Oklahoma department of environmental quality

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MEMORANDUM March 30, 2006

TO: Dawson Lasseter, P.E., Chief Engineer, Air Quality Division

THROUGH: Eric Milligan, P.E., Engineering Section

THROUGH: Dale Becker, P.E., New Source Permits Section

THROUGH: Peer Review

FROM: Donna Lautzenhiser, E.I., New Source Permits Section

SUBJECT: Evaluation of Permit Application No. 2005-026-O

CenterPoint Energy Field Services

Smallwood Compressor Station

Section 10-T3N-R21E, Pittsburg County

Driving Directions: From Hwy 270 in Haileyville, OK take Junction Hwy 63 (left), go approximately 1.5 miles to Smallwood Rd., turn left, take right at “Y” and follow to site.


CenterPoint Energy Field Services (CEFS) has submitted an application for a Title V operating permit on January 3, 2005, as required by Consent Order No. 04-369, for the Smallwood Compressor Station (SIC 1311) which is an existing facility that was not currently permitted. A construction permit for the addition of one 810-hp Caterpillar G3512 TALE compressor engine was issued May 5, 2005. As of January 18, 2006, the 810-hp engine had not been installed and there was no projected installation date. PTE for NOx without controls is 100.91 TPY based on 19 g/hp-hr for the existing 550-hp Caterpillar G398TA. The facility will be permitted as a “synthetic minor” source.


CEFS owns and operates the Smallwood Compressor Station, a natural gas gathering facility, which consists of one 550-hp Caterpillar G398TA engine equipped with a non-selective catalytic converter, a glycol dehydrator unit, and a 210-bbl condensate storage tank. Other emissions sources include tank truck loading and fugitive emissions. Natural gas is the primary fuel for the engine and glycol dehydration unit, which operate continuously. Natural gas enters the facility and is routed through a separator to remove any entrained liquids and is then pressurized in a natural gas engine-driven compressor. The high-pressure gas is then dried to pipeline specifications and delivered to a sales pipeline. Produced condensate is stored on-site and shipped offsite by tank truck. This station will process approximately 8 MMSCFD, compressing the gas from 15-25-psig to a sales gas pressure of 600-psig. The station is expected to produce about 107,310 gallons of natural gas condensate and recovered water.


Existing emission sources at this facility include one 550-hp Caterpillar Model G398TA internal combustion compressor engine equipped with a non-selective catalytic converter (NSCR) and air-fuel ratio controller (AFR), a glycol dehydrator (H-1) equipped with a 1 MMBTUH burner, and a 210-bbl condensate tank along with tank truck loadout, and process piping fugitives.

Facility Equipment

Emission Unit


Installation Date


550-hp Caterpillar G398TA w/CC &AFR



1 MMBTUH Glycol Reboiler



Glycol Still Column Vent



210-bbl Condensate Tank


SN-06 (LOAD)

Tank Truck Loading



Process Fugitives



Emissions calculations are based on continuous operations and manufacturer’s emissions data for the compressor engine. Combustion emissions from the dehydrator reboiler are based on AP-42, Tables 1.4-1 and 1.4-2 (7/98). Still vent emissions are based on GLY-Calc 4.0, 8-MMSCFD production rate, and 0.6 gpm glycol recirculation rate with no flash tank. VOC flash emissions due to the condensate transfer from the natural gas inlet separator to the atmospheric condensate tank are estimated based on the E&P TANK V2.0 and maximum throughput of 107,310 gallons. VOC emissions for the condensate truck loadout operation are estimated using AP-42 (1/95), Equation (1) in Section 5.2, “Transportation and Marketing of Petroleum Liquids,” and Tables 5.2-1 and 7.1-2. Fugitive emissions from valves, seals, flanges, and connections were estimated to be 0.92 TPY, using EPA’s document, “1995 Protocol for Equipment Leak Emission Estimates,” EPA-453/R-95-017, Table 2-4, Oil and Gas Production Operations Average Emissions Factors.

Brake-specific fuel consumption for SN-01, the 550-hp Caterpillar G398TA compressor engine. has been listed at 8,052 Btu/hp-hr for a fuel consumption of 4,429 SCFH. Air emissions are discharged through a stack 0.83 feet in diameter, 18 feet above grade at a rate of 2,445 ACFM at 1,100 oF. Moisture content of stack gases has been estimated at 18% from fuel usage and the stoichiometric ratio of two SCF of water per SCF of natural gas fuel.

Engine Emission Factors


NOx (g/hp-hr)

CO (g/hp-hr)

VOC (g/hp-hr)

SN-01, 550-hp Caterpillar G398TA*



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