MOUNTAINWEST PIPELINE, LLC — Integrity Assurance Notification

PRESSUREPursuant to the requirements in 49 CFR part 192.153(e)(4)(ii), this letter is a notice of a temporary pressure vessel that needs to remain installed on the pipeline system for longer than 30 days. MountainWest Pipeline, OPID No. 12874, installed a temporary filter separator on its ML041 pipeline to aid in an in-line inspection using an MFL tool of the line. The separator was installed and inspected per regulation on July 12, 2022. Due to some data loss on the run, the MFL tool, including additional cleaning pigs, needs to be run again. This necessitates that the temporary filter separator remains installed until the conclusion and acceptance of the additional tool run.#