What is BS EN 15967 - Determination of maximum explosion pressure about?
BS EN 15967 discusses the determination of maximum explosion pressure and the maximum rate of pressure rise of gases and vapours. Gas usually contains a single thermodynamic state at room temperature. Vapour has a collection of particles without any definite shape when observed under a microscope.
BS EN 15967 specifies a test method that is designed to measure the explosion pressure and the maximum explosion pressure, the rate of explosion pressure rise, and the maximum rate of explosion pressure rise of a quiescent flammable gas/air/inert mixture in a closed volume at ambient temperature and pressure. In BS EN 15967, the term “gas” includes vapours but not mists.
Note 1: Detonation and decomposition phenomena are not considered in BS EN 15967.
Note 2: The pressures and rates of pressure rise measured by the procedures specified in BS EN 15967 are not applicable to flameproof enclosures, i.e., enclosures intended to withstand an internal explosion and not to transmit it to an external explosive atmosphere, or any other closed volume where the internal geometry can result in pressure piling. Even in an enclosure of relatively simple geometry, the disposition of the internal components can lead to rates of pressure rise significantly higher than those measured using BS EN 15967.
Note 3: BS EN 15967does not apply to the design and testing of flameproof enclosures in conformity with EN ISO 80079-37 (for non-electrical equipment) and EN 60079-1 (for electrical equipment).
Who is BS EN 15967 - Determination of maximum explosion pressure for?
BS EN 15967 on the determination of maximum explosion pressure is useful for:
- Chemical industry
- Gas generation plants
- Petrochemical industry
- Quality control personnel
Why should you use BS EN 15967 - Determination of maximum explosion pressure?
Vapour is a mixture of two or more different phases at room temperature, these phases are liquid and gaseous phases. BS EN 15967 describes test methods for the determination of the explosion pressure and the maximum explosion pressure, the rate of explosion pressure rises, and the maximum rate of explosion pressure rise of a quiescent flammable gas/air/inert mixture at ambient temperature and pressure. Maximum explosion pressure and maximum rate of explosion pressure rise are used for designing explosion protection measures, such as explosion pressure resistant or explosion pressure shock resistant apparatus, explosion venting and explosion suppression. These characteristics are particularly influenced by the size and shape of the vessel, the type and energy of the ignition source, the temperature and pressure, and the level of turbulence.
The test apparatus consists of a test vessel, equipment for preparing the test mixture, an ignition system, a pressure measuring system, a temperature measuring device and safety equipment. The igniter is positioned in the centre of the test vessel. Recommended ignition systems are induction spark and fusing wire. The test report is which ignition source was used. For some special mixtures, it may be necessary to use a different ignition system in order to achieve ignition of the mixture. If an alternative ignition source is used it is fully described in BS EN 15967. It is also recommended that specialist advice is sought on the interpretation of the results. Using BS EN 15967 you can specify a test method that is designed to measure the explosion pressure and the maximum explosion pressure, the rate of explosion pressure rise, and the maximum rate of explosion pressure rise of a quiescent flammable gas/air/inert mixture.
What’s changed since the last update?
BS EN 15967:2022 supersedes BS EN 15967:2011. BS EN 15967:2022 includes some technical changes with respect to BS EN 15967:2011. These include:
- Added standards to reference on design of test vessel
- Changed criterion for reducing the number of tests to relative scatter and added an explanatory note
- Note 1 has been edited a third and a note 2 inserted on pressure ratios
- Comment on KG has been made into a note and reference corrected
- Informative annexe added on the dependence of pressure ratio on temperature