Cyclopedia of heating, plumbing and sanitation; a complete reference work . Wet Return Drip in Mains ;it Intel Floor good drainage with one-pipe ra-diator connections. Coils arenearly always made up with two-pipe connections. In high build-ings, where a large amount ofradiation must be carried byeach riser, they may be madesmaller if two-pipe connectionsarc made with the is often a decided advan-specially if the risers are tobe concealed. Draining Mains and Risers. With long main-, it frequently i-the case that if given a contiguous pitch they would be too low al dieextreme end-
Cyclopedia of heating, plumbing and sanitation; a complete reference work . Wet Return Drip in Mains ;it Intel Floor good drainage with one-pipe ra-diator connections. Coils arenearly always made up with two-pipe connections. In high build-ings, where a large amount ofradiation must be carried byeach riser, they may be madesmaller if two-pipe connectionsarc made with the is often a decided advan-specially if the risers are tobe concealed. Draining Mains and Risers. With long main-, it frequently i-the case that if given a contiguous pitch they would be too low al dieextreme end-: and it i- therefore customary to rise and drip at ,a^ shown in 1 and Fig. 25. Arrangement for Drainingwith Indirect System. 243 20 STEAM AND HOT WATER FITTING Plser DrainingTo Main The siphon trap (Fig. 23) prevents ;i greater pressure being in-troduced along the overhead return than occurs at the extreme end,.since an\ excess in pressure at an intermediate point merely forces down the water in the inlet leg of the siphon trap to a point where the difference in pressure in the twomains is equalized by the higher level of water maintained in theoutlet pipe of the >\ phon trap With indirect systems, themains are frequently drainedthrough the benches or stacks ofradiators, the connections beingtaken from the bottom of themain. It is assumed that all theindirects will not he shut oil atthe same time >cc Fig. 25 . Mains and risers are corn-
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