TM 10-4610-215-24TM 08580A-24/23-26. RAW WATER FLOWMETER.a. General.The RAW WATER FLOWMETER shows the rate which raw water IS entering the ROWPU. Thisparagraph describes test and inspection of the RAW WATER FLOWMETER.b. Removal. If necessary, remove raw water flowmeter assembly in accordance with paragraph 2-69.c. Test.CAUTION.Be sure to attach water source to inlet port of meter, which ismarked IN. Running water backwards, into the outlet port, candamage meter.NOTEPipe leading to meter inlet (IN) for test must be straight for atleast 20 inches (50 cm) before entering meter. Otherwise, testwill not be accurate.(1) Attach inlet port of meter to a straight pipe at least 20 inches (50 cm) long, leading to a metered watersource. The source must have an output range of 5 to 40 gpm (19 to 151 Ipm).NOTEIf no metered source is available, run the source into agraduated tank for 1 minute to determine exact flow rate.(2) Run water through meter at rate of 5 gpm (19 Ipm). If meter reading varies from flow rate by more than0.15 gpm (0.6 Ipm), discard meter.(3) Run water through meter at rate of 20 gpm (76 Ipm). If meter reading varies from flow rate by morethan 0.60 gpm (2.3 Ipm), discard meter.(4) Run water through meter at rate of 35 gpm (132 Ipm). If meter reading varies from flow rate by morethan 1 gpm (3.8 Ipm), discard meter.d. Inspection.(1) Inspect dial crystal for cracks or scratches.(2) Inspect dial face for legibility. Make sure needle can move freely.(3) During test, check meter body and dial for leaks.3-110
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