. Railway and Locomotive Engineering . ffe-F Willi l;l.\i, ()\Kr). IroliaMy e\ery engineer has had ex-perience with the irresislilile strains inpipe lines caused by expansion and con-traction. Loose, leaky fittings and per-haps here and there a fractured jointpoint conclusively to the necessity forsome device having sufficient flexibilityto absorb these changes in length. Tlieengineer also knows that the amount ofchange in pi])e length depends upon twofactors—the length of the pipe and thedifTerence in temperature. Although old-fashioned bends andlong sweeps and loops are useful in
. Railway and Locomotive Engineering . ffe-F Willi l;l.\i, ()\Kr). IroliaMy e\ery engineer has had ex-perience with the irresislilile strains inpipe lines caused by expansion and con-traction. Loose, leaky fittings and per-haps here and there a fractured jointpoint conclusively to the necessity forsome device having sufficient flexibilityto absorb these changes in length. Tlieengineer also knows that the amount ofchange in pi])e length depends upon twofactors—the length of the pipe and thedifTerence in temperature. Although old-fashioned bends andlong sweeps and loops are useful in mak-ing changes in direction and have beenused quite extensively for taking care ofchanges in length, they are not beautifuland they take up considerable valuablespace; also cracks are liable to developunder repeated temperature slip joint has the one disadvantageof requiring frequent packing. The Badger joint combines the elas-ticity to stand repeated changes of shape. ers is adopted l)ccausc of its strengthand llcxibility. Hut a single piece ofcopper would have to be very thick forhigh pressures, and in actual practice itis found that there is always a tendencyfor one or two corrugations to take theentire strain of repeated change inshape. In time those few corrugationstaking all tlie work would give out. External rings on the corrugations ofthe Badger joint distribute the strainsamong several corrugations, and by thusbringing many corrugations into serviceno one of tliem is called upon to takemore than its share of the work. Theexterna! rings force a part of the strainto the next corrugation, and as eachcorrugation has but slight movement, thejoint lasts almost indelinitely. The rings give added strength to thejoint in the same that spiral windingof a pipe with win .idds to its strength. The number of corrugations dependupon the pressure aiul upon the lengthof the joint. Eor liigb pressures and su-
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyork, bookyear19
