Pushing back against concerns raised by project opponents, Mountain Valley Pipeline LLC (MVP) said its handling of a recent failed pressure test demonstrates that safety protocols are working as intended.

In a letter filed with FERC late last week, Todd L. Normane, senior vice president for MVP backer Equitrans Midstream Corp. and legal counsel for the pipeline, said the company felt compelled to respond to “the recent spate of public misinformation” surrounding a May 1 rupture that occurred during hydrostatic testing.

Following years of delays, MVP resumed construction on the 303-mile, 2 million Dth/d Appalachia-to-Southeast natural gas pipeline last summer after Congress intervened to rescue the project from regulatory limbo. The developer had previously told the Federal...