Emissions estimate · permit route · limits · fees · deliverables · PA · WV · OH · TX
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Title V, PSD, NSPS and state general permits for compressor stations and gas plants
Screening estimate only. Not legal or engineering advice; no filing should rely on it without review by a qualified engineer. Methods and rule citations are shown with every result. Rules and fees change; confirm current requirements with the agency.
Describe the station (state, county and industry segment) and each piece of equipment: compressor engines and turbines, glycol dehydrators, heaters and reboilers, storage tanks, truck loading, equipment leaks, pneumatic controllers, blowdowns, flares, reciprocating compressors and pigging.
The screen estimates each source's potential to emit after controls with cited methods: AP-42 Chapter 3.2 for engines, 3.1 for turbines, 1.4 for heaters, 7.1 for tanks, 5.2 for truck loading and 13.5 for flares, EPA-453 factors for equipment leaks and 40 CFR Part 98 for methane and CO2e. It sums them into facility totals for NOx, CO, VOC, SO2, PM10, PM2.5, HAPs and greenhouse gases.
It then checks the totals and each source against the state program: Pennsylvania GP-5, West Virginia G35-E, Ohio's model general permits, or the Texas permits by rule and standard permit. The result lists blockers, items to review, headroom under the facility caps, the requirements for each source, federal rules to check (such as 40 CFR 60 Subparts JJJJ and OOOOb and 40 CFR 63 Subpart HH), fees, and the deliverables and deadlines, each with its rule citation. Export it as a PDF report or as a CSV file for Excel.
GP-5 (DEP General Plan Approval and General Operating Permit, 2700-PM-BAQ0267) covers natural gas compressor stations, processing plants and transmission stations whose facility emissions, as a 12-month rolling sum, stay below 100 tpy each of NOx, CO, SOx, PM10 and PM2.5, 50 tpy of VOC, 10 tpy of any single HAP and 25 tpy of total HAPs. In Bucks, Chester, Delaware, Montgomery and Philadelphia counties the NOx and VOC caps are 25 tpy. GP-5 cannot be used at a Title V facility, for a source subject to PSD or nonattainment NSR, or where the gas is sour (more than 4 ppmv H2S).
G35-E is the WV DEP Division of Air Quality Class II General Permit for natural gas compressor and/or dehydration facilities, issued 5 September 2024. It replaced G35-D, which is closed to new registrations. A facility must stay below 100 tpy of each regulated pollutant, 10 tpy of any single HAP and 25 tpy of total HAPs and meet the eligibility conditions in section 2.3.1. The registration fee is $500 for construction, modification or relocation, plus a one-time NSPS fee ($1,000) and NESHAP fee ($2,500) where those rules apply.
Ohio EPA issues model general permits (general PTIOs under OAC 3745-31-29) by equipment type: GP 14.01 to 14.10 for natural gas spark ignition engines, GP 15.1 and 15.2 for glycol dehydrators, GP 16.1 to 16.3 for flares, GP 17.1 for reciprocating compressors, GP 18.1 for equipment leaks, GP 19.1 for liquid storage, GP 20.1 for truck loading and GP 21.1 for pigging. A major source is not eligible. The DAPC compressor station guidance adds the potential to emit of every source: if any criteria pollutant reaches 100 tpy, the project may trip major NSR and may not qualify, so contact the permit writer.
Texas has no general permit like GP-5. Outside the 15 Barnett Shale counties, a site whose total emissions stay within 25 tpy each of VOC, SO2 and other sulfur compounds and 250 tpy each of NOx and CO can use the oil and gas permit by rule, 30 TAC 106.352(l). Sweet gas sites claim it by keeping records; only sites handling sour gas (24 ppmv H2S or more) register on Form PI-7. Larger sites use the oil and gas standard permit, 30 TAC 116.620 (registered on Form PI-1S before construction; $900 fee), or a case-by-case NSR permit. Engines and turbines must also meet PBR 106.512. The Barnett Shale counties follow PBR 106.352(a) to (k) or the 2012 non-rule standard permit.
Potential to emit is the most a source could emit at full capacity, normally 8,760 hours a year, counting only controls and limits that are enforceable. The screen calculates it for each source from the equipment data you enter (rated horsepower, heat rate, throughput, tank size and so on) using the cited AP-42, EPA-453 and 40 CFR Part 98 methods, sums it to facility totals and compares those with the state's caps. A source entered without emissions data is left out of the totals and flagged for review.
No. This is a screening estimate that shows which permit route is likely to fit and what it will take. Rules, forms and fees change; the agency's current requirements and a qualified engineer's review govern any filing. Every result shows the method and rule citation behind it so a reviewer can check it, and the PDF report gives them the whole screen in one document.