View Source

40 C.F.R. § 1066.605

Mass-based and molar-based exhaust emission calculations.

§ 1066.605 Mass-based and molar-based exhaust emission calculations.

(a) Calculate your total mass of emissions over a test cycle as specified in paragraph (c) of this section or in 40 CFR part 1065, subpart G, as applicable.

(b) See the standard-setting part for composite emission calculations over multiple test intervals and the corresponding weighting factors.

(c) Perform the following sequence of preliminary calculations to correct recorded concentration measurements before calculating mass emissions in paragraphs (e) and (f) of this section:

(1) For vehicles above 14,000 pounds GVWR, correct all THC and CH4 concentrations for initial contamination as described in 40 CFR 1065.660(a), including continuous readings, sample bag readings, and dilution air background readings. This correction is optional for vehicles at or below 14,000 pounds GVWR.

(2) Correct all concentrations measured on a “dry” basis to a “wet” basis, including dilution air background concentrations.

(3) Calculate all NMHC and CH4 concentrations, including dilution air background concentrations, as described in 40 CFR 1065.660.

(4) For vehicles at or below 14,000 pounds GVWR, calculate HC concentrations, including dilution air background concentrations, as described in this section, and as described in § 1066.635 for NMOG. For emission testing of vehicles above 14,000 pounds GVWR, with fuels that contain 25% or more oxygenated compounds by volume, calculate THCE and NMHCE concentrations, including dilution air background concentrations, as described in 40 CFR part 1065, subpart I.

(5) Correct all gaseous concentrations for dilution air background as described in § 1066.610.

(6) Correct NOX emission values for intake-air humidity as described in § 1066.615.

(7) Correct all PM filter masses for sample media buoyancy as described in 40 CFR 1065.690.

(d) Calculate g/mile emission rates using the following equation unless the standard-setting part specifies otherwise:

er25oc16.257.gif

Where:

e[emission] = emission rate over the test interval. m[emission] = emission mass over the test interval. D = the measured driving distance over the test interval.

Example:

mNOx = 0.3177 g DHFET = 10.19 miles
er25oc16.258.gif

(e) Calculate the emission mass of each gaseous pollutant using the following equation:

er25oc16.259.gif

Where:

m[emission] = emission mass over the test interval. Vmix = total dilute exhaust volume over the test interval, corrected to standard reference conditions, and corrected for any volume removed for emission sampling and for any volume change from adding secondary dilution air. p[emission] = density of the appropriate chemical species as given in § 1066.1005(f). x[emission] = measured emission concentration in the sample, after dry-to-wet and background corrections. c = 10−2 for emission concentrations in %, and 10−6 for emission concentrations in ppm.

Example:

Vmix = 170.878 m (from paragraph (f) of this section) rNOx = 1913 g/m xNOx = 0.9721 ppm c = 10−6mNOx = 170.878·1913·0.9721·10−6 = 0.3177 g

(f) Calculation of the emission mass of PM, mPM, is dependent on how many PM filters you use, as follows:

This document is only available to subscribers. Please log in or purchase access.
Purchase Login

About SCCE

The Society of Corporate Compliance and Ethics (SCCE) is a non-profit, member-based professional association. SCCE supports our members' work with education, news, and discussion forums. We are a community of leaders, defining and shaping the corporate compliance environment across a wide range of industries and geographic regions. In developing and maintaining effective ethics and compliance programs, our members strengthen and protect their companies.

952.933.4977

About HCCA

The Health Care Compliance Association (HCCA), is a 501(c)6 non-profit, member-based professional association. HCCA was established in 1996 and is headquartered in Minneapolis, MN. We provide training, certification, and other resources to over 10,000 members. Our members include compliance officers and staff from a wide range of organizations, including hospitals, research facilities, clinics and technology service providers.

952.988.0141

Facebook X LinkedIn
Copyright © 2024 by Society of Corporate Compliance and Ethics (SCCE) & Health Care Compliance Association (HCCA). No claim to original US Government works. All rights reserved. All information provided through this site, including without limitation all information such as the “look and feel” of the site, data files, graphics, text, photographs, drawings, logos, images, sounds, music, video or audio files on this site, is owned and/or licensed by SCCE & HCCA or its suppliers and is subject to United States and international copyright, trademark and other intellectual property laws. Any third party logos and/or content provided herein is owned by such third parties and is used by permission herein. Your use of this site to is subject to our Terms Of Use and Privacy Statement.
Cookie settings