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Implementing Rectangular Duct Wall Effects (CTM-041)

Implementing Rectangular Duct Wall Effects (CTM-041). John Schakenbach, USEPA Steve Norfleet, RMB Consulting & Research, Inc. EPRI CEM User Group Milwaukee, WI May 4-6, 2004. What is CTM-041?.

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Implementing Rectangular Duct Wall Effects (CTM-041)

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  1. Implementing Rectangular Duct Wall Effects (CTM-041) John Schakenbach, USEPA Steve Norfleet, RMB Consulting & Research, Inc. EPRI CEM User Group Milwaukee, WI May 4-6, 2004

  2. What is CTM-041? • CTM-041 is an optional conditional test method to account for wall effects in rectangular ducts or stacks

  3. What’s a Conditional Test Method? • A CTM has been evaluated by EPA, but is not published in the Code of Federal Regulations • Must be approved by EPA before being used to meet Parts 60, 61, 63 or 75 • May be used by, e.g., Title V permits and SIPs with EPA oversight and public notice and comment • EPA staff may not be the technical experts • Additional info at: www.epa.gov/ttn/emc, then click on Methods

  4. What is a Rectangular Duct Wall Effect? • Velocity decreases to zero at duct wall • More wall effects than circular stack due to higher circumference to cross-sectional area ratio

  5. Why is This a Problem? • Neither Method 2 nor 2H account for these wall effects; may cause overreporting of emissions

  6. How Do I Use CTM-041? • DR or AAR submits a one time written request to EPA (for address, go to: www.epa.gov/airmarkets, click on Recent Additions near top left corner, and scroll to December 18, 2003) • Request may cover all units for which DR/AAR is responsible

  7. How Do I Use CTM-041? • Request must contain: • Plant name • Unit ID • Stack/pipe ID • ORISPL # • Wall effects start date and time

  8. How Do I Use CTM-041? • Part 75 or NOx SIP Call units may provisionally apply CTM-041 retroactively to Jan 1 of the year CTM-041 is performed, but no earlier than Jan 1, 2004. If necessary, EDRs may be resubmitted. • All EPA approvals will be conditioned: “The rectangular duct cross-sectional area may not be adjusted to account for any build-up of particulate matter or other material in the bottom of the duct when calculating stack gas volumetric flow.”

  9. Get Detailed Info • www.epa.gov/airmarkets, then click on “Recent Additions” near top left corner and scroll to February 2, 2004 and December 18, 2003 • A copy of CTM-041 • General info on conditional test methods • Where to send the request to use CTM-041 • Detailed EDR reporting instructions • Spreadsheets • Most recent version of MDC software (v 4.2.46) to QA data

  10. Summary of CTM-041 • May use site-specific default WAF, or • May make wall effects measurements and calculate average WAF using 3 or more test runs • The run (for default) or 3 run average (for measured) used to calculate a WAF must have same number of Method 1 traverse points as is used in the most recent flow monitor RATA • Not load level dependent • Not necessarily connected with a RATA • WAF entered as correction to cross-sectional area • During RATA, WAF would be applied to both installed flow monitor and RM data

  11. Summary of CTM-041 • A site-specific default WAF can be calculated using Section 8.4.2 of CTM-041, and either a run from the most recent flow RATA, or from a single Method 2, 2F or 2G non-RATA run. • The run used to calculate a default WAF must have same number of Method 1 traverse points as is used in the most recent flow monitor RATA

  12. Report CTM-041 Using RT 910s • Each quarter you use WAF, report 6 to 11 RT 910s • The WAF RT 910s must be reported consecutively and the sequence must be uninterrupted • If non-WAF RT 910s are required, separate them from WAF RT 910s with blank RT 910s

  13. Report CTM-041 Using RT 910s (1) Report “RECTANGULAR DUCT WAF” (2) Report width of rectangular duct at test location (3) Report depth of rectangular duct at test location (4) Report the WAF applied to flow rate data (5)Indicate WAF calculation approach, I.e., report “D” for default or “T” for tested (measured) value (6) Report the date on which WAF was first applied to flow data

  14. Report CTM-041 Using RT 910s (7) If WAF is a measured value, report date of WAF test (8) If WAF is a measured value, report the number of runs in the WAF test (9) If WAF is a measured value, report the number of Method 1 traverse points in WAF test runs (10) If WAF is a measured value, report the number of test ports at which measurements were made during WAF test runs (11) Report number of Method 1 traverse points in flow RATA test runs. This record required only if a flow RATA was done during the quarter using Method 2, 2F, or 2G, corrected for wall effects with a measured WAF.

  15. Report CTM-041 Using RT 910s • Report the RT 910s in each quarterly EDR for as long as the WAF is used. If a new WAF is determined, update the RT 910s.

  16. Reporting Example #1 • Unit 2 discharges through a rectangular stack 14 ft wide and 12.5 ft deep. A certified flow monitor is installed on the stack. A default WAF of 0.9650 is obtained using CTM-041, the WAF is first applied to the flow data on Oct 15, 2003. In this example, the following WAF information is required to be reported in RT 910 in the 4Q 2003 EDR: 9102 RECTANGULAR DUCT WAF 9102 14.0 9102 12.5 9102 0.9650 9102 D 9102 20031015

  17. Reporting Example #2 • Unit 3 has a flow monitor in a rectangular duct 10.3 ft wide and 8.9 ft deep. On Oct 15, 2003, CTM-041 is used to obtain a measured WAF. Three wall effects runs are performed with 12 Method 1 traverse points per run, measured at 4 different test ports, and an average WAF of 0.9550 is obtained. The WAF is applied to the flow data starting Oct 16, 2003. The annual flow RATA for Unit 3 is performed on Dec 10, 2003 using Method 2, with 12 Method 1 traverse points per run. The measured WAF is applied to the reference method flow rate data.

  18. Reporting Example #2 In Example #2, the following WAF information is required to be reported in RT 910 in the 4Q 2003 EDR: 9103 RECTANGULAR DUCT WAF 9103 10.3 9103 8.9 9103 0.9550 9103 T 9103 20031016 9103 20031015 9103 3 9103 12 9103 4 9103 12 [Note: This RT 910 would not be submitted every quarter]

  19. Hints Regarding Flow-to-Load • WAF may cause flow to decrease by about 5% which may cause flow-to-load test failure if the RATA on which reference Q/L is based was unadjusted for WAF. Effect is temporary and will disappear when next normal load flow RATA is done and WAF is applied to it.

  20. Hints Regarding Flow-to-Load • In interim, if the flow-to-load test is failed: • Copy your quarterly flow rate data, export it outside of DAHS, perform the flow-to-load analysis using uncorrected hourly flow rates (uncorrected flow = reported flow / WAF). If you exercise this option, report results in RT 606 and put a note in RT 910 (insert a blank RT 910 to separate this comment from the required sequence of RT 910s) indicating that WAF was removed from flow rate data before running flow-to-load ratio test. Keep results of data analysis on-site in format suitable for inspection.

  21. Hints Regarding Flow-to-Load • In RT 220, report the WAF corrected flow in columns 29 and 39 whether or not you remove WAF from flow rate data to perform flow-to-load ratio test

  22. Reporting CTM-041 Data

  23. Sources Approved to Use CTM-041

  24. For a Copy of Presentation www.epa.gov/airmarkets, click on “Recent Additions” near top left corner or John Schakenbach Phone: 202-343-9158 schakenbach.john@epa.gov

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