AIR POLLUTION CONTROL DIVISION Field Inspection Report

COUNTY NUMBER: 123 SOURCE NUMBER: 0071 DATE: 9/22/97 COMPANY: Harsh International, Inc. INSPECTOR: Thomas Lovell

SITE LOCATION: Eaton COUNTY: Weld

CONTACT PERSON: Orvin Adolf TIME: TELEPHONE NUMBER: (970) 454-2291 AIRS UPDATE: INSPECTION: ROUTINE[ ] COMPLAINT[ ] FA[ ] STACK TEST [X] PERMIT NUMBER:

HOURS: PROTOCOL: 1.0 INSPECTION: 6.0 TRAVEL: 4 .0 REPORT: 4.0 TOTAL: 15.0

EMISSION POINTS SUBJECT TO NSPS:

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On September 22 and 23, 1997, a stack test was perf ormed at the Harsh International facility in Eaton. The units tested are the two hard chrome plating tanks at the facili ty, which exhaust to a common control device. The rectifier capacity of each tank is 6000 amps. Based upon the installed rectif ier capacity of the facility, it is a large, hard c hromium electroplating facility. There are also several other tanks on the plating l ine, used to clean the parts and prepare them for p lating. One of these tanks, an etching tank, is also hooked up to the control devi ce, a packed bed scrubber. Since this tank is cons idered an unaffected facility for the purpose of the MACT standard, the special c ompliance provisions of § 63.344 (e)(3) apply. Bas ed upon the procedures in the regulation, and the flow measured during the stack testing, the emission standard for this sour ce is 196 mg/hr. In addition to the packed bed scrubber, a wetting a gent type fume supressant is also used to control c hrome emissions.

A surface tension measurement was taken on both of the tanks during the testing. Each tank has its ow n inlet duct leading to the scrubber, so velocity measurements were necessary i n both of the duct. Also pressure drop across the scrubber was monitored during the testing. The results of the testing are summarized in the ta ble below.

Run 1 Run 2 Run 3 Average

Stack Flow (dscmm) 280 288 284 284

Chrome Emissions (mg/dscm) 0.0019 0.0011 0.0018 0.0016

Chrome Emissions (mg/hr) 31 19 31 27

Tank #5 Current (amps) 5100 4800 5300 5067

Tank #6 Current (amps) 5000 4800 5000 4933

Tank #5 Scrubber Inlet ∆ P (“H 2 O) 0.26 0.30 0.30 0.29

Tank #6 Scrubber Inlet ∆ P (“H 2 O) 0.25 0.28 0.30 0.28

Scrubber Press. Drop (“H 2 O) 1.5 1.5 1.5 1.5

The results of the testing show this source to be in compliance with the Chromium MACT standard limi t for chromium emissions of 196 mg/hr for this source. The surfac e tension measurement taken during the testing show ed the surface tension of tank #5 to be 31 dynes/cm, and the surface tension of tank #6 to be 27 dynes/cm. The source should ma intain the surface tension at or below these levels in the future. Also, the source is required to monitor the velocity in the i nlet ducts to the scrubber on a daily basis. These values should not deviate more than± 10% for either duct. Therefore the velocity pressure of the duct leading from tank #5 should stay between 0.26" and 0.32" H 2 O, and the velocity from duct #6 should stay betwee n 0.25" and 0.3" H 2 O. The pressure drop across the scrubber also needs to be monitored on a daily basis. This should not va ry more than ±1" from the value measured during the testing. Thus the pressu re drop should remain between 0.5" and 2.5" H 2 O. Any times that the values are outside of these parameters it is considered an exceedance of the standard, and records should be kept of each such

occurrence.