. Science of railways . ature. Some-times the water feed valve or feed stem seat may leak, and inorder to fill the lubricator in this heated condition it isfound necessary to shut off all steam pressure to the lubri-cator, including the air pump, and owing to the high tem-perature of the condenser the water flashes into steam, prac-tically emptying the condenser and feed glasses of all oil reservoir being very hot, the oil expands rapidly,and the filler plug is usually put in before the reservoir isfull. The steam and water pressures are hurriedly turnedon and the feeds are opened be
. Science of railways . ature. Some-times the water feed valve or feed stem seat may leak, and inorder to fill the lubricator in this heated condition it isfound necessary to shut off all steam pressure to the lubri-cator, including the air pump, and owing to the high tem-perature of the condenser the water flashes into steam, prac-tically emptying the condenser and feed glasses of all oil reservoir being very hot, the oil expands rapidly,and the filler plug is usually put in before the reservoir isfull. The steam and water pressures are hurriedly turnedon and the feeds are opened before sufficient time has elapsedfor condensation to accumulate. The feeds will not respondunder such conditions because the positive and negative pres-sures have equalized and the lubricator is said to be air bound. How TO Overcome.—Open all feeds and any one of thesight feed drain stems. This will allow the water in theoil tubes and the air or gas occupying the highest space in LOCOMOTIVE APPLIANCES, 433 tsf/ NO. 1 |gg^i 1 I i^g^i 1 I |g^*i i FRONT 8. 434 LOCOMOTIVE APPLIANCES. the oil reservoir to escape to atmosphere. The oil willquickly follow. Then shut this feed and vent stem until thecondensation again fills the sight feed chamber. Getting New or Rebuilt Locomotive Ready for Service.—In getting a new or rebuilt locomotive ready for service,disconnect oil pipes at steam chest, and blow out thoroughlyboth oil pipes and automatic steam chest valves, also dis-connect coupling to air pump and see that choke is this several times while getting the locomotive ready forservice. Irregular Feeding or Racing.—If a lubricator feeds ir-regularly, look for the trouble at the automatic steam chestvalves or in such chokes as are located at the lubricator endof tallow pipes. When the opening through any of* thesechokes is enlarged above the standard, the feed will raceor be more rapid. Care of Lubricator.—With high steam pressure there isa tendency, even wi
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