O

68 Results
  • Override

    A manual means of changing the operation of an automatically-controlled device or a system.

  • Overspeed protective device

    Each main propulsion engine which can be declutched or which drives a CP propeller is to be fitted with an overspeed...

  • Oxygen

    A colourless, odourless gas which occupies about 20% of the atmosphere. It is essential for support of combustion...

  • Oxygen analyser/meter

    An instrument for determining the percentage of oxygen in a sample of the atmosphere drawn from a tank, pipe or...

  • Oxygen cutting

    A group of thermal cutting processes that separates or removes metal by means of the chemical reaction between...

  • Oxygen gouging

    Thermal gouging that uses an oxygen cutting process variation to form a bevel or groove.

  • Ozone depleting substances (ODS)

    These are man-made chemicals which degrade the ozone layer in the upper atmosphere and which are being phased out...

  • Ozone depletion potential (ODP)

    The ODP of a compound is defined as the ratio of the total amount of ozone destroyed by that compound to the amount...

Download the Encyclopedia