Greenhouses, their construction and equipment . Fig. 99.—A corner coil. It allows for expansion of thepipes 192 GREENHOUSES flows back to the boiler through the supplypipe. In this case all pipes have an upwardslope from the boiler, with no sags or pock-ets in which the water can collect. Thismethod, sometimes known as the single pipesystem, is very commonly used in heatingdwellings where the pipes are mostly verti-. Fig. 100.—A mortise coil designed to allow for expan-sion of pipes cal, but in greenhouses having long, nearlyhorizontal coils there is likely to be muchhammering in the pipes, ca
Greenhouses, their construction and equipment . Fig. 99.—A corner coil. It allows for expansion of thepipes 192 GREENHOUSES flows back to the boiler through the supplypipe. In this case all pipes have an upwardslope from the boiler, with no sags or pock-ets in which the water can collect. Thismethod, sometimes known as the single pipesystem, is very commonly used in heatingdwellings where the pipes are mostly verti-. Fig. 100.—A mortise coil designed to allow for expan-sion of pipes cal, but in greenhouses having long, nearlyhorizontal coils there is likely to be muchhammering in the pipes, caused by the in-terference of the steam with the returnwater. A more satisfactory method for green-house heating is to arrange the pipes muchthe same as in hot-water heating, pro-portioning the size to the supply and re- STEAM INSTALLATION 193 turn pipes according to directions given ina following paragraph. This is known asthe two-pipe system. The return pipe en-ters the boiler below the surface of the coils should have a fall toward the boilerof about I inch to 20 feet. It is not wiseto use the straight coils commonly used forhot water in steam heating as they do notallow for the unequal expansion of the pipeswhen the steam is turned on quickly. Insteam heating special form of coils are com-monly used among which are the corner coiland mortise coil. Size of Supply and Return Pipes.—Theo-retical
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