CCPS Process Safety Glossary
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The combination of concentration and time for inhalation of a toxic gas that... Read More... |
A gas having a health hazard rating of 3 or 4 as defined in NFPA 704. |
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In the context of these guidelines, a measure of the danger posed to living... Read More... |
The quality, state, or degree to which a substance is poisonous and/or may... Read More... |
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Any region marking the area where one formula is used at smaller values of... Read More... |
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A partial discharge from a nonconductive layer on a conductive substrate.... Read More... |
The fraction of radiant energy that is transmitted from the radiating object... Read More... |
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A bidirectional rectifier (essentially two SCRs in parallel) that function... Read More... |
Charge separation caused by rubbing of surfaces, creating “triboelectricity... Read More... |
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The cube of ten thousand. Similarly in the US system, a billion is the cube... Read More... |
The ratio of the turbulent velocity to the mean wind speed (e.g., óu/u).... |
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See Burning Velocity |
Rate of spread in the vertical (z), lateral (y), or downwind (x) directions... Read More... |
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Components of turbulent speed fluctuations. For example, the lateral,... Read More... |
A time during which a unit is shut down for repair and maintenance after a... Read More... |
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A four digit number used by both the United Nations and the U.S. Department... Read More... |
The probability the fault event exists at a specified time. |
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A measure, often quantitative, of the degree of doubt or lack of certainty... Read More... |
When a flammable vapor is released, its mixture with air will form a... Read More... |
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The probability the fault event exists at a specified time or occurs during... Read More... |
Actual root causes. |
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A base event that is not developed because of insufficient consequence or... Read More... |
An in-line flame arrester that is designed to stop flame propagation... Read More... |
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A power supply that employes automatic switching of main power supply from... Read More... |
The side of a flame arrester and system to which it is connected where flame... Read More... |
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The probability that the fault event occurs during a specified time interval... |
A failure may lie dormant in the system and only be discovered as a result... Read More... |
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Tending toward decomposition or other unwanted chemical change during normal... Read More... |
See Overdriven Detonation. |
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A material that, in the pure state or as commercially produced, will... Read More... |
Substance or material which in a pure state or as normally produced... Read More... |
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To revise a prior PHA, as required, to reflect any changes that have... Read More... |
That concentration of a combustible material in air above which ignition... Read More... |
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The highest molar (or volume) concentration of a combustible substance in an... Read More... |
The highest concentration of a vapor or gas (the highest percentage of the... Read More... |