(a) Notwithstanding the date the pipeline was installed or any earlier deadlines for compliance, each pipeline, which qualifies for use under this Part in accordance with section 255.14 of this Part, must meet the corrosion control requirements specifically applicable to pipelines installed before August 1, 1971, and all other applicable requirements within one year after the pipeline is readied for service. However, the corrosion control requirements specifically applicable to pipelines installed after July 31, 1971, apply if the pipeline substantially meets those requirements before it is readied for service or it is a segment which is replaced, relocated, or substantially altered.
(b) Onshore gathering lines. For any onshore gathering line under section 255.8 of this Part, that was not previously subject to this part, and for any onshore gathering line that becomes a regulated onshore gathering line under section 255.8, because of a change in class location or increase in dwelling density:
(1) the requirements of this subpart specifically applicable to pipelines installed before August 1, 1971, apply to the gathering line regardless of the date the pipeline was actually installed; and
(2) the requirements of this subpart specifically applicable to pipelines installed after July 31, 1971, apply only if the pipeline substantially meets those requirements.
(c) Regulated onshore gathering lines generally. Any gathering line that is subject to this subpart per section 255.8 of this Part at the time of construction must meet the requirements of this subpart applicable to pipelines installed after July 31, 1971.