MIL-HDBK-1164
Page
9.4.3
Sensor Maintenance....................................................147
9.4.4
Transmission System Maintenance .............................150
9.4.5
Indicator, Register, and
Recorder Maintenance ................................................150
9.4.5.1
Recorders ....................................................................150
9.4.5.2
Totalizers or Registers ................................................150
9.4.5.3
Combination Totalizer
Indicator-Recorder .......................................................154
9.4.6
Water Meter Maintenance ...........................................154
9.4.7
Weir and Flume Maintenance .....................................154
9.5
Safety ..........................................................................154
10.1
Cross-Connections and Backflow ................................157
10.2
References ..................................................................157
10.3
Classes of Backflow Hazards ......................................157
10.3.1
Class I--Low Degree of Hazard ..................................157
10.3.2
Class II--Moderate Degree of Hazard.........................158
10.3.3
Class III--High Degree of Hazard ...............................158
10.4
Approved Backflow Prevention Devices ......................158
10.4.1
Air Gap ........................................................................158
10.4.2
Vacuum Breakers ........................................................159
10.4.3
Reduced Pressure Principle Device ............................159
10.4.4
Double Check Valve Assembly....................................159
10.5
Selection and Installation
of Backflow Preventers ................................................159
10.6
Inspection and Testing Schedule ................................160
10.6.1
Inspection ....................................................................160
10.6.2
Testing .........................................................................161
10.7
Maintenance of Backflow Preventers ..........................161
10.8
Administrative Issues...................................................161
10.9
Records of Inspection ..................................................161
10.10
Location Records.........................................................161
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