Fresh Air Consulting Norman L. Morrow, Ph.D. November 5, 2003 MON Heat Exchanger Requirements.
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Transcript of Fresh Air Consulting Norman L. Morrow, Ph.D. November 5, 2003 MON Heat Exchanger Requirements.
![Page 1: Fresh Air Consulting Norman L. Morrow, Ph.D. November 5, 2003 MON Heat Exchanger Requirements.](https://reader035.fdocuments.net/reader035/viewer/2022072005/56649cd55503460f9499cb31/html5/thumbnails/1.jpg)
Fresh Air ConsultingNorman L. Morrow, Ph.D.November 5, 2003
MON Heat Exchanger Requirements
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Fresh Air ConsultingNorman L. Morrow, Ph.D.November 5, 2003
What is a Heat Exchange System?
• Heat exchange system means any cooling tower system or once-through cooling water system (e.g., river or pond water). A heat exchange system can include more than one heat exchanger and can include an entire recirculating or once-through cooling system. [63.101]
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Fresh Air ConsultingNorman L. Morrow, Ph.D.November 5, 2003
What Heat Exchangersare Exempt?
• The heat exchange system operates with a minimum cooling water pressure at least 35 kPa (5.08 psi) greater than the maximum process side pressure.
• There is an intervening cooling fluid, containing <5 wt. % total HAP.
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Fresh Air ConsultingNorman L. Morrow, Ph.D.November 5, 2003
What Heat Exchangersare Exempt? (Cont’d)
• It’s a once-through system that is subject to a NPDES permit meeting specified conditions.
• It’s a once-through system used to cool fluids that contain <5 wt. % HON Table 9 HAP.
• It’s a recirculating system used to cool fluids that contain <5 wt. % HON Table 4 HAP.
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Fresh Air ConsultingNorman L. Morrow, Ph.D.November 5, 2003
Heat Exchange System Requirements
• Comply with the requirements of §63.104 of the HON.– Monitor each heat exchange system used to cool
process equipment in an MCPU using the procedures in §63.104(b) or (c).
– Whenever a leak is detected, comply with the requirements in §63.104(d).
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Fresh Air ConsultingNorman L. Morrow, Ph.D.November 5, 2003
What are the Monitoring Requirements?
• Monitor monthly for six months then quarterly.
• Monitor individual heat exchangers or groups.
• Take triplicate samples and use EPA approved methods or monitor surrogates following a monitoring plan.
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Fresh Air ConsultingNorman L. Morrow, Ph.D.November 5, 2003
What is a leak?
• Using EPA methods:– A leak is detected if the exit mean
concentration is greater than the entrance mean concentration using a one-sided statistical procedure at 0.05 level of significance and the amount by which it is greater is at least 1 ppm or 10% of the entrance mean, whichever is greater.
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Fresh Air ConsultingNorman L. Morrow, Ph.D.November 5, 2003
What is a leak?
• Using a surrogate:– The leak detection criteria is specified and
justified in the monitoring plan.
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Fresh Air ConsultingNorman L. Morrow, Ph.D.November 5, 2003
Repair Provisions
• If a leak is detected, repair as soon as practical, but not later than 45 days after receiving the monitoring results.
• Remonitoring after repair is required.
• Delay of repair is allowed under certain, limited situations.