## _i

February 13. 2003 Bradley Belflower

. Georgia Environmental Protection Division

4244 International Parkway Suite 120 Atlanta, GA 30354 (404) 362-4845 Re: Thomaston 

### Compressor Station Permit No. 4992-293-0025-V-01-1 Oxidation Catalyst Proposal Addendum Dear Mr. Belflower: 

# A· 

# ep! Southern

- Natural Gas en EI Pas,O company



### Southern Natural Gas (SNG) Company, adMsion ofEI Paso Corporation, would like to submit the attached Oxidation Catalyst Proposal 'Addendum. The original Oxidation Catalyst Proposal was submitted to GAEPD on September 19. 2002 and subsequenlJnformation was emailed 

### to you on November 3, 2002. The purpose 

### of this addendum is to submit the -jiOst test calibration data, requested on February 7,2003, for the subsequent emissions mapping 1 

### performed on July 25. 2002, one day following the original emissions compliance test. The initial TiUe V emissions compliance test adhered 

### to US EPA test methods 7E, 10. and 320 for the determination
- 

### of NOx, CO, and H 2 

### CO respectively. The emissions mapping data taken the following day conceming CO, O 2 , 

### and H 2 

### CO did not meet all of the guidelines set forth in the test methods mentioned above; however, at 

### the close-of emissions mapping the following day. post test calibration checks were performed on the CO,**~,and H~O**  

### analyzers used in the acquisition of test data. In the case of the CO and O 2 

### analyzers, zero and span drift checks were performed once testing was completed. For**H~O,** 

### calibration transfer standard checks were performed once testing was completed. Taking into account the fact that these analyzers had not been calibrated since the previous day, the post test calibration drift checkS and calibration transfer standard checks demonstrate that each 

### of the analyzers used held its 

### calibration extremely well. Post test drift checks for zero and span calibration gases were within 2% error as allowed by EPA. Post test calibration transfer standard checks were within 5% error as allowed by EPA. Please find attached these drift check forms and calibration transfer standard check forms along with sheets summarizing the results. For each of the three emissions mapping data points acquired, pollutant concentrations were measured for fifteen minutes (via reference method 

### analyzers for CO and**~and** 

### via FTfR for**H~O)** 

### and unit operating data was monitored and recorded 3 • . 

### SNG urges GAEPD to take the above mentioned factors into account when determining the oxidation catalyst inlet temperature range requirements for Permit Unit COO3 located at SNG's Thomaston Compressor Station.

I Emissions mapping data refers to data gathered at various operating conditions of the unit. For Unit C003 at SNG's Thomaston Compressor Station, these various operating conditions include a high horsepowerlow speed, low horsepower-high speed, and low horsepower-low speed settings. These test points, combined 

### with the emissions data taken at high horsepower-high speed during the initial compliimce test, frovide an emissions "map" of the unit covering a broad range of unit operation.

During mapping of Permit Unit C003 on July 25, 2002, pretest calibration checks along with pre and r;sttest bias checks were not perfonned.

See Oxidatipn Catalyst Proposal, submitted to GAEPD on September 19, 2002.

Southern NatulBl Gas 1900 Fifth Avenue North Binningham. Alabama 35203 PO Box 2563 Birmingham. Alabama 35202.2563 teI205.325.7410 fax 205.325.7490

### If you have any questions regarding this matter, please 

## feel free to contact Jonathan Goss concerning data collection issues at (832) 676-4436 or Manish Singh concerning permit issues at 

### (832) 676-7486. Sincerely,

M.S.Catt DMsion Director, Southeast 

### KDB:llj 

# /<.00 Enclosures UPS Tracking No.: 1z 33456901 96534014

S:/ADMl19IKDB 2003ITHOMASTON 2002 CATALYST REPORT ADDENDUM COVERDOC

### STATION: UNIT:

GAS
ZERO SPAN 

## Thomaston 3

CYLINDER No. ALM031393

SX-40853 

# 02 ANALYZER ZERO AND CALIBRATION DATA

DATE: 

### 7/25/2002 RUN: Mapping

INITIAL FINAL CYLINDER ANALYZER ANALYZER VALUE(%) RESPONSE RESPONSE 

## SCANt 7:12:1 I SCAN 

# I 13 43:26 

### 0 0.0860 0.0490
SCAN 

# I 7:22:01 SCAN 

# 1 15

. .,:58 

### 21.1 21.01**20.~34._** 

### . ANALYZER: SERIAL NO.: SPAN VALUE:
ABSOLUTE ;ERVOMEX 140 01415/B231 25
PERCENT DIFFERENCE DRIFT 0.037 0.15% 0.071 0.28%**-~---** --L.....-.-. -_.- ----. -.---**~** 

### f7

### STATION: UNIT:

GAS

, ZERO

SPAN Thomaston 3



### CYLINDER No. AAL13802 ALM002418 

# CO ANALYZER ZERO AND CALIBRATION DATA

DATE: 7125/2002 

### RUN: Mapping


### CYLINDER INITIAL FINAL

VALUE ANALYZER ANALYZER

(ppm) 

### RESPONSE RESPONSE SCAN I 7:12', SCAN 13'43,26 

### 0 0.0360 -0.1120 SCAN I 7:22:01 SCAN I 15'11:58 

### '55.48 55.623 55.353

- 

### ANALYZER: SERIAL NO.: SPAN VALUE: ABSOLUTE DIFFERENCE 0.148 0.27 THERMO 48C 48C-68128-359 100 PERCENT DRIFT 0.15% 0.27%

-- . "iiI



# . J'I



# .**~.**

### Station: THOMASTON, GA 

### EMISSIONS TEST Unit: CAT G36lS Low speed/Med (80%) Torque 

### Drift Zeros

# -P6~'" 

# T**<~** T

.**~eio** 

# Dc.IP 

# r Cit**~Ul.**

7/25/02 01:43:26 PM

Instrument Value Units I 

### Instrument Value Units



# -------------**----------------------------1----------------------------~--------------** 

# CI CO

. -0.112 

# ppJ t 01 CO2 0.059 % 02 

### 0.049 , . I 03 

### NO 0.351 ppm 

### 04 NOX- 

### 2. 939 ppm 

### I 05 

### THC -1.118 ppm 

### *** AtmospheriC Data 

### .*** Instrument Value Units I 

### Instrument Value Units**-·~---------------------·-------------------I-------------------------------------------** 

### 51 Relative Humidity 58.S09 , RH I 52 Amb. 

### Temp. 85.481 F
scanninq Period is 0.12 minute!!).

Values calibrated using file ftC:\Tenneco\CALS\Thomaston Cat 3616 Unit 3**~1-02)** 

### .cal ft •

## 'e"~, 

## r 

# 1> il ,pr C 

## i+e-'I(

Station: 

### THOMASTON, GA EMISSIONS TEST Unit: CAT G3616 7/25/02 01:46:11 PM Low Speed/Ked (80t) Torque Drift Highs Instrument Value Units I Instrument Value Units 

# ------------------------------------------1-----------------------.------------------- 

# <![ CO 55.353 

### PP:I) I 01 

### C02 6.252 % 0220.934 i 1 03 NO

. 161. 536 ppm 04 NOx 175.076 ppm 1 05 THC2470.391 ppm

+++ Atmospheric Data **+ Instrument ! Value Units I Instrument Value Units

### ------------------------------------------1----------------~-------------------------- 51 Relative Humidity 

### 57.495 t RB 

### I 52 

### Amb. Temp. 85.629 F
Scanning Period is 0.12 minute {sl •

Values calibrated using file "C:\Tenneco\CALS\Thomaston Cat 3616 Unit 3 (7-02) .cal".

# A 

# ep Southern Natural Gas an EI Paso company September 19. 2002
Mike Fogle Georgia Environmental Protection Division 4244 International Parkway

. Suite 

### 120 Atlanta, GA 30354 (404) 363-7053 EI Paso Cotporation Mechanical Testing Group 9 Greenway Plaza Houston, TX 17046 Phone: (832) 676-4418

Fax: (832)676-1758 

# RECEIVED JAN 3 1 2003 

# AIR PROTECTION BRANCH

Subject: SNG, Pennit 

### No. 4992-293-002S¥.Q1-1, OxIdation catalyst 

### Proposal


### Dear Mr. Fogle: Southern Natural Gas Company, a division 

### of 

### 8 Paso Corporation, would like to 

### submit 

### the attached oxidation catalyst proposal 

# for permit No. 4992-293-0025-V..o1-1 (one Caterpillar G3616 Internal Combustion engine) for GAEPD approval. This 

### proposal outlines issues sUlTOUnding the establishment of a catalyst inlet temperature range. proper oxidation catalyst operation, and 

### the 

### proposal of a low-end catalyst inlet temperature limit. 

### If you 

### have any questions 

### regarding this matter, 

### please feel 

### free to 

### call me at (832)

## 67~~

# -~**~**

onathan 

### Goss Mechanical 

### Testing Group Plant Services Department EI 

### Paso Corporation Enclosure (1)

# ~**~ ?~~** **~~~** ()e

# :I~**~J(;~~** J) 

# <"'QIG 

# {f**~,.o~rJq~** .



### .

# VQ~

# A 

# ep Southern Natural Gas an EI Paso company bee: 

### Manish Singh for corporate environmental files

. GW9 Room 1632 (832) 

### 676-7486 j"'1<elly Beavers 

### for field 

### environmental files 1900 Fifth Ave. North Birmingham, AL 35203 (205) 

### 325-3784 

### Mark Belizi 

### for station environmental files 5276 Hvvy 

### 19 SOuth Thomaston. GA 30274 

### (706)**647~9821** 

### Mechanical Testing File 

### #: 02-039
ecc: Tom Burgett Tom Tarver George Acker EI Paso Corporation Mechanical Testing Group 9 Greenway Plaza Houston, TX 77046 Phone: (832) 676-4418

Fax: (832) 676-1758

### to. 

# At. 

# ep Southern Natural Gas an EI Paso company EI Paso COtpOration Mechanical Testing Group 9 Greenway Plaza Houston, TX 17046 Phone: (832) 676-4418

Fax: (832) 676-1758



# Oxidation Catalyst Temperature Monitoring 

# and LOAer 

# Unlit Prqx:>sal 

# for One (1) Caterpillar G3616 

# Redprocating Engine Permit Amendment 4922-293-0025-V-01-1 

# Southam 

# Natural Gas Thomaston Compressor Slation Thomaston, Georgia 

# 30286 (Upson County)

Date: Prepared 

### for:
Prepared 

### by: September 

### 19, 2002 State 

# or Georgia Department 

# or Natural Resources 

### Jonathan Goss

. Mechanical Testing Group Plant 

### ServIces Department (832) 67&4436

# Table of Contents
Il'iTRODUCTION

......... _ ......................................... _ .. _. __ ..................................................... ...; •.•.• __ ............ _ ... 1 DATA COLLECTION_

........................................... _ .............. __ .... _ ........................................... _ .................. 2 REsULTS SUMMARY

.......................................................................................................................... , ......................... 

### 2 TEMPERATURE RANGE EST ABLISHMENT

........ _ ... _ .... _ ........... _ ....................................... _ ......... 3 TEST POINTS

................................................................................................................................................................. 3 STACK INSULATION

..................................................................................................................................................... 4 OXIDATION CATALYST FUNCTIONALITY

..................................................................................................... 5

OXYGEN CONTENT

...................................................................................................................................................... 

### 5 CATALYST INLET TEMPERATURE

................................................................................................................................ 5 PROPOSAL

............................................................................................................... ; ................................................... 6 APPENDIX A

............................................ _ ............................ _ ............................................................................ _ 7 REfERENCE METHOD EMISSIONS TEST DATA

................................................................................. ; .......................... 7 

### APPENDIX B ....... __ .... _ .... ____ ._ ............... _._ ...... -. .. _ .. _ .. __ ......... __ ..... _ ..................... _ ............ 9 STEADY STATE CATALYST INLET TEMPERATURE

...........................................................................**~** .......................... 9 APPENDIX C

................ _ .......................... _ ............................ __ .• _ ............... _ .......................... _ ............ 12

CAT AL YST SPECifiCATIONS

...................................................................................................................................... 12 

### APPENDIX D _. ___ .. ___ .......... __ .. _. __ .. __ ... __ ....... __ . __ ._-"

___ .. __ .... __ ..... _ .......... _ ..... 15 EXHAUST DIAGRAM FOR EMISSIONS UNIT Coo3. CA TERPILLARG3616

................................................................ IS 

### APPENDIX E

........... _. __ • __ ... __ ......... _ ........ _ •• _ .. __ ._ •• _ ....... ___ •...**_.~** •. _ .. _. __ ............................ __ 

### 16 UNIT OPERATING DATA

............................................................................................................................................ 

### 16

I

# Introduction This report is an examination of the catalyst inlet temperature data of the Caterpillar G3616 (Unit C003) located 

### at the Southern Natural Gas (SNG). Thomaston compressor station. 

### As per Georgia Environmental Protection Division (GAEPD) Permit Amendment**4922~293-OO25-V-01-1.** 

### SNG performed Title V reference method emissions compliance testing on the afore mentioned unit on July 24.2002 1 • 

### Three data sources were utilized for the 

### compilation 

### of this report and provide a means for analyzing catalyst operational and performance characteristics. These sources are outline below: 1. Data from the 

### Reference Method emissions compliance test of Unit C003 on July 24.2002. 2. Data 

### from the subsequent emissions mapping of UnitCOO3 on July 25, 2002. 3. Data from the units operational software corresponding to Unit C003. SNG feels that these data along 

### with the analysis and supplier specifications. outlined in the following sections of 

### this report. demonstrate that a catalyst inlet temperature range 

### of +1- 

### SOO F, as specified in the permit. will not allow sufficient operating range and is not 

### needed to provide assurance 

### of compliance. SNG does feel, however, that catalyst inlet temperature is an important and significant parameter in determining catalyst. health and proper functionality. The following sections also outline the catalyst supplier's (Clean Air Partners
- Houston Industrial Silencing: CAP-HIS) performance 

### Specifications and reeommended operating guidelines along with SNG's propoSal 

### for catalyst inlet temperature limit establishment.

I The Tille V compIIanc:e report 

### was Slbnitted to GAEPD M August 20. 2002. 1-. ' 

### •


# Data 

# Collection As 

### specified in the introduction, a maximum load test, consisting of three test runs, was conducted on the 

### Caterpillar G3616 reciprocating engine at the Thomaston Compressor Station on July 24, 2002. Summaries of results 

### from the compliance test along 

### with the subsequent mapping data are depicted below in Table 1. The fieldS highlighted in yellow correspond 

### to the 

### mapping data that was acquired on July 25. 2002. These data were taken with the 

### same degree of accuracy as 

### the reference method data. Detailed summaries of the unit's results are included in the APPENDIX A. 

# Results Summary Table 1. Average emissions summary, Unit 

### c003. Caterpillar 00616.
Parameter Run 1 Run2 Run3 Run4 Run 5 RunG Date Tested 7/24f2002 712412002 712412002 7I25l2002 112512002 1I25l2002 Percent Load 96.69 97.07 97.12 60.31 35.14' 63.52 Catalyst Tin 

### fF) 786.00 779.67 750.00 780.50 704.50 727.00 CO Coc:rn) 4.84 4.63 5.31 2.72 5.72 3.20 

### COOP/hrl 0.22 0.21 0.24 0.13 0.26 0.15 CO (IbIhr) Allowable 22.00 22.00 22.00 22.00 22.00 22.00 H@(ppmw) 2.40 2.40 2.45
. 1.05 1.72 0.76 H£OCDOmd) 2.70 2.70 2.75 1.20 1.97 0.87 H£OClbIhr) 0.15 0.15 0.16 . 0.06 0.10 0.04 H£O (lblhr) Allowable 2.20 2.20 2.20 2.20 2.20 2.20 Oxygen(%) 10.91 10.89 10.81 10.47 9.93 10.61


### The operating data corresponding 

### to the Caterpillar G3616 was acquired 

### from the 

### units control system. These data correspond 

### to a date range 

### from July 17, 2002 through September 18, 2002 (see APPENDIX E). The data shows extended periods in which the 

### unit was offline. Only the 

### data 

### from steady state operations 

### was used in this evaluation 2 • 

### These data were analyzed and plotted as a time function. These charts 

### will be 

### explained in detail in the TEMPERATURE RANGE 

### section of this report.

2 GAEPD permit amendment 4922-293-0025-V-01-1 specifies reporting cA excursions only when the catalyst temperature has been 

### out cAthe established r.ange for a period cAlhree hcU's. Therefore, b this data analysis. only**st~** state operating data was analyzed. Steady state operating data is hereby specified as data taken While the unit has been in operation for a time period 01 no less !han 

### one hct.r. 

### 2

# Temperature Range Establishment GAEPD 

### Permit Amendment 

### 4922·293-0025-V..()1·1 specifically outlines procedures for establishing a +/. 

### 50° F temperature range for the 

### oxidation catalyst. Below is an excerpt from 

### Section 

### 4.2.2 of 

### the afore mentioned permit amendment: 

### During !he 

### tests required by 

### Condition. 

### No. 4.2.1, !he**Perm~ee** 

### shaH monitor and 

### record !he 

### il\et temperature 

### of !he Oxidation Catatyst**~D.** 

### No. COO3C) 

### using !he 

### devise required by 

### Condition 5.2.2. 

### The Permitee**shaI~** 

### using !he 

### temperature 

### data andlhe resulls 

### of !he performance 

### tests, determine lhe average 

### inlet 

### temperature at 

### which· COI'TlprlSl'lCe 

### with the applk::ab\e emissions 

### Iimit:atioos for 

### carbaI 

# mooome (CO) and 

### bmaldehyde (HCHO) 

### stipulated in Condition 

### Nos. 3.2.1 and 3.2.3 is 

### achieved. 

### For !he 

### purpose of reporting excursions required by 

### Condition 

### 6.1.7 c 

### I, the 

### inlet 

### temperature 

### range shall be 

### tie average 

### illat temperature pIuslminus 

### f:IIJ Fahrenheit. Within sixty (SO) 

### days 

### after lhe 

### tests 1t\e Permitee 

### shaD submit a report 

### !hat 

### contains all 

### of tie 

### illet 

### temperature data 

### recorded for 

### tie 

### day of testing 

### with identification 

### of tie periods for each 

### test 

### run and 

### tie temperature 

### range established fa'tIe Oxidation Catalyst.

. 

### SNG feels that a catalyst inlet temperature range of +/. 

### flJo 

### F is not appropriate according to 

### the data sources outlined in the INTRODUCTION section 

### of this report. This section will address issues involved with establishing a temperature range of 

### +/. 

### 50° F. 

# TestPoin1s

. The data 

### from the reference method emissions compliance test along 

### with data 

### from the

subsequent engine emissions

. mapping. encompasses a wide. operational range.· APPENDIX 

### A contains all emissions compliance and mapping data. The compliance test data represents operating and emissions data at ful,. speed and load while the mapping data is more comprehensive. The mapping data represents subsequent data at 

### three additional points. These points are:
• High speed, low 

### torque
• Low speed, 

### low torque 

### (2741 HP @ 

### 998 RPM) 

### (1597 HP 

### @ 

### 803 RPM)

• Low speed, medium torque 

### (2887 HP @ 

### 799 RPM) SNG feels that these additional test points provide sufficient data for claSSifying the entire operating range of 

### Unit c003. These data points, along 

### with other steady state operating data acquired 

### prior to exhaust 

### piping insulation (see STACK INSULATION), display a catalyst inlet temperature 

### operating range 

### of between 688.73° Fand 793.00° F. This temperature array would be 

### out 

### of any established**ran~** 

### set by SNG. It is important to note; however, that although there was over a +/. 

### 50 F temperature variability in the examined data, the CO .and HCHO levels determined by means 

### of emissions compliance testing and mapping were at levels significantly below permit values (see Table 1).



### 3-;



## ... FI'IR Post Test Calibration Transfer Standard (CTS) Check



## File Name Date / Time Jul25 12:43:46 200: 

## Ethylene (ppm)
101.52**[~--:1Cl1~56-~** 

### 101.53

..... ::'\1 

### Error 

## (Percent) 1.50% 1.52% 1.56% 

### 1.53%· 5.00%Method title: Method file name: Meth DevMlssissippi C:\Omnic\Gasanal\thomaston2.qnt Spectrum title: Thu Jul25 12:42:04 2002 • CTS Post System 1 Spectrum file name: Spectrum date: Index Thu JuI2512:43:46 2002 Component 

### 1 Carbon Monoxide 

### 2 Carbon dioxide 3 Nitric oxide 4 Nitrogren dioxide 

### 5 Nitrous oxide 

### 6 Methane 

### 7 Acetylene 

### 8 Ethylene· 

### 9 Ethane 

### 10 Propylene 11 Formaldehyde 12 Water ·13 Propane

14 Ammonia 15 Sulfur hexafluoride 16 Acetaldehyde 17 Acrolein 

### 18 NOx 19 Total Hydrocarbons 

### 20 Non Methane Hydrocarb Concentration Std. error 

### 0.0105 ·8.021 1.5208 0.0023 -0.0246 2.3752 -0.241 101.4972 ·1.299 -1.0643 -0.0248 59.0947

1.0039 -0.1987 

### -0.0031 -0.0175 -1.3733 j.5231 192.2697



### 189.657 0.02516 23.70582

0.46735 0.02315 0.04099 2.85409 0.36894

0.3405 1.07601 1.10682 0.06327 72.46194



### 0.54508 0.36337 0.00961 0.06374 1.82534 0.49049 8.53411 5.39462 

# F 

# r I 

### ill 

# 1>01'" r,H'**(r~** <:.

## JI~c.k ;I: jMethod title: Method file name: Meth Oev Mississippi C;\Omnic\Gasanal\thomaston2.qnt Spectrum title: Thu Jul 25 12:45:32 2002
- CTS Post System 3 Spectrum file name: Spectrum date: Index Thu Jul 25 12:47:08 2002 Component 1 Carbon Monoxide 2 Carbon dioxide 3 Nitric oxide 4 Nitrogren dioxide 5 Nitrous oxide 6 Methane 7 Acetylene 

### 8 Ethylene 

### 9 Ethane 10 Propylene 11 Formaldehyde 12 Water 13 Propane 14 Ammonia 15 Sulfur hexafluoride 16 Acetaldehyde 17 Acrolein 

### 18 Ndx 19 Total Hydrocarbons 20 Non Methane Hydrocarb Concentration Std. error 0.0094 -6.3666

1.5939 0.0034

0.018 1.9672

-0.04 101.5645

-1.4171 -0.9846 -0.1447 15.4442

1.0382 -0.1944 ..0.0021 -0.0302 -1.2627 1.5973 192.434

190.27 0.02616 20.00492

0.47652

0.0234 0.06007 2.84907 0.32424 0.33941 1.07412 1.13227

0.059 62.83828

0.54413 0.36221 0.00958 0.05943 1.81953 0.49993 8.38561 5.25163 

# F 7" Itt**P~.T Tc!~**  

# en Cf-fe(.1<

### ~3

## '"

Method title: Method file name: Meth Dev Mississippi C:\Omnic\Gasanal\ttiomaston2.qnt Spectrum title: Thu Jul25 12:43:512002· CTS Post System 2 Spectrum file name: Spectrum date: Index Thu Jul 25 12:45:28 2002 Component 1 Carbon Monoxide 2 Carbon dioxide 3 Nitric oxide 4 Nitrogren dioxide 5 Nitrous oxide 6 Methane 7 Acetylene 8 Ethylene 9 Ethane 10 Propylene 11 Formaldehyde 12 Water 13 Propane 14 Ammonia 15 Sulfur hexafluoride 16 Acetaldehyde 17 Acrolein 

### 18 NOx 19 Total Hydrocarbons 20 Non Methane Hydrocarb Concentration Std. error 0.0017**~.4325**

1.563 -0.0001 0.0178 2.0219 0.0549 101.517 -1.3193 ·1.0611 ·0.0346 43.1555

1.0097 -0.2355 -0.0025 -0.0047 -1.3287 1.5629 192.7881

190.564 0.02478 21.70929

0.48198 0.02252 0.06178 2.83276 0.33852 0.33806 1.06797 1.12149 0.06254 70.08884

0.54101 0.36078 0.00954 0.06301 1.81231 '0.5045 8.38731 5.27127 

# Petit 'PeST T£l' ( T) 

## c.1I £., /( 

# -It,.

# Stack Insulation Prior to the submittal of this report yet following the compliance emissions testing and mapping, insulation was placed on the portion 

### of the 

### exhaust piping leading up to the exhaust Silencer (see APPENDIX 0). This insulation was added solely for the purpose of personal protection. This insulation also increased the measured temperature for a given operating condition. and should lead to lower sensitivity 

### to swings in ambient temperature. This increase can be seen in the plots generated from operating data acquired prior 

## to and

. data acquired following the installation of the insulation (see APPENDIX B). The average temperature prior to insulation installation was 

## n9. -,0 F while the average after insulation installation is 806.4° F for and average catalyst temperature increase of 26.-,0 F. SNG, 

### along with the catalyst supplier. believe that this increase in catalyst inlet temperature will only aide in the reduction of CO and HCHO. The following seCtion explains in detail the functionality 

### of the oxidation catalyst.

4

# Oxidation Catalyst Functionality An 

### oxidation catalyst facilitates the breakdown of excess O 2 

### molecules in the exhaust stream. The resulting oxygen atoms are subsequently available to 

### bond with theCa molecules in the exhaust stream to form**C~,** 

### thereby reducing the CO levels in 

### the exhaust. 

### The 

### two most important varialJles 

### to consider when examining catalyst performance are catalyst inlet temperature and O 2 

### concentration. 

# Oxygen Content The primary concern for the proper operation of the oxygen catalyst is the excess oxygen levels present in the exhaust stream. CAP-HIS has indicated that the oxidation catalyst supplied 

### to SNG for use on Unit C003 at the Thomaston compressor station will operate at oxygen levels as low as 4% to 5%**~.** 

### Oxygen levels of Unit COO3 and similar units produced by Caterpillar exhibit oxygen levels. on average. of 12.3% O 2 , 

### During emissions compliance testing oxygen levels ranged from 10.81% to 10.91% O 2 

### for an average of 10.81% O 2 , 

### The average oxygen levels for all compliance and mapping data is 10.60% O 2 , 

### Unit COO3 at the Thomaston compressor station utilizes an air 

### I fuel ratio controller which regulates the amount of air available for combustion. Due 

### to the design characteristics of this engine. significant excess air is required for proper operation. This excess air is demonstrated by the test data presented above. Furthermore. the unit will always 

### operate well in excess of the 4% O 2 

### required by 

### the catalyst 

### for oxidation process. 

# catalyst 

# Inlet Temperature Catalyst inlet temperature is a key contributor 

### to the proper operation and reduction efficiency of anoxldation catalyst For the oxidation catalyst that SNG has employed for the CaterplllarG3S16 at its Thomaston Compressor Station. CO conversion begins at a catalyst inlet temperature of just above 200° F. 95% levels of reduction are achieved at 300° F. SimHar results are achieved for the reduction of HCHo. CAP-HIS has stated thae:



### .. The 

### oxidation of formaldehyde 

### il 

### this application 

### tracks !he 

### curve for 

### CO ck:>sely. Starting 

### at

approximately 

### 400 degrees 

### F, lhe 

### curve will parallellhe 

### CO 

### curve. Being that 

### the HCHO curve parallels 

### the CO curve and begins reduction 

### of HCHO at 400° F, it stands to reason that a 95% reduction will be 

### achieved at a catalyst inlet temperature 

### 6f600° F. The supplier also states that the maximum catalyst inlet operating temperature for 

### proper operation is 1150° F. 

### For the Caterpillar G3S16. this temperature is one that will never be 

### attained 'under normal operating conditions and an alarm and/or shutdown would occur at

. a temperature much lower than 1150° F.

. .



### 5I • 

# Proposal The preceding sections have outlined the manner in which all data used in this evaluation was collected and processed, why GAEPO permit amendment temperature range requirement 

### is out of the 

### scope of the normal operating range of Unit COO3, and the basic functionality of 

### the oxidation catalyst installed on UnitCOO3. This section outlines SNG's proposal for a catalyst Inlet temperature lower limit establishment rather than a +/- 

### SOO F operating window. SNG would like to propose the establishment of a low-end catalyst inlet temperature limit of 

## 650 0 

## F which, based on the factors below, is reasonable. and prudent for suffICient reduction of CO and HCHO. 1. A catalyst inlet temperature range of +/- 

### SOO F is not appropriate according to the data presented. 2. Required excess 02 levels will always be present in the exhaust stream. 3. catalyst light off curves supplied· by catalyst

. supplier show a minimum temperature of 600° F for 95% reduction of CO and HCHO. SNG feels that the factors listed above strongly support 

### the establishment of a low-end catalyst inlet temperature limit of 

### 65(f F. This low-end limit will provide the operational flexibility needed while still maintaining a reasonable margin of compliance

..



### 6

# · '," . 

# . ' 

### , 

# Appendix 

# A

Reference Method 

# Emissions Test ·Data

7

# A Southern 

# ep Natural Gas an 

### EI Paso company

- lAseD 011 FUEt.1PECI'IC OIlY '-FACTOR CALCUl.ATIOII "eASED 0II1i111T1tODS , ... 'I!IM!D 011 CMSOIIIIALMCIi ISTOICH. + Ci21

• AIf • TOT

.... MASS RATIO COMPANY: SNO BORE: STATION: Thom

.. ton STROKE: UNIT : 3 RATED RPM: ENGINE TYPE: c.wrpm_ 03116 RATEDBHP: DATE: Jul-02 RATEDBMEP: to

11.8 In. FUEL ORifICE DIAM. 1.125 In. 11.8 In. FUEL TUBE DIAM. : 1.93. In. 1000 RPM AGAUDHV: 1026 btuldecf 4545 8NP AGALDHV: 926 btu/dlSCf 174 psi

# AppendixB Steady State Catalyst Inlet Temperature

9

### Catalyst Inlet Temperature VS Time Pre-Insulation**800~----------------~---------------------------------------------------------,**



### 180·



# -**~160** 

# - e 

# t
E 140**~.** 

## -; 

# :s


# -**~** 

## S 120 co 

### u



### 100· 

# .. &t 

# 1.

. I 0 

# If·......**~** Average 

# = 719.1 F 

### &**~** 

### &


# ... _---



# . 4**!-~-** #fA 

# i

• .. &

...

# ~ 6 

# • •

I

## ----.-.J • Compliance • Mapping &**~teady** State


# •**680·~1-----------T----------~--~--------~----------.-~---------r----------~** 

### 7/13/2002 0;00 7/18/20020:00 

### 7/23/2002 0:00 1128/2002 0;00 Time (hours) 

### 81212002 0;00 8n120020:00 8112/2002 0:00 •


# ..

## •

Catalyst Inlet Temperature VS Time Post-Insulation**MO~----------------------~----------------------------------------------------~**

830


### fL 

# e. 820 

# e

# ~**~** 

### E**~** 

# i .5 810


## -; J!' S 800 t'D U


### 790 

# • ; 

# ( 

# • 

# • • •• 

# •

• •
•

• . ____**c.~**



# • --- • T 

# • • •

• 

# •
• 

# • 

# • • 

# •• 

# .' •• Average =806.4 of



# •**780+'------~--------r-------~------_r------~------~r_------~------_.------~** 

### 817/20020:00 8112/2002 8117/2002 8/22/2002 8/2712002 9/1/20020:009/6/20020:00 9/11/2002 9/16/2002 9/2112002 

### 0:00 0:00 0:00 0:00 0:00 0:00 0:00

, Time (hours) 

# ..

.. 

# ..-'"' 

# .. AppendixC Catalyst 

# Specifications

12-f,

# ~ "1J 

# !a 

# OXIDATION OATALYST 

# 00 AND HYO'AOCARBQN LIGHTOFF

100 

# I 

# '""? : =t : ;; • : :: :: I 

# o ·0



# n 

# v 

# e r' 50 

# a ' I 

# o 

# n 20 

# % 10 

# co ,Butane**~** 

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## .... Ul

### ~ 

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## 2 Ul ;u m t:I 

### c n -f 

# 2 0'" • f. I ..1..

... 1 • 

## I 200 300 400 600 

# aoo 700 800 gOO 1000 1100 1200 Ul
-f 0 

# Temperature, 

# OF 

# urn**~),.kt** 

# I DeNOJJC 

## oS.r LENCER

# ~**~** CATALYTIC CONVERTER/SILENCER 

## vl 

# I

. ro leAl.E.**A~~ROVI!O** ay, DR"Y'" BY, 

# I
DATE: 

# I '

. f ftCVlstD

# ~ 

# Houston 

# Industrial Silencing P.o. BOX. 19835 HOUSTON, TeXAS 77224 I

__ ....... _ ....... __ _**~OS5** • 

## ...forrathan- =-' ".-...

. ."- From: HIS {his@hisdnox.com] Sent: Thursday. September 19. 200211:59 AM To: jonathan.goss@elpaso.com Subject: Oxidation Curve Jonathan: The oxidation of formaldehyde in this application tracks the curve for CO closely. Starting at approximately 

### 400 degrees 

### F_. the curve will parallel the CO curve. Sincerely. Harold 

### l. Harris CAP-HIS Emissions Reduction Systems Phone: 281-463-8883 Fax: 281-463-8951 his@hisdnox.com

# .AppendixD Exhaust Diagram for Emissions Unit COO3, Caterpillar G3616 

# • 32"

Catalyst



### Exhaust Flow**-----I~** ....



### 15 Test Port

Test Port

Temperature Transmitter

# ..**~:** 

# AppendixE Unit Operating Data

16

# A ISouthern 

# ep Natural Gas, _elPMooompany

"HG 'HG PSIG :M.5; i\1,.3.**~~** o.Oj. 0.0, 0etF I'; 140:**'.5~** DegF 791 ;eiJ; '. 110'

### .~.. 

## 'i!j'!s'l. ,11; DegF

.. ..**,~,** ... 1!1: 

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### 1361 

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### Thomaston Compressor Station Unit 3 25-Hour log

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i 17! n 1 Stitt DatelTlme: 7/1112002 09;00 End Dale/Time: 7/1212002 09:00

0: 211' ..0.4 100' 

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. End DatelTime: 7118/200209:00

• '

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