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How To Design And Install Plumbing
Bidet. The bidet is a form of bath used in hospitals to wash the lower extremities of the body. The fixture is shown in Fig. 271 and operates in the following manner. The patient fills the fixture with water to a satisfactory level. In older fixtures this was done by a water supply inlet connected to the bottom of the fixture basin. The inlet was completely submerged and the content of the bidet could be drained or siphoned into the water supply system.
Bidets of recent design have the filling spout located above the overflow rim, thus eliminating all possibility of cross-connection.
Aspirators. An aspirator, Fig. 272, is a device used in connection with dentistry and similar medical operations. In dentistry, it is used to convey saliva from the mouth and drain it to a waste terminal. The vacuum is created by a flow of water passing an orifice that is associated with the tube leading to the patient's mouth. Direct connection with the water supply and the waste makes this installation an objectionable one.
Fig. 273 represents the proper manner of connecting this unit to the plumbing system. Arresters are used to prevent saliva from being drawn back into the water supply. The waste must be dripped as the illustration indicates.
Commercial Appliances. There are many commercial appliances which may become cross-connections unless the individual who installs them uses good judgment in devising the piping layout. Under this head such devices as condensers, filters, water softeners, pumps, refuse cookers in slaughter houses, laundry equipment and so on may be catalogued. To go into specific detail with respect to each of these units would require many pages, and space does not permit such an extensive analysis. There are, however, a few precautions appropriate to all installations and these are to be rigidly observed.
The water supply to these units should be a pure and wholesome one and should be administered to the device from a source which does not come in direct contact with its content. It may be fed into the unit above its overflow rim, or pumped from an open surge tank that is provided with an over-rim filler.
The waste connection must always be of the dripped variety, indirectly connected to the waste disposal system. As an added protection the installation must be equipped with approved siphon breakers and check valves to give added protection.
