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Wall-Effects Credit For Rectangular Ducts (06/01/99)

The newly proposed EPA Reference Method 2H allows utilities to perform tests to determine wall-effect credits for correcting the measured volumetric flow rate. The method also incorporates default correction factors, albeit very conseravtive ones, that can be used without testing (1% for rough wall stacks and 0.5% for smooth wall stacks and ducts). Method 2H, however, is only applicable to circular stacks. If the volumetric flow meters are installed on rectangular ducts or stacks, no wall-effect credit is allowed.

RMB has been asked by several utilities to pull together a group of interested utilities to fund a project to provide information to EPA on rectangular duct wall-effects. The objective will be to obtain, at a minimum, the use of the default wall-effect correction factors. If we can obtain 5-6 funding utilities the cost should be low for each individual utility.

If you have flow monitors on rectangular ducts or stacks and are interested in participating in this project, please contact Richard McRanie at 919-510-0483 or E-mail at mcranie@rmb-consulting.com.

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RMB Consulting & Research, Inc.
Last Revised: June 01, 1999