API Publ 4681:1999 pdf download.Fugitive Emissions From Refinery Process Drains Volume III
Emissions from refinery process drains are under increased regulatory scrutiny, particularly with respect to volatile organic compounds (VOCs) and hazardous air pollutants (HAPS), pursuant to the Clean Air Act Amendments of 1990. Emissions from refinery process drains are currently estimated in the industry using EPAs AP-42 factor of 0.070 Ib/hr of total non-methane hydrocarbons. There have been significant design modifications to refinery process drains over the years since the AP-42 factor was first developed. The design changes have resulted in significant emission reductions from process drains, and the AP-42 factor is now considered obsolete because it over-predicts emission rates in many cases. The American Petroleum Institute (API) funded a project to develop a mathematical model that predicts acceptably accurate emissions from refinery process drains. A mechanistic model was developed to predict VOC and HAP emission rates from process drains based on mass transfer fundamentals and conservation of mass. The mechanistic model accounts for emissions that may occur as the process wastewater is discharged from a pipe nozzle to the drain hub, emissions from the surface of a water seal, if present, and emissions from wastewater falling from the leg of the process drain into water conveyed in the underlying collection channel. API initiated a project to incorporate the mechanistic model for refinery process drains into a suite of procedures for estimating emissions from refinery process drains resulting in a user- friendly software tool called APIDRAIN. In addition to the mass transfer mechanistic model, APIDRAIN also offers two other options for estimating emissions from process drains. They include (I) emission factors, and (2) correlation equations. Each calculation option requires considerably different input information.
Double-click on the setup.exe file to activate the installation program. A dialog box appears with development information, with a prompt to continue; click OK to proceed. A second dialog box next appears offering the user two choices, either to proceed with the installation or to exit the installation. The user should click on the install option and OK to proceed. The installation next prompts the user to declare the drive on which to install the model; this will usually be the local hard drive root directory (C:). Click on OK to accept the selected drive. The installation program then prompts the user to define the directory name for the APIDRAIN files. By default, the installation will create a directory called “APIDRAIN” at the root directory. The user may accept this by clicking on the OK box, or if desired, modify the name of the directory, using up to eight characters, prior to accepting. At the completion of the installation, a dialog box appears with address and contact information about the developer (Enviromega Inc.) regarding technical assistance or bug reporting.
API Publ 4681:1999 pdf download
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