92.124 Test sequence; general requirements.§ 92.124 Test sequence; general requirements.
(a) Air temperature. (1) The temperature of dilution air for the particulate sample dilution tunnel shall comply with the requirements of § 92.114 throughout the test sequence.
(2) For the testing of locomotives and engines, the ambient (test cell or out-of-door) air temperature, the temperature of the engine intake air, and the temperature of the air which provides cooling for the engine charge air cooling system shall be between 45 °F (7 °C) and 105 °F (41 °C) throughout the test sequence. Manufacturers and remanufacturers may test at higher temperatures without approval from the Administrator, but no corrections are allowed for the deviations from test conditions.
(b) For the testing of locomotives and engines, the atmospheric pressure shall be between 31.0 inches Hg and 26.0 inches Hg throughout the test sequence. Manufacturers and remanufacturers may test at lower pressures without approval from the Administrator, but no corrections are allowed for the deviations from test conditions.
(c) No control of humidity is required for ambient air, engine intake air or dilution air.
(d) Flow restrictions - (1) Locomotive testing. Restrictions to the flow of air into the engine and of exhaust out of the engine shall be those inherent to the locomotive. No adjustments or changes shall be made to these parameters. The temperature of the inlet fuel to the engine shall not exceed 125 °F.
(2) Engine testing. (i) Air inlet and exhaust restrictions shall be set to represent the average restrictions which would be seen in use in a representative application.
(ii) Inlet depression and exhaust backpressure shall be set with the engine operating at rated speed and maximum power, i.e., throttle notch 8.
(iii) The locations at which the inlet depression and exhaust backpressure are measured shall be specified by the manufacturer or remanufacturer.
(iv) The settings shall be made during the preconditioning.
(e) Pre-test engine measurements (e.g., idle and throttle notch speeds, fuel flows, etc.), pre-test engine performance checks (e.g., verification of engine power, etc.) and pre-test system calibrations (e.g., inlet and exhaust restrictions, etc.) can be done during engine preconditioning, or at the manufacturer's convenience subject to the requirements of good engineering practice.
(f) The required test sequence is described in Table B124-1 of this section, as follows:
|Test sequence for locomotives and locomotive engines|
|Mode No.||Notch setting||Time in notch||Emissions measured 2||Power,
|Warmup||Notch 8||5 ±1 min||None||None|
|Warmup||Lowest Idle||15 min maximum (after engine speed reaches lowest idle speed)||None||None|
|1a||Low Idle 1||6 min minimum||All||Both|
|1||Normal Idle||6 min minimum||All||Both|
|2||Dynamic Brake 1||6 min minimum||All||Both|
|3||Notch 1||6 min minimum||All||Both|
|4||Notch 2||6 min minimum||All||Both|
|5||Notch 3||6 min minimum||All||Both|
|6||Notch 4||6 min minimum||All||Both|
|7||Notch 5||6 min minimum||All||Both|
|8||Notch 6||6 min minimum||All||Both|
|9||Notch 7||6 min minimum||All||Both|
|10||Notch 8||15 min minimum||All||Both|
1 Omit if not so equipped.
2 The EPA test sequence for locomotives and locomotive engines may be performed once, with gaseous, particulate and smoke measurements performed simultaneously, or it may be performed twice with gaseous, and particulate measurements performed during one test sequence and smoke measurements performed during the other test sequence. The minimum time in notch is three minutes for test sequences in which only smoke is measured.