. Science of railways . g the oil out of a lubricator providing thewater valve is open and there is no check in water tubeor water passage (See Note C), or if there is scale or sedi-ment above this check to prevent it from seating. If all theseconditions are present at one time then oil could be syphonedout of the lubricator. Some engineers make a practice of opening the watervalve first before the steam valve, or of closing the steamvalve before the water valve. This is a bad practice, es-pecially when a locomotie is drifting, as it places a lubrica-tor in a very favorable condition to syphon
. Science of railways . g the oil out of a lubricator providing thewater valve is open and there is no check in water tubeor water passage (See Note C), or if there is scale or sedi-ment above this check to prevent it from seating. If all theseconditions are present at one time then oil could be syphonedout of the lubricator. Some engineers make a practice of opening the watervalve first before the steam valve, or of closing the steamvalve before the water valve. This is a bad practice, es-pecially when a locomotie is drifting, as it places a lubrica-tor in a very favorable condition to syphon out the oil if itis not protected by a check. Caution.—Always open steam valve first and water valvelast at a terminal or elsewhere. Always close WEvter valve LOCOMOTIVE APPLIANCES. 443 first and steam valve last. If these instructions are followedtnere never will be any occasion to report the lubricatorsyphoning, as a vacuum cannot be produced in the condenserand oil pipes when steam pressure is in the same. NO. Fig. 12. Expansion- Chamber.—This is a feature thathas been added to the No. 21 type of lubricatorin order to provide a space for the expansion ofoil, thereby relieving the body to «ome extent fromthat abnormal pressure when the lubricator isfilled with cold oil, and at the same time prevent- t 444 LOCOMOTIVE APPLIANCES, ing the oil from expanding back up into the con-denser as it did in the old type of lubricator. The expansion chambers vary in capacityaccording to the number of feeds: in No. 11, threeounces; in No. 21, four ounces; in No. 31, fiveounces; in No. 41, six ounces. It should be remem-bered always that the hotter the oil before it isput in the lubricator, the less it will expand. The practice of filling a lubricator full of coldoil at about 60 or 70 degrees temperature is con-demned. If it is found necessary to use cold oil,owing to limited time or other conditions at thecommencement of a trip, % full is ample, as theoil will expand very rapidly
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