Mariner East pipelines

The Mariner East pipelines are a series of Natural Gas Liquids pipelines under construction in the US state of Pennsylvania. The pipelines are intended to facilitate the transfer of Natural Gas Liquids from the Utica Shale and Marcellus Shale Formations to ports on the eastern seaboard where the ethane, butane, pentane, propane mix will be shipped to Scotland for plastics production. The construction of the pipelines generated considerable controversy inside Pennsylvania.[1] Construction on the pipelines, dubbed Mariner East 1, 2 , and 2X, is being undertaken by Sunoco Logistics.[2]

Mariner East pipeline system
Part of Mariner East II in Delaware County, Pennsylvania.
Location
CountryPennsylvania, United States
General directionEast-West
ToMarcus Hook, Pennsylvania
General information
OwnerSunoco Logistics Partners
Commissioned2015
Technical information
Length350 mi (560 km)
Diameter8 in (203 mm)

Pipelines

Mariner East 1

Mariner East 1 was originally built as a gasoline pipeline in the 1930s. The conversion of the gasoline pipeline into a NGL- compatible pipeline was completed in 2015. In March 2018 portions of the pipeline were temporarily shut down by the State of Pennsylvania after the pipeline was suspected of causing sinkholes in West Whiteland Township.[3]

Mariner East 2

Mariner East 2 is a new pipeline under construction in Pennsylvania that is intended to supplement Mariner East 1's ability to move natural gas liquids from Western Pennsylvania to a refinery in Marcus Hook, Delaware County.[2] Combined with Mariner East 1, the 8-inch pipeline will carry 345,000 barrels of natural gas liquids per day.[1][4]

Construction

The Mariner East 2 pipeline was constructed using horizontal directional drilling, a process which has been noted for its relatively minimal impact on surface topsoil.[5] However Sunoco has been issued over 12.6 Million dollars in fines from the PA Dept. of Environmental Protection, who has twice halted completion of the project in less than a year for violations. In March 2018 the Pennsylvania Public Utility Commission halted construction when the experimental horizontal directional drilling ruptured a fault line and created sinkholes in a suburban neighborhood.

Outright construction on Mariner East 2 began in February 2017 at a projected cost of $2.5 billion, though a number of delays extended the construction timetable by 18 months.[2] Said delays included issues with permitting, extensive litigation with landowners on whose land the pipeline traverses, opposition from environmental groups, and instances of accidental pollution.[2] Construction was halted between the beginning of January and early February 2018 after horizontal drilling resulted in the pollution of well water. A $12.6 million dollar civil penalty was also issued to Sunoco by the State of Pennsylvania.[6]

In early April 2018 machines being used to construct the pipeline were vandalized at a construction site in West Whiteland Township. Both Sunoco and an environmentalist group blamed each other for the sabotage, and both offered a $10,000 reward for information about the vandalism.[7] In mid April 2018 Sunoco announced that it would consider switching from using horizontal direction drilling to more traditional bore hole drilling at construction sites in West Whiteland Township. This decision came in the wake of concerns about HDD drilling affecting local aquifers and wells.[8] Local residents and legislators are vehemently opposed to the switch in drilling method as this would have the highly volatile gases 4 feet from surface through questionable and unstable geology in densely populated areas.

As of October 2018 the pipeline is to finish by 2019. [1]

Mariner East 2X

Mariner East 2X is a 16-inch pipeline envisioned to run parallel to the Mariner East 2 pipeline. It is expected to be finished in 2019, after which it will carry 250,000 barrels of NGL per day.[1]

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References
  1. "DEP fines Sunoco's Mariner East pipeline $12.6 million but allows work to resume". Pittsburgh Post-Gazette. Retrieved 2018-04-14.
  2. "Mariner East: A pipeline project plagued by mishaps and delays". StateImpact Pennsylvania. Retrieved 2018-04-14.
  3. "PUC shuts down Mariner East 1 pipeline, citing public safety concerns raised by sinkholes". StateImpact Pennsylvania. Retrieved 2018-04-14.
  4. https://www.dep.pa.gov/Business/ProgramIntegration/Pennsylvania-Pipeline-Portal/Pages/Mariner-East-II.aspx
  5. "Home - Sunoco Logistics Pipeline Projects". Mariner Pipeline Facts. Retrieved 2018-04-14.
  6. "Sunoco can resume Mariner East 2 drilling at Chester County site, DEP says". StateImpact Pennsylvania. Retrieved 2018-04-14.
  7. "Pipeline opponents offer their own $10k reward for information on Mariner East vandalism". StateImpact Pennsylvania. Retrieved 2018-04-14.
  8. "Sunoco proposes changes to Mariner East 2 construction in Chester County; DEP sets public hearing". StateImpact Pennsylvania. Retrieved 2018-04-18.
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