 

MEMORANDUM - DRAFT

DATE:	April 25, 2007

SUBJECT:	Summary of the Thunder Creek FB-1156 Compressor Station

	Spotted Horse, Wyoming Compressor Engines Test Report

FROM:	Lucy Adams

Alpha-Gamma Technologies, Inc.

TO:		Jaime Pagán, EPA Energy Strategies Group

This memorandum summarizes the June 12, 2002, test report for eight
natural gas fueled reciprocating compressor engines at the Thunder Creek
FB-1156 Compressor Station.  The compressor station is located in
Section 11, Township 55 North, Range 76 West, approximately 9 miles
northwest of Spotted Horse, in Campbell County, Wyoming.  This test
report was submitted to Docket ID Number EPA-HQ-OAR-2002-0059 and can be
found in that docket as Document ID Number 0590.

The FB-1156 Compressor Station has two (2) 1,340 horsepower (hp) 3516LE
Caterpillar lean burn compressor engines, five (5) 586 hp 3412LE
Caterpillar lean burn compressor engines, and one 1,390 hp 7042GSI
Waukesha rich burn compressor engines. The engines are four-stroke
natural gas-fired engines.  This station compresses field gas for
transmission through pipelines.

These tests were undertaken as part of the annual performance test to
demonstrate compliance with formaldehyde emission limits, annual
nitrogen oxides (NOx) and carbon monoxide (CO) monitoring for the
Caterpillar 3412LE compressor engines, and the quarterly monitoring
requirements for the Waukesha 7042 GSI engine.

Test results for NOx and CO are presented in Table 1, and test results
for formaldehyde are presented in Table 2.  Testing at this site used
EPA Methods 1, 2C, 3, 4, 7E, 10, and 19.  The formaldehyde tests used
acetylacetone (Celanese method CL 8-4) and Fourier Transform Infrared
(FTIR) test methods.  The test report did not indicate that performance
testing was conducted for total hydrocarbons or volatile organic
compounds.  

  



Table 1: NOx and CO Test Results

Unit	Test Date	NOx Tested

(g/hp-hr)	CO Tested

(g/hp-hr)	CO Destruction Efficiency (%)

FB A, Caterpillar 3516LE	6/11/02	0.86	0.12	89

FB B, Caterpillar 3516LE	6/11/02	0.93	0.20	86

FB D, Waukesha 7042GSI	6/11/02	0.94	0.71	NT

SC A, Caterpillar 3412LE	6/11/02	0.56	0.38	83

SC B, Caterpillar 3412LE	6/12/02	0.34	0.36	85

SC C, Caterpillar 3412LE	6/12/02	0.83	0.42	86

SC D, Caterpillar 3412LE	6/12/02	0.88	0.39	87

SC E, Caterpillar 3412LE	6/12/02	0.74	0.41	82

NT:  Not Tested

Table 2: Formaldehyde Test Results

Unit	Test Date	Celanese Run 1A (g/hp-hr)	Celanese Run 1B (g/hp-hr)
Average Celanese

(g/hp-hr)	FTIR Testing 

(g/hp-hr)

FB A, Caterpillar 3516LE	6/11/02	0.008	0.01	0.009	0.01

FB B, Caterpillar 3516LE	6/11/02	0.01	0.08	0.08	0.02

FB D, Waukesha 7042GSI	6/11/02	0.006	0.006	0.006	0.01

SC A, Caterpillar 3412LE	6/11/02	0.05	0.06	0.055	0.05

SC B, Caterpillar 3412LE	6/12/02	0.05	0.006	0.05	0.02

SC C, Caterpillar 3412LE	6/12/02	0.09	0.03	0.06	0.02

SC D, Caterpillar 3412LE	6/12/02	0.12	0.13	0.12	0.02

SC E, Caterpillar 3412LE	6/12/02	0.18	0.08	0.13	0.02



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