UPPER EARNINGS LIMIT. The maximum amount of earnings (equal to approximately seven times the lower earnings limit) on which NI contributions are payable by employees.
UPPER EXPLOSIVE LIMIT. The point at which the concentration of a gas in air becomes too great to allow an explosion upon ignition due to insufficient oxygen present. Found in: Water Treatment Plant Operation, Vol I & II Water Distribution System O&M Small Water System O&M Operation of Wastewater Treatment Plants, Vol II Pretreatment Facility Inspection
Upper explosive limit. The maximum concentration of a combustible gas in air which will ignite if a source of ignition is present. Used interchangeably with the term "upper flammability limit" (UFL).
Upper Explosive Limit, highest concentration of a flammable liquid vapour and air mixture expressed as a percentage by volume in air, in which an explosion will occur on ignition in a confined area
Upper Explosive Limit. Maximum concentration of a gas in percent that will combust in the atmosphere.
See UPPER EXPLOSIVE LIMIT.
Upper Explosive Limit. Also known as Upper Flammable Limit (UFL). The highest concentration (expressed in percentage of vapor or gas by air volume) of a substance that will burn or explode when an ignition source is present. Theoretically, above this limit the mixture is said to be too "rich" to support combustion. The range is between the LEL and the UEL, constitutes the flammable range, or explosive range of a substance. For example, if the LEL is 1 ppm and the UEL is 5 ppm, then the explosive range of the chemical is 1 ppm to 5 ppm.
upper flammable or explosive limit
Upper Explosive Limit. The concentration of flammable gas or vapour in air below which an explosive gas atmosphere will be formed
Upper earnings limit. This is the highest amount of earnings on which employees pay national insurance . The employer still pays national insurance for earnings above this limit.
upper explosive limit. the concentration of flammable vapors is above a level which will result in a flame given an ignition source. There is not enough oxygen to support combustion (the mixture is too rich to ignite).
Upper explosive limit. The highest concentration (expressed in percent vapor or gas in the air by volume) of a substance that will burn or explode when an ignition source is present.
The Upper Explosive Limit is the highest concentration of the material in air that can be detonated.
UPPER EXPLOSIVE LIMIT. The highest concentration of the material in air that can be detonated. The maximum fuel-to-air mixture where combustion can occur.