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I

in-line flame arrester
a flame arrester which is fitted with two pipe connections one on each side of the flame arrester element
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inert gas
-
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inerting
addition of inert substances to prevent explosive atmospheres
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integrated temperature sensor
a temperature sensor to indicate a stabilized flame and integrated into the flame arrester by the manufacturer
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L

leak rate
leakage of a device in volume per time (liter per second)
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left-hand wound
orientation (angle) of gaps of crimped ribbon element
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lift
actual travel of the valve disc away from the closed position
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limiting oxygen concentration (LOC)
maximum oxygen concentration in a mixture of a flammable substance and air and an inert gas, in which an explosion will not occur, determined under specified test conditions (EN 1127-1:1997)
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M

maximum operating temperature
maximum temperature reached when Equipment or Protective System is operating at its intended operating conditions
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measurable type (static flame arrester)
a flame arrester where the quenching gaps of the flame arrester element can be technically drawn, measured and controlled
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most easily ignitable explosive atmosphere
explosive atmosphere with a concentration of flammable substances which under specified conditions, requires the lowest energy for its ignition
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N

nominal size, nominal diameter
(DN) a numerical size designation used for all components of a piping system, for which the external diameter or the size of thread is not indicated. The figure is a rounded and has only an approximate relation to the machined dimensions
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non -measurable type (static flame arrester)
a flame arrester where the quenching gaps of the flame arrester element cannot be technically drawn, measured or controlled (e.g. random such knitted mesh, sintered metal and gravel beds)
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normal pressure venting
-
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normal vacuum venting
-
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O

opening pressure
-
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operating pressure
-
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overpressure
pressure increase over the set pressure, at which the safety valve attains the lift specified by the manufacturer, usually expressed as a percentage of the set pressure
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P

pallet guidance
element of valve providing guidance of valve pallet
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pallet type valve (disc valve)
valve with discoidal seal and axial guide
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