Mechanical Contracting & Plumbing January-December 1909 . which has been shown in detail in Fig. 4 shows a part of a circuit main;the heavy lines indicating a main thatis carried practically entirely overhead,forming a dry return, and the dottedline indicating how this part of themain which forms the return may bedropped down forming a wet return. Inthe former case the main should becarried very nearly its full size to apoint near the boiler where it connectsto the drop pipe forming the return ashere the pipe carries both steam, air. make and will generally be found un-necessary.
Mechanical Contracting & Plumbing January-December 1909 . which has been shown in detail in Fig. 4 shows a part of a circuit main;the heavy lines indicating a main thatis carried practically entirely overhead,forming a dry return, and the dottedline indicating how this part of themain which forms the return may bedropped down forming a wet return. Inthe former case the main should becarried very nearly its full size to apoint near the boiler where it connectsto the drop pipe forming the return ashere the pipe carries both steam, air. make and will generally be found un-necessary. Systems Illustrated. Fig. 2 shows an overhead basementcircuit main for a one-pipe low pressuregravity steam heating system. It iswith this type where there are no bleed-ers or drips used that the trouble spok- 7 and water, but in the latter case, at apoint below the water line of the boilerthe pipe may be considerably decreasedin size, as its only function is to carrythe water back to the boiler. Fig. 5 shows a drip or bleeder con-nection from a steam main to the re-turn, which it is frequently desirable tomake use of, particularly at a point PLUMBER AND STEAMFITTER January 15, 1909 Underground Insulation of Steam and Hot Water Pipes Address by Harry Gillett, Before a Convention of Steam Engineers at Toledo, Ohio, Recently. beyond where there is a considerablequantity of radiation attached to themain. By means of this connection,which is taken out of the bottom of themain it is relieved of all the waterfrom the steam through the variousra
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