Technical Memorandum

innovative environmental solutions, inc.

To: Jaime Pagan/EPA, Melanie King/EPA Date: April 30, 2009

From: Tom McGrath

c: Jim McCarthy, Jeff Panek

Subject: Data used to develop the MACT Floor for gas-fired IC Engines

The tables below include emissions data for gas-fired internal combustion engines extracted from 

the file “Emission Factors from RICE EDB-All HP-All Loads.xls.” The Excel file was provided 

by EPA on 4/29/09. The tabulated data are intended to replicate the MACT floors for 

formaldehyde and carbon monoxide (CO) presented in EPA Docket document EPA-HQ-OAR2008-0708-0006.pdf “Subcategorization and MACT Floor Determination for Stationary

Reciprocating Internal Combustion Engines ≤500 HP at Major Sources.” 

As noted below, I was not able to exactly replicate the MACT Floor for 4SLB units; thus, it 

would be appreciated if you or your subcontractor Alpha-Gamma could review the 4SLB data 

and note discrepancies between the tabulated data below and their analysis. In addition, 

verification of the MACT Floor data for 4SRB and 2SLB engines would be appreciated.

4SRB Gas-Fired IC Engines MACT Floor Data

Table 1 presents the formaldehyde emissions data used to develop the MACT floor for gas-fired 

SI non-emergency 4SRB engines 50 to 500 HP. The MACT floor for this engine subcategory is 

the level achieved by 4SRB engines 50 to 500 HP operating without add-on (i.e. postcombustion) controls. Table 1 has data from 13 tests of engines between 50 and 500 hp. The 

proposed MACT floor is based on the average of the best performing 12% of engines (or 2 tests). 

These data are shaded and result in a MACT floor of 2 ppbvd formaldehyde at 15% O2. 

2SLB Gas-Fired IC Engines MACT Floor Data

Table 2 presents the formaldehyde emissions data used to develop the MACT floor for gas-fired 

SI non-emergency 2SLB engines. The MACT floor for this engine subcategory is the level 

achieved by 2SLB engines 50 to 500 HP operating without add-on (i.e. post-combustion) 

controls. Data from 16 tests of engines between 50 and 500 hp are presented. EPA took the 

average of the best performing 12 percent (or 2 tests) of engines, found the corresponding CO 

tests and averaged those tests as well. These CO data are in Table 3 and the average of these two 

data is the proposed MACT floor of 85 ppmvd of CO at 15 percent O2. 
4SLB Gas-Fired IC Engines MACT Floor Data

Table 4 presents the formaldehyde emissions data used to develop the MACT floor for gas-fired 

SI non-emergency 4SLB engines. The MACT floor for this engine subcategory is the level 

achieved by 4SLB engines 50 to 500 HP operating without add-on (i.e. post-combustion) 

controls. Data from 36 tests of engines greater than 500 hp are presented (Note – Docket 

document EPA-HQ-OAR-2008-0708-0006.pdf references 34 rather than 36 tests). EPA took 

the average of the best performing 12 percent (or 4 tests) of engines, found the corresponding 

CO tests and averaged those tests. These CO data are in Table 5. Only two of the four best 

performing formaldehyde engines had CO emissions data. The average of these two data is 82

ppmvd of CO at 15 percent O2. (Note – Docket document EPA-HQ-OAR-2008-0708-0006.pdf 

lists a MACT floor of 85 rather than 82 ppmv CO at 15% O2). 
Table 1. MACT Floor Formaldehyde Emissions Data for Gas-Fired 4SRB Engines: 50 < hp < 500.

Test 

ID

Engine Specifications Test 

Method

O2 (%) ppb @ 15% O2

Manufacturer Model hp Load Run 1 Run 2 Run 3 Run 1 Run 2 Run 3 Avg 

11.2 Ingersoll Rand 8SVG 440 100% CARB 430 5.0 5.0 5.0 1,247 1,896 1,900 1,681

7.4 Waukesha MM425 54 100% CARB 430 0.3 0.3 0.3 1,756 1,802 2,323 1,960

11.3 Ingersoll Rand 8SVG 440 100% CARB 430 16.7 16.7 16.7 8,596 5,352 5,543 6,497

7.1 NR MM605 60 100% CARB 430 3.3 3.3 3.3 5,793 14,733 1,797 7,441

7.5 NR MM336 77 100% CARB 430 6.0 6.0 6.0 11,060 3,679 8,359 7,699

7.12 Waukesha 1197 208 100% CARB 430 5.7 5.7 5.7 10,752 3,990 8,462 7,735

7.7 Waukesha 1197 208 100% CARB 430 2.7 2.7 2.7 7,894 7,401 8,069 7,788

7.3 Waukesha 1197 159 100% CARB 430 4.6 4.6 4.6 12,296 10,580 9,787 10,888

7.10 Waukesha 145 74 100% CARB 430 7.1 7.1 7.1 13,031 10,795 8,906 10,911

7.11 Waukesha 145 74 100% CARB 430 2.4 2.4 2.4 9,169 11,956 12,090 11,072

7.8 Waukesha 1197 208 100% CARB 430 6.0 6.0 6.0 12,845 17,696 18,694 16,412

7.6 NR MM335 77 100% CARB 430 7.0 7.0 7.0 16,872 17,471 17,225 17,189

7.2 NR MM605 60 100% CARB 430 4.5 4.5 4.5 38,375 35,569 18,125 30,690
Table 2. MACT Floor Formaldehyde Emissions Data for Gas-Fired 2SLB Engines: 50 < hp < 500.

Test ID

Engine Specifications Test 

Method

O2 (%) ppb @ 15% O2

Manufacturer Model hp Load (%) Run 1 Run 2 Run 3 Run 1 Run 2 Run 3 Avg 

CSU-1.4.1 Cooper Bessemer GMB-4VTF 440 95 FTIR 14.70 NR NR 15,333 NR NR 15,333

CSU-1.14.1 Cooper Bessemer GMB-4VTF 440 100 FTIR 14.60 NR NR 15,776 NR NR 15,776

CSU-1.6.1 Cooper Bessemer GMB-4VTF 440 100 FTIR 14.34 NR NR 16,091 NR NR 16,091

CSU-1.1.1 Cooper Bessemer GMB-4VTF 440 100 FTIR 14.6 NR NR 16,693 NR NR 16,693

CSU-1.9.1 Cooper Bessemer GMB-4VTF 440 100 FTIR 14.50 NR NR 16,725 NR NR 16,725

CSU-1.5.1 Cooper Bessemer GMB-4VTF 440 100 FTIR 15.10 NR NR 17,173 NR NR 17,173

CSU-1.10.1 Cooper Bessemer GMB-4VTF 440 100 FTIR 14.63 NR NR 17,369 NR NR 17,369

CSU-1.16.1 Cooper Bessemer GMB-4VTF 440 100 FTIR 14.60 NR NR 18,002 NR NR 18,002

CSU-1.11.1 Cooper Bessemer GMB-4VTF 440 95 FTIR 15.20 NR NR 18,002 NR NR 18,002

CSU-1.13.1 Cooper Bessemer GMB-4VTF 440 100 FTIR 14.60 NR NR 18,166 NR NR 18,166

CSU-1.15.1 Cooper Bessemer GMB-4VTF 440 100 FTIR 14.70 NR NR 18,274 NR NR 18,274

CSU-1.12.1 Cooper Bessemer GMB-4VTF 440 95 FTIR 15.30 NR NR 18,365 NR NR 18,365

CSU-1.8.1 Cooper Bessemer GMB-4VTF 440 95 FTIR 15.60 NR NR 19,021 NR NR 19,021

CSU-1.3.1 Cooper Bessemer GMB-4VTF 440 69 FTIR 16.08 NR NR 22,443 NR NR 22,443

CSU-1.2/7.1 Cooper Bessemer GMB-4VTF 440 68 FTIR 15.8 NR NR 24,112 NR NR 24,112

7.14 Clark MA-4 150 100 CARB 430 14.2 14.2 14.2 33,744 27,704 28,655 30,034

Table 3. MACT Floor Carbon Monoxide Emissions Data for Gas-Fired 2SLB Engines: 50 < hp < 500.

Test ID

Engine Specifications Test 

Method

O2 (%) ppmv @ 15% O2

Manufacturer Model hp Load (%) Run 1 Run 2 Run 3 Run 1 Run 2 Run 3 Avg 

CSU-1.4.1 Cooper Bessemer GMB-4VTF 440 95 FTIR 14.70 NR NR 75 NR NR 75

CSU-1.14.1 Cooper Bessemer GMB-4VTF 440 100 FTIR 14.60 NR NR 95 NR NR 95
Table 4. MACT Floor Formaldehyde Emissions Data for Gas-Fired 24LB Engines: 50 < hp < 500.

Test ID Engine Specifications Test 

Method

O2 (%) ppb @ 15% O2

Manufacturer Model hp Load Run 1 Run 2 Run 3 Run 1 Run 2 Run 3 Avg 

29.33x Cooper Bessemer LSV-16 4,200 98 FTIR 9.6 NR NR ND (326) NR NR ND (326)

3.12 Dresser-Rand KVS-412 2,000 90 CARB 430 9.9 9.9 9.9 2,575 2,575 2,575 2,575

29.41x Ingersoll Rand KVS-412 2,000 91 FTIR 8.3 NR NR 4,683 NR NR 4,683

25.2 Ingersoll Rand KVR 616 5,500 70 CARB 430 13.8 13.75 13.6 3,571 7,274 3,482 4,775

21 Waukesha 7042-GL 1,000 100 CARB 430 9.28 9.30 9.30 12,313 6,709 8,479 9,167

3.7 Dresser-Rand KVS-412 2,000 100 CARB 430 12.1 12.1 12.1 10,057 10,057 10,057 10,057

29.38x Cooper Bessemer LSV-16 4,200 99 FTIR 9.3 NR NR 15,869 NR NR 15,869

29.34x Cooper Bessemer LSV-16 4,200 101 FTIR 9.4 NR NR 15,956 NR NR 15,956

29.37x Cooper Bessemer LSV-16 4,200 98 FTIR 9.5 NR NR 17,131 NR NR 17,131

29.35x Cooper Bessemer LSV-16 4,200 87 FTIR 9.9 NR NR 18,934 NR NR 18,934

29.36x Cooper Bessemer LSV-16 4,200 85 FTIR 11 NR NR 19,667 NR NR 19,667

29.44x Ingersoll Rand KVS-412 2,000 89 FTIR 11.3 NR NR 20,527 NR NR 20,527

29.46x Ingersoll Rand KVS-412 2,000 92 FTIR 11.3 NR NR 25,444 NR NR 25,444

29.51x Ingersoll Rand KVS-412 2,000 87 FTIR 11.1 NR NR 26,670 NR NR 26,670

29.49x Ingersoll Rand KVS-412 2,000 88 FTIR 11.4 NR NR 26,767 NR NR 26,767

29.50x Ingersoll Rand KVS-412 2,000 88 FTIR 11.2 NR NR 27,736 NR NR 27,736

29.45x Ingersoll Rand KVS-412 2,000 82 FTIR 11.4 NR NR 28,444 NR NR 28,444

29.48x Ingersoll Rand KVS-412 2,000 84 FTIR 11.6 NR NR 30,578 NR NR 30,578

29.52x Ingersoll Rand KVS-412 2,000 80 FTIR 11.3 NR NR 30,852 NR NR 30,852

29.47x Ingersoll Rand KVS-412 2,000 85 FTIR 11.5 NR NR 31,006 NR NR 31,006

CSU-2.4.1 Waukesha 3521 GL 736 100 FTIR 9.80 NR NR 33,371 NR NR 33,371

CSU-2.9.1 Waukesha 3521 GL 736 100 FTIR 9.69 NR NR 33,806 NR NR 33,806

CSU-2.6.1 Waukesha 3521 GL 736 100 FTIR 9.10 NR NR 33,833 NR NR 33,833

CSU-2.14.1 Waukesha 3521 GL 736 100 FTIR 9.81 NR NR 33,939 NR NR 33,939

CSU-2.11.1 Waukesha 3521 GL 736 100 FTIR 9.81 NR NR 33,955 NR NR 33,955

CSU-2.1.1 Waukesha 3521 GL 736 100 FTIR 9.80 NR NR 34,128 NR NR 34,128

CSU-2.10.1 Waukesha 3521 GL 736 100 FTIR 9.80 NR NR 34,383 NR NR 34,383
CSU-2.16.1 Waukesha 3521 GL 736 100 FTIR 9.82 NR NR 34,840 NR NR 34,840

CSU-2.3.1 Waukesha 3521 GL 736 70 FTIR 9.81 NR NR 34,960 NR NR 34,960

CSU-2.12.1 Waukesha 3521 GL 736 100 FTIR 9.90 NR NR 34,987 NR NR 34,987

CSU-2.15.1 Waukesha 3521 GL 736 100 FTIR 9.90 NR NR 35,102 NR NR 35,102

CSU-2.2.1 Waukesha 3521 GL 736 70 FTIR 9.82 NR NR 36,637 NR NR 36,637

CSU-2.13.1 Waukesha 3521 GL 736 100 FTIR 10.44 NR NR 36,742 NR NR 36,742

CSU-2.8.1 Waukesha 3521 GL 736 100 FTIR 10.50 NR NR 37,203 NR NR 37,203

CSU-2.7.1 Waukesha 3521 GL 736 70 FTIR 9.20 NR NR 37,907 NR NR 37,907

CSU-2.5.1 Waukesha 3521 GL 736 100 FTIR 10.51 NR NR 42,046 NR NR 42,046

Table 5. MACT Floor Carbon Monoxide Emissions Data for Gas-Fired 4SLB Engines: 50 < hp < 500.

Test ID

Engine Specifications Test 

Method

O2 (%) ppb @ 15% O2

Manufacturer Model hp Load Run 1 Run 2 Run 3 Run 1 Run 2 Run 3 Avg 

29.33x Cooper Bessemer LSV-16 4,200 98 FTIR 9.6 NR NR 106 NR NR 106

3.12 Dresser-Rand KVS-412 2,000 90 CARB 430 9.9 9.9 9.9 No Data

29.41x Ingersoll Rand KVS-412 2,000 91 FTIR 8.3 NR NR 59 NR NR 59

25.2 Ingersoll Rand KVR 616 5,500 70 CARB 430 13.8 13.75 13.6 No Data