Heating and ventilating buildings : a manual for heating engineers and architects . FlG. 185. — ILLUSTRATION OF WATER HELD BY GLOBE VALVE. which when open offer no special impediment to the flow, andwhich close sufficiently tight to prevent circulation, althoughnot sufficient to prevent leaks. See page 131. 113. Piping for Indirect Heaters.—Indirect radiators havebeen described and methods of setting them illustrated in Article 69, page radiators are gen-erally set in a case or boxwhich is suspended fromthe basement ceiling andmade of matched boardslined with tin, Fig. sides
Heating and ventilating buildings : a manual for heating engineers and architects . FlG. 185. — ILLUSTRATION OF WATER HELD BY GLOBE VALVE. which when open offer no special impediment to the flow, andwhich close sufficiently tight to prevent circulation, althoughnot sufficient to prevent leaks. See page 131. 113. Piping for Indirect Heaters.—Indirect radiators havebeen described and methods of setting them illustrated in Article 69, page radiators are gen-erally set in a case or boxwhich is suspended fromthe basement ceiling andmade of matched boardslined with tin, Fig. sides of the casingshould be removable forrepair of the system of pipeswhich supply the indirectradiators are generallymost conveniently erect-ed, like those shown in Fig. 175 or 177 for steam-heating, andlike that shown in Fig. 179 for hot-water heating. The heatershould be located above the water-line of the boiler a sufficientdistance to afford ready means of draining off the water of con-densation. In case this is impossible, a style of radiator should. Fig. 136. — Indirect Surface. VARIOUS SYSTEMS OF PIPING. 22J be adopted which can be heated by water circulation. Anautomatic air-valve should be connected to the heater, and everymeans should be taken to obtain perfect circulation to and fromthe boiler. The chamber which surrounds the indirect surfaceis to be supplied with air from the outside by a properlyconstructed flue. The air passes up through or over theheater and into the rooms by means of special flues, the sizesof which are given in Chapter X. 114. Comparisons of Pipe Systems.—As to the best sys-tem of piping to be adopted little can be said in a general wayThe circuit-system, Fig. 173, no doubt gives the freest circula-tion and is applicable to either hot-water or steam heating. Insome respects it is simpler to construct, and it seems quiteprobable that small errors of alignment, minute obstructions,and error in proportioning the pipes would not be
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