# 255.609 Change in class location: required study.

- **operation:** document
- **citation:** 16 NYCRR 255.609
- **title:** 255.609 Change in class location: required study.
- **source type:** regulation
- **agency:** New York State Public Service Commission
- **status:** current
- **official:** true
- **published on:** Not available
- **effective on:** Not available
- **summary:** Transmission and Distribution of Gas. At least once every five years or whenever an increase in population density indicates either a change in class location for a segment of an existing steel pipeline operating at a hoop stress that is more than 40 percent of SMYS, or that the hoop stress corresponding to the established maximum allowable operating pressure for a segment of existing pipeline i
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**body:**

At least once every five years or whenever an increase in population density indicates either a change in class location for a segment of an existing steel pipeline operating at a hoop stress that is more than 40 percent of SMYS, or that the hoop stress corresponding to the established maximum allowable operating pressure for a segment of existing pipeline is not commensurate with the present class location, the operator shall immediately make a study to determine:

(a) the present class location for the segment involved;

(b) the design, construction, and testing procedures followed in the original construction, and a comparison of these procedures with those required for the present class location by the applicable provisions of this Part;

(c) the physical condition of the segment to the extent it can be ascertained from available records;

(d) the operating and maintenance history of the segment;

(e) the maximum actual operating pressure and the corresponding operating hoop stress, taking pressure gradient into account, for the segment of pipeline involved; and

(f) the actual area affected by the population density increase, and physical barriers or other factors which may limit further expansion of the more densely populated area.
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