[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: 40CFR94.109]

[Page 611]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 94--CONTROL OF EMISSIONS FROM MARINE COMPRESSION-IGNITION ENGINES--
Table of Contents
 
                       Subpart B--Test Procedures
 
Sec. 94.109  Test procedures for Category 3 marine engines.

    (a) Gaseous emissions shall be measured using the test cycles and 
procedures specified by Section 5 of the Annex VI Technical Code 
(incorporated by reference in Sec. 94.5), except as otherwise specified 
in this paragraph (a).
    (1) The inlet air and exhaust restrictions shall be set at the 
average in-use levels.
    (2) Measurements are valid only for sampling periods in which the 
temperature of the charge air entering the engine is within 3  deg.C of 
the temperature that would occur in-use under ambient conditions 
(temperature, pressure, and humidity) identical to the test conditions. 
You may measure emissions within larger discrepancies, but you may not 
use those measurements to demonstrate compliance.
    (3) Engine coolant and engine oil temperatures shall be equivalent 
to the temperatures that would occur in-use under ambient conditions 
identical to the test conditions.
    (4) Exhaust flow rates shall be calculated using measured fuel flow 
rates.
    (5) Standards used for calibration shall be traceable to NIST 
standards. (Other national standards may be used if they have been shown 
to be equivalent to NIST standards.)
    (6) Certification tests may be performed at any representative 
pressure and humidity levels. Certification tests may be performed at 
any ambient air temperature from 13  deg.C to 30  deg.C and any charge 
air cooling water temperature from 17  deg.C to 27  deg.C. These limits 
apply instead of the limits specified in section 5.2.1 of the Annex VI 
Technical Code. Correct emissions for test conditions using the 
corrections specified in section 5.12.3 of the Annex VI Technical Code.
    (7) Test cycles shall be denormalized based on the maximum test 
speed described in Sec. 94.107.
    (b) Analyzers meeting the specifications of either 40 CFR part 86, 
subpart N, or ISO 8178-1 (incorporated by reference in Sec. 94.5) shall 
be used to measure THC and CO.
    (c) The Administrator may specify changes to the provisions of 
paragraph (a) of this section that are necessary to comply with the 
general provisions of Sec. 94.102.

[68 FR 9785, Feb. 28, 2003]