# HAR 6-77-160 Change in class location: required study

- **operation:** document
- **citation:** HAR 6-77-160
- **title:** HAR 6-77-160 Change in class location: required study
- **source type:** regulation
- **agency:** Hawaii Public Utilities Commission
- **status:** current
- **official:** true
- **published on:** 1994-04-15
- **effective on:** 1994-09-03
- **summary:** population density indicates a change in class location for a segment of an existing steel pipeline operating at hoop stress that is more than forty percent of SMYS; or indicates that the hoop stress corresponding to the established maximum allowable operating pressure for a segment of existing pipe
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- **source url:** https://puc.hawaii.gov/wp-content/uploads/2026/04/HAR-6-77-Transp-of-Gas-03-31-2026.pdf
**body:**

population density indicates a change in class location for a segment of an existing steel pipeline operating at hoop stress that is more than forty percent of SMYS; or indicates 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: (1) The present class location for the segment involved; (2) 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 chapter; (3) The physical condition of the segment of the extent it can be ascertained from available records; (4) The operating and maintenance history of the segment; (5) The maximum actual operating pressure and the corresponding hoop stress, taking pressure gradient into account, for the segment of pipeline involved; and (6) 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. [Eff ] (Auth: HRS '269-6) (Imp: 49 C.F.R. '192.609, October 1, 1990)
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