Handbook for heating and ventilating engineers . y similar to E,having two copper diaphragms to take up the diaphragms flex over rings with curved edges andare thus protected somewhat against failure. / shows acopper U tube which is sometimes used. This is set in ahorizontal position and the expansion and contraction isabsorbed by bending the loop. In all these joints thosewhich depend upon the bending of the metal require littleattention except where complete rupture occurs. In oldplants, however, the rupturing of these diaphragms is offrequent occurrence. The packed joint requ
Handbook for heating and ventilating engineers . y similar to E,having two copper diaphragms to take up the diaphragms flex over rings with curved edges andare thus protected somewhat against failure. / shows acopper U tube which is sometimes used. This is set in ahorizontal position and the expansion and contraction isabsorbed by bending the loop. In all these joints thosewhich depend upon the bending of the metal require littleattention except where complete rupture occurs. In oldplants, however, the rupturing of these diaphragms is offrequent occurrence. The packed joint requires attentionfor packing several times in the year, but very seldomcauses trouble other than this. Anchors.—In any long run of pipe, where the expansionand contraction of the pipe causes it to shift its positionvery much, it is necessary to anchor the pipe at intervals soas to compel the movement toward certain desired anchor is sometimes combined with the expansion joint,in which case the conduit work is simplified. See Fig. COMBineo AncKoi tl «1 PAW SI ON JOIHT Fig. 110. 222 HEATING AND VENTILATION Service pipes to residences are taken off at or near theanchors. All condensation drains In steam mains are like-wise taken off at such points. Valves.—All valves on water systems should be straight-way gate valves. Valves on steam systems should be gatevalves on lines carrying condensation, and renewable seatglobe valves on the steam lines. Valves should be placed onthe main trunk at the power plant, on all the principalbranch mains as they leave the main trunk, on all by-passlines, on all the service mains to the houses, and at suchimportant points along the mains as will enable certainportions of the heating district to be shut off for repairswithout cutting out the entire district. Manholes.—Manholes are placed at important points alongthe line to enclose expansion joints and valves. These man-holes are built of brick or concrete and covered with Ironpl
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectventila, bookyear1913
