|
|
|
        |
Leak surveys are carried out by the use of a leak noise correlator. The correlator consists of a microprocessor, which is located in the van, as well as radio transmitters, which amplify and send the noise or vibration signals to the correlator. There are generally two types of sensors for the radio transmitters, accelerometers and hydrophones. Accelerometers are used for metallic pipe. They contact the pipeline and pick up the noise from the pipe wall. Hydrophones are used on non-metallic pipe and relay on sound transmission through water. Hydrophones must make contact with fluid in the pipe. The correlator's sensitivity, speed, and convenience make it a superior leak detection instrument. This maximizes operator skill and experience, and allows input of system variables. The leak detection system survey begins at one end of the system (or portion of the system) to be surveyed and proceeds section by section until completed. The sensors are placed at intervals determined in part by the pipe size and material, as well as the availability of access and pressure. Generally, the set-up length desired on a water distribution system is one city block. The Technician can correlate approximately four to five miles a day under normal working conditions. 25,000
LF MINIMUM START AT $.08 - $.05 PER LF |
 |
|
