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Hot Dip Galvanizing Facilities

TNRCC Rule 116.111(3) in Regulation VI requires that Best
Available Control Technology (BACT) be applied to all
facilities that must obtain a permit.  BACT is defined as any
control method which is technically feasible and economically
reasonable.  BACT determinations are made on a case-by-case
basis.  The applicant is encouraged to talk with a TNRCC NSR
Permit Engineer to determine the BACT for the facility. 
Current BACT practices are:  

1.  Use of a well designed hood to capture emissions from the
    zinc kettles.
2.  All zinc kettle emissions exhausted to a filter system
    having a minimum collection efficiency of ninety-nine
3.  Use of a fume suppressant on acid pickle tanks.  

These levels are guidelines to help the applicant get an idea
of what the TNRCC is currently considering as BACT; however
these control levels are subject to change.   Part D of
section VI of the PI-1 form requires the applicant to submit
a BACT analysis.  Any BACT proposal that is different from the
requirements stated above needs to be explained in detail. 
Any control system alternative evaluated should be well
designed and engineered for its application.