Cyclopedia of heating, plumbing and sanitation; a complete reference work . or a check-valve, to prevent thesteam from short-circuiting and holding back the condensation in thereturns above. If an overhead supply is used, the arrangementshould be the reverse; that is, all return connections should be sealedexcept the lowest. Sometimes a separate drip is carried down from each set ofradiators, as shown on the lower story, being connected with themain return below the water-line of theboiler. In case this is done, it is well toprovide a check-valve in each drip belowthe water-line. In buildings
Cyclopedia of heating, plumbing and sanitation; a complete reference work . or a check-valve, to prevent thesteam from short-circuiting and holding back the condensation in thereturns above. If an overhead supply is used, the arrangementshould be the reverse; that is, all return connections should be sealedexcept the lowest. Sometimes a separate drip is carried down from each set ofradiators, as shown on the lower story, being connected with themain return below the water-line of theboiler. In case this is done, it is well toprovide a check-valve in each drip belowthe water-line. In buildings of any considerable size,it is well to divide the piping system intosections by means of valves placed in thecorresponding supply and return are for use in case of a break inany part of the system, so that it will benecessary to shut off only a small part ofthe heating system during repairs. In tall buildings, it is customaryto place valves at the top and bottom of each riser, for the samepurpose. Radiator Connections. Figs. 30, 31, and 32 show the common. Fig. 32. One-Pipe Connectionof Radiator to Riser. 65 56 HEATING AND VENTILATION methods of making connections between supply pipes and 30 shows a two-pipe connection with a riser; the return is carrieddown tn the main below. Fig. 31 shows a single-pipe connectionwith a basement main; and Fig. 32, a single connection with a must always be taken t make the horizontal part of thepiping between the radiator and riser as short as possible, and to give it a g 1 pitch toward the riser. There are various ways of making these connections, especially suited to different conditions; bul theexamples given serve to show the general principle to be followed. 20, 21. and 22 show the common methods of making steamami return connections with circulation coils. The position of theair-\ alve is shown in each c Expansion of Pipes. Cold steam pipes expand approximately Q r Q B Elevation and Plan f
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