Glossary of Water and Wastewater Terms
A B C D E F G H I J K L M N O P Q R S T U V W Y Z5 random terms from our glossary
upper explosive limit (UEL)
The highest concentration of a gas or vapor (percentage by volume in air) above which a flame will not spread in the presence of an ignition source (arc, flame, or heat). Concentrations higher than UEL are “too rich” to burn. Also called upper flammable limit (UFL). Also see lower explosive limit.
residue
The dry solids remaining after the evaporation of a sample of water or sludge. Also see total dissolved solids.
thrust block
A mass of concrete or similar material appropriately placed around a pipe to prevent movement when the pipe is carrying water. Usually placed at bends and valve structures.
domestic service
A connection to a wastewater collection system for hookup of a residential-type building.
chlorine residual analyzer
An instrument used to measure chlorine residual in water or wastewater. This instrument also can be used to control the chlorine dose rate.
