[Code of Federal Regulations]
[Title 40, Volume 18]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR92.126]
[Page 458-459]
TITLE 40--PROTECTION OF ENVIRONMENT
CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
PART 92--CONTROL OF AIR POLLUTION FROM LOCOMOTIVES AND LOCOMOTIVE ENGINES--
Table of Contents
Subpart B--Test Procedures
Sec. 92.126 Test run.
(a) The following steps shall be taken for each test:
(1) Prepare the locomotive, engine, dynamometer, (as applicable) and
sampling system for the test. Change filters, etc. and leak check as
necessary.
(2) Connect sampling equipment as appropriate for the sampling
procedure employed; i.e. raw or dilute (evacuated sample collection
bags, particulate, and raw exhaust sampling equipment, particulate
sample filters, fuel flow measurement equipment, etc.).
(3) Start the particulate dilution tunnel, the sample pumps, the
engine cooling fan(s) (engine dynamometer testing) and the data
collection and sampling systems (except particulate sample collection).
The heated components of any continuous sampling systems(s) (if
applicable) shall be preheated to their designated operating
temperatures before the test begins.
(4) Adjust the sample flow rates to the desired flow rates and set
gas flow measuring devices to zero (particulate dilution tunnel).
(5) Read and record all required general and pre-test data (i.e.,
all required data other than data that can only be collected during or
after the emission test).
(6) Warm-up the locomotive or locomotive engines according to normal
warm-up procedures.
(7) Begin the EPA Test Sequence for Locomotives and Locomotive
Engines (see Sec. 92.124). Record all required general and test data
throughout the duration of the test sequence.
(i) Mark the start of the EPA Test Sequence for Locomotives and
Locomotive Engines on all data records.
(ii) Begin emission measurement after completing the warmup phase of
the EPA Test Sequence for Locomotives and Locomotive Engines, as
specified in paragraph (b) of this section. Mark the start and end of
each mode on all data records.
(iii) A mode shall be voided where the requirements of this subpart
that apply to that test mode are not met. This includes the following:
(A) The data acquisition is terminated prematurely; or
(B) For engine testing, the engine speed or power output exceeds the
tolerance bands established for that mode; or
(C) Measured concentrations exceed the range of the instrument; or
(D) The test equipment malfunctions.
(iv) Modes within the test sequence shall be repeated if it is
voided during the performance of the test sequence. A mode can be
repeated by:
(A) Repeating the two preceding modes and then continuing with the
test sequence, provided that the locomotive or engine is not shut down
after the voided test mode; or
[[Page 459]]
(B) Repeating the preceding mode and then continuing with the test
sequence from that point, provided that the locomotive or engine is not
operated in any mode with lower power than the preceding mode after the
voided test mode. For example, if the Notch 2 mode is voided, then the
locomotive or engine would be returned to Notch 1 while any repairs are
made.
(b) Sampling and measurement timing. (1) Gaseous emissions shall be
sampled and measured continuously.
(2)(i) Sampling of particulate emissions from the raw exhaust (for
dilution) shall be conducted continuously.
(ii) Sampling of particulates from the diluted exhaust shall begin
within ten seconds after the beginning of each test mode, and shall end
six minutes after the beginning of each test mode.
(iii) Sampling of CO2 in the dilution air and diluted
exhaust does not need to be continuous, but the measurements used for
the calculations must be made after the first two minutes of each mode.
(3) Fuel flow rate shall be measured continuously. The value
reported for the fuel flow rate shall be a one-minute average of the
instantaneous fuel flow measurements taken during the last minute of the
minimum sampling period listed in Table B124-1 in Sec. 92.124; except
for testing during idle modes, where it shall be a three-minute average
of the instantaneous fuel flow measurements taken during the last three
minutes of the minimum sampling period listed in Table B124-1 in
Sec. 92.124. Sampling periods greater than one minute, but no greater
than three minutes are allowed for modes 2, 3, and 4, where required by
good engineering practice.
(4) Engine power shall be measured continuously. The value reported
for the engine power shall be a one-minute average of the instantaneous
power measurements taken during the last minute of the minimum sampling
period listed in Table B124-1 in Sec. 92.124.
(c) Exhaust gas measurements. (1) Should the analyzer response
exceed 100 percent of full scale or respond less than 15 percent of full
scale, the next higher or lower analyzer range shall be used.
(2) Each analyzer range that may be used during a test sequence must
have the zero and span responses recorded prior to the execution of the
test sequence. Only the range(s) used to measure the emissions during a
test sequence are required to have their zero and span recorded after
the completion of the test sequence.
(3) It is permitted to change filter elements between test modes,
provided such changes do not cause a mode to be voided.
(4) A leak check is permitted between test modes, provided such
changes do not cause a mode to be voided.
(5) A hang-up check is permitted between test modes, provided such
changes do not cause a mode to be voided.
(6) If, during the emission measurement portions of a test, the
value of the gauges downstream of the NDIR analyzer(s) differs by more
than 2 inches of water from the pretest value, the test is
void.
(7)(i) For bag samples, as soon as possible transfer the exhaust and
dilution air bag samples to the analytical system and process the
samples.
(ii) A stabilized reading of the exhaust sample bag on all
applicable analyzers shall be made within 20 minutes of the end of the
sample collection phase of the mode.