Welling Compressor Station Air Permit Renewed for Five Years

Compressor stations are used to move oil and gas products to market through pipelines. They are one of the major sources of air pollution along the Marcellus Shale gas supply chain.

In the early years of Marcellus Shale development, most of the compressor stations being constructed were smaller ones, with horsepower ratings totaling around 6,000 to 8,000 horsepower each. In subsequent years, we began seeing much larger compressor stations with total horsepower ratings closer to 20,000 horsepower each, as well as multiple compressor stations in close proximity to one another.
While most compressor stations are powered by natural gas, some have been required to add electric compressors in their final expansion phases, to reduce localized air pollution. One example of that would be the Welling Compressor Station in Washington County, Pennsylvania, addressed in an earlier blog here. Here’s a look at the history:
PENNSYLVANIA BULLETIN – January 1, 2011
Intent to Issue Plan Approvals and Intent to Issue or Amend Operating Permits under the Air Pollution Control Act and 25 Pa. Code Chapter 127, Subchapter B. These actions may include the administrative amendments of an associated operating permit.

Southwest Region: Air Quality Program, 400 Waterfront Drive, Pittsburgh, PA 15222-4745
Contact: B. Hatch, Environmental Engineer Managers—Telephone: 412-442-4163/5226

63-00958: MarkWest Liberty Midstream and Resources, LLC (1515 Arapahoe Street Tower 2, Suite 700, Denver, CO 80202-2126) to allow the installation and initial temporary operation of four (4) new natural gas-fired compressor engines rated at 1980 bhp each and a new natural gas-fired dehydrator re-boiler rated at 2.0 MMBtu/hr at their Welling Compressor Station in Buffalo Township, Washington County.

In accordance with 25 Pa. Code §§ 127.44—46 the Department of Environmental Protection (DEP) intends to issue Air Quality Plan Approval: PA-63-00958 to allow the installation and initial temporary operation of four new natural gas-fired compressor engines rated at 1980 bhp each and a new natural gas-fired dehydrator re-boiler rated at 2.0 MMBtu/hr at the Welling Compressor Station located in Buffalo Township, Washington County. Two currently authorized natural gas-fired compressor engines rated at 1380 bhp each, one dehydrator (including reboiler) rated for 100 mmscf/day of natural gas, one gunbarrel separation tanks with a capacity of 500 bbl, three condensate tanks with a capacity of 400 bbl each, and one saltwater tank with a capacity of 400 bbl have previously been authorized for installation under GP5-63-00958 and will be incorporated into this plan approval for a total of six engines, one dehydrator, one separation tank, three condensate tanks, and one saltwater tank.

Potential emissions from the facility are estimated to be 34.79 tons of nitrogen oxides (NOx), 24.17 tons of carbon monoxide (CO), 24.25 tons of volatile organic compounds (VOC), 2.17 tons of formaldehyde, and 4.38 tons of hazardous air pollutants (HAP) per year. The plan approval will include federally enforceable emission limits on the engines for NOx, CO, and VOC. Best available technology (BAT) for the proposed sources is combusting natural gas, rich burn combustion for each engine controlled by three-way catalysts, good combustion practices including the use of air to fuel ratio controllers and proper maintenance and operation. The authorization is subject to State regulations, Federal New Source Performance Standards (NSPS) including 40 CFR Part 60, Subpart JJJJ for spark ignition internal combustion engines, and Federal National Emission Standards for Hazardous Air Pollutants (NESHAPS) including 40 CFR Part 63, Subpart HH for oil and natural gas production facilities. Federal requirements for Mandatory Greenhouse Gas Reporting from 40 CFR Part 98 have also been included in this Plan Approval. Compliance with emission limitations will be demonstrated through stack testing. Plan Approval has been conditioned to ensure compliance with all applicable rules. Once compliance with the Plan Approval is demonstrated, the applicant will subsequently apply for a State Only Operating Permit in accordance with Pa. Code Title 25 Subchapter F.

Those who wish to provide the Department with additional written information that they believe should be considered prior to the issuance of the Plan Approval may submit the information to Alan Binder, Pennsylvania Department of Environmental Protection, 400 Waterfront Drive, Pittsburgh, PA, 15222. Each written comment must contain the following:

  • Name, address and telephone number of the person submitting the comments.
  • Identification of the proposed Plan Approval (PA-63-00958).
  • Concise statements regarding the relevancy of the information or objections to issuance of the Plan Approval.
  • All comments must be received prior to the close of business 30 days after the date of this publication.
  • For additional information you may contact Alan Binder at 412-442-4168. (Source)
Farmland to Gasland
PENNSYLVANIA BULLETIN – July 2, 2022
Intent to Issue Operating Permits under the Air Pollution Control Act (35 P.S. §§ 4001—4015) and 25 Pa. Code Chapter 127, Subchapter F.

Southwest Region: Air Quality Program, 400 Waterfront Drive, Pittsburgh, PA 15222-4745.
Contact: Thomas Joseph, P.E., Facilities Permitting Chief, (412) 442-4336.

63-00958: MarkWest Liberty Midstream & Resources, LLC / Welling Compressor Station, 165 Carlisle Rd., Claysville, PA 15323.

In accordance with 25 Pa. Code §§ 127.424, 127.425 and 127.521, the Department is providing notice of intent to issue an initial synthetic minor State Only Operating Permit for a compressor station, located in Buffalo Township, Washington County.

MarkWest operates two 1,380 hp compressor engines controlled by oxidation catalyst, six 1,980 hp compressor engines controlled by non-selective catalytic reduction, eight tanks controlled by vapor recovery units, four methanol tanks, two glycol dehydration units with reboilers controlled by enclosed flares, four electric reciprocating compressors, miscellaneous components, six pig receivers, and one pig launcher.

This facility has a potential to emit 37.9 tons/ 12-consecutive month period (12-cmp) of NOx, 53.9 tons/12-cmp of CO, 0.3 ton/12-cmp of SOx, 48.3 tons/12-cmp of VOCs, 9.0 tons/12-cmp of PM10, and 11.0 tons/12-cmp of HAPs. The facility also has the potential to emit 2.9 tons/ 12-cmp of formaldehyde (included in VOCs, previously listed), 0.9 ton/12-cmp of benzene, 0.02 ton/12-cmp of ethylbenzene, 1.2 tons/12-cmp of toluene, 2.4 tons of xylenes, 1.3 tons of n-hexane, and 13,693 tons/12-cmp of methane.

The facility is required to conduct regular surveys of the site while operating to ensure compliance with visible, fugitive, and malodor emission requirements and maintain records of those surveys. The proposed operating permit limits the glycol circulation rate to 15 gpm and the stripping gas rate to 40 scfm on the first dehydration unit, and limits the glycol circulation rate to 12 gpm and the stripping gas rate to 70 scfm on the second dehydration unit.

The air quality permit includes emission limitations, operating requirements, monitoring requirements, work practice standards, testing, reporting, and recordkeeping requirements for the site.

The application, DEP’s Review Memorandum, and the proposed permit are available for public review during normal business hours at DEP’s Southwest Regional Office, 400 Waterfront Drive, Pittsburgh, PA 15222.

A file review can be scheduled through the DEP’s website at https://www.dep.pa.gov/Citizens/PublicRecords/Pages/Informal-File-Review.aspx or by contacting Tom Joseph, Facilities Permitting Chief, directly. Those who wish to provide the Department with additional written information that they believe should be considered prior to the issuance of the State-Only Operating Permit may submit the information to Tom Joseph, Facilities Permit Chief, Department of Environmental Protection, Southwest Regional Office, 400 Waterfront Drive, Pittsburgh, PA 15222.

Each written comment must contain the name, address and telephone number of the person submitting the comments, identification of the proposed Operating Permit (63-00958) and concise statements regarding the relevancy of the information or objections to issuance of the Operating Permit.

All comments must be received prior to the close of business 30 days after the date of this publication. A public hearing may be held in accordance with 25 Pa. Code § 127.429, if the Department, in its discretion, decides that such a hearing is warranted based on the information received.

If a public hearing is held, all persons who have properly filed a protest under 25 Pa. Code § 127.426 may appear and give testimony. The Department is not required to hold a conference or hearing. The applicant, the protestant, and other participants will be notified of the decision to hold a hearing (and the time, place and purpose of such hearing) by publication in the newspaper or by the Pennsylvania Bulletin, or by telephone, where the Department determines such notification by telephone is sufficient. Written comments or requests for a public hearing should be directed to Tom Joseph, Facilities Permit Chief, at the previously listed address.

Commonwealth of Pennsylvania
Department of Environmental Protection
Air Quality Program
State Only Synthetic Minor Operating Permit
MARKWEST LIBERTY MIDSTREAM / WELLING COMPRESSOR STATION
ISSUE DATE: August 2, 2022
EXPIRATION DATE: August 2, 2027

In accordance with the provisions of the Air Pollution Control Act, the Act of January 8, 1960, P.L. 2119, as amended, and 25 Pa. Code Chapter 127, the Owner, [and Operator if noted] (hereinafter referred to as permittee) identified below is authorized by the Department of Environmental Protection (Department) to operate the air emission source(s) more fully described in this permit. This Facility is subject to all terms and conditions specified in this permit. Nothing in this permit relieves the permittee from its obligations to comply with all applicable Federal, State and Local laws and regulations.
The regulatory or statutory authority for each permit condition is set forth in brackets. All terms and conditions in this permit are federally enforceable unless otherwise designated. State Only Permit No: 63-00958