[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: 40CFR92.125]

[Page 457-458]
 
                   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. 92.125  Pre-test procedures and preconditioning.

    (a) Locomotive testing. (1) Determine engine lubricating oil and 
coolant levels and fill as necessary to manufacturers recommended full 
levels.
    (2) Connect fuel supply system and purge as necessary; determine 
that the fuel to be used during emission testing is in compliance with 
the specifications of Sec. 92.113.
    (3) Install instrumentation, engine loading equipment and sampling 
equipment as required.
    (4) Operate the engine until it has reached the specified operating 
temperature.
    (b) Engine testing. (1) Determine engine lubricating oil level and 
fill as necessary to manufacturers recommended full level.
    (2)(i) Connect fuel supply system and purge as necessary; determine 
that the fuel to be used during emission testing is in compliance with 
the specifications of Sec. 92.113.
    (ii) Connect engine cooling system.
    (3) Install instrumentation, and sampling equipment as required. 
Couple the engine to the dynamometer or locomotive alternator/generator.
    (4) Start cooling system.
    (5) Operate the engine until it has reached the specified operating 
temperature.
    (6) Establish that the temperature of intake air entering the engine 
after compression and cooling in the charge air cooler(s), at each test 
point, is within 5  deg.F of the temperatures which occur in 
locomotive operations at the ambient temperature represented by the 
test.
    (c) Both locomotive and engine testing. (1) Allow a minimum of 30 
minutes warm-up in the stand-by or operating mode prior to spanning the 
analyzers.
    (2) Replace or clean filter elements (sampling and analytical 
systems) as necessary, and then vacuum leak check the system, 
Sec. 92.118. A pressure leak check is also permitted per Sec. 92.118. 
Allow the heated sample line, filters, and pumps to reach operating 
temperature.
    (3) Perform the following system checks:
    (i) If a stainless steel NO2 to NO converter is used, 
purge the converter with air (zero-grade air, room air, or 
O2) for a minimum of 30 minutes. The converter must be at 
operational temperature while purging.
    (ii) Check the sample system temperatures (see Sec. 92.114).
    (iii) Check the system response time (see Sec. 92.118). System 
response time may be applied from the most recent check of response time 
if all of the following are met:
    (A) The flow rate for each flow meter is equal to or greater than 
the flow rate recorded in Sec. 92.118.
    (B) For analyzers with capillaries, the response time from the 
sample/span valve is measured using in-use pressures and bypass flows 
(see Sec. 92.118).

[[Page 458]]

    (C) The response time measured in step in paragraph (c)(3)(iii)(B) 
of this section is equal to or less than the slowest response time 
determined for Capillary flow analyzers in Sec. 92.118 plus 2 seconds.
    (iv) A hang-up check is permitted.
    (v) A converter-efficiency check is permitted. The check need not 
conform to Sec. 92.121. The test procedure may be aborted at this point 
in the procedure in order to repair the NO2 to NO converter. 
If the test is aborted, the converter must pass the efficiency check 
described in Sec. 92.121 prior to starting the test run.
    (4) Introduce the zero-grade gases at the same flow rates and 
pressures used to calibrate the analyzers and zero the analyzers on the 
lowest anticipated range that will be used during the test. Immediately 
prior to each test, obtain a stable zero for each anticipated range that 
will be used during the test.
    (5) Introduce span gases to the instruments under the same flow 
conditions as were used for the zero gases. Adjust the instrument gains 
on the lowest range that will be used to give the desired value. Span 
gases should have a concentration greater than 70 percent of full scale 
for each range used. Immediately prior to each test, record the response 
to the span gas and the span-gas concentration for each range that will 
be used during the test.
    (6) Check the zero responses. If they have changed more than 0.5 
percent of full scale, repeat paragraphs (c)(4) and (5) of this section.
    (7) Check system flow rates and pressures. Note the values of gauges 
for reference during the test.