scope:

This Standard sets forth methods of electrical coordination between pipelines and alternating current (ac) supply lines* having line-to-line voltages greater than 60 kV that are simultaneously or separately installed as follows:

a) a pipeline located on a power line right-of-way or a power line located on a pipeline right-of-way;

b) a pipeline right-of-way located parallel to a power line right-of-way, or vice versa, where the adjacent right-of-way boundaries are within 300 m of each other; and

c) laterals and extensions to the pipelines described in Item (a) or (b).

* Referred to in this Standard as power lines.

Notes:

1) Power lines operating at voltages lower than 60 kV can, in some situations, induce significant voltages on parallel pipelines.

2) The contribution of the third harmonic to induction on pipelines has been observed in some situations. Industry understanding of the impact on pipeline induction from harmonics on the electric transmission system is not mature at this time; material on the subject will be considered in a future update to this Standard.

3) Induction on pipelines is influenced by factors in addition to the distance between parallel power lines and pipelines, e.g., the length of the parallelism and the power line current. Based on engineering analysis, it can be necessary for the parties involved to apply the principles and practices outlined in this Standard in situations where parallel rights-of-way are separated by more than the distance specified in Clause 1.1(b), e.g., in cases of parallels longer than 5 km.