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-OAR-2008-0708-0006.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. post-combustion)
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



 

