Steam power plants, their design and construction . high-pres-sure drip lines should be thoroughly covered with a non-con-ducting covering. Low-pressure drips contain the condensation drawn from pipes?carrying exhaust steam, steam condensed in feed-water heaters•of the closed type, the drip from engine and pump cylinders andthe drip from grease separators. All of this condensation should STEAM, POWER PLANTS. 81 be thrown away on account of the grease that it contains, unlesssome form of oil filter is used. All low-pressure drips shouldbe trapped independently into a drip main which can be led
Steam power plants, their design and construction . high-pres-sure drip lines should be thoroughly covered with a non-con-ducting covering. Low-pressure drips contain the condensation drawn from pipes?carrying exhaust steam, steam condensed in feed-water heaters•of the closed type, the drip from engine and pump cylinders andthe drip from grease separators. All of this condensation should STEAM, POWER PLANTS. 81 be thrown away on account of the grease that it contains, unlesssome form of oil filter is used. All low-pressure drips shouldbe trapped independently into a drip main which can be led toany convenient place, such as the sewer, the pipe carrying off thedischarge from the condenser, etc. Feed-water piping.—Feed-water piping is sometimes put to-gether with screwed and sometimes with flanged fittings, and theseare either of brass or cast iron. The pipe is of brass or extraheavy wrought iron. The screwed fittings are said to be capable QUD (Check Valvz. SI^ ?Injector. Auxiliary Heater - ^ (^rimc^) Heaf<Q. Air Pump Th( ENOiNEERINa RECORD. Figure 29.—Feed Piping for Condensing Plant. of Standing a pressure of 150 pounds, but for pressure over 125pounds flanged fittings are frequently used. It is better to useelbows with a long radius to reduce friction. Gate valves shouldbe used instead of globe valves, for the same reason. An arrangement for feed-water piping for a typical plantequipped with surface condensers is shown in diagram by Figure29. The plant is supposed to contain three engines, each with anindependent air pump and surface condenser, two boiler feed-pumps, a primary heater in the exhaust pipe of each engine, be-tween the engine and surface condenser, and a single auxiliaryheater of the closed type receiving the exhaust steam of the airpumps and the boiler-feed pumps. The steam condensed in eachcondenser is drawn therefrom by the air pumps and forced intoa hot well, from which the boiler-feed pumps draw their supply. 82 STEAM P
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