an adjustable means to limit the maximum setting of the device towards the hot position, limiting the maximum discharge temperature.
1. tongs for turning large pipe. Consists of a lever with notched head whose teeth engage the pipe and an adjustable short chain which encircles the pipe and whose ends are secured to the head. 2. a lever handle with jaws with teeth and a chain. 3. a form of wrench utilizing a chain.
a colorless, nonflammable gas used in making heat resistant and acid resistant plastics such as teflon.
a water quality impairment to a degree which does not create a health hazard, but does adversely and unreasonably affect the water for domestic use. Pollution will make the water look, smell, and/or taste bad, but illness or death will not result.
an impairment of the quality of the water which creates an actual health hazard to the public health through poisoning or through the spread of disease by sewage, industrial fluids or waste.
non-metallic pipe made by combining an interwoven structure of threads of cellulose material with a bituminous material such as asphalt. Usually spelled fibre. Used for sewers and drains, sleeves and conduits between 1949 and 1971
the maximum pressure obtained in a branch line as caused by rapid valve closure.