Heating and ventilating buildings : a manual for heating engineers and architects . Fig. 35.—Radiating Surface and Pan for Holding Water to moisten brackets are usually used where two or more lengths of pipe are run in parallel lines with a slight descent in the direction of the flow, and thusserve both for radiating surfaceand circulating pipes. For green-house heating, where the air is tobe kept moist, a special pan tobe filled with water, as shown inFig. 35, supported by the pipes,is used at intervals. For the purpose of checkingor stopping the flow a stop con-sisting of a flat
Heating and ventilating buildings : a manual for heating engineers and architects . Fig. 35.—Radiating Surface and Pan for Holding Water to moisten brackets are usually used where two or more lengths of pipe are run in parallel lines with a slight descent in the direction of the flow, and thusserve both for radiating surfaceand circulating pipes. For green-house heating, where the air is tobe kept moist, a special pan tobe filled with water, as shown inFig. 35, supported by the pipes,is used at intervals. For the purpose of checkingor stopping the flow a stop con-sisting of a flat plate, which canbe set at any angle with the pipe, and of a form as in Fig. 36, is used. Each length of cast-. 36.—Valve or Stop forCast-iron Pipe. PIPE AND FITTINGS. I iO, iron pipe is sometimes provided with flanges, and jointsarc made by bolting the pipes together, packing being in-serted to prevent leaks. These are inferior to the calkedjoints. 58. Wrought-iron and Steel Pipe.—Pipe made of wroughtiron or mild steel is generally used for the purposes of convey-ing steam or hot water in heating systems. This pipe is madein a number of factories and of standard sizes, so that thepipe obtained from one is reasonably certain to fit that fromanother. Wrought-iron or steel pipe is made from metalof the proper thickness, which is rolled into pipe shape, andraised to a welding heat, after which the edges are weldedby drawing through a die. The smaller sizes, ij inch andunder, are butt-welded; the larger sizes are in all cases lap-welded.* This pipe is put on the market in three different grades ofthickness: first the standard grade, which is used principallyfor heating purposes ; this is
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