دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a hard plastic helmet worn by oilfield workers to minimise the danger of being injured by falling objects.

n: the metallic or plastic hat which the drilling works wear on the drilling platform

n: a protective enclosure for a divers entire head. It is part of the life-support system and also contains a communications system.

n: a line attached to a divers helmet by which he or she is lowered and raised in the water.

n: all diving equipment less complex than the standard dress. This equipment employs face masks or helmets, protective clothing, and swim fins or boots.

n: the root mean Square (rms) deviation of the observed values from the average. standard dress n: diving equipment consisting of brass diving helmet, breastplate, heavy dry suit, weighted boots, weighted belt, hose, compressor, and communications.