Cyclopedia of heating, plumbing and sanitation; a complete reference work . e somewhat smallerthan in up-feed systems. This system lias the ad-vantage of placing the bigpipes in the attic, where theirheating effect is less objectionable than in the basement. As the pipesgradually decrease in size from top to bottom, this gives small pipeson the lower Moors, which in modem buildings generally contain a fewlarge rooms and little space forconcealing pipes. It is f re-quently advisable to combinewith this system the up-feedmethod of heating the first floor,which is generally high-studdedand requir
Cyclopedia of heating, plumbing and sanitation; a complete reference work . e somewhat smallerthan in up-feed systems. This system lias the ad-vantage of placing the bigpipes in the attic, where theirheating effect is less objectionable than in the basement. As the pipesgradually decrease in size from top to bottom, this gives small pipeson the lower Moors, which in modem buildings generally contain a fewlarge rooms and little space forconcealing pipes. It is f re-quently advisable to combinewith this system the up-feedmethod of heating the first floor,which is generally high-studdedand requires a large amount ofradiation. Relieving the down-feed system of this load meanssmaller risers throughout thebuilding, which, in the modernsky-scraper, results in a savingthat more than offsets the cost ofthe separate up-feed system for the lower floor. Another reason whyit is advisable to put the lower floor on a separate system, is that thesteam is dry, whereas the steam from an overhead system becomespretty wet from condensation by the time it reaches the lower Sea led Drip S^J Pig. 23. Siphon Trap. 242 STEAM AND HOT WATER FITTING 19 One-Pipe System. The one-pipe up-feed} system is most com-monly used in connection with relatively small heating plant-. It hasthe advantage of simplicity, there being but a single valve to tall buildings with the up-feed system, the risers must be objection- ably large to provide for the pas-sage of steam up, and water ofcondensation down, the samepipe. With the overheadtern, the risers may be made con-siderably .-mailer, since the wateris not hindered in its passage bya flow of steam in the oppositedirection. With this one-pipesystem, the radiator he short and pi tche< 1downward toward the risers toavoid pocket-. When used in high buildings with the overheadtern, the lower portion of the risers must he liberally the steam will become too wet. The Two-Pipe System. This system is co
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