Cyclopedia of heating, plumbing and sanitation; a complete reference work . Fig, it). KisiTs Drained i Mam and MainDrained at End. monly drained as shown in Fig. ID, connections being taken fromthe bottom of the main and the heel of the riser. Risers are not in-frequently drained to the main, which in turn is drained at the end(see Fig. 26). This arrangement requires Less fitting than when the Equalizing Pipe Over Flow Artificial Water Stand Pipe Line Main Return o= ^ Fig. 27. Showing Artificial Water risers are relieved at the base, as shown in Fig. 20. If the mainsare long, they shoul
Cyclopedia of heating, plumbing and sanitation; a complete reference work . Fig, it). KisiTs Drained i Mam and MainDrained at End. monly drained as shown in Fig. ID, connections being taken fromthe bottom of the main and the heel of the riser. Risers are not in-frequently drained to the main, which in turn is drained at the end(see Fig. 26). This arrangement requires Less fitting than when the Equalizing Pipe Over Flow Artificial Water Stand Pipe Line Main Return o= ^ Fig. 27. Showing Artificial Water risers are relieved at the base, as shown in Fig. 20. If the mainsare long, they should l>e dripped at intervals of 50 to 75 feet. Overhead-feed mains on a down-feed system are nearly alwaysdripped from the bottom to the various risers, as previously stated. Artificial Water Line. It is sometimes necessary, when a boiler 2-ii STEAM AND HOT WATER FITTING 21. is set very low with reference to the returns, and it is desired to use awet return system, to seal the relief pipes by means of an artificialwater line established as shown in Fig. 27. The equalizing pipe is tobe connected with a steam main. When the discharge from the system leads to an open return, atrap mus* be used. One of the type shown in Fig. 28, -a rWP^h arranged with an equalizingpipe and set at the properlevel, will hold the waterline in the system, no stand-pipe being required. Pipe Sizes. — capacities of pipes tosupply heating surface in-crease more rapidly thantheir sectional areas; thatis, a 6-inch pipe, with aboutfour times the area of a 3-inch pipe, will supply nearly six times as much surface. Table III shows the amounts of radiating surface in gravity-return systems which main pipes 100 feet long, of different diameters,may be safely counted on to supply with low-pressure steam (say, 3 to5 lbs.). In case the radiating surface is located some distance abo
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