mech18.txt
mech18.txt — 1.7 KB
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Office of Air Quality, Permitting & Enforcement Division Mechanical Section Policy Memorandum Date: June 2, 1995 No.: 18 From: Skip Clark, P.E. Approved by: Gary I. Wallin, P.E. Subject: S. E. No. 58: Metal Melting and Holding Furnaces Policy: The intent of Standard Exemption No. 58 (S.E. No. 58) is to allow the melting and holding of listed metals that require no additional processing prior to their use. The exemption states that specific processes used for metal conditioning or purifying are not authorized, i.e. smelting, reduction, sweating, metal separation, or distilling. In other words, to meet the conditions of S.E. No. 58, the metal received by a facility must not need further processing, other than melting or being held in a molten state. This exemption was not intended to be used for recycling purposes Background: A facility that requires the use of molten metal for manufacturing purposes will receive the quality and quantity of the metal from suppliers based on their specifications. It is the suppliers responsibility to ensure the metal meets the specification requirements. The manufacturing facility does not have to do any additional metal processing beyond melting and holding. The intent of S.E. No. 58 was to allow the melting of clean ingot, pigs, or clean recycle scrap for only those metals listed in the exemption. Recycling of scrap metals usually produces more air contaminates because of the impurities that are present, such as oil, grease, paint, rubber, plastics. S.E. No. 96 addresses recycling of aluminum and copper, and it requires an afterburner to control the air emissions from this process. Necessary Action: None cc: All Mechanical Section