236
GLOSSARY
Ignition (Autoignition) Temperature. Minimum temperature required to ignite gas or vapor with- out a spark or flame being present. Significant in evaluating the ease at which a flammable materi- al may ignite.
Immediately Dangerous to Life or Health (IDLH). An atmospheric concentration of any toxic, corrosive, or asphyxiant substance that poses an immediate threat to life or would cause irreversible or delayed adverse health effects or would interfere with an individual’s ability to escape from a dangerous atmosphere.
Improvised Explosive Device (IED). A home- made bomb constructed and deployed in ways other than in conventional military action. It may be constructed of conventional military explo- sives or homemade explosives. The IED is attached to a detonating mechanism and may be activated by a timer, motion, or other means.
Incident. (1) The release or potential release of a hazardous material from its container into the environment. (2) An occurrence or event, either natural or man-made, which requires action by emergency response personnel to prevent or minimize loss of life or damage to property and/or natural resources
Incident Action Plan (IAP). The strategic goals, tactical objectives and support requirements for the incident. All incidents require an action plan. For simple incidents (Level I) the action plan is not usually in written form. Large or complex incidents (Level II or III) will require that the action plan be documented in writing.
Incident Command System (ICS). An organized system of roles, responsibilities, and standard operating procedures used to manage and direct emergency operations.
Incident Commander (IC). The individual responsible for establishing and managing the overall incident action plan (IAP). This process includes developing an effective organizational structure, developing an incident strategy and tactical action plan, allocating resources, making appropriate assignments, managing information, and continually attempting to achieve the basic command goals. The IC is in charge of the inci- dent site. May also be referred to as the On-Scene Incident Commander as defined in 29 CFR. 1910.120.
Incident Command Post (ICP). The “on-scene” location where the Incident Commander devel- ops goals and objectives, communicates with subordinates, and coordinates activities between various agencies and organizations. The ICP is the “field office” for on-scene response opera- tions, and requires access to communications, information, and both technical and administra- tive support.
Indicator Papers. Special chemical indicating papers which test for the presence of specific haz- ards, such as oxidizers, organic peroxides, and hydrogen sulfide; usually part of a hazmat iden- tification system.
In-line Inspection. The practice of using pipeline inspection gauges, or “pigs”, to perform various operations on a pipeline without stopping the flow of the product in the pipeline. (Also see “Pigs.”)
In-line Inspection Tools (ILI). Cylinder shaped plugs of roughly the same diameter of a pipeline that are used to inspect and locate anomalies in the pipeline wall before they can progress to the point of causing a leak.
Interface. The point at which two liquid petrole- um products meet and mix when shipped in a pipeline. May also be referred to as transmix.
Interstate Pipeline. A pipeline, or that part of a pipeline, used in the transportation of hazardous liquids or carbon dioxide in interstate or foreign commerce.
Interstate Natural Gas Association of America (INGAA). Professional trade organization that advocates regulatory and legislative positions of importance to the natural gas pipeline industry in North America.
http://www.ingaa.org/
Intrastate Pipeline. A pipeline that is not an interstate pipeline, meaning it does not cross state lines.
Intrinsically Safe Construction. Equipment or wiring is incapable of releasing sufficient electri- cal energy under both normal and abnormal con- ditions to cause the ignition of a flammable mix- ture. Commonly used in portable direct-reading instruments for operations in Class I, Division 2 hazardous locations.
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