R 336.1841

R 336.1841 RACT emission limitations for engines.

Last amended: 2025Year: 2026Length: 1,511 wordsOfficial source

Cite as Mich. Admin. Code R 336.1841

Rule 841. (1) As used in this rule: (a) “Certified engine operating in a non-certified manner” means an engine not operated and maintained according to the manufacturer's emission-related written instructions or if no manufacturer emission-related instructions were provided. (b) “Engine” means any reciprocating internal combustion engine that uses reciprocating motion to convert heat energy into mechanical work and is not mobile. An engine test cell or engine test stand and any associated apparatus are not considered engines for the purpose of this rule. (2) A person is subject to this rule and shall not cause or allow the emission of NOx from the combustion of fuels in an engine or its replacement unit in excess of the requirements of this rule at facilities meeting either of the following criteria: (a) Located in the 2015 ozone nonattainment areas and either of the following: (i) A stationary source with a potential to emit of 100 tons per year or greater of NOx from all combined NOx sources upon the effective date of this rule. (ii) Any engine manufactured after the effective date of this rule. (b) Has at any time been subject to the requirements of this rule or becomes subject as part of a normal maintenance program that meets the exemption requirements of R 336.1285(2)(a)(vi). The requirements in this rule, at a minimum, must permanently apply regardless of any change in the attainment or maintenance status of the stationary source location or the potential to emit of the stationary source, when the engine is located at the stationary source. (3) Engines may utilize the following exemptions from all provisions of this rule except subrule (6)(d). If an exemption is utilized, all applicable requirements of R 336.1846 must be met. All provisions of this rule apply if the engine is not utilizing an exemption listed below: (a) Engines less than 300 horsepower, HP. (b) Emergency engines as described in 40 CFR 63.6640(f) and 63.6675. (c) Engines subject to federal regulations under 40 CFR part 60, 40 CFR part 61, or 40 CFR part 63, if the applicable regulations are included in the SIP and have equivalent standards established to be equal to or more stringent than the requirements and limits of subrule (4) of this rule. (d) Engines used for research and development. (e) Engines with a federally enforceable limit of 100 hours per 12-month rolling time period. (f) Black start engines whose only purpose is to start up combustion turbines and all associated equipment. (4) Except as allowed by R 336.1845 or as required by subrule (7) of this rule, a person that generates NOx emissions from the use of an engine shall meet the following limits within table 841 on and after the effective date of this rule, as applicable: TABLE 841 NOx emission limits for internal combustion engines. Engine type Grams of NOx per brake horsepower-hour Any engine from 300 HP to 500 HP N/A Compression ignition Greater than 500 HP 3 Spark ignition, natural gas burning engines 2 stroke greater than 500 HP 4 stroke from 500 HP to 1000 HP 4 stroke greater than 1000 HP 3 3 1.5 Spark ignition greater than 500 HP using gaseous fuels other than natural gas 3 (5) Compliance and monitoring with this rule must be determined using 1 of the following methods: (a) Maintain engine certification according to procedures specified in 40 CFR part 60, subpart IIII, JJJJ, or ZZZZ, as applicable, for the same model year which includes, but is not limited to: (i) Operate and maintain the certified engine and, if applicable, control device according to the manufacturer's emission-related written instructions. (ii) Use diesel fuel with a sulfur content not to exceed 15 parts per million or natural gas, as applicable. (b) For a non-certified engine or a certified engine operating in a non-certified manner, a person subject to this rule shall meet the following requirements: (i) Create and implement an approvable maintenance plan for the engine. The plan must contain, at a minimum, the maintenance requirements of 40 CFR part 63, subpart ZZZZ, which includes, among other requirements, the conditions of inspection, the frequency of inspections, operating parameters to be monitored and their normal operating ranges, major replacement parts that must be maintained in inventory and a description of corrective procedures or operational changes that must be taken in the event of a malfunction or failure to comply with applicable emission limits. (ii) To the extent practicable, maintain and operate the engine in a manner consistent with good air pollution control practice for minimizing emissions at all times, including during startup, shutdown, and malfunction. The department shall determine compliance with this requirement based on information that may include, but is not limited to, monitoring results and review of operation and maintenance procedures and records. (iii) For emission units subject to an emission rate limit specified in subrule (4) of this rule, compliance must be determined by 1 of the following: (A) If a performance test has not been done within the last 18 months before the effective date of this rule, the person subject to this rule shall conduct an initial performance test, acceptable to the department, to demonstrate the required emission rate limit within 180 days after the effective date of this rule, or within 30 days after startup if the unit is not operating. An acceptable performance test must then be completed every 24 months, from the date of the last test, consistent with the requirements of R 336.2004. The 24-month frequency may be increased to once every 5 years when the most recent test results are 75% of the limit and the source certifies no other tests or information indicates a value over 75% of the limit. (B) The person subject to this rule shall submit to the department for approval a monitoring plan describing how the NOx emissions shall be monitored. The monitoring plan must include how the performance of periodic monitoring is sufficient to yield reliable data from relevant time periods representative of the source’s compliance with the emission rates specified in subrule (4) of this rule. The periodic monitoring may include the following: (I) Performance test results consistent with the requirements of R 336.2004, or portable monitors using ASTM D6522, adopted by reference in R 336.1902. The protocol must be submitted as required under R 336.2001. (II) A parametric monitoring program that specifies operating parameters and ranges providing reasonable assurance that each engine’s emissions are consistent with the requirements of this rule. (III) A predictive emissions measurement system that relies on automated data collection from instruments. (IV) A continuous emission monitoring system that complies with 40 CFR part 60 or part 75, both adopted by reference in R 336.1902. (6) A person subject to this rule shall obtain current information and maintain records for all requirements or exemptions in sufficient detail to determine compliance. The information and records must be made available to the department upon request. The information and records must, at a minimum, include the following: (a) The installation date of the engine. (b) For non-certified engines or certified engines operating in a non-certified manner, the following: (i) The maintenance plan. (ii) All associated maintenance records for a minimum of 5 years. (iii) Either the results of the most recent stack test or a minimum of 5 years of all monitoring data necessary to demonstrate compliance with the limits and requirements in subrule (4) of this rule, or both, as applicable. (iv) The manufacture date, if available. (c) For certified engines, documentation from the manufacturer that the engine is certified to meet the emission standards and the manufacture date. (d) If the provisions of this rule are not applicable as allowed by subrule (3), all information necessary to demonstrate that the equipment meets the exemption being utilized. (7) If records are not requested by the department for any 3-year rolling period, the facility will submit a report to the department with information and records in sufficient detail to determine compliance with the limits in this rule. (8) A person that generates NOx emissions from the use of an engine located in the 2015 ozone nonattainment area shall meet the following limits within table 841a 12 months after the effective date of a final determination by the USEPA, under section 182(c)(9) of the clean air act, 42 USC 7511a, for either of the following elements of the 2015 ozone National Ambient Air Quality Standard: (a) The USEPA makes a determination that reasonable further progress as described in Michigan’s approved state implementation plan was not achieved. (b) The USEPA makes a determination that the area failed to attain the standard by the applicable attainment date. TABLE 841a NOx emission limits for internal combustion engines. Engine type Grams of NOx per brake horsepower-hour Compression Ignition Greater than 500 HP 2.5 Spark ignition, natural gas burning engines 2 stroke greater than 500 HP 4 stroke from 500 HP to 1000 HP 4 stroke greater than 1000 HP 2.5 2.5 1.0 Spark Ignition greater than 500 HP using landfill, digester, or other gaseous fuels 2.5
R 336.1841: R 336.1841 RACT emission limitations for engines. | Justis AI