survey (2).doc - RMB Consulting Research Inc 5104 Bur Oak...

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RMB Consulting & Research, Inc. 5104 Bur Oak Circle Phone: (919) 510-5102 Raleigh, North Carolina 27612 Fax: (919) 510-5104 August 2, 2001 Re: Rectangular Duct Flow Monitoring Survey To Whom It May Concern: In 1999, EPA promulgated new stack flow method revisions that were meant to address a number of the inherent bias issues related to EPA’s standard S-type Pitot stack flow reference method (Method 2). One of the revisions was Reference Method 2H, which was designed to allow sources to adjust their flow data to account for wall-effects (i.e., the velocity drop-off at the stack wall due to viscous shear that the equal area traverse method does not address). Reference Method 2H allows utilities to perform tests to determine wall-effect adjustment factors and also incorporates default correction factors, albeit very conservative ones, that can be used without testing. Unfortunately, Method 2H can currently only be used on circular stacks. No wall-effect corrections are allowed for volumetric flow meters installed on rectangular ducts or stacks.
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Christopher Reinemann
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