1 Scope
This standard specifies requirements for explosion-pressure-resistant and explosion-pressure-shock resistant equipment.
This standard is applicable to process vessels and systems. It is not applicable to individual items of equipment such as motors and gearboxes that may be designed to have a construction as specified in Non-electrical equipment for use in potentially explosive atmospheres - Part 3: Protection by flameproof enclosure “d” and withstand an internal explosion.
This standard is valid for atmospheres having pressures ranging from 0.08MPa to 0.11MPa and temperatures ranging from -20℃ to +60℃. This standard may also be helpful for the design, construction, testing and marking of equipment intended for use in atmospheres outside the validity range stated above, as far as this subject is not covered by specific standards.
This standard is applicable to equipment and combinations of equipment where deflagrations may occur and is not applicable to equipment and combination of equipment where detonation may occur. This standard shall not be used for offshore applications.
Note: This standard is only used for equipment made of metallic materials only.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 228 Metallic materials - Tensile testing at ambient temperature (GB/T 228-2002; eqv ISO 6892:1998)
GB/T 2900.35 Electrotechnical terminology - Equipment for explosive atmospheres (GB/T 2900.35-2008, IEC 60050-426:2008, IDT)
GB/T 19001 Quality management systems - Requirements (GB/T 19001-2008, ISO 9001:2008, IDT)
EN 1092-1 Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges
EN 10204 Metallic products - Types of inspection documents
EN 13445-1 Unfired pressure vessels - Part 1: General
EN 13445-2 Unfired pressure vessels - Part 2: Materials
EN 13445-3 Unfired pressure vessels - Part 3: Design
EN 13445-4 Unfired pressure vessels - Part 4: Fabrication
EN 13980 Potentially explosive atmospheres - Application of quality system
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in GB/T 2900.35 and the following apply.
3.1
deflagration
explosion propagating at subsonic velocity
3.2
detonation
explosion propagating at supersonic velocity and characterized by a shock wave
3.3
explosion
abrupt oxidation or decomposition reaction producing an increase in temperature, pressure, or in both simultaneously
3.4
explosion resistant
property of vessels and equipment designed to be either explosion-pressure-resistant or explosion-pressure-shock resistant
3.5
explosion-pressure-resistant
property of vessels and equipment designed to withstand the expected explosion pressure without becoming permanently deformed
3.6
explosion-pressure-shock resistant
property of vessels and equipment designed to withstand the expected explosion pressure without rupturing, but allowing permanent deformation
3.7
maximum explosion pressure
pmax
maximum pressure occurring in a closed vessel during the explosion of a specific explosive atmosphere determined under specified test conditions
3.8
maximum allowable explosion pressure
pexmax
calculated maximum explosion pressure which the equipment will withstand
3.9
reduced explosion pressure
pred
pressure generated by an explosion of an explosive atmosphere in a vessel, protected by either explosion relief or explosion suppression
Foreword i
Introduction ii
1 Scope
2 Normative references
3 Terms and definitions
4 Explosion resistant equipment
5 Explosion-pressure-resistant design
6 Explosion-pressure-shock resistant design
7 Documentation of quality of explosion resistant equipment
8 Information for use
Annex A (Normative) Calculation of design pressure
Annex B (Informative) Examples for limitation of stress concentration
