The automatic cab signal system shall be arranged so that cab signals will be continuously controlled in accordance with conditions described in Â§ 236.205 that obtain at least stopping distance in advance. Â§ 236.512 Cab signal indication when locomotive enters block where restrictive conditions obtain.
Dissolved oxygen (DO) is a measure of the quantity of free oxygen molecules in water. The concentration of DO is an important indicator of the health of an aquatic ecosystem because oxygen is essential for almost all forms of life. Oxygen is necessary for respiration and for some chemical reactions.
EXAMPLE E.1 A vessel with a gross volume of 6,3 m 3 has 3 m 3 of liquid in it, and forty 25 kg bags of powder are to be added down a chute over one hour. An oxygen-free inert gas purge of 1 m 3 hr -1 is fed to the vessel continuously during the addition.irstly, the appropriate equation to use is equation (19). The ullage space in the vessel is the gross volume less the liquid volume, i.e. (6,3 - 3) m 3 = 3,3 m 3. The initial oxygen concentration is 2 % v/v, so therefore the volume of oxygen in the vessel at the start, V 0, is 3,3 m 3 x 0,02 = 0,066 m 3.