Office of Air Quality, Permitting & Enforcement Division

               Mechanical Section Policy Memorandum

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Date:  February 10, 1994                            No.: 6 

From:  Mike Gould

Approved by:  Gary Wallin, P.E.

Subject:  Standard Exemption No. 57

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Policy:   

The storage tank(s) needed for the chemical used in
the surface conditioning of metal objects is covered under
Standard Exemption No. 57.  

Background:   

Highland Pump Company requested Standard Exemption No. 57 for
a nitriding process where they heated steel tubulars in an
electric furnace in the presence of ammonia.  This implies
there is a storage tank somewhere to keep the ammonia for the
nitriding operation.  This storage tank would be covered under
No. 57 rather than needing a separate exemption for the
storage tank.

Necessary Action:  none

cc:  All Mechanical Section