PHMSA Gas Transmission (GT) Integrity Management
Time: 12/21/2014 08:47 PM

Protocol Item A.04

A.04 Identification Using Class Locations (Method 1)

If the operator's integrity management program relies on 192.903 High Consequence Area definition (1) for identification of high consequence areas, verify compliance with the following:

  1. Verify the integrity management program includes Class 3 and Class 4 piping locations as high consequence areas consistent with the criteria of 192.5(b)(3), 192.5(b)(4), and 192.5(c). [192.903 High Consequence Area (1)(i) and (ii)]

  1. For Class 1 and Class 2 locations with the potential impact radius greater than 660 feet, verify the integrity management program includes piping locations as high consequence areas if the area within the associated potential impact circle contains 20 or more buildings intended for human occupancy.[192.903 High Consequence Area (1)(iii)]
    1. As an option for PIRs greater than 660 feet, the definition of high consequence area may be based on a prorated building count for buildings intended for human occupancy within a distance of 660 feet (200 meters) from the centerline of the pipeline as calculated using the following formula: [192.903 High Consequence Area (4)]
    Building Count within 660 feet = 20 x [660 (ft) /PIR (ft)]2 or
    Building Count within 200 meters = 20 x [200 (m) / PIR (m)]2
      1. If the option for use of a prorated number of buildings has been used for identification of high consequence areas, verify that the program acknowledges that use of the prorated allowance is only available to operators until December 17, 2006. [192.903 High Consequence Area (4)]
  1. Verify the program includes as a high consequence area, any area in Class 1 and Class 2 piping locations where the potential impact circle contains an identified site. [192.903 High Consequence Area (1)(iv)]

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