Page 14 - ETRN 2019 Interim CSR Report test
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maintenance event at 27,000 hours. The              Identification of Remaining High-Bleed
              increase in unit availability and the reduction     Pneumatic Controllers
              in emissions from this single effort highlighted
                                                                  ETRN anticipates identifying and potentially
              the importance of analyzing ETRN’s work
                                                                  replacing any remaining high-bleed
              management system for similar opportunities.
                                                                  pneumatic controllers. Each possible
                                                                  replacement will be screened for economic
              Future Mitigation Methods
                                                                  and technical feasibility.
              ETRN is also evaluating several potential GHG
              mitigation efforts, some of which include:          Recompression of Pipeline Gas
                                                                  Prior to Blowdown
              Expansion of LDAR Program
                                                                  New portable technology, known as “ZeVac,”
              At compressor station facilities, a Leak            is available to compress gas from pipelines
              Detection and Repair (LDAR) program is used         to nearby lower-pressure pipelines prior to
              to identify leaks from valves, mechanical           pipeline blowdown for maintenance and
              joints, compressors, etc. Once a leak is            other procedures. ETRN is evaluating the
              identified, it is repaired within a designated      economic and technical feasibility to utilize
              timeframe and the required documentation            the ZeVac equipment for future activities.
              is maintained.
                                                                  Flaring of Pipeline Gas
              Based on regulatory or permit requirements,
                                                                  ETRN will evaluate the economic and
              LDAR is required at many, but not all, of ETRN’s
                                                                  technical feasibility of flaring pipeline gas,
              compressor stations and dehydration facilities.
                                                                  rather than utilizing a blowdown, during
              In 2019, ETRN took steps to go beyond
                                                                  pipeline maintenance events. Although
              compliance requirements by implementing
                                                                  this practice would reduce the methane
              LDAR programs for compressor stations that
                                                                  emissions by as much as 99%, other
              were not subject to the program through a
                                                                  air pollutants would be emitted due to
              permit or regulatory requirement.
                                                                  combustion. Such an activity would need to
                                                                  be assessed for permitting applicability and/
              Pneumatic Controller Upgrades
                                                                  or other regulatory impacts.
              Select vendors now provide “no bleed” or
              “very low bleed” pneumatic controllers.             Upgrading Existing Stations with
              While the “no bleed” controllers do bleed           Air or Electric Starts
              some gas while actuating, ETRN is working
                                                                  Although newer compressor stations are
              to determine proper emissions reporting for
                                                                  equipped with air or electric systems to
              such controllers. We are selecting two sites
                                                                  start engines, many of our older stations
              at which to install these controllers in order
                                                                  and assets utilize gas to start equipment.
              to evaluate their cost, emissions savings, and
                                                                  ETRN will conduct an economic and
              technical feasibility.
                                                                  technical feasibility evaluation, by location,
                                                                  to determine which stations, if any, will be
                                                                  upgraded with air or electric engine starts.



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