. Principles and practice of plumbing . bjects thatmight interfere with the operation ofthe meter. Some meters have a strain-er covering the inlet and forming partof the meter. Such a strainer is shownat b, in Fig. 73. When a strainer doesnot form part of the meter, a separatestrainer or fish trap should be used. Inlocalities where the water is extremelydirty or carries large quantities of mat-ter in suspension, a strainer. Fig. 74,formed of hinged brass strips, will befound more satisfactory than a perfor-ated strainer, Fig. 75, owing to the ease with which thehinge strainer can be removed an
. Principles and practice of plumbing . bjects thatmight interfere with the operation ofthe meter. Some meters have a strain-er covering the inlet and forming partof the meter. Such a strainer is shownat b, in Fig. 73. When a strainer doesnot form part of the meter, a separatestrainer or fish trap should be used. Inlocalities where the water is extremelydirty or carries large quantities of mat-ter in suspension, a strainer. Fig. 74,formed of hinged brass strips, will befound more satisfactory than a perfor-ated strainer, Fig. 75, owing to the ease with which thehinge strainer can be removed and cleaned. Water meters should be located in an accessible placesafe from frost. Where there is danger of hot water beingforced backward through a meter a check valve should beplaced in the supply pipe to protect the indurated rubberparts from being damaged by the hot water. Special water meters, the working parts of which aremade of bronze metal, are made for metering hot tube meters have no parts that can be affected by. //7/tf/ Fig. 72Velocity Meter Digitized by Microsoft® 150 Principles and Practice of Plumbing
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