Standard Practice for Locating Leaks in Sewer Pipes Using Electro-Scan--the Variation of Electric Current Flow Through the Pipe Wall
|Publication Date:||1 February 2006|
|ICS Code (External sewage systems):||93.030|
This practice covers procedures for using the electroscan method4 to detect and locate potential pipe leak defects that are potential sources of leaks in pipes fabricated from electrically nonconductive material such as plastic, clay, and concrete (reinforced and non-reinforced). The electro-scan method uses the variation of electric current flow through the pipe wall to locate defects that are potential water leakage paths either into or out of the pipe.
This practice applies to mainline and lateral gravity flow storm sewers, sanitary sewers, and combined sewers with diameters between 3 and 60 in. (75 and 1500 mm). The pipes must be free of obstructions that prevent the sonde passing through the pipe.
The use of the electro-scan requires access to sewers, filling sewers, and operations along roadways that are safety hazards. This standard does not describe the hazards likely to be encountered or the safety procedures that must be carried out when operating in these hazardous environments. (7.1.3) There are no safety hazards specifically associated with the use of an electro-scan apparatus that complies with the specifications provided in this standard. (6.7 and 6.10.)
The use of electro-scan requires the insertion of various items into a sewer. There is always a risk that due to unknown structural conditions in the sewer such items may become lodged in the pipe or may cause the state of a sewer in poor structural condition to further deteriorate. This standard does not describe methods to assess the structural risk of a sewer.
The values stated in inch/pound units are to be regarded as the standard. The values in parentheses are for information only.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.
4 The sole source of supply of the electro-scan methodapparatus known to the committee at this time is Metrotech Corporation. If you are aware of alternative manufacturers, please provide this information to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.