different categories
Table B.1 — Classification of requirements for the different categories
42 Annex C (informative) Checklist for verification of the safety requirements and/or protective measures
C.1 General
C.2 All categories
43 C.3 Category 2 – Gas and dust
C.4 Category 1 – Gas
44 Annex D (informative) Examples of types of fans showing ignition minimizing features
Figure D.1 — Axial fan with fixed pitch blades and ducted inlet for categories 2 and 3
45 Figure D.2 — Axial fan with variable pitch in-motion ducted inlet-box arrangement
46 Figure D.3 —Mixed flow belt driven ducted fan
47 Figure D.4 — Centrifugal fan, coupling driven- ducted arrangement – General illustration
48 Figure D.5 — Centrifugal fan, coupling driven- ducted arrangement – Details
49 Figure D.6 — Centrifugal fan, direct driven by foot flanged motor- ducted arrangement
50 Figure D.7 — Centrifugal fan, direct driven by on-flanged motor- ducted arrangement
51 Figure D.8 — Typical fan drive belt guard details
52 Annex E (normative) List of significant hazards
53 Table E.1 — Identification of hazards and required countermeasures
57 Annex F (informative) Significant changes between this document and EN 14986:2017
Table F.1 — Significant changes with respect to EN 14986:2017
59 Annex ZA (informative) Relationship between this European Standard and the essential requirements of Directive 2014/34/EU aimed to be covered
Table ZA.1 — Correspondence between this European Standard and Directive 2014/34/EU
63 Bibliography

Related products

BS EN 14986:2024
$198.66