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Glossary UEL The Upper Explosive Limit is the highest concentration of the material in air that can be detonated. UHF Ultrahigh frequencies ranging from 300 to 3000 MHz. North American TV channels 14 to 83. ULTIMATE CAPACITY Total capacity of a water supply system, including residential and industrial consumption, available fire flow, and all other taxes on the system. ULTRA-HIGH-PRESSURE A container designed to withstand pressures from 3,000 to 6,000 psi. UMBILICAL AIR RESPIRATOR A breathing device whereby an air or oxygen hose is supplied (in an unlimited amount) by a remote compressor or supply tank. UN/NA IDENTIFICATION NUMBER The four-digit identification number assigned to a hazardous material by the Department of Transportation; on shipping documents may be found with the prefix "UN" (United Nations) or "NA" (North American). The ID numbers are not unique and more than one material may have the same ID number. UNDERCARRIAGE Portion of a vehicle's frame that is located beneath the vehicle. UNDERFLOW DAM A diversion of current flowing beneath the surface, or not in the same direction with the surface current. A tactical consideration for containment or control of liquids when dealing with materials lighter or heavier than water, depending on the operation objectives. UNDERWRITERS' LABORATORIES, INC. (UL) A fire research and testing laboratory maintained by capital stock and fire insurance companies. UNIFIED COMMAND The process of determining overall incident strategies and tactical objectives by having all agencies, organizations, or individuals who have jurisdictional responsibility, and in some cases those who have functional responsibility at the incident, participate in the decision-making process. UNIFORM Official dress uniform or work uniform different from protective clothing. UNIVERSAL COUPLING A coupling device that permits unlike couplings to be connected. See Adapter. UNIVERSAL CYLINDER A cylinder constructed and fitted with appurtenances in such a manner that it can be connected for service with its longitudinal axis in either the vertical or the horizontal position, and so that its fixed maximum liquid level gauge, pressure relief device(s), and withdrawal appurtenance will function properly in either position. UNLINED FIRE HOSE Fire hose, commonly of synthetic fiber construction, without rubber lining; most frequently used in interior standpipe systems and in forest fire fighting. See Linen Hose. UNLOADING SITE Place in the water shuttle operation where tankers unload their water into portable tanks. Also called the Dump Site. UNPROTECTED OPENINGS Openings in floors, walls, or partitions that are not protected against the passage of smoke, flame, and heat; generally used in reference to such openings in fire walls. UNPROTECTED STEEL Steel structural members that are not protected against exposure to heat. UNSTABLE (CHEMICAL) The condition of a chemical compound that easily decomposes or readily changes into other compounds or elements. UNSTABLE (PHYSICAL) The condition of something not firmly fixed or stable in nature. It is easily moved or shaken or likely to break down, rupture, or fail. UNSTABLE MATERIALS Substances capable of rapidly undergoing chemical changes or decomposition. UPLINK The earth station electronics and antenna that transmits information to a communication satellite. UPPER EXPLOSIVE LIMIT (UEL) The highest concentration of the material in air that can be detonated. The maximum fuel-to-air mixture where combustion can occur. UPWIND In or towards the direction from which the wind blows. To be upwind of an item, the wind would be blowing from your position to the item. URTICANT A chemical agent that produces irritation at the point of contact, resembling a stinging sensation, such as a bee sting. For example, the initial physiological effects of phosgene oxime (CX) upon contact with a person’s skin. URTICARIA A skin condition characterized by intensely itching red raised patches. UTILITY MAP A site drawing indicating the location of underground utilities, such as gas, water, electricity, or other piping. |
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