PERMIT MEMORANDUM 2002-532-TVR 20

OKLAHOMA DEPARTMENT OF ENVIRONMENTAL QUALITY

AIR QUALITY DIVISION

MEMORANDUM June 30, 2005

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

THROUGH: Grover Campbell, P.E., Existing Source Permits Section

THROUGH: Ing Yang, P.E., New Source Permits Section

THROUGH: Peer Review

FROM: Kha Mach, E.I., Existing Source Permits Section

SUBJECT: Evaluation of Permit Application Number 2002-532-TVR

Northern Natural Gas Company

Beaver County Compressor Station

Section 24, T2N, R24E, IM, Beaver County

Located 4 miles east of Elmwood on SH 3

SECTION I. FACILITY DESCRIPTION

Northern Natural Gas (NNG) has requested a renewal of the Title V operating permit for the Beaver County Compressor Station. The facility (SIC 4922) is currently operated under Permit No. 97-148-TV, issued on June 23, 1998. This facility has several stationary internal combustion engines onsite: five 1,326-hp Worthington 4-cycle lean-burn engines (inoperable) and two 1,515-hp Worthington 4-cycle lean-burn engines (inoperable); six 1,894-hp Worthington 2-cycle lean-burn engines, five 1,998-hp Ingersol-Rand KVS 4-cycle lean-burn engines, two 6,000-hp Clark TCVA 2-cycle lean-burn engines, and a 8,000-hp Clark TCVC 2-cycle lean-burn engine, all of which are in compressor service. Five Ingersol-Rand PVG 4-cycle rich burn generators have been replaced by a 1,818-hp Caterpillar G3516B engine (A-6). Heaters located at this facility include: (a) five regeneration heaters: 4.0 MMBTUH (H1), 8.4 MMBTUH dry-bead dehydration (H3), 5.2 MMBTUH (H4), 8.0 MMBTUH (H5), and 6.3 MMBTUH (H8); (b) a 1.0 MMBTUH glycol dehydration regeneration heater (H9); (c) two 0.45 MMBTUH condensate heaters (H10 & H11); and (d) two 5.0 MMBTUH Kewanee fire-tube steam boilers (H6 & H7).

The station was originally built in 1944 with four 1,326-hp Worthington engines (inoperable now) and two 275-hp Ingersol-Rand PVG engines (removed from site). Most of the remaining engines were installed between 1950 to 1967 (See SECTION II). The 98-hp Waukesha engine was installed in 1977 and removed in 1998. The regeneration heaters were installed between 1957 and 1977 (See SECTION II). The two 5.0 MMBTUH Kewanee fire-tube steam boilers were installed in 1993.

Most of the engines are grandfathered sources which were constructed before May 31, 1972 as defined in the Title V Permit Application Guide (3/96).

The three regeneration heaters (H1, H4, and H5), and the 1.0 MMBTUH glycol regeneration heater (H9) are also grandfathered because they were constructed prior to May 31, 1972. The 8.4 MMBTUH heater (H3), the 5.2 MMBTUH heater (H8), and the two 0.45 MMBTUH condensate heaters (H10 & H11) built in 1973 were exempted from permitting because their emissions were below 1 lb/hr. The two 5.0 MMBTUH Kewanee steam boilers (H6 & H7) built in 1993 were also never permitted because their emissions were below 1 lb/hr.

Emission units (EUs) have been arranged into Emission Unit Groups (EUGs) in the following outline. Field-grade natural gas is the primary fuel with the engines and dehydrators are operated continuously. The facility has a maximum capacity of 2 billion SCF/day.

The applicant has requested that the Title V renewal permit incorporate the following changes to facility equipment and operations: (1) updating horsepower of the engines and heater ratings based on site conditions, (2) updating the emission factors with the current AP-42 factors, and (3) updating removed/added equipment.

EU ID # / Old Description / Type of Change / Date of Change / New Description / Reason for Change /
ENG14 / 1,915-hp Ingersoll-Rand KVS-12 / Modified / 1,998-hp Ingersoll-Rand 412-KVS / Updating hp based on site conditions & correcting model numbers
ENG15 / 1,915-hp Ingersoll-Rand KVS-12 / Modified / 1,998-hp Ingersoll-Rand 412-KVS / Updating hp based on site conditions & correcting model numbers
ENG16 / 1,915-hp Ingersoll-Rand KVS-12 / Modified / 1,998-hp Ingersoll-Rand 412-KVS / Updating hp based on site conditions & correcting model numbers
ENG17 / 2,000-hp Ingersoll-Rand KVS-12 / Modified / 1,998-hp Ingersoll-Rand 412-KVS / Updating hp based on site conditions & correcting model numbers
ENG18 / 2,000-hp Ingersoll-Rand KVS-12 / Modified / 1,998-hp Ingersoll-Rand 412-KVS / Updating hp based on site conditions & correcting model numbers
BV15 / 98-hp Waukesha F817GU / Removed / 1998 / Engine removed from site in 1998
AUX1 / 275-hp Ingersoll-Rand PVG / Removed / 2003 / Engine removed from site
AUX2 / 275-hp Ingersoll-Rand PVG / Removed / 2003 / Engine removed from site
AUX3 / 275-hp Ingersoll-Rand PVG / Removed / 2003 / Engine removed from site
AUX4 / 306-hp Ingersoll-Rand PVG / Removed / 2003 / Engine removed from site
AUX5 / 370-hp Ingersoll-Rand PVG / Removed / 2003 / Engine removed from site
A-6 / 1,818-hp Caterpillar G3516B / Added / 2004 / New emergency engine to replace AUX1 – AUX5
H1 / 5.0 MMBTUH Dehydrator Regeneration heater / Modified / 4.0 MMBTUH Dehydrator Regeneration heater / Updating heater rating based on site conditions
H3 / 7.0 MMBTUH Dehydrator Regeneration heater / Modified / 8.4 MMBTUH Dehydrator Regeneration heater / Updating heating rating based on most current data
H5 / 5.2 MMBTUH Dehydrator Regeneration heater / Modified / 8.0 MMBTUH Dehydrator Regeneration heater / Updating heater rating based on site conditions
H8 / 5.2 MMBTUH Dehydrator Regeneration heater / Modified / 6.3 MMBTUH Dehydrator Regeneration heater / Updating heater rating based on site conditions
H2 / 5.0 MMBTUH Dehydrator Regeneration heater / Removed / Heater removed from site
T-1 / 30,000-gallon Condensate Tank / Modified / 52,000-gallon Condensate Tank / Updating tank capacity based on most current data
T-2 / 30,000-gallon Condensate Tank / Modified / 52,000-gallon Condensate Tank / Updating tank capacity based on most current data
T-3 / 4,030-gallon Ethylene Glycol Tank / Removed / EG storage tank removed from site.
T-13 / Propane Tank / Removed / Removed from site

SECTION II. EQUIPMENT

EUG 1 Grandfathered/Exempted Internal Combustion Engines
EU / Point / Make/Model / hp / Serial # / Const. Date
ENG8 / 8 / Worthington UTC-10 / 1,894 / G-2196 / 1954
ENG9 / 9 / Worthington UTC-10 / 1,894 / G-2197 / 1954
ENG10 / 10 / Worthington UTC-10 / 1,894 / G-2198 / 1954
ENG11 / 11 / Worthington UTC-10 / 1,894 / G-2208 / 1954
ENG12 / 12 / Worthington UTC-10 / 1,894 / G-2209 / 1954
ENG13 / 13 / Worthington UTC-10 / 1,894 / G-2210 / 1954
ENG14 / 14 / Ingersoll-Rand 412 KVS / 1,998 / 412CT183 / 1956
ENG15 / 15 / Ingersoll-Rand 412 KVS / 1,998 / 412CT238 / 1957
ENG16 / 16 / Ingersoll-Rand 412 KVS / 1,998 / 412DT241 / 1957
ENG17 / 17 / Ingersoll-Rand 412 KVS / 1,998 / 412ET292 / 1959
ENG18 / 18 / Ingersoll-Rand 412 KVS / 1,998 / 412ET337 / 1960
ENG19 / 19 / Clark TCVA-16 / 6,000 / 115003 / 1966
ENG20 / 20 / Clark TCVA-16 / 6,000 / 115005 / 1966
ENG21 / 21 / Clark TCVC-16 / 8,000 / 120501 / 1967
EUG 2 Heaters
EU / Point / Make/Model / MMBTUH / Const. Date
H1 / 28 / Dehydrator Regeneration heater / 4.0 / 1960
H3 / 30 / Dehydrator Regeneration heater / 8.4 / 1973
H4 / 31 / Dehydrator Regeneration heater / 5.2 / 1973
H5 / 32 / Dehydrator Regeneration heater / 8.0 / 1966
H6 / 33 / Kewanee Steam Boiler / 5.0 / 1993
H7 / 34 / Kewanee Steam Boiler / 5.0 / 1993
H8 / 35 / Dehydrator Regeneration heater / 6.3 / 1966
H9 / 36 / Glycol Regenerator / 1.0 / 1957
H10 / 37 / Condensate Heater / 0.45 / 1973
H11 / 38 / Condensate Heater / 0.45 / 1973
EUG 3 Tanks
EU / Point / Contents / Barrels / Gallons / Const. Date
Tanks / T1 / Condensate (pressurized) / 1,238 / 52,000 / 1940
T2 / Condensate (pressurized) / 1,238 / 52,000 / 1940
T4 / Ethylene Glycol / 143 / 6,000 / 1971
T5 / Methanol / 420 / 17,625 / 1971
T6 / Lube Oil / 197 / 8,272 / 1967
T7 / Lube Oil / 197 / 8,272 / 1967
T8 / Lube Oil / 310 / 13,000 / 1960
T9 / Lube Oil / 283 / 12,000 / 1960
T10 / Lube Oil / 12 / 500 / 1977
T11 / Used Oil (UST) (Drain Tank) / 210 / 8,800 / 1990
T12 / Cooling Water (UST) / 210 / 8,800 / 1990
T14 / Gasoline / 12 / 500 / 1978
T15 / Diesel / 12 / 500 / 1978
T16 / Water / 400 / 16,800 / 1981
T17 / Water / 400 / 16,800 / 1981
T18 / Oily waste water / 210 / 8,800 / 1990
T19 / Used oil / 210 / 8,800 / 1990
T20 / Condensate / 48 / 2,000 / 1998
T21 / Oily waste water / 210 / 8,800 / 1990
T22 / Oily waste water / 210 / 8,800 / 1990
T23 / Lube oil transfer tank / 12 / 500 / No date
T24 / Methanol transfer tank / 12 / 500 / No date
T25 / Used oil tank (basement bdlg 1) / 5.6 / 235 / ---
T26 / Ethylene Glycol / 24 / 1025 / ---
T27 / Used oil tank / 9 / 375 / ---
T28 / Used oil (vent) / 2.5 / 105 / ---
T29 / BTEX Vent tank (fiberglass) / 2004
EUG 4 Fugitives
EU / Number Items / Type of Equipment
Fugitives / 500 / Valves
2000 / Flanges
39 / Other
Stack Parameters
EU / Source
(make/model) / Height
(feet) (1) / Diameter
(feet) (2)
ENG8 / Worthington UTC-10 / 28 / 1.67
ENG9 / Worthington UTC-10 / 28 / 1.67
ENG10 / Worthington UTC-10 / 28 / 1.67
ENG11 / Worthington UTC-10 / 28 / 1.67
ENG12 / Worthington UTC-10 / 28 / 1.67
ENG13 / Worthington UTC-10 / 28 / 1.67
ENG14 / Ingersoll-Rand 412 KVS / 28 / 1.67
ENG15 / Ingersoll-Rand 412 KVS / 28 / 1.67
ENG16 / Ingersoll-Rand 412 KVS / 28 / 1.67
ENG17 / Ingersoll-Rand 412 KVS / 30 / 1.67
ENG18 / Ingersoll-Rand 412 KVS / 30 / 1.67
ENG19 / Clark TCVA-16 / 36 / 3.33
ENG20 / Clark TCVA-16 / 36 / 3.33
ENG21 / Clark TCVC-16 / 38 / 4.67
H1 / Dehydrator Regeneration Heater / 20 / 0.83
H3 / Dehydrator Regeneration Heater / 30 / 1.00
H4 / Dehydrator Regeneration Heater / 12 / 1.33
H5 / Dehydrator Regeneration Heater / 12 / 0.67
H6 / Kewanee Steam Boiler / 15 / 1.00
H7 / Kewanee Steam Boiler / 15 / 1.00
H8 / Dehydrator Regeneration Heater / 12 / 0.67
H9 / Glycol Regenerator / 20 / 0.83
H10 / Condensate Heater / 15 / 0.83
H11 / Condensate Heater / 15 / 0.83

(1) Stack heights of Engines obtained from actual field measurements by Benham

(2) Data obtained from NNG

SECTION III. EMISSIONS

Emissions estimates for the engines are based on continuous operation and AP-42 (7/00) Chapter 3.2. Estimated emissions for the regeneration heaters are based on AP-42 (7/98) Chapter 1.4. Emission estimates for the glycol reboiler are based on AP-42 (7/98) Chapter 1.4. Emissions for the condensate tanks with a condensate throughput of 7,680,000 gallons per year are negligible since the condensate tanks are pressurized. Fugitive VOC emissions are based on EPA’s 1995 Protocol for Equipment Leak Emission Estimates (EPA-453/R-95-017), an estimated percent C3+, and an estimated number of components. Loadout emissions are estimated using AP-42 (1/95), Section 5.2.

Emission Factors (AP-42 (7/00) Chapter 3.2)

EU

/

Engine

/ Horsepower (hp) / Engine Type / Fuel Consumption (Btu/hp-hr) / NOx
(lb/MMBTU) / CO
(lb/MMBTU) / VOC
(lb/MMBTU)
ENG8 – ENG13 / Worthington UTC-10 / 1,894 / 2SLB / 8,415 / 3.17 / 0.386 / 0.12
ENG14 - ENG18 / Ingersoll-Rand 412 KVS / 1,998 / 4SLB / 8,030 / 4.08 / 0.317 / 0.118
ENG19 - ENG20 / Clark TCVA-16 / 6,000 / 2SLB / 7,480 / 3.17 / 0.386 / 0.12
ENG21 / Clark TCVC-16 / 8,000 / 2SLB / 7,480 / 3.17 / 0.386 / 0.12
EUG 3 Tanks /
EU / Point /

Contents

/ Gallons / Throughput (gal/hr) / VOC Emissions (TPY) /
Tanks / T1 / Condensate (pressurized) (1) / 52,000 / 3,840,000 / ---
T2 / Condensate (pressurized) (1) / 52,000 / 3,840,000 / ---
T4 / Ethylene Glycol / 6,000 / 72,000 / ---
T5 / Methanol / 17,625 / 211,500 / 0.23
T6 / Lube Oil / 8,272 / 99,264 / ---
T7 / Lube Oil / 8,272 / 99,264 / ---
T8 / Lube Oil / 13,000 / 144,000 / ---
T9 / Lube Oil / 12,000 / 144,000 / ---
T10 / Lube Oil / 500 / 6,000 / ---
T11 / Used Oil (UST) / 8,800 / 105,600 / ---
T12 / Cooling Water (UST) / 8,800 / 105,600 / ---
T14 / Gasoline / 500 / 6,000 / 0.06
T15 / Diesel / 500 / 6,000 / ---
T16 / Water / 16,800 / 201,600 / ---
T17 / Water / 16,800 / 201,600 / ---
/ T18 /

Oily waste water (2)

/ 8,800 / ---
/ T19 /

Used oil

/ 8,800 / ---
/ T20 / Condensate / 2,000 / ---
/ T21 / Oily waste water / 8,800 / ---
/ T22 / Oily waste water / 8,800 / ---
/ T23 / Lube oil transfer tank / 500 / ---
/ T24 / Methanol transfer tank / 500 / ---
/ T25 / Used oil tank (basement bdlg 1) / 235 / ---
/ T26 / Ethylene Glycol / 1025 / ---
/ T27 / Used oil tank / 375 / ---
/ T28 / Used oil (vent) / 105 / ---
/ T29 / BTEX Vent tank (fiberglass) / ---

Total

/ 0.29

(1) The condensate tanks are the pressurized tanks as informed by NNG at the inspection.

(2) Emissions from tanks T18 – T29 are insignificant.

EUG 4 Fugitive VOC Emissions
Equipment / Mole %C3+ / Emission Factor / (lb/hr) / TPY
500 Valves / 0.33 / 0.00992 / 0.02 / 0.07
2000 Flanges / 0.33 / 0.00086 / 0.01 / 0.02
39 Other / 0.33 / 0.01940 / 0.00 / 0.01
TOTAL / 0.03 / 0.11
Total Potential Emissions /
EU / NOx / CO / VOC /
lb/hr / TPY / lb/hr / TPY / lb/hr / TPY /
ENG8 / 50.52 / 221.29 / 6.15 / 26.95 / 1.91 / 8.38
ENG9 / 50.52 / 221.29 / 6.15 / 26.95 / 1.91 / 8.38
ENG10 / 50.52 / 221.29 / 6.15 / 26.95 / 1.91 / 8.38
ENG11 / 50.52 / 221.29 / 6.15 / 26.95 / 1.91 / 8.38
ENG12 / 50.52 / 221.29 / 6.15 / 26.95 / 1.91 / 8.38
ENG13 / 50.52 / 221.29 / 6.15 / 26.95 / 1.91 / 8.38
ENG14 / 65.46 / 286.71 / 5.09 / 22.28 / 1.89 / 8.29
ENG15 / 65.46 / 286.71 / 5.09 / 22.28 / 1.89 / 8.29
ENG16 / 65.46 / 286.71 / 5.09 / 22.28 / 1.89 / 8.29
ENG17 / 65.46 / 286.71 / 5.09 / 22.28 / 1.89 / 8.29
ENG18 / 65.46 / 286.71 / 5.09 / 22.28 / 1.89 / 8.29
ENG19 / 142.27 / 623.14 / 17.32 / 75.88 / 5.39 / 23.59
ENG20 / 142.27 / 623.14 / 17.32 / 75.88 / 5.39 / 23.59
ENG21 / 189.69 / 830.85 / 23.10 / 101.17 / 7.18 / 31.45
H1 / 0.40 / 1.75 / 0.34 / 1.47 / 0.02 / 0.10
H3 / 0.84 / 3.66 / 0.70 / 3.08 / 0.05 / 0.28
H4 / 0.52 / 2.27 / 0.44 / 1.91 / 0.03 / 0.12
H5 / 0.80 / 3.49 / 0.67 / 2.93 / 0.04 / 0.19
H6 / 0.50 / 2.18 / 0.42 / 1.83 / 0.03 / 0.12
H7 / 0.05 / 2.18 / 0.42 / 1.83 / 0.03 / 0.12
H8 / 0.63 / 2.75 / 0.53 / 2.31 / 0.03 / 0.15
H9 / 0.10 / 0.44 / 0.08 / 0.37 / 0.01 / 0.02
H10 / 0.05 / 0.20 / 0.04 / 0.16 / <0.01 / 0.01
H11 / 0.05 / 0.20 / 0.04 / 0.16 / <0.01 / 0.01
Tanks / --- / --- / --- / --- / --- / 0.29
Fugitives / --- / --- / --- / --- / 0.03 / 0.11
Loadout (1) / 2.65 / 11.60
TOTAL / 1,108.59 / 4,857.54 / 123.77 / 542.08 / 41.81 / 183.48

(1) Estimated annual throughput of 7,680,000 gallons at 61.98°F, 3.06 psia, and 69 lb/lb-mol.