. Principles and practice of plumbing . Fig. loSStantlarcl Ball Joint Digitized by Microsoft® 348 Principles and Practice of Plumbing take care of any reasonable settlement, shrinkage, or othermovement of the piping or building. This flange, like theBall-joint, is made tight at the factory, and tested beforebeing sent out, which ought to be required of any flangebefore specifying. If the maker is not willing to stand backof his goods for five years, the specifying architects cannotbe expected to have much confidence in it. Flush Tanks.—Water closets should always be flushedwith water from flus
. Principles and practice of plumbing . Fig. loSStantlarcl Ball Joint Digitized by Microsoft® 348 Principles and Practice of Plumbing take care of any reasonable settlement, shrinkage, or othermovement of the piping or building. This flange, like theBall-joint, is made tight at the factory, and tested beforebeing sent out, which ought to be required of any flangebefore specifying. If the maker is not willing to stand backof his goods for five years, the specifying architects cannotbe expected to have much confidence in it. Flush Tanks.—Water closets should always be flushedwith water from flush tanks, or through specially con-structed flush valves. There are two reasons for theserequirements: First, the flush pipe or flush valve will be of Base of^C/ase/\. Fig. 159lletal-to-Metal Floor Flange sufficient size to supply a large volume of water in a shortperiod of time, thus insuring a good flush; second, the tankcan be proportioned or the flush valve regulated to furnisha certain quantity of water at each flush. Flush tanks are made with capacities ranging from 6to 12 gallons. In large city apartment houses, hotels andlike buildings, where a considerable volume of water is gen-erally flowing through the house drain, tanks of smallercapacity may be used than would be required in privatehouses or in large country institutions which are located aconsiderable distance from a trunk sewer or other place of Digitized by Microsoft® Principles and Practice of Plumbing 349 sewage disposal. The reason for this is that in large citybuildings if a sufficient volume of water is provided incloset tank or flush valve to discharge the contents of acloset into the soil stack, it will fall by gravity to the housedrain, where assisted by the flowing water i
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