By CCPS (Center for Chemical Process Safety)
Complemented via an estimating software spreadsheet in response to a hard and fast set of chemical substances to help in hazard estimations, Probability of Ignition of a published Flammable Mass converts a "best wager" to a calculated price according to to be had info and present know-how. The textual content files and explains the technological know-how and heritage of the technology-based process. The device, while populated with acceptable facts, yields an estimate of the likelihood outlined free up of a flammable fabric will ignite if uncovered to an ignition resource. this data can be utilized to make danger exams with a better measure of self belief than estimates made prior to and it presents useful details to be used within the improvement of a facility's Emergency reaction Plan.
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Additional resources for Guidelines for Determining the Probability of Ignition of a Released Flammable Mass
Furthermore, it was anticipated that any vapor/air mixture with an MIE of 5 mJ or less could be ignited by a person. A value of 25 mJ being discharged from people due to static charges has been suggested (OSHS, 1999), although other values ranging from 10 to 30 mJ are also assumed. 1 Ignition Source Management By far the most common method for managing ignition sources is through instituting proper hazardous area classifications as per various currently available fire protection standards. However, there are limits to the effectiveness of this and other ignition control measures.
The development of the quantified risk-based methodologies in recent years has been accompanied by tremendous advancements in the theory, tools, and software available to predict the consequences of fires and explosions. Although the methods for consequence analysis continue to improve, one can argue that the methods for consequence analysis are fairly mature and thus address half of the "risk equation": Risk = /(Consequence, Frequency) or, in terms familiar to practitioners of layers of protection analysis: Risk = Consequence x Frequency/Risk Reduction Factors The frequency side of the risk equation seems simpler conceptually and does not need to invoke Gaussian plume or computational fluid dynamics or other relatively higher mathematical solutions.
The Occupational Safety and Health Service (OSHS, 1999) notes that "pure gases discharged at high velocity through jets under conditions where neither liquid droplets nor solid particles are present, seldom acquire sufficient static charge to result in ignition. " Thus streams that form droplets during discharge, such as liquefied petroleum gas (LPG), or releases that are accompanied by particulates discharged from the same equipment are more prone to static ignition than they might otherwise be based on their chemical properties alone.
Guidelines for Determining the Probability of Ignition of a Released Flammable Mass by CCPS (Center for Chemical Process Safety)