. Principles and practice of plumbing . es at lowerlevels, as would be the case ifthe gate valve and tide watertrap were placed in the maindrain or near the main draintrap. A tide water or back-water trap has already beenshown, and in Fig. 17 isshown a combination house-drain and tide-water trap with the side of the trap partlybroken away and a cover removed to show the interior. Floor Drains.—In breweries, stables, washrooms, bot-tling establishments, hotel kitchens or other places wheresufficient water is poured or splashed on the floor to main-tain the seal of a trap, floordrains are permis
. Principles and practice of plumbing . es at lowerlevels, as would be the case ifthe gate valve and tide watertrap were placed in the maindrain or near the main draintrap. A tide water or back-water trap has already beenshown, and in Fig. 17 isshown a combination house-drain and tide-water trap with the side of the trap partlybroken away and a cover removed to show the interior. Floor Drains.—In breweries, stables, washrooms, bot-tling establishments, hotel kitchens or other places wheresufficient water is poured or splashed on the floor to main-tain the seal of a trap, floordrains are permissible. A floordrain is shown in Fig. 18. Thesefixtures should be provided withheavy brass or iron removablestrainers and water seal and,when subject to tide or storm-water floods, a tide water drains should never beused in cellars or basements ofbuildings unless they are pretty sure to be kept sealed with water; even then they are ob-jectionable, and, if used, should be provided with a tide Fig. 17Sewer and Tide Water Trap. Fig. 18Floor Drain Digitized by Microsoft® Principles and Practice of Plumbing 27 water trap to prevent an overflow of sewage should themain drain become stopped up. A deep seal trap is desir-able for a floor drain. With a deep seal, the water is notso liable to be lost by evaporation, and the seal destroyed,provided it is re-charged at least once a year. Hot, dry airis seldom found in cellar or basement, and without dry air,little evaporation will take place. Floor drains with water connections are sometimesrequired in hospitals, morgues, operating rooms and likeplaces. The valve controling the water is located at thewall at a convenient height and place. Digitized by Microsoft® 28 Principles and Practice of Plumbing CHAPTER IVPROPORTIONING THE DRAINAGE SYSTEM Velocity of Flow in Drains.—Street sewers and longhouse sewers should be given such an inclination that thesewage will have a velocity of from 180 to 360 feet per min-ute. With a velo
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