summary of natural gas compressor engine requirements in the General Permits issued by Texas


Texas
From Table 6 of the Standard Permit for Oil and Gas Handling and Production Facilities (p. 41)
(note: limits apply "under this Standard Permit," leaving open the possibility that different standards may apply under a normal permit)

rich-burn engines (spark-ignited)
.LT.100 bhp.GE.100 bhp.GE.240 bhp
TexasJJJJTexasJJJJTexasJJJJ
NOx
(g/bhp-hr)		no std.(1)mfg. bef. 2011: 2.0
mfg. aft. 2010: 1.0
aft. 2014: 0.5 if .GE. 240 bhp*;
aft. 2017: 0.5 if .GE. 100 bhp*;
regardless of mfg. date
( * available one-year grace period)		nothing smaller than 0.7 in Table 1 aft. 2014: 0.5*
regardless of mfg. date
( * available one-year grace period)
CO
(g/bhp-hr)		no std.(1)3.03.0
VOC
(g/bhp-hr)		no std.(1)mfg. bef. 2011: no std.
mfg. aft. 2010: 1.0		mfg. bef. 2011: no std.
mfg. aft. 2010: 1.0


lean-burn engines
2-stroke spark-ignited4-stroke spark-ignited and dual-fuel
.LT.500 bhp.GE.500 bhp.LT.500 bhp.GE.500 bhp
TexasJJJJTexasJJJJTexasJJJJTexasJJJJ
NOx
(g/bhp-hr)		no std.(1)mfg bef. Sept. 23, 1982: 8.0
mfg bef. June 18, 1992 and .LT. 825 hp: 8.0
mfg aft. Sept. 23, 1982 and bef. June 18, 1992 and .GE. 825 hp: 5.0
aft. June 18, 1992 and bef. July 1, 2010: 2.0 except that under conditions of reduced speed and 80-100% of full torque, may be 5.0
mfg aft. June, 2010: 1.0		 mfg bef. July, 2008: no std.
aft. June, 2008: 2.0		mfg. bef. Sept. 23, 1982: 5.0 except that under conditions of reduced speed and 80-100% of full torque, may be 8.0
CO
(g/bhp-hr)		no std.(1)3.03.03.0
VOC
(g/bhp-hr)		no std.(1)mfg bef. July, 2010: no std.
mfg aft. June, 2010: 1.0		mfg bef. July, 2008: no std.
mfg aft. June, 2008: 1.0		mfg bef. July, 2010: no std.
mfg aft. June, 2010: 1.0


note: italic red text represents Texas standards more stringent than the federal equivalent; bold blue text represents Texas standards that are at least in some circumstances less stringent than the federal equivalent.
Note that Table 1 of JJJJ offers the option of complying with limits in ppmvd at 15% O2.
(1) doesn't matter for my purposes, inasmuch as I only care about cases where Texas is more stringent (since JJJJ always serves as the minimum allowable standard). (Does the Standard Permit explicitly say that JJJJ applies where the SP is silent?)
(2) the CO column in Table 1 to Subpart JJJJ contains a mixture of 2.0 and 4.0 entries, depending on engine power and date of manufacture. Hence 3.0 in the Texas SP is more stringent in some cases and less in others.





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dkt
4/14/15